Mse 430 fall 2015 problem setwrite down a reaction scheme, Ask an Expert

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MSE 430 Fall 2015 Problem Set

Write down a reaction scheme for polymerization of styrene (CH₂=CHPh) initiated by thermolysis of azobisisobutyronitrile (AIBN), including both combination and disproportionation as possible modes of termination.

A sample of polystyrene prepared by bulk polymerization at 60°C using radioactive (¹⁴C)

AIBN as initiator, was found to have M_n average = 1000 kg mol^-1 and a radioactivity of 6 x 10³counts s^-1 g^-1 (measured using a liquid- cintillation counter). Given that the AIBN has a radioactivity of 6 x 10⁹ counts s^-1 mol^-1, determine the mode of termination which operated in the preparation of the polystyrene sample

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