以正丁基锂引发苯乙烯进行阴离子聚合,并用少量甲基丙烯酸缩水甘油酯进行终端共聚,制得端环氧基聚苯乙烯低聚物（PSG）,并将PSG用于环氧/酸酐树脂体系的增韧改性。采用GPC和FTIR对PSG的分子质量及分子结构进行了表征。采用简支梁冲击试...以正丁基锂引发苯乙烯进行阴离子聚合,并用少量甲基丙烯酸缩水甘油酯进行终端共聚,制得端环氧基聚苯乙烯低聚物（PSG）,并将PSG用于环氧/酸酐树脂体系的增韧改性。采用GPC和FTIR对PSG的分子质量及分子结构进行了表征。采用简支梁冲击试验机、万能试验机和热变形-维卡软化点温度测定仪及电镜分析研究了树脂浇铸体及复合材料的力学性能和耐热性。结果表明,当PSG的分子质量为3 500~4 900,添加质量分数为2%~7%时,冲击韧性由未改性环氧树脂的16.4 k J/m^2提升至31.1~39.8 k J/m^2,提高了89.6%~143%。同时,PSG改性环氧/酸酐树脂体系保持了良好的力学强度与耐热性。展开更多
In view of the importance of dispersion agent,the amount of the crosslinking monomer and the diluent in suspension polymerization for the production of particle size narrowly distributed low-density stryene divinylben...In view of the importance of dispersion agent,the amount of the crosslinking monomer and the diluent in suspension polymerization for the production of particle size narrowly distributed low-density stryene divinylbenzene copolymer microbeads(LDPS),their actions are preliminarily investigated in this paper.Experimental results indicate that when both the gelatine and polyvinyl alcohol(PVA)are used dispersion agents,the better effect is achieved,DVB is helpful to the formation of the lower density fine particles,the proportionof the DVB/St should be between 1:1-1.5:1.Compared with toluene,gasoline is the more effective diluent for the above target.展开更多
由自制改性剂苯乙烯和丙烯酸正丁酯低聚物及TDE-85环氧树脂协同改性氰酸酯树脂,采用示差扫描量热仪,动态热机械分析仪,力学性能和粘度测试研究了改性后的氰酸酯树脂的性能。结果表明,改性氰酸酯树脂浇铸体玻璃化转变温度高于215℃,TDE-8...由自制改性剂苯乙烯和丙烯酸正丁酯低聚物及TDE-85环氧树脂协同改性氰酸酯树脂,采用示差扫描量热仪,动态热机械分析仪,力学性能和粘度测试研究了改性后的氰酸酯树脂的性能。结果表明,改性氰酸酯树脂浇铸体玻璃化转变温度高于215℃,TDE-85环氧树脂质量分数为15%时,改性氰酸酯树脂浇铸体的综合性能最佳,拉伸强度为45 MPa,弯曲强度为86 MPa,冲击韧性为17 k J/m^2。改性树脂体系室温下6 h内粘度保持在1 000 m Pa·s以下,满足树脂传递模塑成型工艺的要求。展开更多
文摘以正丁基锂引发苯乙烯进行阴离子聚合,并用少量甲基丙烯酸缩水甘油酯进行终端共聚,制得端环氧基聚苯乙烯低聚物（PSG）,并将PSG用于环氧/酸酐树脂体系的增韧改性。采用GPC和FTIR对PSG的分子质量及分子结构进行了表征。采用简支梁冲击试验机、万能试验机和热变形-维卡软化点温度测定仪及电镜分析研究了树脂浇铸体及复合材料的力学性能和耐热性。结果表明,当PSG的分子质量为3 500~4 900,添加质量分数为2%~7%时,冲击韧性由未改性环氧树脂的16.4 k J/m^2提升至31.1~39.8 k J/m^2,提高了89.6%~143%。同时,PSG改性环氧/酸酐树脂体系保持了良好的力学强度与耐热性。
文摘In view of the importance of dispersion agent,the amount of the crosslinking monomer and the diluent in suspension polymerization for the production of particle size narrowly distributed low-density stryene divinylbenzene copolymer microbeads(LDPS),their actions are preliminarily investigated in this paper.Experimental results indicate that when both the gelatine and polyvinyl alcohol(PVA)are used dispersion agents,the better effect is achieved,DVB is helpful to the formation of the lower density fine particles,the proportionof the DVB/St should be between 1:1-1.5:1.Compared with toluene,gasoline is the more effective diluent for the above target.
文摘由自制改性剂苯乙烯和丙烯酸正丁酯低聚物及TDE-85环氧树脂协同改性氰酸酯树脂,采用示差扫描量热仪,动态热机械分析仪,力学性能和粘度测试研究了改性后的氰酸酯树脂的性能。结果表明,改性氰酸酯树脂浇铸体玻璃化转变温度高于215℃,TDE-85环氧树脂质量分数为15%时,改性氰酸酯树脂浇铸体的综合性能最佳,拉伸强度为45 MPa,弯曲强度为86 MPa,冲击韧性为17 k J/m^2。改性树脂体系室温下6 h内粘度保持在1 000 m Pa·s以下,满足树脂传递模塑成型工艺的要求。
