polystyrene repeat unit

A polymer is often written in the form shown below. A collection of products made from polystyrene: a cup, a guitar case, polystyrene carvings, and floating pool noodles. 14.4 (a) Compute the repeat unit molecular weight of polystyrene. (b) A simplified representation of polyvinyl acetate. 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 )]-. have noted that the mechanical properties of polystyrene have been enhanced by embedding single-walled carbon nanotubes with repeat unit arrangements [26]. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 23000. 8.3.2 Expanded polystyrene. % Synonym: Polystyrene-block-polyisoprene, multi-arm CAS Number 25038-32-8. d) Polypropylene has a repeat unit of (C 3H 6). Since we are interested in … 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. View Answer The number-average molecular weight of a polypropylene is 1,000,000 g/mol. 1= 5:9, whereas for polystyrene C 1= 9:5. 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. The brackets contain the repeat unit. The repeat unit is repeated over and over again many times to make up the long chain of the polymer. If the molar mass of the polymer is 3.5 X10⁵ g/mol, what is the degree of… The repeat unit is highlighted in blue. The polymer is still called polystyrene. Ayyagari et al. Lie et al. Solid polystyrene is transparent, owing to these large, ring-shaped molecular groups, which prevent the polymer chains from packing into close, crystalline arrangements. 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. The repeating mass unit of 104.063 confirms that the analyte is a styrene-based polymer. Physical Properties of Polymers Handbook, James E. Mark, 2007, p.445-452 is a good refer-ence. A collection of products made from polystyrene: a cup, a guitar case, polystyrene carvings, and floating pool noodles. 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. “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. One repeat unit therefore has a molar mass of M(C 3H 6) = 42:08gmol 1. Compute the repeat unit molecular weight of polystyrene. The repeat unit in a polystyrene coffee cup has the formula C6H5CHCH2.? Compute the repeat unit molecular weight of polystyrene. The repeat unit in a polystyrene coffee cup has the formula \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHCH}_{2} . 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. Thus, m = 8(A C) + 8(A H) (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. The repeat unit is highlighted in blue. The small n means that there are many of them. 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). 104.4 g/mol. Compute the molecular weight of a singe (1), polystyrene (PS) repeat unit. 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. Ayyagari et al. Polystyrene-block-polyisoprene-block-polystyrene styrene 22 wt. The repeat unit in a polystyrene coffee cup has the formula C6H5CHCH2. The difference of 165.012 mass units (1934.083 … Solution (a) The repeat unit molecular weight of polystyrene is called for in this portion of the problem. NACRES NA.23 . have explored the solubility of di erent gasses in polystyrene over a wide range of temperatures and pressures [25]. Most synthetic fibers are condensation polymers. Polystyrene. Polystyrene is made from the monomer styrene which is a liquid petrochemical. 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. 2501.0. On the basis of the structures presented in this chapter, sketch repeat unit structures for the following polymers: (a) Polychlorotrifluoroethylene, And (b) Poly (vinyl alcohol). 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 MW is shown to have no significant impact on the film thickness dependence of Tg − Tg,bulk. Compute the degree of polymerization. ‘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.’ Bjørn Petter Jelle, in Start-Up Creation, 2016. Solution for The repeat unit in a polystyrene coffee cup has the formula C₆H₅CHCH₂. have noted that the mechanical properties of polystyrene have been enhanced by embedding single-walled carbon nanotubes with repeat unit arrangements . Enter in scientific notation. 331651 - Polystyrene EMAIL THIS PAGE TO A FRIEND. To Email: From Email: Message: 331651 Sigma-Aldrich Polystyrene average M w 35,000 Synonym: PS CAS Number 9003-53-6. Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. Compute the degree of polymerization for a polystyrene (PS) polymer with a number-average molecular weight of 260150 g/mol. 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. We can deduce the structrure of the monomers by imagining the compounds which might be used to make the amide group. Since there are only two repeat unit types 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. Block Copolymer. "Mer" originates from the Greek word "meros," which means a part. PubChem Substance ID 24859987. 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. Moles of polystyrene MWpolystyrene = 9 H atoms × 1 g/mol + 8 C atoms × 12 g/mol = 105 g/mol No. : repeat unit 구조및chemistry에의존 예) C=C (이중결합) 및C≡C (삼중결합): 회전운동못함(rigid) bulky side group (부피큰곁가지화학기): 회전운동제약 The repeat unit is highlighted in blue. Linear Formula [CH 2 CH(C 6 H 5)] n. MDL number MFCD00084450. ‘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.’ Solution (a) The repeat unit molecular weight of polystyrene is called for in this portion of the problem. . 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 … What is the Repeat Unit? For polystyrene, from Table 5.3, each repeat unit has eight carbons and eight hydrogens. Polystyrene. If the molar mass of the polymer is 1.9x10^5 g/mol, what is the degree of polymerization? (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 26,000. 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. 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. If the molar mass of the polymer is 3.5 \times 10… (b) A simplified representation of polyvinyl acetate. Lie et al. 2 pts Question 13 The repeat unit of polystyrene, which has 8 carbon atoms, and 8 hydrogen atoms. The styrene repeat unit contains 8 Carbon atoms and 8 Hydrogen atoms. 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. PubChem Substance ID … The repeating unit inside the square brackets obviously has the same molecular weight of the monomer's molecule. The polymerisation of a styrene monomer to form a polystyrene polymer. If the molar mass of the polymer is 3.0 × 105 g/mol, what is the degree of polymerization? Mass of the problem to form a polystyrene coffee cup has the C₆H₅CHCH₂... The amide group a repeat unit of ( C 3H 6 ) `` Mer '' originates the! B ) Compute the repeat unit molecular weight of 260150 g/mol hydrogen atoms repeated over and over again times... By imagining the compounds which might be used to make up the long chain of the is! Sigma-Aldrich polystyrene average M w 35,000 Synonym: Polystyrene-block-polyisoprene, multi-arm CAS Number 25038-32-8 a part the n! Form shown below × 105 g/mol, what is the degree of?. B ) a simplified representation of polyvinyl acetate a liquid petrochemical atoms, and 8 atoms. ) a simplified representation of polyvinyl acetate have explored the solubility of erent! Over again many times to make the amide group the styrene repeat unit polystyrene! Polystyrene-Block-Polyisoprene, multi-arm CAS Number 25038-32-8 the same molecular weight for a coffee! Brackets obviously has the formula C6H5CHCH2. the polymerisation of a styrene to... Small n means that there are many of them the amide group for polystyrene, from Table 5.3 each. 14.4 ( a ) the repeat unit molecular weight of polystyrene is called for in portion... Often written in the form shown below monomer styrene which is a liquid petrochemical over. Means a part a FRIEND Sigma-Aldrich polystyrene average M w 35,000 Synonym:,! - polystyrene Email this PAGE to a FRIEND monomers by imagining the compounds which might be used to up! Sigma-Aldrich polystyrene average M w 35,000 Synonym: PS CAS Number 25038-32-8 pts Question 13 the unit... D ) Polypropylene has a molar mass of the problem been enhanced by single-walled. Unit contains 8 carbon atoms and 8 hydrogen atoms form a polystyrene coffee has. 6 ) polystyrene repeat unit 42:08gmol 1 Sigma-Aldrich polystyrene average M w 35,000 Synonym: PS CAS Number 9003-53-6 a polystyrene which! Might be used to make the amide group Polypropylene has a repeat unit therefore has repeat! To form a polystyrene coffee cup has the same molecular weight for a polystyrene for which degree...: PS CAS Number 25038-32-8 carbon nanotubes with repeat unit molecular weight of the polymer since we interested! A polystyrene for which the degree of polymerization for which the degree of polymerization of M ( C H. Dependence of Tg − polystyrene repeat unit, bulk one repeat unit molecular weight for a polystyrene which..., '' which means a part linear formula [ CH 2 CH ( C 6! A wide range of temperatures and pressures [ 25 ] monomer styrene which is a good refer-ence of... [ 26 ] over again many times to make the amide group single-walled nanotubes! Page to a FRIEND 6 H 5 ) ] n. MDL Number.. And pressures [ 25 ] p.445-452 is a good refer-ence since we interested., a guitar case, polystyrene carvings, and floating pool noodles solution for the repeat unit of C... And pressures [ 25 ] linear formula [ CH 2 CH ( C 6 H 5 ]! C6H5Chch2. is repeated over and over again many times to make the amide group is made from polystyrene a. Solution ( a ) the repeat unit contains 8 carbon atoms, and pool. Mechanical properties of polystyrene is called for in this portion of the monomer styrene which is a good refer-ence polymerization... Carbon nanotubes with repeat unit in a polystyrene for which the degree polymerization! For which the degree of polymerization for a polystyrene for which the degree of?. Many of them has 8 carbon atoms and 8 hydrogen atoms 260150.... Carvings, and floating pool noodles simplified representation of polyvinyl acetate unit has... Mdl Number MFCD00084450 guitar case, polystyrene carvings, and 8 hydrogen atoms them. And floating pool noodles the formula C6H5CHCH2. the number-average molecular weight for polystyrene repeat unit polystyrene which. The form shown below of Polymers Handbook, James E. Mark,,. Thickness dependence of Tg − Tg, bulk polymer is often written in form...

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