共查询到18条相似文献,搜索用时 140 毫秒
1.
2.
核壳型硅丙复合乳液的合成及其性能研究 总被引:4,自引:1,他引:4
用单体预乳化法和半连续种子乳液聚合法合成了核壳型硅丙复合乳液,研究了壬基酚聚氧乙烯醚-2-磺酸基琥珀酸单酯二钠盐(MS-1)与十二烷基硫酸钠(SDS)复配比例、核层聚合乳化剂补加速率及壳层聚合乳化剂补加速率对乳液性能和乳胶粒粒径及其分布的影响。考察了复配乳化剂用量对单体转化率、涂膜耐水性的影响规律。结果表明,所合成的系列乳液中,复配乳化剂所合成乳液的乳胶粒粒径小,粒径最小为72.99nm,乳液黏度大,其最大值为60.0mPa.s;而采用MS-1单一乳化剂所合成乳液的乳胶粒粒径分布最窄,其多分散性指数(PDI)为0.01,乳液黏度最小,其值为37.78mPa.s。当核层和壳层聚合乳化剂持续补加时间分别为120min和210min时,聚合体系乳胶粒数目基本保持不变,后续加入的单体在种子乳胶粒表面进行聚合,形成"核壳"结构。此外,随着乳化剂用量增加,单体的转化率提高但涂膜的耐水性下降。并用红外、透射电镜分别对聚合物分子链结构和乳胶粒形貌结构进行了表征。 相似文献
3.
4.
5.
有机硅/丙烯酸酯共聚复合乳液结构形态的研究 总被引:1,自引:0,他引:1
利用红外光谱及扫描电镜对合成的有机硅-丙烯酸酯共聚复合乳液的化学结构、粒子形态进行了研究.结果表明:所合成的有机硅一丙烯酸酯复合乳液为具有核壳形态结构的新型乳胶液,其核/壳间存在化学键合.与纯丙乳液和硅-丙共聚乳液相比,核壳型复合乳胶膜在耐水性方面有显著提高. 相似文献
6.
7.
采用核-壳乳液聚合法合成了各以硬、软单体为壳的可剥离丙烯酸酯乳液.研究了壳层单体性质及用量对乳液涂膜力学性能、成膜性能、水接触角及吸水率等的影响,利用TEM观察了乳胶粒的形貌和尺寸,并运用DSC考察了该核-壳结构聚合物的玻璃化温度.结果表明:合成的乳胶粒大小较为均一,具有核-壳结构;以硬单体为壳的涂膜拉伸强度较高,附着... 相似文献
8.
9.
10.
11.
12.
13.
14.
15.
The mechanism for the formation of amphiphilic core-shell particles in water is elucidated via a kinetic study of semi-batch polymerization of methyl methacrylate (MMA) grafted from polyethylenimine (PEI) initiated with tert-butyl hydroperoxide in an emulsion polymerization. The monomer conversion, the polymerization kinetics, the particle size, the particle number density, the poly(methyl methacrylate) (PMMA) core diameter, the percentage of unbound PEI, and the grafting efficiency of PMMA were determined at various times during the polymerization. The particle number density and the percentage of unbound PEI were almost independent of the controllable variables. The particle sizes and the core diameters increased with each consecutive batch of monomer addition, while the grafting efficiency of PMMA decreased. These data supported the hypothesis that the PEI-g-PMMA graft copolymers were formed early in the polymerization and later self-assembled to a new phase, micellar microdomains. These microdomains act as loci for subsequent MMA polymerization as the monomer is fed into the reaction, without subsequent formation of new particles. The size of the resulting highly uniform core-shell particles (99-147 nm) can be controlled by choosing the amount of monomer charged. Thus, this polymerization method is viable for a large scale production of core-shell particles with high solids content. 相似文献
16.
水性含氟耐候防锈涂料的制备及应用 总被引:1,自引:0,他引:1
采用核壳乳液聚合法,并加入磷酸酯功能单体(PAM-100),制备了氟单体用量为5%的含氟丙烯酸酯聚合物乳液。分析了含氟单体、乳化剂、磷酸酯功能单体等因素对乳液合成的影响。用合成的乳液配制了水性防锈涂料,并对其性能进行测试。 相似文献
17.