Tiainen Tony, Lobanova Marina, Karjalainen Erno, Tenhu Heikki, Hietala Sami
Department of Chemistry, University of Helsinki, PB 55, FIN-00014 Helsinki, Finland.
Polymers (Basel). 2020 Feb 26;12(3):507. doi: 10.3390/polym12030507.
Nanodiamonds (NDs) can considerably improve the mechanical and thermal properties of polymeric composites. However, the tendency of NDs to aggregate limits the potential of these non-toxic, mechanically- and chemically-robust nanofillers. In this work, tough, flexible, and stimuli-responsive polyelectrolyte films composed of cross-linked poly(butyl acrylate--dimethylaminoethyl methacrylate) (P(BA--DMAEMA)) were prepared by photopolymerization. The effects of the added carboxylate-functionalized NDs on their mechanical and stimuli-responsive properties were studied. When the negatively charged NDs were added to the polymerization media directly, the mechanical properties of the films changed only slightly, because of the uneven distribution of the aggregated NDs in the films. In order to disperse and distribute the NDs more evenly, a prepolymerized polycation block copolymer complexing agent was used during the photopolymerization process. This approach improved the mechanical properties of the films and enhanced their thermally-induced, reversible phase-transition behavior.
纳米金刚石（NDs）能够显著改善聚合物复合材料的机械性能和热性能。然而，NDs的聚集倾向限制了这些无毒、机械和化学性能稳定的纳米填料的应用潜力。在本研究中，通过光聚合制备了由交联聚（丙烯酸丁酯-甲基丙烯酸二甲氨基乙酯）（P(BA-DMAEMA)）组成的坚韧、柔韧且具有刺激响应性的聚电解质薄膜。研究了添加羧基官能化NDs对其机械性能和刺激响应性能的影响。当将带负电荷的NDs直接添加到聚合介质中时，由于聚集的NDs在薄膜中分布不均，薄膜的机械性能变化不大。为了更均匀地分散和分布NDs，在光聚合过程中使用了预聚合的聚阳离子嵌段共聚物络合剂。这种方法改善了薄膜的机械性能，并增强了其热诱导的可逆相变行为。
