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Int. J. Mol. Sci. 2013, 14(10), 20189-20203; doi:10.3390/ijms141020189

Effect of Chain-Extenders on the Properties and Hydrolytic Degradation Behavior of the Poly(lactide)/ Poly(butylene adipate-co-terephthalate) Blends

*  and *
The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
* Authors to whom correspondence should be addressed.
Received: 2 September 2013 / Revised: 15 September 2013 / Accepted: 23 September 2013 / Published: 10 October 2013
(This article belongs to the Section Biochemistry, Molecular Biology and Biophysics)
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Biodegradable poly(lactide)/poly(butylene adipate-co-terephthalate) (PLA/PBAT) blends were prepared by reactive blending in the presence of chain-extenders. Two chain-extenders with multi-epoxy groups were studied. The effect of chain-extenders on the morphology, mechanical properties, thermal behavior, and hydrolytic degradation of the blends was investigated. The compatibility between the PLA and PBAT was significantly improved by in situ formation of PLA-co-PBAT copolymers in the presence of the chain-extenders, results in an enhanced ductility of the blends, e.g., the elongation at break was increased to 500% without any decrease in the tensile strength. The differential scanning calorimeter (DSC) results reveal that cold crystallization of PLA was enhanced due to heterogeneous nucleation effect of the in situ compatibilized PBAT domains. As known before, PLA is sensitive to hydrolysis and in the presence of PBAT and the chain-extenders, the hydrolytic degradation of the blend was evident. A three-stage hydrolysis mechanism for the system is proposed based on a study of weight loss and molecular weight reduction of the samples and the pH variation of the degradation medium.
Keywords: PLA; PBAT; compatibilization; properties; degradation PLA; PBAT; compatibilization; properties; degradation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Dong, W.; Zou, B.; Yan, Y.; Ma, P.; Chen, M. Effect of Chain-Extenders on the Properties and Hydrolytic Degradation Behavior of the Poly(lactide)/ Poly(butylene adipate-co-terephthalate) Blends. Int. J. Mol. Sci. 2013, 14, 20189-20203.

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