Dynamic Viscoelasticity of High Modulus Fiber Reinforced Composite Resins and Molecular Motion and Dynamic Viscoelasticity of Molecular Composite Resins

采用PMMA树脂包覆处理过的碳纤维（CF）和凯夫拉纤维（KF）布的宏观复合试样，以及以PMMA树脂为基体，聚酰胺为刚性核分子增强的微观分子复合材料，制备了具有改善口腔材料性能的义齿基托聚合物。经环氧处理的CF布（称为ECF短，0.1mm厚度1片）增强树脂的抗弯强度比ACRON提高了25%，抗拉强度提高了50%。经氯磺化乳胶间苯二甲酸处理后的KF布（简称clrkf， 0.1mm厚1片）增强树脂的抗折强度比ACRON提高了25%，抗拉强度提高了80%，抗冲击强度提高了70%。采用动态机械热分析仪（DMTA）研究了纤维增强复合材料中表面处理后的纤维布与基体树脂之间的相互作用。这些试样的动态储存模量（E′）值和α峰的tan δ值在玻璃态到黏性流动状态（50 ~ 250 ^）区域内更为稳定。C)由DMTA决定。未处理的CF布（1片）复合试样的E′值在150℃时比ACRON提高了50%。在150℃下，未处理的KF布（1片）复合试样的E′值比ACRON提高了40%。这些结果表明，在布夹复合材料样品中，极性基团对表面布与基体之间的分子相互作用有显著影响。化学处理的CF布复合试样的E′值低于未处理的CF布复合试样的E′值。化学处理过的CF布的纤维表面。被认为是在化学反应中损坏的。ECFA的E′值比ACRON在200^时增加了120%。C，在复合试样中tan δ值最低（1.31）。ECF布复合试件的抗弯、抗拉、抗冲击强度及E′值随ECF桩片数（0.1mm厚）的增加而增加，α峰温度随ECF桩片数的增加而降低。这可能是由于低分子量环氧处理剂和非聚合环氧处理剂的数量随ECF数量的增加而增加。聚对苯对苯二甲酰胺（PPTA）衍生物的刚性复合材料。对聚间苯二苯酰胺（MPIA）和聚对苯-3.4′-氧二苯基对苯二甲酸（PPOT）分子本身也进行了检测。n -辛基化聚酰胺可溶于甲基丙烯酸甲酯单体。研究了将3wt% n -辛基- ppta （Oct-PPTA）、n -辛基- mpia （Oct-MPIA）和n -辛基- ppot （Oct-PPOT）与PMMA复配的分子复合树脂（称为Oct-PPTA-PMMA、oct - mpma -PMMA和简称Oct-PPOT-PMMA）的力学性能。顺序为：Oct-PPTA-PMMA> Oct-PPTA-PMMA> Oct-MPIA-PMMA *PMMA。采用核磁共振（NMR）、热重（TG）和DMTA对分子复合材料进行了表征。CDCI_3中n -辛烷化聚酰胺的T_1（反转恢复法）核磁共振谱的羰基和甲基的分子运动顺序为Oct-PPTA <Oct-PPOT<Oct-MPIA。主链直性较好的核心分子的羰基和甲基T_1值较小。复合材料的失重起始温度为Oct-PPTA-PMMA(266 ^。C) > 10 - ppot - pmma(263 ^。C) >Oct-PPTA-MPIA(246 ^。C) > pmma(237 ^。C)通过TG分析。在200℃下，Oct-PPTA-PMMA和Oct-PPOT-PMMA的E′值比PMMA提高了35%，oct - mpa -PMMA的E′值比PMMA提高了15%。Oct-PPTA-PMMA、Oct-MPIA-PMMA、Oct-PPTA-PMMA和PMMA的T_1值、失重温度、E′值与牙体材料性能之间存在良好的相关性。综上所述，由直主链聚酰胺分子组成的PMMA树脂具有较好的牙科材料性能。少

Macro level composite specimens of treated carbon fiber (CF) and Kevlar fiber (KF) cloths sandwiched by PMMA resin, and micro level molecular composites composed of PMMA resin as matrix reinforced with polyaramides as rigid core molecules have been developed to produce denture base polymers with improved dental material properties.The epoxy treated CF cloth (called ECF short, 0.1mm thickness 1 sheet) reinforced resin was improved in bending strength by 25% and tensile strength by 50% from ACRON. The chlorosulfonated latex resorcine treated KF cloth (calledCLRKF short, 0.1mm thickness 1 sheet) reinforced resin was improved in bending strength by 25%, in tensile strength by 80% and izod impact strength by 70% from ACRON.The interaction between surface treated fiber cloths and the matrix resin in the fiber reinforced composites was investigated using a Dynamic Mechanical Thermal Analyzer (DMTA).The dynamic storage modulus (E') value and tan delta of alpha peak of these specimens were meas … More ured in the region from glass state to viscous flow state (50-250 ^。C) by DMTA. E' value of the composite specimen of the non-treated CF Cloth (1 sheet) was increased by 50% from ACRON at 150 ^。