【摘要】 研究了炔丙基醚化酚醛树脂(PN)与聚芳基乙炔树脂(PAA)的反应性共混物(以下简称PN-PAA共混树脂)的相容性,并对共混树脂的固化过程和固化物的耐热性进行了表征.相态、DSC、SEM、TEM等测试结果均表明共混树脂及其固化物是完全相容的均相体系.凝胶时间、粘度、DSC等结果表明共混树脂固化工艺性优良,适合多种成型工艺(如RTM),显著改善了PAA树脂的固化工艺缺陷.DMA、TGA等分析表明共混树脂固化物具有很高的耐热性,可作为新型的防热复合材料和高温结构材料的基体.更多还原

【Abstract】 The miscibility of reactive blends of PN (Propargyl novolac) resin and PAA (Polyarylcetylene) resin was studied.Evaluation on the storage stability,processability of the blends and thermal stability of the cured blends were also presented.As evidenced from phase observation,DSC analysis,SEM and TEM investigation,PN-PAA reactive blends were completely homogeneous.Compared with PAA,the blends exhibited improved storage stability at room temperature.The blends could be cured in a controllable way,thus the processability of the blends was marginally improved compared with that of PAA resin.DMA and TGA analyses indicated that the blends possessed high thermal stability (glass transition temperature as high as 380℃).Owing to the low viscosity of the blends and a proper gel time,as well as the elimination of volatiles during the curing process,the reactive blends are suitable for many processes including RTM (Resin transfer mold).The reactive blends of PN resin and PAA resin are amongst novel matrices of advanced materials for high temperature ablative and thermo-structural applications.更多还原