d u03b4 8 25 7 95 arh u2014 m backbone 4 70 4 30 coo u2014 ch 2 u2014 m backbone 2 20 1 80 u2014 ch 2 u2014 m backbone thermal data t g 42 4 u00b0 c t m 223 u00b0 c m n 10 9 u00d7 10 3 da m w 19 2 u00d7 10 3 da example 1 section d was repeated except that 20 g of the 4 gt homopolymer prepared in example 5 section c were substituted for the 15 3 g of 3 gt in example 1 59 4 g of the 3 gf 16 iso prepared in example 1 section b were used instead of the 46 g used in example 1 section d 23 mg of tyzor u00ae tpt was used instead of the 18 mg used in example 1 section d and the reaction vessel was held for 2 hours at 250 u00b0 c instead of 3 hours as in example 1 section d 13 c nmr tce d2 u03b4 62 8 e 62 6 d 62 6 g 62 4 f b 0 65 thermal data t g1 11 1 u00b0 c t g2 47 2 u00b0 c t m 206 8 u00b0 c m n 86 6 u00d7 10 3 da m w 208 6 u00d7 10 3 da the 3 gf 16 iso prepared in example 1 section b was employed herein example 1 section c was repeated except that a combination of 145 5 g of dimethylterephthalate and 3 9 g.