摘要
以聚氧乙烯为起始原料,合成了一系列硬脂酸聚氧乙烯酯及其丙烯酸酯,用FTIR和1H NMR测试技术对其结构进行了表征,用最大气泡法测定了其表面张力.以其作为接枝单体,利用反应挤出接枝方法制备了系列功能化聚乙烯,用FTIR确定了接枝共聚物的结构和接枝率;用DSC、接触角测量仪对接枝共聚物的热性能、结晶行为和表面性质进行了测试分析。结果表明,含有不同分子量(200、600、1 000、2 000和6 000)聚氧乙烯的硬脂酸聚氧乙烯酯的表面张力分别为30.19、32.22、35.30、38.39和43.37 mN/m;相应的聚乙烯接枝共聚物的结晶温度分别为109.30、109.08、110.18、109.74和109.74℃,水接触角分别为81.06°、70.10°、72.25°、76.40°和95.55°。随着聚氧乙烯分子量的增加,表面活性剂的表面活性降低;聚乙烯接枝共聚物的结晶温度高于线形低密度聚乙烯(LLDPE,Tc=104.95℃),且其亲水性得到改善(纯聚乙烯的水接触角103°)。
A series of surfactants,a,b,c,d,e and their acrylates,A,B,C,D and E,were synthesized with poly（ethylene oxide）（PEO）（Mw：200,600,1 000,2 000,6 000） and sterate chloride as the main starting materials.Their chemical structures were characterized by means of FTIR and 1H NMR.The surface activity and surface tension（γ） of surfactants a,b,c,d and e were evaluated by maximum bubble pressure method.Surfactants A,B,C,D and E were adopted as the grafting monomers of linear low density poly-ethylene（LLDPE）,and grafting reaction was carried out via melt reactive extrusion procedure.Their surface properties were characterized with measuring contact angle.The surface tensions of sterates containing PEO with different molecular mass are individually 30.19,32.22,35.30,38.39 and 43.37 mN/m.The contact angles are individually 81.06°,70.10°,72.25°,76.40° and 95.55°.Thermal properties of grafted copo-lymers were studied by DSC.The crystalline temperatures of grafted copolymers are individually 109.30 ℃,109.08 ℃,110.18 ℃,109.74 ℃ and 109.74 ℃.The surface tension was found to increase with the length of PEO and the hydrophilic property of the grafted copolymers was better than that of pure LLDPE（103°）.The crystalline temperatures of grafted copolymers were higher than that of pure LLDPE（104.95 ℃）.
出处
《应用化学》
CAS
CSCD
北大核心
2009年第4期378-382,共5页
Chinese Journal of Applied Chemistry
基金
山东省自然基金(Y2006B32)
中国博士后基金(20070411091)
山东省博士后创新项目专项基金(200703058)资助项目
