In this study, we investigated the shape memory properties of a novel self-reinforced polymer composite (SRPC). Chopped Dyneema® SK76 fibers were mixed with high-density polyethylene (HDPE) resin, and samples were produced by injection molding. To allow the fibers to keep their shape and reinforce effectively, we cross-linked them with gamma irradiation (100, 200, and 300 kGy absorbed doses). In the second step of irradiation, we irradiated the composites with doses of 50, 100, 150, and 200 kGy to give them shape memory properties. Soxhlet extractions, differential scanning calorimetry, and scanning electron microscopy revealed that the fibers cross-linked and kept their structural integrity through processing. We confirmed the reinforcing effect of the fibers with flexural tests and by dynamic mechanical analysis. In free recovery experiments, samples had recovery and fixity ratios above 79%. With the highest dose, recovery stress increased by 26%. We showed the viability of this novel method of self-reinforcement in the production of shape memory polymers (SMPs) with improved characteristics.

中文翻译：

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注塑成型交联全聚乙烯复合材料的形状记忆特性


在这项研究中，我们研究了一种新型自增强聚合物复合材料 （SRPC） 的形状记忆特性。将短切的 Dyneema® SK76 纤维与高密度聚乙烯 （HDPE） 树脂混合，并通过注射成型生产样品。为了使纤维保持其形状并有效加固，我们用伽马射线（100、200 和 300 kGy 吸收剂量）将它们交联。在第二步辐照中，我们用 50、100、150 和 200 kGy 的剂量照射复合材料，赋予它们形状记忆特性。索氏萃取、差示扫描量热法和扫描电子显微镜显示，纤维交联并在加工过程中保持其结构完整性。我们通过弯曲测试和动态力学分析证实了纤维的增强效果。在自由回收率实验中，样品的回收率和固定率高于 79%。使用最高剂量时，恢复压力增加了 26%。我们展示了这种新的自我增强方法在生产具有改进特性的形状记忆聚合物 （SMP） 中的可行性。