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

Qian Xing; Rong-bo Li; Xia Dong; Xiu-qin Zhang; Liao-yun Zhang; Du-jin Wang

doi:10.1007/s10118-015-1679-y

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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

PAPER | Updated：2021-06-21

- Phase Morphology, Crystallization Behavior and Mechanical Properties of Poly(L-lactide) Toughened with Biodegradable Polyurethane: Effect of Composition and Hard Segment Ratio
- Chinese Journal of Polymer Science Vol. 33, Issue 9, Pages: 1294-1304(2015)
- Affiliations：
  
  a.School of Chemistry and Chemical Engineering, University of Chinese Academy and Sciences, Beijing 100049, China
  b.Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  c.Petrochina Petrochemical Research Institute, Beijing 100195, China
- Author bio：
  
  **Xia Dong (董侠), E-mail: xiadong@iccas.ac.cn
- Funds：
- DOI：10.1007/s10118-015-1679-y
  CLC：
- Received：31 January 2015，
  
  Revised：2015-04-01，
  
  Accepted：03 April 2015，
  
  Published：2015-09
- Accepted：
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Qian Xing, Rong-bo Li, Xia Dong, et al. 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：

Qian Xing, Rong-bo Li, Xia Dong, et al. 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.

摘要

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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