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通过研究低密度聚乙烯 (LDPE)表面光接枝前后对水静态接触角的变化 ,探讨了两步法光接枝丙烯酸表面改性的基本规律 ,并讨论了光照条件、光敏剂含量、单体种类等因素对表面改性效果的影响。结果表明 ,随着接枝量的上升 ,LDPE表面对水的接触角逐渐下降 ,达一定值后则变化不大 ;滤掉远紫外光后表面改性效果大大减弱 ;适当的光敏剂含量和单体浓度对表面改性比较有利 ,过高过低都不好 ;较丙烯酸而言 ,丙烯酰胺的表面改性效果稍好 ,而甲基丙烯酸、丙烯酸甲酯则较差 ;相对于两步法而言 ,一步法在适当的光敏剂浓度下 ,从正面光照也能获得很好的表面改性效果 ,而从背面光照的效果则普遍不好。
The basic law of the surface modification of acrylic acid by two-step method was discussed by studying the change of static contact angle with water before and after photo-grafting on low-density polyethylene (LDPE) surface. The effects of illumination conditions, photosensitizer content, monomer type And other factors on the surface modification effect. The results showed that the contact angle of LDPE with water gradually decreased with the increase of the amount of grafting, but little changed after reaching a certain value. The effect of surface modification was greatly weakened after filtering out far ultraviolet light. The suitable photosensitizer content and single Body concentration is more favorable for the surface modification, too high and too low is not good; compared with acrylic acid, acrylamide surface modification slightly better, and methacrylic acid, methyl acrylate is poor; compared with the two-step method Say, one-step method at the appropriate photosensitizer concentration, from the positive light can get a good surface modification, while the effect from the back of the light is generally not good.