Chain Conformation in Latex Particles and Their Diffusion During Film Formation as Characterized by Small-Angle Neutron Scattering

小角中子散射表征乳胶颗粒的链构象及其成膜过程中的扩散

• 批准号: 8512923
• 负责人: Leslie Sperling
• 金额: $ 24.1万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1985
• 资助国家: 美国
• 起止时间: 1985-11-01 至 1989-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8512923&HistoricalAwards=false
• 关键词: Chain; Conformation; Latex; Particles; Their

Paints and surface coatings are suspensions consisting of colloidal polymer particles dispersed in an aqueous phase (also called latexes). These suspensions are produced via emulsion polymerization, a heterogeneous process in which polymers grow in an oily phase into which initiators and monomers diffuse from the aqueous phase. The suspension is applied to a surface and dries, initially forming a weak latex film. After a few days these increase in strength and become tough and leathery. In this research, it will be proved that this film formation occurs because the polymer layers form monolithic colids by interdiffusion of individual chains across initial bundaries--i.e., the polymer chains, once freed from the confines of the latex, expand and try to attain their random coil configurations. Small-angle neutron scattering (SANS) is used to look at how these high molecular weight polymers behave both during their formation and during the setting stage after drying. Knowledge of this behavior can then be used to design other high strength polymers such as liquid crystals.

油漆和表面涂料是由胶体组成的悬浮液， 分散在水相中的聚合物颗粒（也称为胶乳）。 这些悬浮液是通过乳液聚合， 非均相过程，其中聚合物在油相中生长成 所述引发剂和单体从水相中扩散。 的 将悬浮液施加到表面并干燥，最初形成弱的 乳胶膜 几天后，这些力量增加，成为 坚韧的像皮革一样。 在这项研究中，将证明这部电影 因为聚合物层形成整体胶体， 各个链在初始的链间的相互扩散--即，的 聚合物链一旦从胶乳的限制中释放出来， 试图获得它们的无规卷曲结构。 小角中子 散射（SANS）是用来看看这些高分子量 聚合物在它们的形成和凝固期间都表现出 干燥后的阶段。 这种行为的知识可以用来 设计其他高强度聚合物，如液晶。