QQ客服 官方微博 反馈留言

	PS/CaCO_3复合纳米粒子及PS纳米空心球的制备研究
	刘文芳 ; 郭朝霞 ; 于建 ; LIU Wenfang ; GUO Zhaoxia ; YU Jian
	2010-06-10 ; 2010-06-10
关键词	聚苯乙烯 纳米碳酸钙 复合粒子 纳米空心球 刻蚀 Polystyrene,Nanometer CaCO_3,Composite particles,Hollow nano-sphere,Etching TB383.1
其他题名	PREPARATION OF PS/CaCO_3 COMPOSITE NANOPARTICLES AND PS HOLLOW NANO-SPHERES
中文摘要	以CaCO3为核,采用原位乳液聚合法合成了表面接枝型和交联型PS/CaCO3复合纳米粒子,然后用稀盐酸刻蚀,得到PS纳米空心球.考察了乳化剂类型和用量、引发剂加入方式、加料间隔对乳液稳定性以及复合粒子收率、PS接枝效率的影响,并采用TGA、FT-IR和TEM等手段对刻蚀前后粒子的组成及形貌进行了表征.结果表明,阳离子型乳化剂更有利于乳液体系的稳定性;CTAB用量为3.7%~5.5%时,可获得较高的收率和接枝效率,随CTAB用量增加,粒径减小,分布变宽;AIBN应避免和单体、CaCO3粒子一起超声波处理,否则会导致不可逆凝聚;随着加料间隔延长,收率和接枝效率下降,一步加料法可获得具有高收率和高接枝效率(或交联程度)的复合粒子;经刻蚀,两种类型的复合粒子均可以制得空心粒子,但经过交联的聚合物外壳具有更好的尺寸和形状稳定性,刻蚀后仍然能保持球状的外形.; Surface-grafted or cross-linked polystyrene(PS)/CaCO_3 composite nanoparticles with nanometer CaCO_3 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% ～ 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 CaCO_3 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/CaCO_3 composite particles by etching,the latter with cross-linked polymer shell have rather better size and shape stability and can retain their sphere shape after etching.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/64505]
专题	清华大学
推荐引用方式 GB/T 7714	刘文芳,郭朝霞,于建,等. PS/CaCO_3复合纳米粒子及PS纳米空心球的制备研究[J],2010, 2010.
APA	刘文芳,郭朝霞,于建,LIU Wenfang,GUO Zhaoxia,&YU Jian.(2010).PS/CaCO_3复合纳米粒子及PS纳米空心球的制备研究..
MLA	刘文芳,et al."PS/CaCO_3复合纳米粒子及PS纳米空心球的制备研究".(2010).

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。