超高分子量聚乙烯纤维表面紫外接枝聚合改性研究

Surface modification of ultra high molecular weight polyethylene fibers via the UV-induced graft polymerization

以二苯甲酮(BP)为引发剂,采用新型二步紫外接枝法在超高分子量聚乙烯(UHMWPE)纤维表面接枝了丙烯酸(AA)、甲基丙烯酸(MAA)等活性单体,利用全反射傅里叶变换红外光谱(ATR-IR)、电子显微镜(SEM)分析证明了接枝层的存在,此外还通过紫外吸收光谱(UV)、全反射傅里叶变换红外光谱(ATR-IR)、热裂解色谱质谱分析(Py-GC-MS)对反应机理进行了分析。探索了接枝条件对接枝率的影响,接枝改性后的超高分子量聚乙烯纤维的粘结性能和亲水性能大大提升,其中界面剪切强度提升160.9%,水接触角从112.0°下降为67.88°。

In this work, active monomers such as acrylic acid and methacrylic acid were grafted onto the surface of ultra high molecular weight polyethylene （UHMWPE） fibers via a two step UV--induced photografting polymerization. Benzophenone was selected as the photo sensitizer in the photo grafting. Attenuated total reflectance infrared spectroscopy （ATR IR） confirmed the grafting, and scanning electron microscopy （SEM） images revealed the apparent morphology changing of the grated fibers. The effects of the monomer concentration and the reaction time on the grafting degree （GD） were studied by the gravimetric analysis. The mechanism of reaction was also studied by UV-VIS spectrum, attenuated to tal reflectance infrared spectroscopy （ATR-IR） and pyrolysis-gas chromatography/mass spectrometry （Py C/C/MS）. Interfacial shear stress （IFSS） test of the modified UHMWPE fibers showed an extensively improved interfacial bonding proper ty （from 0. 686MPa to 1. 790MPa）, and the hydrophilic nature of UHMWPE fibers was also improved （from 112. 0°to 67. 88°）.