ABSTRACT

A facile and ecologically friendly method to prepare shape-memory Poly(ϵ-caprolactone) (PCL) films via Ultraviolet (UV) irradiation is described in this work. Benzophenone (BP), as a photoinitiator, was melt-blended with PCL particles directly and then melt-pressed into films. Afterward, a series of shape-memory films were obtained by UV (at around λ=365 nm) irradiation crosslinking. A sequence study and comparison on the properties changes caused by the effect of irradiation temperature was carried out and it turns out that the gel fraction, shape-memory properties and tensile properties of the PCL films, which were photo-crosslinked at 55°C, were significantly higher than that at 25°C. The effect of photoinitiator contents and irradiation time on gel fraction, shape memory properties and tensile properties was also studied. It is considered that UV irradiation is an efficient method to prepare PCL shape-memory films.

摘要

这项工作描述了一种通过紫外线 (UV) 照射制备形状记忆聚 (ε-己内酯) (PCL) 薄膜的简便且生态友好的方法。二苯甲酮 (BP) 作为光引发剂，直接与 PCL 颗粒熔融共混，然后熔融压制成薄膜。之后，通过UV（大约λ=365 nm）辐照交联获得了一系列形状记忆薄膜。对辐照温度影响引起的性能变化进行了序列研究和比较，结果表明在 55°C 下光交联的 PCL 薄膜的凝胶分数、形状记忆性能和拉伸性能，明显高于 25°C。还研究了光引发剂含量和照射时间对凝胶分数、形状记忆性能和拉伸性能的影响。