共聚物
材料科学
丙烯酸
粘弹性
肿胀 的
高分子化学
乳液聚合
动态光散射
化学工程
丙烯酰胺
聚合
分散聚合
聚合物
复合材料
纳米颗粒
纳米技术
工程类
作者
Coro Echeverría,Daniel López,Carmen Mijangos
出处
期刊:Macromolecules
[American Chemical Society]
日期:2009-10-27
卷期号:42 (22): 9118-9123
被引量:73
摘要
Positive thermosensitive microgels were obtained via the inverse emulsion polymerization method with controlled feeding system. Random acrylamide and acrylic acid copolymer microgels with different compositions were synthesized and characterized. Dynamic light scattering was used to determine the hydrodynamic diameter and swelling behavior. The morphology, distribution, and size were determined by scanning electron microscopy (SEM). Cross-linker and acrylic acid concentration of the copolymer affected collapse temperature of the swelling behavior. An oscillatory rheometer was used to study the viscoelastic properties. The viscoelastic modulus G′, and G′′, of the microgel nanoparticle dispersions suggested a solidlike behavior. A scaling theory was applied to describe the structure of microgel dispersion, and the fractal dimension of the aggregates was obtained.
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