Journal
POLYMER DEGRADATION AND STABILITY
Volume 96, Issue 5, Pages 991-999Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2011.01.023
Keywords
Copolyester; Hydrolysis; Crystallization; Ring-banded spherulites
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Funding
- National Key Technology RD Program [2007BAE28B06]
- Zhejiang Province Science and Technology Project [2007C31031]
- Natural Science Foundation of Zhejiang Province [Y4064417]
- Ningbo Natural Science Foundation [2006A610071, 200801A6005046, 2010A610193]
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In this study, poly(trimethylene terephthalate)-co-poly(L-lactic acid) (PTT-co-PLLA) copolyesters with different compositions were synthesized by melt polycondensation. The crystal morphologies of PTT-co-PLLA copolyesters were investigated with polarized light microscope (PLM). It was found that PTT-co-PLLA copolyesters exhibited banded spherulites with smaller band spacing at the same degree of super-cooling compared with PTT homopolymer. The PLLA segments in those copolyesters ranged from 0 to 28.4 mol% and did not form crystals during crystallization. Hydrolysis study on PTT homopolymer and PTT-co-PLLA copolyesters was carried out in buffer solutions. PTT-co-PLLA copolyesters represented pronounced hydrolytic degradation, which increased with the content of lactyl units. And it was concluded that degradation of PTT-co-PLLA was mainly attributed to the scission of PLEA segments. (C) 2011 Elsevier Ltd. All rights reserved.
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