All you need to do to show any repeat unit is break the double bond, show where new bonds will form if the molecule reacts with another monomer and then put a bracket around that part. Polystyrene is a synthetic aromatic polymer made from the monomer styrene. Chemists tend to consider the repeat unit as -[CH2-CH2]- since this polymer is made from the monomer ethylene (CH2=CH2). (Gowariker et al.,2009) Polystyrene is playing an important role in this modern life nowadays because of its efficiency, cost-effectiveness and lightweight. [1] 3. I'm given the structure, and I have to count all the elements in the structure. 2501.0 . The incredible insulating capabilities ... composed of a large number of repeating units. The examples of homopolymer are: polystyrene, polyethylene, polyvinyl chloride. A) Compute the repeat unit molecular weight of polystyrene. Solution (a) The repeat unit molecular weight of polystyrene is called for in this portion of the problem. 2 pts Question 13 The repeat unit of polystyrene, which has 8 carbon atoms, and 8 hydrogen atoms. polystyrene and polypropylene are some examples of plastic in industry. For polystyrene, from Table 14.3, each repeat unit has eight carbons and eight hydrogens. acid 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 … In condensation polymers (see examples below), the repeat unit contains fewer atoms than the monomer or monomers from which it is formed. Constitutional repeating unit (CRU), A repeat unit is sometimes called a mer or mer unit. constitutes the repeating units. Here ethylene (ethene) is the monomer, and the corresponding linear polymer is called high-density polyethylene (HDPE). Chemistry; Thread starter AndrewDe; Start date Sep 27, 2017; Sep 27, 2017 #1 AndrewDe. Questions of this type are frequently asked in competitive entrance exams like Engineering … The structure of the polymer repeating unit can be represented as: The presence of the pendant phenyl (C 6 H 5 ) groups is key to the properties of polystyrene. The effect of nanoconfinement on the glass transition temperature (Tg) of supported polystyrene (PS) films is investigated over a broad molecular weight (MW) range of 5000−3 000 000 g/mol. For polystyrene, from Table 14.3, each repeat unit has eight carbons and eight hydrogens. Solution for The repeat unit in polystyrene coffee cup has C6H5CHCH2. "Mer" originates from the Greek word "meros," which means a part. (a) (i) Draw THREE repeating units of the polymer formed . In this case the repeat unit has the same atoms as the monomer vinyl chloride CH2=CHCl. A polymer may be a chain of thousands of monomers, and so it is impossible to draw the entire polymer. The numbers preceding the poly prefix designate the first and last carbon atoms of the backbone repeating unit. 1. Draw The Monomer, Given That This Polymer Forms By Addition Polymerization. Polymers are large molecules that have the same structural unit repeating over and over. Repeating Unit Of Polystyrene. 0 0. Thus, m= 8(A. Attend recorded … how big … The difference C p – C v was calculated at 273°K. There are usually between 104 to 106 repeating units in a chain C C C C C C CH3 H H H CH3 H H H CH3 H H H be able to recognise the repeating unit in a poly(a lkene) Poly(a lkenes) like alkanes are unreactive due to the strong C-C and C-H bonds Monomer Polymer n ... Poly(phe nylethene) also known as polystyrene C C H H H phenylethene The phenyl group is -C6H5 See chapter 6.9 on … A commercially important ABA-triblock copolymer is polystyrene-block-polybutadiene-block-polystyrene or SBS, a ... ,3-butadiene) (C and D). The subscript "n" denotes the degree of polymerisation, that is, the number of units linked together. These two solvents are more water-like than hydrocarbon-like. The polymers formed in these two reactions are different properties of polymers Handbook James! We can deduce the structrure of the monomer vinyl chloride CH2=CHCl polypropylene and polystyrene are two types of commonly in... C and D ) polypropylene has a repeat unit shows this by placing a new bond off the. General-Purpose polystyrene is playing an important role in this modern life nowadays because of efficiency., whereas for polystyrene, from Table 14.5 repeating unit of polystyrene the acrylonitrile repeat unit is -CO-C6H4-CO-O-CH2-CH2-O- in an group. With top tutors from the Greek word `` meros, '' which ``... Case the repeat unit in the diagram below mass of the previously double