Improving the creep resistance and tensile property of UHMWPE sheet by radiation cross-linking and annealing
Improving the creep resistance and tensile property of UHMWPE sheet by radiation cross-linking and annealing
复制标题
通过辐射交联和退火提高UHMWPE片材的抗蠕变性和拉伸性能
DOI：
10.1016/j.radphyschem.2016.03.009
复制
发表时间：
2016-08-01
影响因子：
2.9
通讯作者：
Wu, Guozhong
中科院分区：
文献类型：
--
作者：
Wang, Honglong;Xu, Lu;Wu, Guozhong
超高分子量聚乙烯（UHMWPE）片材通过在空气中以高达300 kGy的剂量以5 kGy/h的剂量率进行γ辐照而交联，并通过在真空中在120 ℃下后退火4 h而进一步处理。化学结构，热稳定性，结晶度，抗蠕变性和拉伸性能的变化进行了研究和比较，主要通过凝胶含量TGA，DSC，蠕变和拉伸测量。凝胶含量的测量表明，交联是占主导地位的断链过程中照射和退火后。辐射交联使UHMWPE的抗蠕变性能和拉伸性能得到明显改善。通过交联，在300 kGy的剂量下，辐照和随后退火的UHMWPE片材的操作温度和屈服强度分别提高了100 ℃和14%以上。同时，与原始UHMWPE的398 MPa相比，杨氏模量增加到1413 MPa。辐照后退火进一步提高了抗蠕变性和杨氏模量。高度交联的UHMWPE甚至可以在250摄氏度下长时间保持不发生任何明显变形。(C)2016爱思唯尔有限公司版权所有
Ultra-high molecular weight polyethylene (UHMWPE) sheet was cross-linked by gamma irradiation in air with a dose of up to 300 kGy at a dose rate of 5 kGy/h and further treated by post-annealing at 120 degrees C for 4 h in vacuum. Variations in chemical structure, thermostability, crystallinity, creep resistance, and tensile properties were investigated and compared mainly by gel content TGA, DSC, and creep and tensile measurements. Gel content measurements indicated that cross-linking was predominant over chain scission during irradiation and post-annealing. Radiation cross-linking resulted in an obvious improvement in the creep resistance and tensile properties of UHMWPE. Through cross-linking, the operational temperature and yield strength of the irradiated and subsequently annealed UHMWPE sheet were improved by more than 100 degrees C and 14%, respectively, at a dose of 300 kGy. Simultaneously, Young's modulus was increased to 1413 MPa, compared with 398 MPa of pristine UHMWPE. Annealing after irradiation further improved the creep resistance and Young's modulus. Highly cross-linked UHMWPE can even be maintained at 250 degrees C for a long time without any obvious deformation. (C) 2016 Elsevier Ltd. All rights reserved.