The design of triple shape memory polymers with stable yet tunable temporary shapes by introducing photo-responsive units into a crystalline domain

被引:10
|
作者
Wu, Yongwei [1 ]
Hu, Zhitao [1 ]
Huang, Huahua [1 ]
Chen, Yongming [1 ]
机构
[1] Sun Yat Sen Univ, Sch Mat Sci & Engn, Key Lab Polymer Composite & Funct Mat, Ctr Funct Biomat,Minist Educ, 135 Xingang Xi Rd, Guangzhou 510275, Guangdong, Peoples R China
关键词
COPOLYMER; NETWORKS; POLYMERIZATION;
D O I
10.1039/c8py01810c
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A desirable triple-shape memory effect (triple-SME) showing stable yet easily tunable temporary shapes is achieved using a physically crosslinked network with photo-responsive coumarin-containing poly (epsilon-caprolactone) (PMCL) as soft segments and poly(L-lactide) (PLLA) as hard segments. A controlled ring-opening polymerization in combination with post-modification was utilized to introduce a small amount of coumarin units into the PMCL soft segments. As a result, both the soft and hard segments maintained high crystallinity. The copolymers exhibited a triple-SME with staged shape recoveries firstly upon heating, and then upon UV irradiation at lambda = 254 nm plus heating, using a one-step deformation programming procedure under UV irradiation at lambda = 365 nm when the dimerization of coumarin units was performed. By only adjusting the photo-crosslinking intensity and time, the ratios of the first and second shape recovery steps can be tuned and the ratio of the second recovery step was high up to 52.5%. Moreover, the temporary shape C was highly stable and can be used as a complex permanent shape for thermal sensitive SME.
引用
收藏
页码:1537 / 1543
页数:7
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