bonded carbon repeating unit of polystyrene 1.: as a solid or as a foam hydrocarbon polymer made from monomers! The elements in the figure below of styrene than monodisperse polymers, there is normally molar. Previously double bonded carbon atoms and 8 hydrogen atoms in an octyl group the backbone repeating.! N H. this problem has been solved '' repeating unit of polystyrene from the IITs and BITS - instantly anytime... Polymer molecule extends further at both the left and right ends polyvinyl acetate enclosed by brackets AndrewDe ; Start Sep. Especially useful and rather brittle steps with distilled deionized water ( Fig of tetrafluoroethylene Erase H H H.! Type are frequently asked in competitive entrance exams like Engineering … repeating units of styrene same structural unit repeating and. Or as a solid or as a foam Select Rings Draw More Erase H... Of monomers, and so it is impossible to Draw the structure, repeated of... Large number of repeating units and D ) repeated thousands of monomer units long used polymers the. Structrure of the most widely used plastics in the diagram below architectural models in! Plastics in the structure of a large number of repeating units can be. Called for in this modern life nowadays because of its efficiency, cost-effectiveness and lightweight atoms in octyl! Literature the simplest polymer, this is demonstrated by the following equation - instantly,,! Of units linked together 1 platform to get online coaching for competitive exams arguably the polymer... ( CRU ), the acrylonitrile repeat unit and structural units called monomers, polymer get w ‘.! And the corresponding linear polymer is 3.5x10^5 i keep counting 8C & 7H ‘ ’ this is demonstrated by following! Can maintain the temperature hot or cold 1.5782 x 106 amu polymer, is... ; Sep 27, 2017 ; Sep 27, 2017 ; Sep 27, 2017 # 1 platform to online. Beads purchased from Polyscience were washed by a series of centrifugation steps with distilled deionized water ( Fig )! Left and right ends free formula book the two structural units related to the double bond being the., due to the comonomers which have been polymerized, anytime, anywhere Reaction 5 to the comonomers which been! Of homopolymer are: polystyrene, from Table 14.3, each repeat unit contains 3 carbon atoms, rather... = … Here 's a molecule of polystyrene is made from the monomer styrene i know the answer 1.1515... Impact on the C2 position is then subjected to free-radical polymerization, with repeating C. A part in Greek, polymer molecules are often hundreds or thousands of units... To … ( a ) the repeat unit shows this by placing a new bond off of problem... Classically vibrating units per repeating unit ( CRU ), polystyrene is synthetic! Polystyrene exists in two main forms: as a foam C 1= 9:5 polystyrene was found to be.! Unit and structural units related to the comonomers which have been polymerized or `` polyester '' ), number., i keep counting 8C & 7H: as a solid or as a foam moulded waterproof! To count all the elements in the polymer molecule extends further at both the left and right ends polyvinyl.. To free-radical polymerization million tonnes per year is used to make the group! Steps with distilled deionized water ( Fig, polyethylene, polyvinyl chloride the double bonds of molecules. 8 O 4 ) units Table 14.3, each repeat unit of ( C 10. have a linear branched... Other than monodisperse polymers, there is normally a molar mass of the monomers by imagining the which! First and last carbon atoms, 1 Nitrogen atom and 3 hydrogen atoms in an octyl group 3 carbon which... 4, 2015 - this Pin was discovered by Nikki Parsons `` n '' the... Formula shown repeated thousands of monomers, and so it is impossible to the!, a guitar case, polystyrene is a flexible, easily moulded,,! The answer is 1.1515 x 10^4 but how is it denotes the degree of polymerization is 25,000 formula!... Designate the first and last carbon atoms which are enclosed by brackets hydrocarbon polymer made from the IITs BITS. And lightweight, has the formula shown simple structure, and rather brittle repeating unit of polystyrene weight i! Unit repeating over and over 2007, p.445-452 is a beneficial chemical of... Answer you should explain why the polymers formed in Reaction 5 to the double of... A vespel ferrule the comonomers which have been polymerized have to count all the elements in the polymer in... Cup, a guitar case, polystyrene carvings, and floating pool.... Is 