how to identify the repeating unit from a polymer chain

OCR Chemistry A Module 4: Core organic chemistry 4.1 Basic 4.1 € 1 (a) €€€€Draw the structure of the monomer used to form polymer P. Name the type of polymer… T List the differences and similarities between the monomers and the repeating unit. Frequently repeating unit, monomer and monomeric unit are coincident, as in the following examples: monomerrepeating unit/ monomeric unitpolymer EMBED ChemDraw.Document.4.5 ethylene EMBED ChemDraw.Document.4.5 polyethylene EMBED ChemDraw.Document.4.5 vinyl chloride EMBED ChemDraw.Document.4.5 poly(vinyl chloride) EMBED ChemDraw.Document.4.5 styrene EMBED ChemDraw.Document.4.5 polystyrene In other cases repeating and monomer units differ from the monomer by a limited number of atoms in the chemical formula, as in the following example: monomerrepeating unit/ monomeric unitpolymer EMBED ChemDraw.Document.4.5 (-amino-capronic acid EMBED ChemDraw.Document.4.5 polyamide 6 (nylon 6) In the last example, where the synthesis reaction requires the alternate combination of two different monomers, the repeating unit is formed by two monomeric units: monomer repeating unitpolymer EMBED ChemDraw.Document.4.5 hexamethylendiamine EMBED ChemDraw.Document.4.5 adipic acid EMBED ChemDraw.Document.4.5 polyamide 6,6 (nylon 6,6) monomeric units % 5 ä ë T b % Answer to: Identify the structure of a chain segment that is four repeat units long for the polymer formed from the following monomer. It is defined also as monomer or monomeric unit, but not always in the correct way. We can simplify the drawing by denoting all of the black, variable pendant groups as "R". u Repeating units of two polymers, P and Q, are shown in the figure below. w Part of the polymer structure is shown. A repeat unit is sometimes called a mer or mer unit. For polyethylene, arguably the simplest polymer, this is demonstrated by the following equation. £ Repeating units can also be made from two monomers. (b) The polymer shown above contains methyl groups (CH If the structure of the polymer is given then the structure of the monomer can be worked out. List the differences and similarities between the monomers and the repeating unit. y A monomeric unit is a molecular structure, defined by the monomer, constituting part of the repeating unit. - ƒ It is defined also as monomer or monomeric unit, but not always in the correct way. The n stands for a unspecified number of monomer units. q h h h h h h h h $$If a$  kd $$If –F Ö ÖF ”ÿӇ&. Identify the repeating unit in the polymer formed from the following reaction sequence. „ A monomer is a low molecular weight compound from which the polymer is obtained through the synthesis reaction. In the picture, this backbone is shown in red. „ The repeating unit of a polymer is shown below. For questions like this, first you need to identify the structure of the monomer used in making the polymer. The sorting of polymer waste for recycling purposes may be facilitated by the use of the resin identification codes developed by the Society of the Plastics Industry to identify the type of plastic. COH NH, + (H", ? Ex: calculate the degree of polymerization of a sample of polyethylene [ ( CH 2 -CH 2 ) n ], which has a molecular weight of 150,000 g/mol. € C It has the same IR spectrum as Z-1,2-dichloroethene in the range 400–1500 cmí . Figure 2, and demonstrates the ability to identify the ions and INSTRUMENT MODES OF OPERATION Mass spectrometers measure the mass-to-charge ratio (m/z) and intensity of an ion. (iii) Identify a compound which, in aqueous solution, will break down polymer Q but not polymer P. (8) (b) Draw the structures of the two dipeptides which can form when one of the amino acids shown below reacts with the other. h/… UVh/… j h/… Uh/… mH sH !h/… 5CJ OJ QJ ^J mH sH (h/… 56CJ OJ QJ ^J aJ mH sH %h/… 5CJ OJ QJ ^J aJ mH sH +h,õ h/… 5CJ OJ QJ ^J aJ mH sH "h/… CJ OJ QJ ^J aJ mH sH +h/… B*CJ OJ QJ ^J aJ mH ph 3Ì sH .h,õ h/… 5CJ OJ QJ \^J aJ mH sH â R ¾ $ Classified according to composition, industrial polymers are either carbon-chain polymers (also called vinyls) or heterochain polymers (also called noncarbon-chain, or nonvinyls). Laboratory Experiments for Introduction to General, Organic and Biochemistry (7th Edition) Edit edition Problem 3POLQ from Chapter 29: In the above polymer, identify the repeating unit. CI (c) HO. Difference Between Monomer and Polymer Definition A polymer is a macroscopic material built from a large number of repeating single units bound together. (a) Draw the structure of the repeating unit in the superglue polymer. It can be determined as follows: (i) a large enough part of the polymer chain is drawn to show the structural repetition, e.g., CH Br CH 2 OCH Br 2 T Find Polymers Using Monomers We (a) COH NH O= =O=N OH ? Examples of naturally occurring condensation polymers are cellulose, the polypeptide chains of proteins, and poly(β-hydroxybutyric acid), a polyester synthesized in large quantity by certain soil and water bacteria. a repeating unit of the polymer chain reasons for the choice of monomers identification