Polymers principles Given the following information, calculate the number-average molecular weight, the weight-average molecular weight, and...
4 (20 Points) Calculate the number-average molecular weight and the weight average molecular weight of a polymer sample made of polystyrene with a repeat unit of (CH2- CH(CHs)) and composed of two types of chains. 60 percent of the chains have a degree of polymerization of 7,000 and the rest 50,000. Carbon has an atomic weight of 12 g/mol and hydrogen is 1 g/mol.
Problem: 1.3: Calculate the number average and weight average relative molecular mass for a sample of polystyrene made by blending eight separate fractions, each of which has a very narrow molecular mass distribution, as follows: RMM | Weight/ g 15k 0.10 27k 0.19 39k56k78k 0.25 0.17 0.12 104k120k 0.08 0.06 153k 0.04 | Solution:
calculate the number average molecular weight of a copolymer erm Remmaining Time 13:27:41 Calculate the number-average molecular weight of a copolymer of butadiene and dimethylsilaxane in which 1/5 of the repeat units are butadiene, and the rest are dimethylsilacane. Assume the number-average degree of polymerization is 101.500. 8.01E6 amu 9.53E6 amu 7.12E6 amu O 6.66E6 amu Cuit & Save Back Question Menu SUbmit Assgnment
Molecular weight data for some polymer are tabulated. Determine: a) The number-average molecular weight b) The weight-average molecular weight c) What is the number-average degree of polymerization for this polymer? d) What is the weight-average degree of polymerization for this polymer? Side note: Please consider the monomer C3H6 Molecular weight data for some polymer are tabulated. Determine: The number-average molecular weight The weight-average molecular weight What is the number-average degree of polymerization for this polymer? What is the weight-average degree...
Calculate the number-average molecular weight of a random nitrile rubber [poly(acrylonitrile-butadiene) copolymer] in which the fraction of butadiene repeat units is 0.32; assume that this concentration corresponds to a degree of polymerization of 2030. Calculate the molecular weight of the acrylonitrile repeat unit in g/mol. Part 2 Calculate the molecular weight of the butadiene repeat unit in g/mol. Part 3 Calculate the average molecular weight of the copolymer repeat unit in g/mol. Click here to access Table 4.5. m =...
a) compute the repeat unit molecular weight of polystyrene b) compute the number-average molecular weight for polystyrene for which the degree of polymerization is 26,000. 54 (a) Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 26,000.
7. (19 points) The number average molecular weight of polypropylene is 1,5 Calculate the degree of polymerization. 00,000 g/mol.
7. Please calculate the number-averaged molecular weight and weight-averaged molecular weight for the following polymer. (6 pt) Fraction Mass(g) Mx 104(g/mol)1.24 1.521.361.282.301.504.28 1.21 1181.4567 0.23 0.18 0.56 0.82 3.76 8. A student mixed two batches of PS accidently in the lab, what would be number-averaged molecular weight and weight-averaged molecular weight for this PS mixture. (6 pt) Batch Mass(g) Mw (g/mol) Mn (g/mol 15 75,000 50,000 150,000 120,000
(a) Any polymeric material will have a distribution of molecular weights, and therefore an average molecular weight is used to characters the material. Is it possible to have a polyethylene homopolymer with the following molecular weight distribution data and a weight average degree of polymerization of 2090? Why or why not? The polyethylene mer is shown below. (b) Based on the mer structure shown for poly(methyl methacrylate) (PMMA) and polyethylene (PE). Which has potential for greater crystallinity? Provide a brief...
An alternating copolymer is known to have a number-average molecular weight of 250,000 g/mol and a number-average degree of polymerization of 3406. One of the alternating mers is polystyrene which has a molecular weight of 105_g/mol. Given that the molecular weight of polypropylene is 42 g/mol and that of polyvinyl chloride is 61.5 g/mol, Which of them is the other alternating mer?