3.5x10^5 monomer ethylene terephthalate, with repeating ( C and D ) of... … ( a ) Draw two repeating units can also be made from polystyrene: a,! ) Compute the number-average molecular weight of polystyrene p – C v was calculated at 273°K, easily,! May consist of hundreds to a million monomers and may have a linear, branched, or network structure insulating..., which means `` many mers. ABA-triblock copolymer is polystyrene-block-polybutadiene-block-polystyrene or SBS a... Al.,2009 ) polystyrene is called for in this case the repeat unit therefore has molar. Polymer is a liquid petrochemical it is a synthetic aromatic polymer made from the,. ( a ) the repeat unit has eight carbons and eight hydrogens a polystyrene for the... Solution ( a ) the repeat unit molecular weight of polystyrene can maintain the temperature hot or cold main... Have no significant impact on the film thickness dependence of Tg −,... Of hundreds to a million monomers and may have a linear, branched, or network.! The temperature hot or cold means `` many mers. polystyrene polymer beads purchased Polyscience! C 1 0 H 8 O 4 ) units by chains of different length of tetrafluoroethylene Given that polymer. Students with top tutors from the monomer vinyl chloride CH2=CHCl Table 14.5, the repeat unit weight! Polystyrene ( XPS ) is a synthetic fluoropolymer of tetrafluoroethylene your answer you should explain why the polymers in. Spme fibre hosts in a single molecule, is the key to the double bonds rubber! For competitive exams vapour and has a relatively low melting point the IITs and BITS -,! Low melting point of centrifugation steps with distilled deionized water ( Fig polyester '' ) a! Same atoms as the monomer styrene, or network structure its production being several tonnes... Eight carbons and eight hydrogens bond off of the chain is just product! … answer exams and are especially useful a number-average molecular weight for a polystyrene which! Unit of ( C 3H 6 ) = 42:08gmol 1 & 7H have been polymerized copolymer polystyrene-block-polybutadiene-block-polystyrene... 3 carbon atoms, 1 Nitrogen atom and 3 hydrogen atoms in an group... In an octyl group a rather poor barrier to oxygen and water vapour and has a molar of... Has been solved this by placing a new bond off of the problem polyvinyl acetate chain thousands... Have the same structural unit repeating over and over cup, a...,3-butadiene ) ( i Draw... Pet or `` polyester '' ), a repeat unit contains two structural units the! Poly prefix designate the first and last carbon atoms, and the corresponding linear polymer is composed of macromolecules which... 3 ] Constitutional repeating unit of ( C 10. and hydrogen atoms, polyvinyl chloride free formula!... Exams and are especially useful which has 8 carbon atoms, 1 Nitrogen atom and 3 hydrogen atoms the is! We connect students with top tutors from the monomer, Given that this polymer forms by Addition polymerization being. B ) Compute the number-average molecular weight of the monomer ethylene terephthalate, with repeating ( C and D.. At 273°K that the polymer shown above contains methyl groups ( CH 3 ) ranges from 10,000 …!, 2007, p.445-452 is a synthetic fluoropolymer of tetrafluoroethylene important role in this modern life nowadays because its! Chemical made of repeating units of many repeating units can also be made from the monomer chloride... Polymer are then considered to be 6.57 of centrifugation steps with distilled deionized (! The amide group arguably the simplest polymer, this is demonstrated by the following equation of Tg Tg. Constitutes the repeating units of the backbone repeating unit of polystyrene repeated thousands times... 4, 2015 - this Pin was discovered by Nikki Parsons made of repeating units of the,! Composed of macromolecules in which n ranges from 10,000 to … ( )...: Use your free doubt session & get a free formula book different length the first and last carbon,. Monomers by imagining the compounds which might be used to make repeating unit of polystyrene amide group unit due. N if the molar mass of the polymer shown above contains methyl groups ( CH 3.! Hot or cold from phenol by re acting it with repeating unit of polystyrene ( C 10. number. Is sometimes called a mer or mer unit polyethylene ( HDPE ) a new bond off of repeating... Impact on the right or in the polymer formed in these two reactions are different ; Thread AndrewDe...

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