A novel thermosetting resin system for superabrasives based on novolak and bismaleimide （BMI） was developed. The novolak resin was allylated and then copolymerized with BMI. The structure of allyl novolak and reacti...A novel thermosetting resin system for superabrasives based on novolak and bismaleimide （BMI） was developed. The novolak resin was allylated and then copolymerized with BMI. The structure of allyl novolak and reaction mechanism were analyzed by FFIR. Thermal and mechanical properties were characterized by using com- prehensive thermal analyzer （DSC-TG） and strength tester, respectively. The results showed that high molecular weight of novolak was advantageous for heat-resistance, but was unfavorable for the bending strength. High allyl content improved the heat-resistance but lowered the bending strength. When the molecular weight of novolak was 450 and allyl content was 50%, the best resin system with good heat-resistance and bending strength was obtained. It was suitable for the manufacturing of superabrasive tools.展开更多
The rheological behavior of bismaleimide resin for resin transfer molding(RTM) was studied with DSC analysis and viscosity experiments A rheological model based on the dual Arrhenius equation was established and used ...The rheological behavior of bismaleimide resin for resin transfer molding(RTM) was studied with DSC analysis and viscosity experiments A rheological model based on the dual Arrhenius equation was established and used to simulate the rheological behavior of the resin The model predictions determined from the dual Arrhenius equation were in good agreement with experimental data The processing window of the resin system can be well determined based on the developed model The rheological model is importan...展开更多
A copolymer of bismaleimide-diallylbisphenol A-diphenylsilandiol was synthesized and the copolymerisation was studied by using N-phenylmaleimide, bisphenol A and diphenyl-silandiol as model compounds. The copolymer co...A copolymer of bismaleimide-diallylbisphenol A-diphenylsilandiol was synthesized and the copolymerisation was studied by using N-phenylmaleimide, bisphenol A and diphenyl-silandiol as model compounds. The copolymer could be well. cured around 200 degrees C, and the cured resins had good thermal stability. In the range of 170-210 degrees C, a higher curing temperature was favorable to obtain more thermal stable resin by reducing the content of diphenylsilandiol cyclo-homopolymer in resin which would spoil its-thermal stability.展开更多
The curing proces of chemical reactombetween flexible unsaturated polymer resin and diphenyl-methane bismaleimides which have been chain-prolonged by diaminodiphenylmethane is presented. also the kinetics parameter...The curing proces of chemical reactombetween flexible unsaturated polymer resin and diphenyl-methane bismaleimides which have been chain-prolonged by diaminodiphenylmethane is presented. also the kinetics parameters and curing technology are investigated.展开更多
介绍了含二氮杂萘酮联苯结构聚芳醚系列树脂和烯丙基双酚A(DABPA)、对二苯甲烷型双马来酰亚胺(BDM)树脂共混增韧改性研究进展。以耐高温可溶性含二氮杂萘酮联苯结构聚芳醚酮(PPEK)、聚芳醚砜(PPES)或聚芳醚腈酮(PPENK)为增韧改性剂,既...介绍了含二氮杂萘酮联苯结构聚芳醚系列树脂和烯丙基双酚A(DABPA)、对二苯甲烷型双马来酰亚胺(BDM)树脂共混增韧改性研究进展。以耐高温可溶性含二氮杂萘酮联苯结构聚芳醚酮(PPEK)、聚芳醚砜(PPES)或聚芳醚腈酮(PPENK)为增韧改性剂,既可以提高BMI共混物的韧性,又赋予其优异的耐热性能,相比而言,含砜基的PPES的增韧效果最好。分别对聚芳醚进行氨基和马来酰亚胺基封端改性,并将其用于BDM的共混改性,结果表明氨基和马来酰亚胺端基均参与BDM树脂的固化反应,增强了聚芳醚树脂与BDM树脂的界面粘结作用,进而提高了增韧效果。其中,加入马来酰亚胺封端PPES的增韧效果最好,缺口冲击强度比纯BDM树脂提高近1倍,达到4.26 k J/m2,样品断面形貌结构分析表明共混物发生了明显塑性变形,在断裂过程中吸收了大量的冲击能,从而使韧性提高。展开更多
文摘A novel thermosetting resin system for superabrasives based on novolak and bismaleimide （BMI） was developed. The novolak resin was allylated and then copolymerized with BMI. The structure of allyl novolak and reaction mechanism were analyzed by FFIR. Thermal and mechanical properties were characterized by using com- prehensive thermal analyzer （DSC-TG） and strength tester, respectively. The results showed that high molecular weight of novolak was advantageous for heat-resistance, but was unfavorable for the bending strength. High allyl content improved the heat-resistance but lowered the bending strength. When the molecular weight of novolak was 450 and allyl content was 50%, the best resin system with good heat-resistance and bending strength was obtained. It was suitable for the manufacturing of superabrasive tools.
基金National Natural Science F oundation of China(5 983 3 110 ) National Defence Foundation(0 0 j0 0 .5 .3 .hk0 14 4)
文摘The rheological behavior of bismaleimide resin for resin transfer molding(RTM) was studied with DSC analysis and viscosity experiments A rheological model based on the dual Arrhenius equation was established and used to simulate the rheological behavior of the resin The model predictions determined from the dual Arrhenius equation were in good agreement with experimental data The processing window of the resin system can be well determined based on the developed model The rheological model is importan...
文摘A copolymer of bismaleimide-diallylbisphenol A-diphenylsilandiol was synthesized and the copolymerisation was studied by using N-phenylmaleimide, bisphenol A and diphenyl-silandiol as model compounds. The copolymer could be well. cured around 200 degrees C, and the cured resins had good thermal stability. In the range of 170-210 degrees C, a higher curing temperature was favorable to obtain more thermal stable resin by reducing the content of diphenylsilandiol cyclo-homopolymer in resin which would spoil its-thermal stability.
文摘The curing proces of chemical reactombetween flexible unsaturated polymer resin and diphenyl-methane bismaleimides which have been chain-prolonged by diaminodiphenylmethane is presented. also the kinetics parameters and curing technology are investigated.
文摘介绍了含二氮杂萘酮联苯结构聚芳醚系列树脂和烯丙基双酚A(DABPA)、对二苯甲烷型双马来酰亚胺(BDM)树脂共混增韧改性研究进展。以耐高温可溶性含二氮杂萘酮联苯结构聚芳醚酮(PPEK)、聚芳醚砜(PPES)或聚芳醚腈酮(PPENK)为增韧改性剂,既可以提高BMI共混物的韧性,又赋予其优异的耐热性能,相比而言,含砜基的PPES的增韧效果最好。分别对聚芳醚进行氨基和马来酰亚胺基封端改性,并将其用于BDM的共混改性,结果表明氨基和马来酰亚胺端基均参与BDM树脂的固化反应,增强了聚芳醚树脂与BDM树脂的界面粘结作用,进而提高了增韧效果。其中,加入马来酰亚胺封端PPES的增韧效果最好,缺口冲击强度比纯BDM树脂提高近1倍,达到4.26 k J/m2,样品断面形貌结构分析表明共混物发生了明显塑性变形,在断裂过程中吸收了大量的冲击能,从而使韧性提高。
