Chapter 15, Practice Problem 15.17 The tensile strength and number-average molecular weight for two poly(methyl methacrylate)...
Incorrect The tensile strength and number-average molecular weight for two polyethylene materials are as follows: Tensile Strength (MPa) Number-Average Molecular Weight (g/mol) 20,000 40,000 190 Estimate the number-average molecular weight that is required to give a tensile strength of 79 MPa. g/mol
Consider the following two polymeric systems: A. Poly(styrene-butadiene) amorphous copolymer having a number-average molecular weight of 50,000 g/mol, and 8% of the available sites crosslinked. B. Poly(styrene-butadiene) amorphous copolymer having a number-average molecular weight of 200,000 g/mol, and 20% of the available sites crosslinked. Respond to the following questions and justify your answer. a) Which polymer will display the highest stiffness? Why? (2 points) b) Which polymer will display the highest tensile strength? Why? (2 points) c) Consider that polymer...
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 =...
The number-average molecular weight of a poly(styrene-butadlene) alternating copolymer Is 1352000 g/mol. For each molecule of this copolymer determine the average number of repeat units of styrene butadiene Atomic weights for several elements are included in the following table: Carbon 12.01 g/mol Chlorine 35.45 g/mol Fluorine 19.00 g/mol Hydrogen 1.008 g/mol Oxygen 16.00 g/mol Nitrogen 14.01 g/mol styrene repeat units butadiene repeat units
this is the full table
Problem 5 (10pts) The following table lists molecular weight data for a polyethylene material. Compute (a) the number-average molecular weight, and (b) the degree of polymerization. Molecular Weight Range (g/mol) 8,000-20,000 20,000-32,000 32,000-44,000 44,000-56,000 56,000-68,000 68,000-80,000 80,000-92,000
Problem 5 (10pts) The following table lists molecular weight data for a polyethylene material. Compute (a) the number-average molecular weight, and (b) the degree of polymerization. Molecular Weight Range (g/mol) 8,000-20,000 20,000-32,000 32,000-44,000 44,000-56,000 56,000-68,000 68,000-80,000 80,000-92,000
only questions number: #3,6,8,16,19,22
Δι CH 122 - Practice Problems for Chapter 12 Do NOT use this problem set solely as test preparation. This problem set does NOT cover everything that we have discussed in class. You will still need to study class materials in order to do well on the learning assessment. 1. Of the following all are valid units for a reaction rate except A. moll B. M/S C. molhr D.g's E.molle 2. Which one of the following...