γ射线辐照交联改性超高相对分子质量聚乙烯的研究  

Research on Ultrahigh Molecular Weight Polyethylene Crosslinked by Gamma Irradiation

作　　者：何振强[1] 薛平[1] 戚晓芸[1] 

机构地区：[1]北京化工大学机电工程学院,北京100029

出　　处：《中国塑料》2013年第7期62-67,共6页China Plastics

摘　　要：采用单螺杆挤出机制备了超高相对分子质量聚乙烯(PE-UHMW)板材,并用不同剂量的γ射线对其进行辐照交联,分析不同辐照剂量和辐照后处理对其力学性能、耐热性能、摩擦磨损性能等的影响。结果表明,在一定的辐照剂量下,γ射线辐照交联可以提高PE-UHMW的凝胶率、熔点、结晶度、拉伸强度、表面硬度、热变形温度和耐磨性能;当辐照剂量为150kGy时,PE-UHMW的热变形温度提高了近40℃;但辐照交联降低了PE-UHMW的塑性,使材料的断裂伸长率降低;重新熔融后处理可以进一步提高材料的凝胶率,改善其塑性,但材料的熔点、结晶度、表面硬度、拉伸强度有所降低。In this paper, PE-UHMW sheets were extruded using a single screw extruder and crosslinked by gamma irradiation. The effect of gamma irradiation dose on the properties of PE- UHMW was studied. With a proper dose of gamma irradiation, the gel content, melting point, crystallinity, surface hardness, tensile strength, heat distortion temperature, and wear resistance of PE-UHMW were all improved. Heat distortion temperature of PE-UHMW was increased by 40 ℃ when the gamma irradiation dose was 150 kGy. However, gamma irradiation erosslinking reduced its flexibility, the elongation at break decreased. Re-melting could further increase the gel content and enhanced its toughness, but reducing the melting point, crystallinity, surface hardness, and tensile strength.

关 键 词：超高相对分子质量聚乙烯 辐照交联 耐热 耐磨 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]