A quaternary ammonium salt (QAS),Methacryloxylethyl benzyl dimethyl ammonium chloride, was introduced onto the surface of PE films by UV photografting technique.The photografted films were characterized by FTIR,XPS an...A quaternary ammonium salt (QAS),Methacryloxylethyl benzyl dimethyl ammonium chloride, was introduced onto the surface of PE films by UV photografting technique.The photografted films were characterized by FTIR,XPS and SEM.Morphology of the grafted layers were studied and was found to change with th UV Light irradiation time.The PE film surfaces were uniformly covered with the QAS moieties and the thickness was about several μm.A clear boundary between the grafted layer and the substrate surface was also observed.展开更多
讨论了水性体系中经紫外光引发在PP膜表面的丙烯酸接枝聚合反应的实验影响因素,考察了光敏剂、单体浓度、光照时间以及反应温度对接枝率的影响.红外光谱证明了AA接枝到了PP表面,在一定范围内,接枝率随时间和温度的增加而增加,在光照7 m...讨论了水性体系中经紫外光引发在PP膜表面的丙烯酸接枝聚合反应的实验影响因素,考察了光敏剂、单体浓度、光照时间以及反应温度对接枝率的影响.红外光谱证明了AA接枝到了PP表面,在一定范围内,接枝率随时间和温度的增加而增加,在光照7 m in、温度在60℃时达到最大值.展开更多
采用紫外光接枝的方法在含有光敏性基团的聚丙烯腈超滤膜上接枝了N-异丙基丙烯酰胺(NIPAAm),提出一种制备温敏型分离膜的新方法。采用红外光谱分析和扫描电子显微镜测试技术证明了改性膜表面及膜孔内部PNIPAAm接枝链的存在。当接枝单体N...采用紫外光接枝的方法在含有光敏性基团的聚丙烯腈超滤膜上接枝了N-异丙基丙烯酰胺(NIPAAm),提出一种制备温敏型分离膜的新方法。采用红外光谱分析和扫描电子显微镜测试技术证明了改性膜表面及膜孔内部PNIPAAm接枝链的存在。当接枝单体NIPAAm浓度为0.4 mol/L时,接枝率出现最大值,达到4.89%;接枝率随着接枝反应温度和时间的增加而增大,但是较高的反应温度(>35℃)和较长的辐照时间(>15 m in)会减缓接枝率的增加。接枝膜的亲水性随接枝率的增大而明显增加。展开更多
文摘A quaternary ammonium salt (QAS),Methacryloxylethyl benzyl dimethyl ammonium chloride, was introduced onto the surface of PE films by UV photografting technique.The photografted films were characterized by FTIR,XPS and SEM.Morphology of the grafted layers were studied and was found to change with th UV Light irradiation time.The PE film surfaces were uniformly covered with the QAS moieties and the thickness was about several μm.A clear boundary between the grafted layer and the substrate surface was also observed.
文摘采用紫外光接枝的方法在含有光敏性基团的聚丙烯腈超滤膜上接枝了N-异丙基丙烯酰胺(NIPAAm),提出一种制备温敏型分离膜的新方法。采用红外光谱分析和扫描电子显微镜测试技术证明了改性膜表面及膜孔内部PNIPAAm接枝链的存在。当接枝单体NIPAAm浓度为0.4 mol/L时,接枝率出现最大值,达到4.89%;接枝率随着接枝反应温度和时间的增加而增大,但是较高的反应温度(>35℃)和较长的辐照时间(>15 m in)会减缓接枝率的增加。接枝膜的亲水性随接枝率的增大而明显增加。