Transcribed Image Text 2 pts Question 13 The repeat unit of polystyrene, which has 8 carbon atoms, and 8 hydrogen atoms. Show transcribed image text . The repeating units are called monomers. A polymer can be a 3-dimensional (3D) network Imagine of a repeating unit joined together left and right, back and front, up and down or it is a 2-dimensional (2D) network Imagine of the repeating units linked together right, left, down, and up in a sheet or a 1-dimensional (1D) network Imagine of a repeating unit … Source(s): https://owly.im/a8y7V. 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. 3. Get answers by asking now. (a) Draw the structure of the repeating unit in the superglue polymer. Polystyrene exists in two main forms: as a solid or as a foam. Hydrogen is an explosive gas, oxygen supports combustion, why, when adding 2 hydrogen atoms to 1 oxygen atom, is the result an inert liquid? 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. 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. Include All H Atoms. constitutes the repeating units. Source(s): https://owly.im/a8y7V. A collection of products made from polystyrene: a cup, a guitar case, polystyrene carvings, and floating pool noodles. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. Out of the total production of styrene, about 50% is used to produce polystyrene, about 20% to elastomers, polymer dispersions and thermosetting resins, 15% to produce ABS and SAN copolymers, 10% in expanded polystyrene (EPS), and the rest is for the production of various copolymers and specialty materials. The difference C p – C v was calculated at 273°K. The brackets contain the repeating unit. (Gowariker et al.,2009) Polystyrene is playing an important role in this modern life nowadays because of its efficiency, cost-effectiveness and lightweight. Polystyrene is made from the monomer styrene which is a liquid petrochemical. HashLearn is India's first on-demand tutoring app. [3] The examples of homopolymer are: polystyrene, polyethylene, polyvinyl chloride. To calculate the weight, I keep counting 8C & 7H. Introduction. What is the value of n if the molecular mass of a single polymer chain is 1.5782 x 106 amu? 552450.0 g/mol. The SPME fibre hosts in a Valco-tee unit sealed by a vespel ferrule. Addition polymerization of an alkene. We serve Class 8th - 12th students preparing for CBSE, ICSE and State boards as well as all entrance exams such as IIT JEE Main & Advanced, BITSAT, NEET, VITEEE, MU OET, SRMEEE, AIPMT and all State entrance exams. (a) (i) Draw THREE repeating units of the polymer formed . Join Yahoo Answers and get 100 points today. The average number of mer-units in a chain. Thus, m = 8(AC) + 8(AH) = … (b) A simplified representation of polyvinyl acetate. If the molar mass of the polymer is 3.0 × 105 g/mol, what is the degree of The two repeat units in this co-polymer are acrylonitrile and butadiene. The word polymer derives its meaning from this, which means "many mers." ... (polyvinyl chloride), styrene (phenylethylene, polystyrene), methyl methacrylate (Plexiglas), and acrylonitrile (cyanoethylene, acrylic fibers). The polymer is formed by the condensation reaction of the two monomers terephthalic acid (HOOC-C6H4-COOH) and ethylene glycol (HO-CH2-CH2-OH), or their chemical derivatives. A single molecule of polystryene has the repeating unit -[CH2CH(C6H5)]n-, where n is the number of repeating units. The molecular mass of the repeat unit, MR, is simply the sum of the atomic masses of the atoms within the repeat unit. The repeat unit is highlighted in blue. Polystyrene MW is shown to have no significant impact on the film thickness dependence of Tg − Tg,bulk. Solution for The repeat unit in polystyrene coffee cup has C6H5CHCH2. your own Pins on Pinterest For example, polystyrene chains may be grafted onto polybutadiene, a synthetic rubber which retains one reactive C=C double bond per repeat unit. It is a rather poor barrier to oxygen and water vapour and has a relatively low melting point. It is a flexible, easily moulded, waterproof, 1,2-poly(1,3-butadiene) has a vinyl-type structure, where the substituent group (ethene) contains an unsaturated … A commercially important ABA-triblock copolymer is polystyrene-block-polybutadiene-block-polystyrene or SBS, a thermoplastic elastomer (see Section 9.2.3). Answer with step by step detailed solutions to question from Arihant's BITSAT Prep Guide, Polymers- "Repeating unit of polystyrene is" plus 6299 more questions from Chemistry. Thus, m = 8(A C) + 8(A H) = (8)(12.01 g/mol) + (8)(1.008 g/mol) = 104.14 g/mol (b) We are now asked to compute the number-average molecular weight. Discover (and save!) What is the value of n if the molecular mass of a single polymer chain is 1.5782 10 6 A) 1.217 10 8 units. 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. 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