Tough and tunable shape memory PLA/PAE melt-blends actuated by temperature

  • Zhenfang LiEmail author
  • Kangning Li
  • Haihua He
  • Yufen Zhou
  • Zhicai HeEmail author
Original Research


Development of shape memory materials are very important due to their scientific and technological values. Typically, poly(lactic acid) (PLA) has received increasing attentions because of shape memory properties and biodegradability, however, its semi-crystalline structure restricts its shape recovery ratio and toughness both. Herein, we report a reinforced PLA-based elastomer material prepared by physical blending with different weight ratios of polyamide elastomer (PAE). After the modification, PLA/PAE elastomers show excellent shape recovery (> 99%) from ~ 25 to ~ 70 °C and toughness (impact strength ~ 50 kJ/m2). By regulating the weight ratio of PAE at 10 wt%, the resulting PLA/PAE elastomers showed relative low glass transition temperature (Tg) at ~ 61 °C versus pure PLA (~ 65 °C). Besides, the storage modulus (E′) decreased to ~ 8000 MPa (at 10 wt% PAE) indicated that PAE weakened the PLA crystallinity and promoted its toughness. Comparing with pure PLA, PLA/PAE elastomers showed almost 45% decrease on loss modulus (E″), which indicated that elasticity and shape recovery behavior have been promoted. With the increase of PAE ratio in PLA/PAE elastomers, the initial recovery temperature of blends showed decreasing trend, which indicated that blends are more helpful for shape recovery actuated by temperature. This work provided a new PLA/PAE elastomer with stronger toughness and faster thermo-induced shape recovery that may show great potential for fundamental research and biomedical applications.


Poly(lactic acid) Polyamide elastomer Physical blend Shape memory Toughness Repeatability 



This study was financially supported by the Zhejiang Province Public Welfare Project (no. 2017C31112).

Supplementary material

13726_2019_706_MOESM1_ESM.docx (19 kb)
Supplementary material 1 (DOCX 19 KB)


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Copyright information

© Iran Polymer and Petrochemical Institute 2019

Authors and Affiliations

  1. 1.School of Pharmaceutical and Material EngineeringJin Hua PolytechnicJin HuaPeople’s Republic of China
  2. 2.School of Pharmaceutical and Materials EngineeringTaizhou UniversityTaizhouPeople’s Republic of China

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