Citation: 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 shu

Studies on Shape Memory Effect of Polynorbornene/Poly(lactic acid) Blends

Key Laboratory of Rubber-plastics, Ministry of Education, School of Polymer Science and Engineering, Qingdao University of Science & Technology, Qingdao 266042

Corresponding author: Xin-yan Shi, lindashi88@qust.edu.cn
Received Date: 11 April 2017
Revised Date: 22 May 2017

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 T_g 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.
- Polynorbornene,
- Poly(lactic acid),
- Shape memory effects,
- Stress relaxation,
- Crystallization
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