双向同性自增强UHMWPE板材的制备

Preparation of Bi-directional Isotropic Self Strengthening UHMWPE Plate

在室温条件下,对超高分子量聚乙烯(UHMWPE)模压板双向辊压,以实现双向自增强。探究了双向均匀提升模压板性能的技术可行性,考察了辊压比对模压板球晶形变的影响以及自增强板材聚集态结构与其力学性能的关联性。结果表明,辊压使原模压板约71.2 nm的球晶细化至39.4 nm的微晶,结晶度从45.2%降至40.2%,部分正交晶系转变为单斜晶系。辊压比达36.6%的自增强板材,两个方向的拉伸强度分别达到了62、60 MPa。

At room temperature conditions,molded plates of ultra-high molecular weight polyethylene(UHMWPE)was formed by bi-directional rolling to achieve bi-directional self-reinforced samples,and the technical feasibility of bi-directional uniform improvement of the performance of molded plates was explored,and the influence of rolling ratios on the spherulite deformation of molded plates was investigated,as well as the correlation between the aggregated structure of self-reinforced plates and their mechanical properties.The results show that rolling refines the mean spherulites size of the original molded plate from 71.2 nm to microcrystals of 39.4 nm,and the crystallinity decreases from 45.2%to 40.2%.Some orthogonal crystal systems transform into monoclinic crystal systems.The self-reinforced sheet with a rolling ratio of 36.6%achieves tensile strength of 62 MPa and 60 MPa in both directions,respectively.