Thermally Initiated Trans-esterification in Poly(ε-caprolactone) and Its Dependence on Molecular Weight

Journal of Polymers and the Environment - Tập 22 - Trang 479-487 - 2014
Jit Pal1, Sunita Sanwaria1, Aman Choudhary1, Kapeesh Thakur1, Bhanu Nandan1, Rajiv K. Srivastava1
1Department of Textile Technology, Indian Institute of Technology Delhi, New Delhi, India

Tóm tắt

Biodegradability and biocompatibility of poly(ε-caprolactone) (PCL) are the prime properties which advanced the use of this polymer in fields of tissue engineering and biomedicals. Being an aliphatic polyester, PCL is prone to undergo trans-esterification which is one of the mechanisms reported for its degradation besides being used in making its copolymers. Trans-esterification occurs both, inter- and intra-molecularly and in this work we report that the mechanism of trans-esterification depends on the molecular weight of the polymer when it is subjected to 160 °C for time up to 24 h. For low molecular weight PCL (Mp = 10,000 g/mol) inter-molecular trans-esterification is the predominant mechanism while for the high molecular weight PCL (Mp = 80,000 g/mol) it is intra-molecular. A mid molecular weight PCL (Mp = 43,000 g/mol) showed presence of both, inter- as well as intra-molecular trans-esterification, when heated at 160 °C for 24 h. A decrease in relative crystallinity for all the samples showed reduction in crystalline component of the polymer confirming occurrence of trans-esterification at chosen conditions. An increase in tensile strength and modulus is observed after treatment at 160 °C for 24 h due to formation of more entangled network of polymer chains as a result of trans-esterification reactions.

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Thông tin xuất bản

Journal of Polymers and the Environment

Tập 22

479-487

Thông tin tác giả