Pore structural studies of monodisperse porous polymer particles
Pore structural studies of monodisperse porous polymer particles
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DOI：
10.1016/0021-9797(92)90223-9
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发表时间：
1992-05
影响因子：
9.9
通讯作者：
C. Cheng;F. Micăle;J. Vanderhoff;M. El-Aasser
中科院分区：
文献类型：
--
作者：
C. Cheng;F. Micăle;J. Vanderhoff;M. El-Aasser
以分子量约为106的单分散聚苯乙烯乳胶粒为惰性稀释剂，采用种子乳液聚合法制备了单分散多孔苯乙烯-二乙烯基苯共聚物粒子。用压汞法和氮气吸附-脱附等温线来评估孔结构和孔径分布。孔径分布对用作惰性稀释剂的聚苯乙烯胶乳颗粒的分子量非常敏感。来自所用技术的定性证据表明，单分散多孔聚合物颗粒本质上是大孔的（平均孔径> 500 μ m）。随着线性聚合物的分子量降低，聚合物颗粒的多孔结构在大孔/中孔结构的范围内变化复杂。扫描电子显微镜结果表明，在多孔聚合物颗粒内的微球和它们的团聚体之间存在空隙，并且氮气吸附等温线证实，孔是由于这些交联的微球和团聚体之间的空隙。
Monodisperse polystyrene latex particles with molecular weight on the order of 106were used as inert diluents for the preparation of monodisperse porous styrene-divinylbenzene copolymer particles via seeded emulsion polymerization techniques. Mercury porosimetry and nitrogen adsorption-desorption isotherms were used to assess pore structure and pore size distribution. Pore size distribution was very sensitive to the molecular weight of the polystyrene latex particles used as inert diluent. Qualitative evidence from the techniques used indicated that the monodisperse porous polymer particles were macroporous (average pore diameter > 500 Å) in nature. As the molecular weight of the linear polymer decreased, the porous structure of the polymer particles ranged in complexity across the spectrum of macro/mesopore structures. Scanning electron microscope results indicated the existence of voids between the microspheres and their agglomerates within the porous polymer particle, and nitrogen adsorption isotherms confirmed that the pores were due to interstices between these crosslinked microspheres and agglomerates.