紫外辐照交联改性UHMWPE纤维的研究

Crosslinking modification of UHMWPE fiber by UV irradiation

选取不同生产阶段的超高相对分子质量聚乙烯(UHMWPE)纤维进行紫外辐照交联改性,探讨了正庚烷浸泡时间、交联剂浓度、紫外辐照时间等因素对交联效果、纤维力学性能及蠕变性能的影响。结果表明:UHMWPE纤维在正庚烷中的最佳浸泡时间为48h;紫外光最佳辐照改性时间为6min;与初生纤维和成品纤维相比,相同改性条件下冻胶纤维最易发生交联反应且效果最好;经过交联改性的UHMWPE纤维断裂强度和断裂伸长略有下降,弹性模量和抗蠕变性能有所提高。

Ultrahigh-relative molecular mass polyethylene （UHMWPE） fiber was subjected to crosslinking modification at different production stages by ultraviolet irradiation. The effects of heptane soaking time, crosslinking agent concentration and ultraviolet irradiation time on the crosslinking effect, mechanical properties and creep resistance of UHMWPE fiber were discussed. The results showed that the optimal heptane soaking time and ultraviolet irradiation time were 48 h and 6 min, respectively. As compared with as-spun fiber and finished fiber, gel fiber was most prone to crosslinking and offered the best crosslinking effect under the same modification conditions. The crosslinked UHMWPE fiber had the breaking strength and elongation at break slightly decreased and the elastic modulus and creep resistance increased somewhat：