Biaxial Stretching of Ultra-High Strength Polyolefin Gel Films

本课题主要研究超高分子量聚乙烯的双向拉伸 分子量聚烯烃凝胶膜，特别是UHMWPE和HDPE。 单轴拉伸UHMWPE凝胶显示出超高强度 与钢或Kevlar纤维等同类材料相当。 然而，这种单轴驱动的光纤在制造方面固有地较弱。 由于纤维化而导致的横向方向。 横向强度可以 通过在膜中引入双轴取向， 凝胶。 PI将在 双轴拉伸以限制样品厚度的显著减小 在双轴拉伸过程中。 另一个将涉及的领域是 通过探测标记分子来研究凝胶绘制的机制。 一 第三个领域，将解决的是一个研究融化， 超高分子量聚乙烯凝胶的结晶行为和变形 凝胶球晶的时间分辨光机制 散射、SAXS、WAXD和光学显微镜。

The project deals with the study of biaxial stretching of ultra- high molecular weight polyolefin gel films, especially UHMWPE and UHMWPP. Uniaxially drawn UHMWPE gels have shown ultra-high strength comparable to its counterparts such as steel or KevlarR fibers. However, such uniaxially driven fibers are inherently weak in transverse direction due to fibrillation. The lateral strength may be significantly improved by introducing biaxial orientation in the gels. The PI will perform cross-rolling of UHMWPE gels prior to biaxial stretching to limit significant reduction of sample thickness during biaxial stretching. Another area that will be addressed is to study the mechanisms of gel drawing by probing labelled molecules. A third area that will be addressed is a study of melting and crystallization behavior of UHMWPE gels and the deformation mechanisms of gel spherulites by conventional time-resolved light scattering, SAXS, WAXD and optical microscopy.