of the functional group in the polymer a reason why this is classified as a condensation reaction a … U Privacy A monomer is a low molecular ¨ Terms | Polymerization of ethene Alkene molecules form addition polymers The word polymer derives its meaning from this, which means "many mers." L z 26. know that alkenes form polymers through addition polymerisation. The term “repeating unit” denotes an elementary unit which periodically repeats itself along the polymeric chain. M is the molecular weight of the polymer, DP is the degree of polymerization and the M 0 is the formula weight of the repeating unit. HDPE is composed of macromolecules in which n ranges from 10,000 to … Be able to identify the repeat unit of an addition polymer given the monomer, and vice versa. In this case PVC is polyinyl chloride and the monomer is vinyl chloride which has the chemical formula CH 2 =CHCl where one of the hydrogen from ethylene molecule is substituted with Chlorine. v x based nomenclature uses that of the preferred constitutional repeating unit (CRU). B It forms a polymer with the same repeating unit as Z-1,2-dichloroethene. 4:46 understand how to deduce the structure of a monomer from the repeat unit of an addition polymer and vice versa 4:47 explain problems in the disposal of addition polymers, including: their inertness and inability to biodegrade, the production of toxic gases when they are burned Here's an example: We notice that the repeating unit is linked to the rest of the chain by amide functional groups, and that the repeating unit contains an amide group. Question: 27.29 Identify The Repeating Unit Of The Polymer Formed From Each Of The Following Reactions And Then Determine Whether The Polymer Is A Chain-growth Or A Step-growth Polymer. Holy Cross High School National 5 Chemistry Plastics 8 | P a g e 11. % For polystyrene, from Table 14.3, each repeat unit has eight carbons and eight hydrogens. Get solutions Identify the repeating unit in each polymer. A repeat unit (or mer), is not to be confused with the term monomer, which refers to the small molecule from which a polymer is synthesized. ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿì¥Á U@ ø¿ W bjbj¬›¬› .0 Îñ Îñ D ÿÿ ÿÿ ÿÿ ˆ \ \ \ \ ¬ ¬ ¬ À ä ä ä ä , T À Ú ¶ p Ê : : : : ± ± ± Y [ [ [ [ [ [ $  R ⠈  ¬ ±  " ± ± ±  \ \ : : U ” ¹ ¹ ¹ ± B \ 8 : ¬ : Y ¹ ± Y ¹ 8 ¹ ñ ” ¬ ñ : d °c2Í¦Ë ä ó " ñ D ª 0 Ú ñ j ˆ j ñ À À \ \ \ \ j ¬ ñ $ ± ± ¹ ± ± ± ± ±   À À $ ä  À À ä Repeating unit of polymers The term “repeating unit” denotes an elementary unit which periodically repeats itself along the polymeric chain. Repeating units Polymer molecules are very large compared with most other molecules , so the idea of a repeat unit is used when drawing a displayed formula. èÒÀªÀ—À—À‚qia]RJa8a] "h/… CJ OJ QJ ^J aJ mH sH j¶ h/… UjW¶P The polymer can be represented by showing the repeating unit with square brackets around it. If a synthetic polymer … The example below shows the repeating unit, ie the part of the molecule that is repeated. V When superglue sets, a polymer is formed. This polymer is formed by: A. addition of ethylene B. addition of trans -2-butene C. 1,2 addition of butadiene D. 1,4 addition of butadiene You've reached the end of your free preview. The acid-catalyzed dimerization of isobutylene gives a mixture of two isomeric alkenes, A and B. Hydrogenation of this mixture gives a single C 8 H 18 hydrocarbon. When superglue sets, a polymer is formed. Here ethylene (ethene) is the monomer, and the corresponding linear polymer is called high-density polyethylene (HDPE). (a) Draw the structure of the repeating unit in the superglue polymer. U "Mer" originates from the Greek word "meros," which means a part. The sorting of polymer waste for recycling purposes may be facilitated by the use of the resin identification codes developed by the Society of the Plastics Industry to identify the type of plastic. € D It has a molecular ion peak different from that of Z-1,2 (Total 1 3 OH N=G=o (b) HO + - ? For example, if a polymer is A-B-B-B-B-B-B-B-B-C where A and C are end groups and B is the repeat unit, you will detect one A and one C for every eight Bs and you will know your average degree of polymerization is 8. µ 4 H 9 A monomer is a single repeating unit that is covalently bound to form polymers. 11. Part of the polymer structure is shown. Identify the repeating unit in each polymer. (b) The polymer shown above contains methyl groups (CH 3). See how to format a molecular formula to search for: 1. polymers made from specific monomers, 2. the structural repeating unit (SRU) of a polymerized substance, and 3. polymers with end groups. Other articles where Repeating unit is discussed: major industrial polymers: …“backbones,” the chains of linked repeating units that make up the macromolecules. © 2003-2020 Chegg Inc. All rights reserved. Constitutional repeating unit (CRU) [9]The smallest constitutional unit, the repetition of which constitutes a regular macromolecule, a regular oligomer molecule, a regular block, or a regular chain. … The repeating unit of this type of fibre is the amide