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	PREPARATION OF PS/CaCO3 COMPOSITE NANOPARTICLES AND PS HOLLOW NANO-SPHERES
	Liu Wenfang ; Guo Zhaoxia ; Yu Jian
	2010-10-12 ; 2010-10-12
关键词	Polystyrene Nanometer CaCO3 Composite particles Hollow nano-sphere Etching POLYMER CAPSULES CORE ENCAPSULATION NANOSPHERES COPOLYMERS TEMPLATES PARTICLES EMULSION ROUTE Polymer Science
中文摘要	Surface-grafted or cross-linked polystyrene(PS) /CaCO3 composite nanoparticles with nanometer CaCO3 as the core were synthesized by in situ emulsion polymerization. Subsequently, PS hollow nano-spheres were prepared by etching the core with dilute hydrochloric acid. The effects of the type and amount of emulsifier, the addition method of initiator and the feeding interval on emulsion stability,the yield and grafting efficiency were investigated. Composition and morphology of composite nanoparticles before and after etching were characterized by TGA, FT-IR and TEM. The results show that cationic emulsifier is in favor of the stability of emulsion system,and a higher yield and grafting efficiency can be achieved when using 3.7% similar to 5.5 % cetyltrimethylammonium bromide (CTAB) as the emulsifier. With the amount of CTAB increased the size of composite nanoparticles becomes smaller and the size distribution becomes broader. 2, 2'-azobisisobatyronitrile (AIBN), the initiator, should avoid ultrasonic treatment along with monomers and CaCO3 particles, which may induce irreversible agglomeration. With the feeding interval prolonged, the yield and grafting efficiency decrease, and one-pot method contributes to obtain composite nanoparticles with higher yield and grafting efficiency (or cross-linked degree). Although hollow particles can be prepared from either surface-grafted or cross-linked PS/CaCO3 composite particles by etching, the latter with crosslinked polymer shell have rather better size and shape stability and can retain their sphere shape after etching.
语种	中文 ; 中文
出版者	SCIENCE CHINA PRESS ; BEIJING ; 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79563]
专题	清华大学
推荐引用方式 GB/T 7714	Liu Wenfang,Guo Zhaoxia,Yu Jian. PREPARATION OF PS/CaCO3 COMPOSITE NANOPARTICLES AND PS HOLLOW NANO-SPHERES[J],2010, 2010.
APA	Liu Wenfang,Guo Zhaoxia,&Yu Jian.(2010).PREPARATION OF PS/CaCO3 COMPOSITE NANOPARTICLES AND PS HOLLOW NANO-SPHERES..
MLA	Liu Wenfang,et al."PREPARATION OF PS/CaCO3 COMPOSITE NANOPARTICLES AND PS HOLLOW NANO-SPHERES".(2010).

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