Biaxial Stretching of Ultrahigh Strength Polyolefinic Gel Films UHMWPE and UHMWPP

超高分子量聚乙烯（UHMPVPE）和聚丙烯（UHMWPP）聚合物凝胶纤维，如果取向正确，可以产生与一些最坚固的材料（如钢和碳纤维）相媲美的良好机械性能。凝胶UHMWPE纤维在纵向上表现出较高的强度，但在横向上强度有限。为了提高尺寸稳定性和实现均匀的机械强度，纤维的双轴取向和交联的组合正在进行中。这项基础性的实验研究完成后，有望在航空航天和海洋应用中找到凝胶UHMWPE纤维的更广泛用途。

Ultrahigh molecular weight polyethylene (UHMPVPE) and polypropylene (UHMWPP) polymer gel fibers, if properly oriented, can yield good mechanical properties comparable to some of the strongest materials such as steels and carbon fibers. The gel UHMWPE fibers show high strength in the longitudinal direction but their strength in the lateral direction is somewhat limited. To improve dimensional stability and achieve uniform mechanical strength, a combination of biaxial orientation and cross-linking of the fibers is underway. This fundamental, experimental study, when completed, is expected to find a broader use of gel UHMWPE fibers in aerospace and marine applications.