Structure of Thermosensitive Poly(N-vinylcaprolactam-co-N-vinylpyrrolidone) Microgels
Structure of Thermosensitive Poly(N-vinylcaprolactam-co-N-vinylpyrrolidone) Microgels
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DOI：
10.1021/ma050548w
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发表时间：
2005-05
期刊：
影响因子：
5.5
通讯作者：
V. Boyko;S. Richter;I. Grillo;E. Geissler
中科院分区：
文献类型：
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作者：
V. Boyko;S. Richter;I. Grillo;E. Geissler
采用静态和动态光散射（SLS/DLS）和小角中子散射（SANS）研究了热可逆聚（n -乙烯基己内酰胺-co- n -乙烯基吡咯烷酮）微凝胶的内部结构。在30℃附近的相变过程中，旋转半径Rg和流体动力半径Rh急剧减小。在15°C和30°C时，实验SLS/SANS曲线可以拟合到具有粗糙表面的多分散球体模型。从相变过程中粒子内部结构变化的角度讨论了拟合参数。在50°C的完全坍塌状态下，散射响应可以用修正的Porod行为来描述。
The internal structure of thermoreversible poly(N-vinylcaprolactam-co-N-vinylpyrrolidone) microgels has been studied by static and dynamic light scattering (SLS/DLS) and small-angle neutron scattering (SANS). A dramatic decrease in the radius of gyration Rg and the hydrodynamic radius Rh is observed during the phase transition near 30 °C. At 15 and 30 °C the experimental SLS/SANS curves can be fitted to a model of polydisperse spheres with rough surfaces. The resulting fit parameters are discussed in the framework of changes in the internal structure of the particles during the phase transition. In the completely collapsed state at 50 °C, the scattering response can be described by a modified Porod behavior.