[On mechanical behavior of molecular composite resins reinforced with polyaramides. Molecular motion of Oct-PPTA and Ste-PPTA and thermal properties and dynamic viscoelasticity of Oct-PPTA-PMMA and Ste-PPTA-PMMA].
[On mechanical behavior of molecular composite resins reinforced with polyaramides. Molecular motion of Oct-PPTA and Ste-PPTA and thermal properties and dynamic viscoelasticity of Oct-PPTA-PMMA and Ste-PPTA-PMMA].
复制标题
[聚芳酰胺增强分子复合树脂的机械性能。
DOI：
--
复制
发表时间：
1990
期刊：
影响因子：
--
通讯作者：
S. Higuchi
中科院分区：
文献类型：
--
作者：
S. Higuchi
以聚甲基丙烯酸甲酯(PMMA)树脂为基质，以聚芳胺为刚性核分子，制备出具有良好口腔材料性能的义齿基托聚合物。N-取代聚芳胺在二甲基亚砜中与相应的辛基溴和/或硬脂基溴反应生成N-取代聚芳酰胺。在这些将3wt%的N-辛基-PPTA(OCT-PPTA)和/或N-硬脂化-PPTA(STE-PPTA)复合到PMMA中的分子复合树脂(简称OCT-PPTA-PMMA和STE-PPTA-PMMA)中，它们的牙科材料性能的顺序是OCT-PPTA-PMMA大于或等于PMMA。用核磁共振(核磁共振)、热重分析(TG)和动态机械热分析(DMTA)从分子水平分析了它们的聚合物性质。CdCl3中的T1(反转恢复法)核磁共振谱表明，OCT-PPTA的甲基运动受刚性主链的限制，而StE-PPTA的运动不受影响。TG分析表明，复合材料的热性能为OCT-PPTA-PMMA>STE-PPTA-PMMA>PMMA；DMTA测定的动态储能模量值在从橡胶状态到粘流状态的区域是OCT-PPTA-PMMA>STE-PPTA-PMMA>PMMA。
Molecular composites, composed of polymethylmethacrylate (PMMA) resin as matrix reinforced with polyaramides as a rigid core molecule have been developed to produce a denture base polymer with improved dental material properties. N-substituted polyaramides were prepared via metalation using sodium methylsulfinylcarbanion, followed by the reaction with corresponding octyl bromide and/or stearyl bromide in dimethyl sulfoxide. In these molecular composite resins (called Oct-PPTA-PMMA and Ste-PPTA-PMMA short) compounding 3 wt% of N-octylated-PPTA (Oct-PPTA) and/or N-stearylated-PPTA (Ste-PPTA) to PMMA, their dental material properties were in the order of Oct-PPTA-PMMA greater than Ste-PPTA-PMMA greater than or equal to PMMA. Their polymer properties were analyzed to molecular level, using nuclear magnetic resonance (NMR) spectroscopy, thermogravimetric (TG) analysis and dynamic mechanical thermal analysis (DMTA). The molecular motion of the methyl group of Oct-PPTA proved to be constrained for the rigid main chain by T1 (inversion recovery method) NMR spectra in CDCl3 while that of Ste-PPTA was not affected. The thermal properties of the composites were in the order of Oct-PPTA-PMMA greater than Ste-PPTA-PMMA greater than PMMA by TG analysis, and the dynamic storage modulus values were Oct-PPTA-PMMA greater than Ste-PPTA-PMMA greater than PMMA in the region from rubbery state to viscous flow state by DMTA.