期刊
SOFT MATTER
卷 16, 期 1, 页码 219-228出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sm01619h
关键词
-
类别
资金
- Russian Foundation for Basic Research [18-03-00330]
- NSF [DMR-0520547]
- European Union's Horizon 2020 Research and Innovation Programme under the SINE2020 project [654000]
The morphologies and dynamics of poly(N-vinyl caprolactam) (PVCL) based hydrogels with titania nanoparticles in different states (native, air-dried to a constant weight and swollen in H2O or D2O) are studied by a combination of complementary techniques: wide angle X-ray scattering, small angle neutron scattering, neutron spin echo spectroscopy, differential scanning calorimetry. The results suggest the presence of different structural types of water leading to different properties of the hydrogels. We propose a hierarchical structure of hydrogels spanning from the molecular to the microscopic scale consistent with both the static structure (polymer mesh size, association of the nodes of crosslinks and microchains of PVCL) and the dynamics (rate of relaxation of polymer chains, hydrodynamic polymer-polymer correlation length). The presence of nanoscale titania does not change the molecular structure and nanostructure due to its aggregation into meso-domains, but does affect the microstructure, changing the response rate to a temperature jump from 20 to 50 degrees C. Titania nanoparticles do not change the equilibrium swelling degree of hydrogels.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据