8.a) A random poly(styrene-butadiene) copolymer has a weight-average molecular weight of 467,500 g/mol and a weight-average...
3 8.a) A random poly(styrene-butadiene) copolymer has a weight-average molecular weight of 467,500 g/mol and a weight-average degree of polymerization of 5500. Calculate the fraction of styrene (CsHg) and butadiene (C4H6) mers in this copolymer. Atomic weights: C-12, H-1 b) What weight % sulphur must be added to vulcanize polyisoprene (mer weight = 68) by crosslinking one half the possible sites. In this elastomer, each pair of mers has two possible crosslink sites. Assume three sulphur atoms are involved in...
What weight % sulphur must be added to vulcanize polyisoprene (mer weight = 68) by crosslinking one half the possible sites. In this elastomer, each pair of mers has two possible crosslink sites. Assume three sulphur atoms are involved in each crosslink. Atomic weight: S-32
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
b) What weight % sulphur must be added to vulcanize polyisoprene (mer weight = 68) by crosslinking one half the possible sites. In this elastomer, each pair of mers has two possible crosslink sites. Assume three sulphur atoms are involved in each crosslink. Atomic weight: S-32 (10) 9. Copper and silver are in contact with an aqueous solution at 25°C containing Cu2+ and Ag* ions setting up a corrosion cell. a) Show the anode and cathode reactions. b) Now show...
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 =...
An alternating poly(ethylene-styrene) copolymer has a molecular weight of 97,917 g/mol. How many styrene repeat units are in one average chain of this polymer.
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?
Please zoom in for the first part Calculate the number-average molecular weight of a random nitrile rubber [polyacrylonitrile-butadiene) copolymer] in which the fraction of butadiene repeat units is 0.31: assume that this cancentration corresponds to a degree af polymerization of 2000. ? Part1 Calculate the molecular welght of the acrylonitrile repeat unit in a/mol click here to access Iable 14.5 Atomic weights for several elements are included in the following table Carbon12.01 g/mal Chlorine 35.45 g/mal Fluorine 19.00 a/mol Hydrogen...