Preparation of micrometer-sized, monodisperse "Janus" composite polymer particles having temperature-sensitive polymer brushes at half of the surface by seeded atom transfer radical polymerization

被引：35

作者：

Ahmad, Hasan ^{[1
,2
]}

Saito, Naohiko ^{[1
]}

Kagawa, Yasuyuki ^{[1
]}

Okubo, Masayoshi ^{[1
]}

机构：

[1] Kobe Univ, Grad Sch Engn, Kobe, Hyogo 6578501, Japan

[2] Rajshahi Univ, Dept Chem, Rajshahi 6205, Bangladesh

来源：

LANGMUIR | 2008年 / 24卷 / 03期

关键词：

D O I：

10.1021/la702994u

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Micrometer-sized, monodisperse polystyrene (PS)/poly[methyl methacrylate - (chloromethyl)styrene] [P(MMA-CMS)] composite particles having hemispherical structure were prepared by solvent evaporation from toluene droplets containing dissolved PS and P(MMA-CMS) dispersed in aqueous solution, which had been prepared using the membrane method. The formation of hemispherical ("Janus") morphology by phase separation between the PS and the P(MMA-CMS) was confirmed by both optical and electron microscopy. Atom transfer radical polymerization (ATRP) of 2-(dimethylamino)ethyl methacrylate (DM) was subsequently carried out in the presence of hemispherical PS/P(MMA-CMS) composite particles in an aqueous dispersed system. After polymerization, the morphology of the particles changed from spherical to "mushroom" shape as observed by scanning electron microscopy, indicating that DM polymerized inside or on the surface of half [P(MMA-CMS) phase] of the particles. H-1 NMR spectra were consistent with chloromethyl functional groups in P(MMA-CMS) operating as ATRP initiators in the DM polymerization.

引用

页码：688 / 691

页数：4

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