电子束辐射接枝丙烯酸改性聚四氟乙烯

Electron beam radiation grafting acrylic acid modified polytetrafluoroethylene

采用电子束辐射接枝工艺,在保持本体强度的前提下实现了对聚四氟乙烯(PTFE)板材的表面丙烯酸接枝改性。傅里叶变换红外扫描测试表明丙烯酸成功接枝到PTFE板材表面。通过单因素分析法研究了辐射接枝工艺参数对接枝量的影响,并择优选出最佳的辐射接枝工艺条件:吸收剂量为18 kGy,丙烯酸浓度为60%,反应温度为70℃。表面接触角测试表明,接枝改性后PTFE板材表面浸润性较改性前大幅提高,水接触角由120°下降到60°。黏接性能测试结果表明,辐射接枝改性可显著提高PTFE的黏接强度,达到23 N/cm^(2)。

The surface of polytetrafluoroethylene(PTFE)was modified by electron beam-induced grafting of acrylic acid.The change of related groups in Fourier-transform infrared spectrum indicated that acrylic acid was introduced on the PTFE surface.The influence of irradiation and grafting parameters on the extent of grafting were studied by single factor analysis,and the following optimal radiation-induced grafting conditions were determined:absorbed dose of 18 kGy,acrylic acid solution concentration of 60%,and reaction temperature of 70℃.Moreover,the surface water contact angle test showed that the surface wettability of PTFE after modification by radiation induced grafting improved compared with that before modification(the water contact angle dropped from 120°to 60°).The bond strength of the modified PTFE reached 23 N/cm^(2).