Citation: Qian Xing, Rong-bo Li, Xia Dong, Xiu-qin Zhang, Liao-yun Zhang, Du-jin Wang. Phase Morphology, Crystallization Behavior and Mechanical Properties of Poly(L-lactide) Toughened with Biodegradable Polyurethane: Effect of Composition and Hard Segment Ratio[J]. Chinese Journal of Polymer Science, ;2015, 33(9): 1294-1304. doi: 10.1007/s10118-015-1679-y shu

Phase Morphology, Crystallization Behavior and Mechanical Properties of Poly(L-lactide) Toughened with Biodegradable Polyurethane: Effect of Composition and Hard Segment Ratio

Received Date: 31 January 2015
Revised Date: 1 April 2015

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 51403210), China Postdoctoral Science Foundation (No. 2014M550801) and President Fund of University of Chinese Academy of Sciences (No. Y35102CN00).

Polyester-based biodegradable polyurethane (PU) with different hard segment ratios was selected to modify the impact toughness of poly(L-lactide) (PLLA). The influence of blending composition and hard segment ratio of PU on the phase morphology, crystallization behavior and mechanical properties of PLLA/PU blends has been investigated systematically. The results showed that the PU particles were uniformly dispersed in PLLA matrix at a scale from sub-microns to several microns. The glass transition temperature of PU within these blends decreased compared to that of neat PU, but rose slightly with its content and hard segment ratio. The presence of PU retarded the crystallization ability of PLLA, whereas enhanced its elongation at break and impact resistance effectively. As the PU content reaches up to 30 wt%, the phenomenon of brittle-ductile transition occurred, resulting in a rougher fracture surface with the formation of fibril-like structure. Moreover, under the same concentrations, the elongation at break and impact strength of PLLA blends decreased slightly with the increase of hard segment ratio of PU.
- Poly(L-lactide),
- Polyurethane,
- Phase morphology,
- Impact modification,
- Hard segment ratio
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沈阳化工大学材料科学与工程学院沈阳 110142