C. E' value of the composite specimen of the non-treated KF cloth (1 sheet) was increased by 40% from ACRON at 150 ^。C. These findings indicate a significant effect of the polar groups on the molecular interaction between the surface cloths and matrix in the cloth sandwiched composite specimens. The E' value of composite specimen of chemically treated CF cloth was lower than the E' value of composite specimen of non-treated CF Cloth. The fiber surface of the chemically treated CF cloth. Was assumed to be damaged by the chemical reaction. ECFA was increased in E' value by 120% from ACRON at 200^。C and showed the lowest (1.31) value in tan delta in the composite specimens.The bending, tensile and izod impact strength and E' value of the composite specimens of the ECF cloth increased with the number of ECF pile sheets (0.1mm thickness), while the temperature of the alpha peak of composite specimens decreased with the number of the ECF pile sheets. This may be due to the increase of the amount of low molecular weight and non-polymerized epoxy treated agent with the number of ECF.Rigid core composites made of derivatives of poly-p-phenylene terephthalamide (PPTA). Poly-m-phenylene isophthalamide (MPIA) and poly-p-phenylene-3.4'-oxydiphenylene terephthalamide (PPOT) molecules themselves were also examined.N-octylated polyaramides were soluble in methylmethacrylate nonomer. Themechanical properties of the nolecular composite resins (called Oct-PPTA-PMMA, Oct-MPIA-PMMA and Oct-PPOT-PMMA short) compounding 3wt% of N-octylated-PPTA (Oct-PPTA), N-octylated-MPIA (Oct-MPIA) and N-octylated-PPOT (Oct-PPOT) to PMMA. Were in the order of Oct-PPTA-PMMA>Oct-PPOT-PMMA >Oct-MPIA-PMMA *PMMA.The characters of the molecular composites were examined, using nuclearmagnetic resonance (NMR) spectroscopy, thermogravimetric (TG) analysis and DMTA.The molecular motion of carbonyl and methyl group of N-octylated polyaramides were in the order of Oct-PPTA <Oct-PPOT<Oct-MPIA by T_1 (inversion recovery method) NMR spectra in CDCI_3. T_1 values of carbonyl and methyl group of the core molecules which have superior straight property of main chain are rather small. Initial temperature of weight loss of the composite were in the order of Oct-PPTA-PMMA (266 ^。C) >Oct-PPOT-PMMA (263 ^。C) >Oct-PPTA-MPIA (246 ^。C) >PMMA (237 ^。C) by TG analysis.E' values of Oct-PPTA-PMMA and Oct-PPOT-PMMA were improved by 35% and E'value of Oct-MPIA-PMMA was improved by 15% from PMMA at 200 ^。C.There was a good correlation among the T_1 values, stating temperature of weight loss, E' values and dental material properties of Oct-PPTA-PMMA, Oct-MPIA-PMMA, Oct-PPOT-PMMA and PMMA.In conclusion, PMMA resins composed of the polyaramide molecule of straight main chain have suit able dental material properties. Less