Hydrocarbon dispersions of acrylic microspheres with polar surface functionality
Hydrocarbon dispersions of acrylic microspheres with polar surface functionality
复制标题
具有极性表面官能团的丙烯酸微球的烃分散体
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
T. Jao
中科院分区：
文献类型：
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作者：
Ki;M. Winnik;T. Jao
在脂肪族碳氢化合物介质中，通过三步非水分散[NAD]聚合制备了含有交联核和极性壳的亚微米和微米级粒子。当三个阶段都使用聚(12-羟基硬脂酸)[PHS]梳状稳定剂时，生成的粒子为球形、亚微米级，且具有较宽的粒度分布。如果第三阶段的单体混合物中含有较多的丙烯酸丁酯，则可以得到尺寸为3-5μm的海绵状聚集体的稳定分散。当在种子形成步骤中使用丁基橡胶作为稳定剂前驱体时，最终粒子的形状取决于第二阶段聚合中是否使用交联剂。当交联剂存在时，第二阶段的颗粒和随后的第三阶段的颗粒具有缩小的葡萄干状外观。在不存在交联剂的情况下，得到了球形粒子。在这两种情况下，生成的第三阶段粒子都很容易分散在含有少量胺碱的水中，这表明COOH和OH基团位于这些NAD粒子的表面(或在表面的壳层中)。©1994 John Wiley&Sons，Inc.
Submicron and micron sized particles containing a crosslinked core and a polar shell were prepared by 3-stage nonaqueous dispersion [NAD] polymerization in an aliphatic hydrocarbon medium. When a poly (12-hydroxystearic acid) [PHS] comb stabilizer was used in all three stages, the particles produced were spherical, submicron in size, and had a relatively broad size distribution. If the monomer mixture in the third stage contained relatively large amounts of butyl acrylate, stable dispersions of sponge-like aggregates, 3–5 μm in size, were obtained. When butyl rubber was employed as a stabilizer precursor in the seed formation step, the shape of the final particles depended upon whether a crosslinker was employed in the second stage polymerization. When a crosslinker was present, the second-stage particles and the subsequent third-stage particles had a shrunken, raisin-like appearance. When no crosslinker was present, spherical particles were obtained. In both cases, the resulting third-stage particles were easily dispersed in water containing a small amount of amine base, indicating that COOH and OH groups are located at the surface (or in a shell at the surface) in these NAD particles. © 1994 John Wiley & Sons, Inc.