Voronova Marina, Rubleva Natalia, Kochkina Nataliya, Afineevskii Andrei, Zakharov Anatoly, Surov Oleg
G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo 153045, Russia.
Department of Physical and Colloid Chemistry, Ivanovo State University of Chemistry and Technology, 7 Sheremetevsky Prospect, Ivanovo 153000, Russia.
Nanomaterials (Basel). 2018 Dec 5;8(12):1011. doi: 10.3390/nano8121011.
Composite films and aerogels of polyvinylpyrrolidone/cellulose nanocrystals (PVP/CNC) were prepared by solution casting and freeze-drying, respectively. Investigations into the PVP/CNC composite films and aerogels over a wide composition range were conducted. Thermal stability, morphology, and the resulting reinforcing effect on the PVP matrix were explored. FTIR, TGA, DSC, X-ray diffraction, SEM, and tensile testing were used to examine the properties of the composites. It was revealed PVP-assisted CNC self-assembly that produces uniform CNC aggregates with a high aspect ratio (length/width). A possible model of the PVP-assisted CNC self-assembly has been considered. Dispersibility of the composite aerogels in water and some organic solvents was studied. It was shown that dispersing the composite aerogels in water resulted in stable colloidal suspensions. CNC particles size in the redispersed aqueous suspensions was near similar to the CNC particles size in never-dried CNC aqueous suspensions.
分别通过溶液浇铸和冷冻干燥制备了聚乙烯吡咯烷酮/纤维素纳米晶体（PVP/CNC）复合薄膜和气凝胶。对宽组成范围内的PVP/CNC复合薄膜和气凝胶进行了研究。探讨了热稳定性、形态以及对PVP基体产生的增强效果。采用傅里叶变换红外光谱（FTIR）、热重分析（TGA）、差示扫描量热法（DSC）、X射线衍射、扫描电子显微镜（SEM）和拉伸试验来检测复合材料的性能。结果表明，PVP辅助的CNC自组装产生了具有高长径比（长度/宽度）的均匀CNC聚集体。已考虑了PVP辅助CNC自组装的一种可能模型。研究了复合气凝胶在水和一些有机溶剂中的分散性。结果表明，将复合气凝胶分散在水中可得到稳定的胶体悬浮液。重新分散的水性悬浮液中的CNC颗粒尺寸与未干燥的CNC水性悬浮液中的CNC颗粒尺寸几乎相似。
