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首页> 外文会议>Conference on industrial and commercial applications of smart structures technologies; 20090309-10; San Diego, CA(US) >Constitutive Model for Photo-Mechanical Behaviors of Photo-Induced Shape Memory Polymers
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Constitutive Model for Photo-Mechanical Behaviors of Photo-Induced Shape Memory Polymers

机译：光诱导形状记忆聚合物光机械行为的本构模型

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摘要

Light-activated polymers are an exciting class of materials that respond mechanically when irradiated at particular wavelengths. Recent demonstrations include two novel polymers developed by Scott et al (2006) and Lendlein et al (2005). In these polymers, photochemistry alters the microstructure of the cross-linked polymer network, which is further translated as light-induced deformation and when properly used light-induced shape memory effect. In this work, we develop a model framework to simulate the photomechanical response of light-activated polymer systems. This framework breaks down the observed macroscopic photomechanical phenomenon into four coupled sets of underlying physics, which occur throughout the material during irradiation and mechanical deformation. In the context of this framework, a basic photomechanical phenomenon involves simultaneously modeling photophysics, photochemistry, chemomechanical coupling, and mechanical behavior. Furthermore, network alteration are accounted for through the parallel decomposition of the cross-linked network into two components, an original network and a photochemically altered network, which allows to capture the observed photomechanical behaviors demonstrated in these materials. One of the principal strengths of this model framework is its generality as it can be applied to light activated polymer systems with fundamentally different of photophysics, photochemistry, and chemomechanical behaviors simply by choosing different field equations for the four sets of physics specific to a material system.
机译：光活化聚合物是一类令人兴奋的材料，当以特定波长照射时，它们会产生机械响应。最近的演示包括Scott等（2006）和Lendlein等（2005）开发的两种新型聚合物。在这些聚合物中，光化学改变了交联聚合物网络的微观结构，这进一步转化为光致变形以及在适当使用时的光致形状记忆效应。在这项工作中，我们开发了一个模型框架来模拟光激活聚合物系统的光机械响应。该框架将观察到的宏观光机械现象分解为四个耦合的基础物理组，这些物理组在辐照和机械变形过程中遍及整个材料。在此框架的上下文中，基本的光机械现象涉及同时对光物理，光化学，化学机械耦合和机械行为进行建模。此外，网络改变是通过将交联网络并行分解为两个组成部分（原始网络和光化学改变的网络）来解决的，这可以捕获在这些材料中展示的观察到的光机械行为。该模型框架的主要优点之一是它的通用性，因为它可以简单地为材料系统特有的四组物理场选择不同的场方程，从而将其应用于具有光物理，光化学和化学机械行为的根本不同的光活化聚合物系统。

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