受限空间内聚苯乙烯微粒的制备

doi:10.6023/A1112021

化学学报 ›› 2012, Vol. 70 ›› Issue (9): 1047-1054.DOI: 10.6023/A1112021 下一篇

研究论文

受限空间内聚苯乙烯微粒的制备

王晓蜂, 袁荞龙

华东理工大学材料科学与工程学院上海市先进聚合物材料重点实验室上海 200237

投稿日期:2011-12-02 修回日期:2012-02-21 发布日期:2012-05-18
通讯作者: 袁荞龙 E-mail:qlyuan@ecust.edu.cn
基金资助:
上海市重点学科(No. B502)和上海市重点实验室(No. 08DZ2230500)资助项目.

Preparation of Polystyrene Nanospheres in Confined Space

Wang Xiaofeng, Yuan Qiaolong

Key laboratory of Shanghai Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237

Received:2011-12-02 Revised:2012-02-21 Published:2012-05-18
Supported by:
Project supported by Shanghai Leading Academic Discipline Project (No. B502) and Shanghai Key Laboratory Project (No. 08DZ2230500).

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摘要/Abstract

以(N,N-二甲氨基-4-吡啶)五氰合铁(II)封端的聚氧丙烯聚氧乙烯共聚物(EPE-Fe)与苯乙烯在水中自组装形成纳米体系(EPE-Fe-St), 在纳米尺度受限空间内进行了苯乙烯自由基聚合, 制备了聚苯乙烯微球(EPE-Fe-PS). 用Fe³⁺对自组装体系的纳米球壳进行固化后形成Fe-EPE-Fe-St 体系, 聚合后也制备了聚苯乙烯微球(Fe-EPE-Fe-PS). 研究结果表明,制备了粒径为60～200 nm 的不同粒径单分散聚苯乙烯微球, 聚合温度对纳米Fe-EPE-Fe-St 体系粒径影响较小, 而对EPE-Fe-St 体系较大. 在受限空间内苯乙烯的自由基聚合可得到数均分子量超过70 万的聚苯乙烯; 自组装体系中引发剂量增多使聚苯乙烯分子量下降, 聚合温度上升也使分子量下降, 而增加自组装的EPE-Fe 用量可增加聚苯乙烯的分子量. 两种受限条件下的聚苯乙烯微球的玻璃化转变温度(T_g)在90～135 ℃之间, 纳米反应器壳层的硬化提高了聚苯乙烯微球的T_g.

关键词: 自组装, 纳米反应器, 受限空间, 聚苯乙烯微球, 形貌

The poly(ethylene glycol)-b-poly(propylene glycol)-b-poly(ethylene glycol) terminated with pentacyano(4-(dimethylamino)-pyridine) ferrate (EPE-Fe) complex surfactant was synthesized and was used to be self-assembled with styrene (St) in water to form a nano-reactor (EPE-Fe-St). The free radical polymerization of styrene occurred in the confined space in nanosize. And the polystyrene nanospheres (EPE-Fe-PS) were prepared in the nano-reactor. Furthermore, ferric ion was used to cure the shell of the EPE-Fe-St to form a hardened nano-reactor (Fe-EPE-Fe-St). The styrene polymerization was also arisen in the nano-reactor to form polystyrene nanospheres (Fe-EPE-Fe-PS) with a hardened shell. The results of molecular weight and morphology of polystyrene nanospheres show that the various size of monodispersed polystyrene nanospheres in 60～200 nm have been obtained in the confined nanospace. The effect of polymerization temperature on the size of self-assembled EPE-Fe-St is remarkable, and on the size of the Fe-EPE-Fe-St is slight. The higher molecular weight of the polystyrene has achieved more than 700000 in the confined space. In the self-assembled nano-reactor, the molecular weight of PS decreases with increase of initiator content in St solution and enhancement of polymerization temperature, and increases with augment of EPE-Fe content in water. The glass transition temperature (T_g) of the polystyrene nanospheres prepared in two kinds of the confined space are in the range of 90～135 ℃. The T_g of polystyrene nanosphere is enhanced obviously after hardening the shell of nano-reactor whether the hardening shell arises before or after the polymerization.

Key words: self-assembly, nano-reactor, confined space, polystyrene nanosphere, morphology

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王晓蜂, 袁荞龙. 受限空间内聚苯乙烯微粒的制备[J]. 化学学报, 2012, 70(9): 1047-1054.

Wang Xiaofeng, Yuan Qiaolong. Preparation of Polystyrene Nanospheres in Confined Space[J]. Acta Chimica Sinica, 2012, 70(9): 1047-1054.

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受限空间内聚苯乙烯微粒的制备

Preparation of Polystyrene Nanospheres in Confined Space

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