论文部分内容阅读
利用悬浮聚合法,首次以乙丙共聚物和甲苯为共致孔剂制备了具有高比表面积、孔连通性良好的聚二乙烯基苯(PDVB)微球.通过改变共致孔剂中乙丙共聚物的用量研究其对微球孔结构的影响.用扫描电镜观察了微球的表面形貌,氮气吸脱附和压汞法表征了微球的孔结构参数及孔径分布曲线.结果表明该共致孔剂中PEP的用量达到2.0%时,可诱导PDVB发生双相分离,其中,与基体不相容的PEP诱导第一次早期的相分离,而与基体相容的甲苯则诱导了第二次晚期的相分离.双相分离对微球的孔连通性、比表面积、孔体积和平均孔径等结构参数均有一定的影响.总的来说,为可控制备具有可控孔结构的聚合物微球提供了一条新的技术路线.
Polyvinylidene dimethacrylate (PDVB) microspheres with high specific surface area and good pore connectivity were prepared by suspension polymerization for the first time with ethylene-propylene copolymer and toluene as co-porogen. The amount of copolymer was used to study the microstructure of the microspheres.The surface morphology of microspheres was observed by scanning electron microscopy and the pore structure parameters and pore size distribution curve were characterized by nitrogen adsorption and mercury intrusion porosimetry.The results showed that the total Biphasic separation of PDVB can be induced when the amount of PEP in the porogen reaches 2.0%, where PEP, which is incompatible with the matrix, induces the first early phase separation while the matrix compatible toluene induces the second Second-phase phase separation.Bi-phase separation on the microsphere pore connectivity, specific surface area, pore volume and average pore size and other structural parameters have a certain impact.In general, the controlled preparation of controlled pore structure of the polymerization Microspheres provide a new technological route.