Optically triggered and spatially controllable shape-memory polymer–gold nanoparticle composite materials
Optically triggered and spatially controllable shape-memory polymer–gold nanoparticle composite materials
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DOI：
10.1039/c1jm14615g
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发表时间：
2012
影响因子：
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通讯作者：
Hongji Zhang;H. Xia;Yue Zhao
中科院分区：
文献类型：
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作者：
Hongji Zhang;H. Xia;Yue Zhao
制备并研究了一种新型光触发形状记忆复合材料。将聚（ε-己内酯）（PCL）-表面官能化的金纳米粒子负载在与二异氰酸酯（HMDI）交联的生物可降解的支化寡聚（ε-己内酯）（bOCL）的热敏形状记忆聚合物（SMP）基质中，称为XbOCL。通过利用局部光热效应所产生的SPR吸收的金纳米粒子，我们能够证明一个光学触发和空间选择性的形状恢复过程中，拉伸的金纳米粒子加载的XbOCL膜经历逐步收缩和升降的负载。由于形状恢复过程可以在任何时候通过关闭曝光来停止，因此可以容易地获得多种中间形状。这些是不能从基于体热效应的热激活SMP获得的吸引人的特征。此外，可以通过调节激光功率来控制材料的光致温度升高的幅度，还可以将相同的负载AuNP的复合材料用于具有低于T转变的不同环境温度的应用，因为在T > T转变处的热转变可以由来自不同环境温度的激光光学诱导。
A new optically triggered shape memory composite material was prepared and investigated. Poly(e-caprolactone) (PCL)-surface functionalized AuNPs were loaded in a thermosensitive shape-memory polymer (SMP) matrix of biodegradable, branched oligo(e-caprolactone) (bOCL) cross-linked with hexamethylene diisocyanate (HMDI), referred to as XbOCL. By making use of a localized photothermal effect arising from the SPR absorption of AuNPs, we are able to demonstrate an optically triggered and spatially selective shape recovery process, with a stretched AuNP-loaded XbOCL film undergoing stepwise contraction and lifting of a load. Since the shape recovery process can be halted at any time by turning off the light exposure, multiple intermediate shapes can readily be obtained. These are appealing features that cannot be obtained from thermally activated SMPs based on a bulk thermal effect. Moreover, the magnitude of the photoinduced temperature increase of the material can be controlled by adjusting the laser power, it is also possible to use the same AuNP-loaded composite material for applications with different environmental temperatures below Ttransition, since the thermal transition at T > Ttransition can be optically induced by a laser from different environmental temperatures.