Study Of Structure And Performance On PTT And PTT/PET Copolyester

Poly(trimethylene terephthalate) is a new kind of polyester, which will be widely used in textile, engineering plastics, films etc. for its special structure and excellent physical-chemical property. 1,3-Propanediol(PDO) is the main material of PTT synthesized. In this article, PTT(B-PTT) was synthesized with 1,3-PDO produced by biosynthesis called as "green industry"by means of direct esterification and polycondensation and its structure was characterized by IR, ~1H NMR. PTT synthesized are mainly influenced by quality of 1,3-PDO, condensation time and condensation temperature etc.The properties of B-PTT were studied and compared with PTT(C-PTT ) synthesized with PDO produced by chemosynthesis by means of DSC, TG and WAXD. The results show that B-PTT is more superior in colour and higher intrinsic viscosity and molecular weight than C-PTT; in addition, intrinsic viscosity and molecular weight increase with the increase of purity. The melting peak of them varies little, but the former is more sharp in melting amplitude, higher in crystallinity than the latter. PTT synthesized with...