Tunable Temperature Memory Effect of Photo-Cross-Linked Star PCL-PEG Networks
Tunable Temperature Memory Effect of Photo-Cross-Linked Star PCL-PEG Networks
复制标题
光交联星形 PCL-PEG 网络的可调温度记忆效应
DOI：
10.1021/ma4023229
复制
发表时间：
2014-03-11
期刊：
影响因子：
5.5
通讯作者：
Zhou, Shaobing
中科院分区：
文献类型：
--
作者：
Wang, Lin;Di, Shubin;Zhou, Shaobing
本研究通过肉桂基封端的四臂聚己内酯（4sPCL-CA）和肉桂基封端的聚乙二醇（PEG-CA）在365 nm紫外光照射下光交联，合成了一种具有良好温度记忆效应（TME）的生物相容性和生物可降解性的交联星星型聚己内酯聚乙二醇（c-4sPCL-PEG）。差示扫描量热法（DSC）和动态力学分析（DMA）结果表明，c-4sPCL PEG网络具有较宽的转变温度范围（20 ~ 55 ℃），包括较宽的高弹性转变区和熔融转变区。在此温度范围内，通过调节变形温度（Td），可以得到一个与人体体温接近的记忆温度。此外，可以通过简单地改变PCL链段的分子量或含量来调节TME。首次采用X射线衍射（XRD）和二维红外相关光谱（2D-FTIR）对不同温度下的TME机理进行了详细的研究，结果表明，TME是由于星星交联聚合物网络的部分结晶发生了变化，从而导致了宽的转变温度。该研究为智能生物医学设备领域应用的有前途的智能材料的设计和工程提供了一个简单的策略。
In this study, we synthesized one type of biocompatible and biodegradable cross-linked star poly(epsilon-caprolactone) poly(ethylene glycol) (c-4sPCL-PEG) with an excellent temperature memory effect (TME) by photo-cross-linking of cinnamon group terminated four arms poly(epsilon-caprolactone) (4sPCL-CA) and cinnamon group terminated poly(ethylene glycol) (PEG CA) through the irradiation of 365 nm ultraviolet (UV) light. The results of differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) demonstrated that the c-4sPCL PEG networks possessed a broad transition temperature region from 20 to 55 degrees C, which including a wide high elasticity transition region and a melting transition region. A remembered temperature in this temperature range, which is close to body temperature, could be gained by adjusting the deformed temperature (T-d). Moreover, the TME could be tuned by simply changing the molecular weight or the content of PCL segment. The mechanism of the TME was investigated in detail for the first time with X-ray diffractometry (XRD) and two-dimensional infrared correlation spectroscopy (2D-FTIR) at different temperatures, and the results indicated that the TME was resulted from a change in partial crystallization of the star cross-linked polymer networks, which led to the wide transition temperature. The study provides a facile strategy toward the design and engineering of a promising smart material for applications in the field of smart biomedical devices.