超临界CO_2预处理对UHMWPE纤维电子束辐照效果的影响

采用正交试验,研究了超临界CO_2预处理工艺(压力、温度、时间)对辐敏剂三羟甲基丙烷三甲基丙烯酸酯(TMPTMA)渗入率及超高相对分子质量聚乙烯(UHMWPE)纤维凝胶含量和蠕变率的影响,并利用Minitab软件分析UHMWPE纤维凝胶含量和蠕变率与TMPTMA渗入率之间的关系,最后通过对UHMWPE纤维各项性能的测定,进一步优化超临界CO_2预处理工艺。研究结果表明:处理温度对TMPTMA的渗入率及UHMWPE纤维凝胶含量和蠕变率影响最大,其次为压力,时间的影响最小;确定了最佳工艺为处理压力30 MPa、温度80℃、时间50 min;TMPTMA渗入率是引起各个影响因素不同水平之间凝胶含量和蠕变率出现差别的重要因素;超临界CO_2预处理对UHMWPE纤维的辐照交联起到了重要的促进作用,使其抗蠕变性能得到很大程度的改善。

Influence of Supercritical CO_2 Pretreatment on the Effects of UHMWPE Fibers Irradiated by Electron Beam

The influence of supercritical carbon dioxide pretreatment process(pressure,temperature,time)on the infiltration rate of trimethylolpropane trimethacrylate(TMPTMA),the gel content and creep rate of ultra-high molecular weight polyethylene(UHMWPE) fibers were studied with orthogonal experiment.The relationships between gel content and infiltration rate,creep rate and infiltration rate were analysed by using Minitab software,then the properties of UHMWPE fibers were tested to optimize supercritical CO_2 pretreatment process further.The results indicated that the processing temperature had the most significant effect on the infiltration rate of TMPTMA,the gel content and creep rate of UHMWPE fibers,followed by pressure,time had the minimal effect.The optimum process was processing pressure 30 MPa,80℃ and 50 min.The infiltration rate of TMPTMA was an important factor to cause the differences of gel content and creep rate between different levels of various factors.Supercritical CO_2 pretreatment played an important role in promoting irradiation cross-linking of UHMWPE fibers,and the anti-creep properly was greatly improved.