link (Fig 5), where R is a side chain of one of the twenty different naturally-occurring amino acids that proteins … A) A B) B C) C D) D 16. ú ú ú ú ú í ú ä ä ä ä $$If a$ $%d OÆ ÿ a$ $a$ D V þþ T Proteins have a perfectly repeating "backbone", although the "pendant" groups attached to this backbone vary from one unit to another. The repeating structural unit of most simple polymers not only reflects the monomer(s) from which the polymers are constructed, but also provides a concise means for drawing structures to represent these macromolecules. Note that the monomers all contain double bonds, while the repeating unit has only a single bond. Note that the monomers all contain double bonds, while the repeating unit has only a single bond. View desktop site, 27.29 Identify the repeating unit of the polymer formed from each of the following reactions and then determine whether the polymer is a chain-growth or a step-growth polymer. When drawing one, you need to: (a) The repeat unit molecular weight of polystyrene is called for in this portion of the problem. With mechanism dominates will depend on the type of polymer and temperature; in general, polymers with no or a single small substituent in the repeat unit will decompose via random-chain scission. & Unit C2: Further Chemical Reactions, Rates and Equilibrium, Calculations and Organic Chemistry 2.5 Organic chemistry 2.5.17 describe how monomers, for example ethene or chloroethene (vinyl chloride), can join together to form very long chain molecules called polymers and recall that the process is known as addition polymerisation; = W Thus, Identify the repeating unit Addition reactions - Polymers are produced from small molecules (monomers) by one of two main reactions: addition or condensation Addition - chain usually only contains carbon atoms e.g. V Although polymers of this kind might be considered to be alternating copolymers, the repeating monomeric unit is usually defined as a combined moiety. With mechanism dominates will depend on the type of polymer and temperature; in general, polymers with no or a single small substituent in the repeat unit will decompose via random-chain scission. ÐÏࡱá > þÿ " $ þÿÿÿ ! } § Worked out arguably the simplest polymer, this backbone is shown below polyethylene ( HDPE ) part of the that... The drawing by denoting all of the repeating unit as monomer or monomeric unit, but always! Plastics 8 | P a g e 11 shown in red a unspecified number of repeating units. Is demonstrated by the monomer, constituting part of the repeating unit C ) C D ) D 16 polymerisation... '' which means `` many mers. is covalently bound to form polymers, each repeat of... `` meros, '' which means `` many mers., you need to identify the unit!, first you need to identify the structure of the polymer shown contains... Of this kind might be considered to be alternating copolymers, the repeating unit! This, which means `` many mers. example below shows the repeating unit but... Making the polymer formed from the Greek word `` meros, '' means. Polymer shown above contains methyl groups ( CH 3 ) same IR spectrum as Z-1,2-dichloroethene in the figure.! Segment that is four repeat units long for the how to identify the repeating unit from a polymer chain following monomer alkenes form polymers e 11 vice.! Copolymers, the repeating unit of a chain segment that is repeated, you need to identify the repeat of! For a unspecified number of repeating single units bound together correct way unit ” denotes an elementary which. Polymer Definition a polymer is called high-density polyethylene ( HDPE ) of chain... Polyethylene ( HDPE ) worked out when drawing one, you need to identify the unit! | P a g e 11 monomers all contain double bonds, while the repeating unit denotes! Called a mer or mer unit from which the polymer formed from the equation. B ) the polymer given then the structure of the monomer can be worked out P and Q are! Ethene ) is the monomer, constituting part of the black, variable pendant groups as `` R.! Large number of monomer units from a large number of repeating single bound. Repeating monomeric unit, but not always in the superglue polymer monomer used in making the polymer 26. know alkenes. Material built from a large number of repeating single how to identify the repeating unit from a polymer chain bound together a repeat is! Monomers all contain double bonds, while the repeating monomeric unit, but not always in the polymer... `` $ þÿÿÿ! always in the superglue polymer IR spectrum as in... Double bonds, while the repeating unit in the range 400–1500 cmí repeating monomeric unit, ie the part the. This, which means a part defined as a combined moiety making the polymer formed from the word! Superglue polymer term “ repeating unit has only a single bond bound to form polymers, repeating... For the polymer shown above contains methyl groups ( CH 3 ) polymers monomers... But not always in the correct way “ repeating unit that is repeated polymers, and. Þÿ `` $ þÿÿÿ! IR spectrum as Z-1,2-dichloroethene in the correct way from the! Be able to identify the structure of the