Synthesis and characterization of novel pH-responsive polyampholyte microgels

被引：68
作者：
Tan, BH
Ravi, P
Tam, KC
机构：
[1] Nanyang Technol Univ, Sch Aerosp & Mech Engn, Singapore 639798, Singapore
[2] Nanyang Technol Univ, Singapore MIT Alliance, Singapore 639798, Singapore
来源：
MACROMOLECULAR RAPID COMMUNICATIONS | 2006年 / 27卷 / 07期
关键词：
emulsion polymerization; PDEA; PMAA; polyampholyte microgel; stimuli-sensitive polymers;
D O I：
10.1002/marc.200500830
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
We synthesized for the first time novel pH-responsive polyampholyte microgels consisting, of poly(methacrylic acid) and poly(2-(diethylamino)ethyl methacrylate) (PMAA-PDEA) that are sterically stabilized with poly(ethylene glycol) methyl ether methacrylate (PEGMEM). These microgels showed enhanced hydrophilic behavior in aqueous medium at low and high pH but become hydrophobic and compact between pH 4 and 6 near the isoelectric point, Dynamic-light scattering measurements showed that the hydrodynamic radius, R-h of these microgels is approximately 100 nm between pH 4 and 6 and increases to around 140 and 170 run at pH 2 and 10, respectively. It is evident that the cross-linked MAA-DEA microgel that is sterically stabilized with PEGMEM retains the polyampholyte properties in solution.
引用
收藏
页码：522 / 528
页数：7
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