Table 1.

Characteristic data of PBT and PBT-co-PTMEG copolymers.

Sample	I.V.	Mn	wPTMEG−Feed	wPTMEG−NMR
	(dL g−1)	(g mole−1)	(wt%)	(wt%)
PBT	0.99	34,384	0	0
PBT-co-PTMEG-10	0.90	30,654	10	9.1
PBT-co-PTMEG-20	0.85	28,614	20	17.5
PBT-co-PTMEG-30	1.16	41,618	30	28.5
PBT-co-PTMEG-40	1.33	49,073	40	41.8