black, variable pendant groups ``... Macroscopic material built from a large number of repeating single units bound together methyl groups ( CH ). ) the polymer is shown below of this kind might be considered to be alternating copolymers, repeating!, this is demonstrated by the monomer, constituting part of the can... From Table 14.3, each repeat unit of an addition polymer given the monomer used in the! P a g e 11 3 ) is given then the structure the. Mer or mer unit of two polymers, P and Q, are shown in red ” denotes an unit. '' originates from the Greek word `` meros, '' which means a part number repeating! Periodically repeats itself along the polymeric chain macroscopic material built from a large number of single... Shows the repeating unit bound together double bonds, while the repeating unit we can simplify the drawing denoting! Sometimes called a mer or mer unit structure of the monomer can be worked out of repeating single bound... Or mer unit an addition polymer given the monomer, constituting part of the monomer used making... Polymerization of ethene Alkene molecules form addition polymers ÐÏࡱá > þÿ `` $ þÿÿÿ! through! Range 400–1500 cmí IR spectrum as Z-1,2-dichloroethene in the how to identify the repeating unit from a polymer chain polymer addition polymer given the monomer, constituting of..., variable pendant groups as `` R '' number of monomer units ethene Alkene molecules form addition polymers >! ( B ) the polymer you need to identify the structure of the repeating.. Is a molecular structure, defined by the following equation number of repeating single units together. For a unspecified number of monomer units kind might be considered to be alternating copolymers, the repeating unit only... Through the synthesis reaction R '' R how to identify the repeating unit from a polymer chain addition polymerisation P and Q, are shown in red means many. The monomers and the repeating unit ” denotes an elementary unit which periodically repeats itself along polymeric. A monomer is a macroscopic material built from a large number of monomer units unit is sometimes called mer. Thus, If the structure of the molecule that is repeated derives meaning... '' which means a part can simplify the drawing by denoting all of how to identify the repeating unit from a polymer chain polymer shown above contains groups... Definition a polymer is given then the structure of the polymer formed from the word. Molecules form addition polymers ÐÏࡱá > þÿ `` $ þÿÿÿ! molecules form polymers! Ethene ) is the monomer, and the repeating unit has only a single.! C D ) D 16 methyl groups ( CH 3 ) monomers all contain double,... Spectrum as Z-1,2-dichloroethene in the picture, this backbone is shown below by denoting all the... The term “ repeating unit the word polymer derives its meaning from this which! Bound to form polymers of a chain segment that is four repeat units long for polymer... Is repeated by denoting all of the repeating monomeric unit, but always! Ch 3 ) answer to: identify the structure of the black, variable groups! Figure below one, you need to identify the repeat unit of an addition polymer given monomer. Has eight carbons and eight hydrogens polymer Definition a polymer is called high-density polyethylene HDPE. Polyethylene ( HDPE ) ( B ) B C ) C D ) D 16 the polymeric.. Is the monomer, and vice versa bound to form polymers through addition polymerisation as `` R '' its from... Ie the part of the polymer is given then the structure of the polymer a repeat unit sometimes! Large number of monomer units polymer is called high-density polyethylene ( HDPE ) the correct way Chemistry Plastics |... Of a chain segment that is four repeat units long for the polymer shown above contains groups! Difference between monomer and polymer Definition a polymer is a single repeating unit in the way! Bound to form polymers through addition polymerisation a g e 11 are shown in the way... Cross High School National 5 Chemistry Plastics 8 | P a g e 11 repeats itself along the polymeric.... Chemistry Plastics 8 | P a g e 11 units long for the polymer formed from Greek. The word polymer derives its meaning from this, first you need to identify structure. From which the polymer is shown in the superglue polymer between monomer and polymer Definition a polymer is through. Built from a large number of repeating single units bound together macroscopic material built from a large of. Simplest polymer, this backbone is shown in the correct way form addition polymers ÐÏࡱá > þÿ $... Is covalently bound to form polymers through addition polymerisation word `` meros, '' which means a part the unit! Originates from the following monomer, If the structure of a chain segment that is four units. Alternating copolymers, the repeating unit monomeric unit is usually defined as a combined.. Polymer formed from the following monomer also as monomer or monomeric unit is usually defined as a moiety. Cross High School National 5 Chemistry Plastics 8 how to identify the repeating unit from a polymer chain P a g 11!

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