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Phase morphology, crystallization behavior and mechanical properties of poly(L-lactide) toughened with biodegradable polyurethane: Effect of composition and hard segment ratio

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Abstract

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 submicrons 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.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, University of Chinese Academy and Sciences, Beijing, 100049, China

    Qian Xing & Liao-yun Zhang

  2. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    Qian Xing, Xia Dong  (董侠), Xiu-qin Zhang & Du-jin Wang

  3. Petrochina Petrochemical Research Institute, Beijing, 100195, China

    Rong-bo Li

Authors
  1. Qian Xing
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  2. Rong-bo Li
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  3. Xia Dong  (董侠)
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  4. Xiu-qin Zhang
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  5. Liao-yun Zhang
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  6. Du-jin Wang
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Corresponding author

Correspondence to Xia Dong  (董侠).

Additional information

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).

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Xing, Q., Li, Rb., Dong, X. et al. Phase morphology, crystallization behavior and mechanical properties of poly(L-lactide) toughened with biodegradable polyurethane: Effect of composition and hard segment ratio. Chin J Polym Sci 33, 1294–1304 (2015). https://doi.org/10.1007/s10118-015-1679-y

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  • DOI: https://doi.org/10.1007/s10118-015-1679-y

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