Thanks for your reply
Well,let me clarify further .I will studying the phenyl flips in the main chain of the polymer using NMR analysis.Using a polymer blend might complicate the test,so it will have to be a Homopolymer. Anyway I am looking at polyethylene isophthatate as an option.It seems Okay...
Is there any Polymer ( preferably available commercially ) which has the following properties...it should be amorphous,have Tg around 50-60 deg C with the catch that it should have a phenylene group(s) in its main chain. Thanks in advance.