γ射线辐照对超高分子量聚乙烯结构与流动性能的影响  

Effect of γ-ray irradiation on the structure and melt fluidity of UHMWPE

作　　者：刘鹏波[1] 范萍[1] 徐闻[1] 王楷[1] 

机构地区：[1]四川大学高分子研究所高分子材料工程国家重点实验室,成都610065

出　　处：《辐射研究与辐射工艺学报》2005年第4期207-210,共4页Journal of Radiation Research and Radiation Processing

基　　金：国家重点基础研究专项经费(G1999064809)资助

摘　　要：采用γ射线在室温、空气条件下对超高分子量聚乙烯进行辐照,采用傅立叶红外光谱、差式扫描量热法、特性粘度测定、熔体流动速率测定以及力学性能测试等手段研究了γ射线辐照对超高分子量聚乙烯(Ultra?highmolecularweightpolyethylene,UHMWPE)结构、流动性能以及力学性能的影响。研究结果表明,在室温下和空气中,通过γ射线辐照可在超高分子量聚乙烯分子链上引入含氧极性基团;UHMWPE经过γ射线辐照以后分子链发生降解,熔体流动速率增大,流动性得到改善;在一定辐照剂量范围内,γ射线辐照使UHMWPE的拉伸屈服强度及断裂伸长率增加,缺口冲击强度下降。Ultra-high molecular weight polyethylene （UHMWPE） was irradiated in air by ^60Co γ-rays. The effect of γ-ray irradiation on the structure and properties of UHMWPE was studied by FTIR, intrinsic viscosity measurement, melt flow rate （MFR） measurement and mechanical property test. The experimental results show that oxygen-containing groups （mainly carbonyl group） were introduced on the molecular chain of UHMWPE during the irradiation, which causeed degradation of UHMWPE. Molecular weight of UHMWPE decreased and melt flow rate increased obviously. Compared with the virgin UHMWPE, MFR of the 100 kGy-irradiated UHMWPE increased from virtually nothing to 4.8 g/10 min. Tensile yield strength and elongation at break of the irradiated UHMWPE samples were improved, whereas notched lzod impact strength of the samples decreased. Compared with the virgin UHMWPE, elongation at break of the UHMWPE samples irradiated to 100 kGy increased from 367 % to 801%, and their notched lzod impact strength decreased to 576 J /m from over 1000.

关 键 词：超高分子量聚乙烯 Γ射线辐照 流动性 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]