Expanded polystyrene (EPS) is made from small spheres of polystyrene (from crude oil) containing an expansion agent (e.g., pentane C 6 H 12) that expand by heating with water vapor.The expanding spheres are bound together at their contact areas. Solution for The repeat unit in a polystyrene coffee cup has the formula C₆H₅CHCH₂. If the molar mass of the polymer is 3.0 × 105 g/mol, what is the degree of polymerization? 1= 5:9, whereas for polystyrene C 1= 9:5. have noted that the mechanical properties of polystyrene have been enhanced by embedding single-walled carbon nanotubes with repeat unit arrangements . The styrene repeat unit contains 8 Carbon atoms and 8 Hydrogen atoms. Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. Given that the atomic weight of carbon and hydrogen is 12.01 g/mol and 1.008 g/mol respectively, and that the degree of polymerization (DP) is 26000, calculate its average number molecular weight M, (Select the closest answer) Hint: Refer to Lecture 22, Slide 23 and 24. 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. Thus, the molecular weight of the styrene repeat unit is: m s = 8(A C) + 8(A H) = 8(12.01 g/mol) + 8(1.008 g/mol) = 104.14 g/mol Let f b be the chain fraction of butadiene repeat units. 104.4 g/mol. Linear Formula [CH 2 CH(C 6 H 5)] n. MDL number MFCD00084450. 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. Most synthetic fibers are condensation polymers. For the peak at m/z = 1934.083, it can easily calculate that the peak is a PS with 17 repeat styrene units (mass = 1769.071 Da). The small n means that there are many of them. Polystyrene. Compute the repeat unit molecular weight of polystyrene. A repeat unit or repeating unit is a part of a polymer whose repetition would produce the complete polymer chain (except for the end-groups) by linking the repeat units together successively along the chain, like the beads of a necklace.. A repeat unit is sometimes called a mer or mer unit. A block copolymer is defined as a polymer comprising molecules in which there is a linear arrangement of blocks, a block being defined as a portion of a polymer molecule in which the monomeric units have at least one constitutional or configurational … 331651 - Polystyrene EMAIL THIS PAGE TO A FRIEND. The polymerisation of a styrene monomer to form a polystyrene polymer. The repeat unit is highlighted in blue. The repeat unit in a polystyrene coffee cup has the formula \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHCH}_{2} . 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. The polymer is still called polystyrene. 2 pts Question 13 The repeat unit of polystyrene, which has 8 carbon atoms, and 8 hydrogen atoms. If the molar mass of the polymer is 1.9x10^5 g/mol, what is the degree of polymerization? Compute the degree of polymerization. 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 5.3, each repeat unit has eight carbons and eight hydrogens. d) Polypropylene has a repeat unit of (C 3H 6). The repeat unit in a polystyrene coffee cup has the formula C6H5CHCH2. Moles of polystyrene MWpolystyrene = 9 H atoms × 1 g/mol + 8 C atoms × 12 g/mol = 105 g/mol No. Enter in scientific notation. PubChem Substance ID … The effect of nanoconfinement on the glass transition temperature (T g) of supported polystyrene (PS) films is investigated over a broad molecular weight (MW) range of 5000-3 000 000 g/mol. Bjørn Petter Jelle, in Start-Up Creation, 2016. Linear Formula [CH 2 CH(C 6 H 5)] X [CH 2 CH=C(CH 3)CH 2] Y [CH 2 CH(C 6 H 5)] z. MDL number MFCD00217755. Ayyagari et al. of moles of polystyrene in 100 g of copolymer = 45 g 0.429 mol 105 g/mol = Thus, the total number of moles is 0.472 + 0.556 + 0.429 = 1.457 mol. The repeat unit is highlighted in blue. Compute the degree of polymerization for a polystyrene (PS) polymer with a number-average molecular weight of 260150 g/mol. If the molar mass of the polymer is 3.5 \times 10… "Mer" originates from the Greek word "meros," which means a part. . Compute the molecular weight of a singe (1), polystyrene (PS) repeat unit. (b) A simplified representation of polyvinyl acetate. Polystyrene. The repeat unit in a polystyrene coffee cup has the formula C6H5CHCH2.? One repeat unit therefore has a molar mass of M(C 3H 6) = 42:08gmol 1. Polystyrene has a chain where the substituent R is a phenyl group (C 6 H 5 ), corresponding to a benzene ring minus one hydrogen: -[CH 2 -CH(C 6 H 5 )] n -, so the repeat unit is -[CH 2 -CH(C 6 H 5 )]-. Lie et al. “repeating unit” ... 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: monomer repeating unit/ monomeric unit polymer (-amino-capronic. : repeat unit 구조및chemistry에의존 예) C=C (이중결합) 및C≡C (삼중결합): 회전운동못함(rigid) bulky side group (부피큰곁가지화학기): 회전운동제약 Lie et al. (b) A simplified representation of polyvinyl acetate. Compute the repeat unit molecular weight of polystyrene. have explored the solubility of di erent gasses in polystyrene over a wide range of temperatures and pressures [25]. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. A collection of products made from polystyrene: a cup, a guitar case, polystyrene carvings, and floating pool noodles. The difference of 165.012 mass units (1934.083 … We can deduce the structrure of the monomers by imagining the compounds which might be used to make the amide group. % Synonym: Polystyrene-block-polyisoprene, multi-arm CAS Number 25038-32-8. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 23000. Ayyagari et al. Thus, m = 8(A C) + 8(A H) The brackets contain the repeat unit. If the molar mass of the polymer is 3.5 X10⁵ g/mol, what is the degree of… The repeating unit inside the square brackets obviously has the same molecular weight of the monomer's molecule. Polystyrene prepared by free-radical polymerization is ... Polyesters are condensation polymers, which contain fewer atoms within the polymer repeat unit than the reactants because of the formation of byproducts, such as H 2 O or NH 3, during the polymerization reaction. Polystyrene is made from the monomer styrene which is a liquid petrochemical. ‘a polystyrene cup’ ‘The polymer polystyrene contains the phenyl group as part of its repeat unit.’ ‘The process uses a polymer formed through a chemical bonding of polystyrene and polymethyl methacrylate.’ ‘All polystyrene and polyurethanes are combustible regardless of grade.’ A collection of products made from polystyrene: a cup, a guitar case, polystyrene carvings, and floating pool noodles. Physical Properties of Polymers Handbook, James E. Mark, 2007, p.445-452 is a good refer-ence. NACRES NA.23 . Solution (a) The repeat unit molecular weight of polystyrene is called for in this portion of the problem. Polystyrene MW is shown to have no significant impact on the film thickness dependence of Tg − Tg,bulk. The polymer dynamics of homogeneous C60–polystyrene mixtures in the molten state are studied via molecular simulations using two interconnected levels of representation for polystyrene nanocomposites: (a) A coarse-grained representation, in which each polystyrene repeat unit is mapped into a single “superatom” and each fullerene is viewed as a spherical shell. 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. 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