In Situ X-Ray Scattering Studies of Poly(ε-caprolactone) Networks with Grafted Poly(ethylene glycol) Chains to Investigate Structural Changes during Dual- and Triple-Shape Effect.
In Situ X-Ray Scattering Studies of Poly(ε-caprolactone) Networks with Grafted Poly(ethylene glycol) Chains to Investigate Structural Changes during Dual- and Triple-Shape Effect.
复制标题
具有接枝聚乙二醇链的聚（ε-己内酯）网络的原位 X 射线散射研究，以研究双形和三形效应期间的结构变化
DOI：
10.1002/marc.201000122
复制
发表时间：
2010
影响因子：
4.6
通讯作者：
Lendlein A
中科院分区：
文献类型：
--
作者：
Wagermaier W;Zander T;Hofmann D;Kratz K;Narendra Kumar U;Lendlein A
通过X射线测量和热机械研究相结合的方法，原位评估了含有两个可结晶链段的多相聚合物网络的双形状和三形状效应。所研究的聚合物名为CLEG，是带有接枝聚乙二醇侧链的可结晶聚(ε-己内酯)(PCL)的多相聚合物网络。将广角(WAXS)和小角X射线散射(SAXS)测量与温控原位拉伸试验相结合。这一综合办法使得能够在方案编制程序和热致恢复过程中系统地调查和解释相关的结构特征。主要结果涉及PCL和聚乙二醇单晶体在定形中的联合作用，低熔点PCL微晶在固定低温临时形状中的特殊作用，以及PCL和聚乙二醇单晶体在编程过程的某些阶段的不同取向行为。这些结果表明，PCL晶体的晶体取向效应占主导地位。只有在施加同步辐射的情况下，才能研究低温PCL晶体的影响。这些发现表明，现场X射线研究在创造与设计相关的知识方面具有巨大潜力，这些知识涉及适当聚合物体系中双重和三重形状效应的微观基础。
The dual‐ and triple‐shape effects of multiphase polymer networks that contain two crystallizable chain segments have been assessed in situ by combining X‐ray measurements with thermomechanical investigations. The studied polymer, named CLEG, is a multiphase polymer network of crystallizable poly(ε‐caprolactone) (PCL) with grafted poly(ethylene glycol) (PEG) side chains. Wide‐angle (WAXS) and small‐angle X‐ray scattering (SAXS) measurements were combined with temperature‐controlled in situ tensile testing experiments. This integrated approach enables systematic investigation and interpretation of relevant structural features during the programming procedures and the thermally‐induced recovery process. Main results concern the combined effect of PCL and PEG crystals on shape fixation, the specific role of low‐melting PCL crystallites in the fixation of the low temperature temporary shape, and the different orientation behavior of PCL and PEG crystals during certain stages of the programming procedure. These results demonstrate that crystal orientation effects are dominant for the PCL crystals. The effects of the low temperature PCL crystals could only be investigated when synchrotron radiation was applied. These findings indicate the great potential of in situ X‐ray investigations for the creation of design‐relevant knowledge about the microscopic foundations of dual‐ and triple‐shape effects in appropriate polymer systems.
X 射线散射研究研究基于聚（ε-己内酯）和聚（甲基丙烯酸环己酯）链段的聚合物网络的三重形状能力
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
W. Wagermaier;D. Hofmann;K. Kratz;M. Behl;A. Lendlein
通讯作者：
A. Lendlein