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一种具有双向形变记忆功能的光致弯曲聚合物材料,在光驱动型执行器中应用潜力较大。材料的力学性能及光致弯曲特性,是执行器结构设计和分析的必要依据。通过拉伸实验,了解到材料具有线弹性材料类似的力学性能,并得到了其弹性模量。通过对材料光致弯曲效应的分析,推导出光致弯曲曲率的表达式。利用该公式,对光致弯曲实验观测到的数据进行非线性拟合,得到材料的光致弯曲特性参数。计算曲率较好地符合了实验数据,证明了公式和参数的合理性。
A kind of photorefractive polymer material with bi-directional deformation memory has great potential in light-driven actuators. The mechanical properties and photo-bending properties of the material are the necessary basis for the design and analysis of the actuator. Through the tensile test, we know that the material has the similar mechanical properties of the linear elastic material and the elastic modulus. Based on the analysis of the material’s photo-bending effect, the expression of the photo-induced bending curvature is deduced. By using this formula, the data of the photorefractive experiment was fitted to the nonlinear curve to get the parameter of the photorefractive properties of the material. The calculated curvature is in good agreement with the experimental data, which proves the rationality of the formulas and parameters.