Question: Why does the glass transition temperature decrease for the series: polypropylene, poly(1-ethyl ethylene) and poly(1-propyl ethylene)? Why is low density polyethylene only produced by radical

  1. Why does the glass transition temperature decrease for the series: polypropylene, poly(1-ethyl ethylene) and poly(1-propyl ethylene)?
  2. Why is low density polyethylene only produced by radical polymerization but both low and high density polyethylene may be manufactured using coordination polymerization?

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