The Shape Memory Properties of Biodegradable Chitosan/Poly(l-lactide) Composites |
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| Authors: | Qinghao Meng Jinlian Hu KaiChiu Ho Fenglong Ji Shaojun Chen |
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| Institution: | (1) Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People’s Republic of China;(2) The Hong Kong Research Institute of Textiles and Apparel, Kowloon, Hong Kong, People’s Republic of China; |
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| Abstract: | The shape memory behavior of PLLA (poly(l-lactide)) and chitosan/PLLA composites was studied. PLLA and chitosan were compounded to fabricate novel materials which
may have biodegradability and biocompatibility. Chitosan does not significantly affect the glass and melting transition temperature
of the PLLA. Both the pure PLLA and chitosan/PLLA composites showed shape memory effect arising from the viscoelastic properties
of PLLA comprised of semi crystalline structures. The shape recovery ratio of the chitosan/PLLA composites decreased significantly
with increasing chitosan contents due to the incompatibility between PLLA and chitosan. Phase separation structures of the
composites were observed by using atomic force microscopy. To obtain good shape memory effect, the chitosan content should
be below 15 wt%. |
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