聚降冰片烯/聚乳酸共混物形状记忆效应的研究

肖雅; 曲明; 史新妍

doi:10.11777/j.issn1000-3304.2017.17085

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聚降冰片烯/聚乳酸共混物形状记忆效应的研究

研究论文 | 更新时间：2021-01-26

- 聚降冰片烯/聚乳酸共混物形状记忆效应的研究
- Studies on Shape Memory Effect of Polynorbornene/Poly(lactic acid) Blends
- 高分子学报 2018年第3期页码：402-409
- 作者机构：
  
  青岛科技大学高分子科学与工程学院橡塑材料与工程教育部重点实验室青岛 266042
- 作者简介：
  
  史新妍, E-mail: lindashi88@qust.edu.cnXin-yan Shi, E-mail: lindashi88@qust.edu.cn
- 基金信息：
  
  国家自然科学基金(51273101);山东省高校科技计划(J12LA14)
- DOI：10.11777/j.issn1000-3304.2017.17085
  中图分类号：
- 纸质出版日期：2018-3-20，
  
  收稿日期：2017-4-11，
  
  修回日期：2017-5-22，
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肖雅, 曲明, 史新妍. 聚降冰片烯/聚乳酸共混物形状记忆效应的研究[J]. 高分子学报, 2018,(3):402-409.

Ya Xiao, Ming Qu, Xin-yan Shi. Studies on Shape Memory Effect of Polynorbornene/Poly(lactic acid) Blends[J]. Acta Polymerica Sinica, 2018,(3):402-409.
肖雅, 曲明, 史新妍. 聚降冰片烯/聚乳酸共混物形状记忆效应的研究[J]. 高分子学报, 2018,(3):402-409. DOI： 10.11777/j.issn1000-3304.2017.17085.

Ya Xiao, Ming Qu, Xin-yan Shi. Studies on Shape Memory Effect of Polynorbornene/Poly(lactic acid) Blends[J]. Acta Polymerica Sinica, 2018,(3):402-409. DOI： 10.11777/j.issn1000-3304.2017.17085.

摘要

将聚降冰片烯（PNB）和聚乳酸（PLA）按照PNB/PLA（80/20）、（70/30）、（60/40）、（50/50）4种不同质量配比进行共混，采用X射线衍射（XRD）、动态力学分析（DMA）、示差扫描量热分析（DSC）等对共混物基本性能进行表征，同时采用DMA-Q800对其形状记忆效应进行探究.结果显示：4种共混物均有明显屈服现象，随着PLA含量的增加，屈服现象越明显；PNB/PLA共混物出现2个玻璃化转变温度（

），且不随共混物配比变化而变化；4种共混物均在2

=18.45º 附近出现特征衍射峰，且其结晶度随PNB含量的减少而降低；随PNB含量的增多4种共混物的形状记忆性能提高.对于PNB/PLA（80/20），在双重形状记忆中，其形状固定率为99.88%，形状恢复率为81.04%；在三重形状记忆中，总固定率和恢复率分别为98.83%和94.26%.

Abstract

Temperature responsive shape memory polymers (SMPs) find important applications in automotive

military

biomedical and other fields. In particular

SMPs responsive to human body temperature are highly desired for biomedical applications. Polynorbornene (PNB) has a

around human body temperature

exhibiting excellent shape memory properties

whereas poly(lactic acid) (PLA) has attracted great interest in biomedical fields due to its nontoxic and bioresorbable characteristics. Therefore

it is of great significance to explore the possibility of combining advantages of PNB and PLA. In this work

a simple blending strategy was adopted at varying weight ratios

and the shape memory

thermal and mechanical properties of the resultant blends were studied. The results showed that PLA promoted blend yield

and crystallization of PNB favored shape fixation and shape recovery. For PNB/PLA=80/20 blend

the shape fixation rate was 99.88% and the shape recovery rate was 81.04% with the average shape recovery rate of 1.2%/min in the double shape memory. The total shape fixation rate and shape recovery rate were 98.83% and 94.26%

respectively

in the triple shape memory. In PNB/PLA blends

there was a certain interaction between the molecules

which limited

to a certain extent

the movement of the two polymer chains and reduced the crystallization of PLA. When the temperature was over 100 ℃

cold crystallization of PLA appeared in the blends

and this cold crystallization degree increased with decreased PNB. With increased PNB content

PNB/PLA blend became more ductile

the elongation at break increased from a few percent to more than 200%

and the forced elastic deformation occurred

which were favorable for the shape fixation. In the blends

the super-macromolecular chains of PNB were intertwined

resulting in a large number of entanglement points

namely

physical cross-linking points in the materials

which could make the polymer chain movement seriously blocked and their wide range of slippage hampered

so as to provide the driving force for the shape recovery and to improve the shape recovery performance of the blends.

关键词

聚降冰片烯聚乳酸形状记忆应力松弛结晶

Keywords

PolynorbornenePoly(lactic acid)Shape memory effectsStress relaxationCrystallization

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