QQ客服 官方微博 反馈留言

	Photoinduced aggregation of polymer nanoparticles in a dilute nonaqueous dispersion
	Zhao Y(赵仪)
	2002
关键词	1,4-BUTANEDIOL DIGLYCIDYL ETHER LASER-LIGHT-SCATTERING LIMITED AGGREGATION CIS-1,2-CYCLOHEXANEDICARBOXYLIC ANHYDRIDE EPOXY POLYMERIZATION FRACTAL AGGREGATION KINETICS UNIVERSALITY DIMENSION STABILITY
英文摘要	We describe the photoinduced flocculation of a nonaqueous dispersion of core-shell nanoparticles (diameter = 50 nm). The particles consist of a tightly cross-linked core composed of poly(butyl methacrylate-co-ethylene glycol dimethacrylate) and a lightly cross-linked shell of poly(butyl methacrylate-co-ethylene glycol dimethacrylate-co-methacrylic acid). After converting the acid groups in the shell to 1-phenylketo-2-octadecyl ester groups, the particles could be dispersed in cyclohexane, sterically stabilized by the alkyl substituents of these ester groups. Photocleavage of these substituents (lambda = 310 nm) regenerated the -COOH groups and led to slow aggregation of the destabilized particles. This system allowed us to study the process of particle aggregation kinetics in the absence of long-range electrostatic interaction by using a combination of static and dynamic laser light scattering. Our results show that there exist two stages in the aggregation process. Initially, several particles come into contact to form small, elongated clusters. Subsequently, these clusters undergo further aggregation to form larger aggregates characterized by a fractal dimension of 2.3. Our results indicate that aggregation in the second stage follows a reaction-limited cluster-cluster aggregation mechanism. We also found that the average radius of gyration during aggregation scaled with time with an exponent of 1.4+/-0.1, much higher than predicted and found in previous experiments.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/63524]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Zhao Y. Photoinduced aggregation of polymer nanoparticles in a dilute nonaqueous dispersion[J],2002.
APA	赵仪.(2002).Photoinduced aggregation of polymer nanoparticles in a dilute nonaqueous dispersion..
MLA	赵仪."Photoinduced aggregation of polymer nanoparticles in a dilute nonaqueous dispersion".(2002).

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。