共搜索到303条信息,每页显示10条信息,共31页。用时:0小时0分0秒296毫秒
, Tsinghua University摘 要:(2,3-Dimethylbutyl)(2,4,40-trimethylpentyl)phosphinic acid(INET-3) was impregnated onto dry macroporous resins XAD-16 and pretreated XAD-16 with ethyl alcohol and HCl(Pre-XAD-16) to prepare the solvent impregnated resins SIRs-INET-3/XAD-16 and SIRs-INET-3/Pre-XAD-16. The molecular weight distribution of the low molecular weight(LMW......
, Tsinghua University摘 要:(2,3-Dimethylbutyl)(2,4,40-trimethylpentyl)phosphinic acid(INET-3) was impregnated onto dry macroporous resins XAD-16 and pretreated XAD-16 with ethyl alcohol and HCl(Pre-XAD-16) to prepare the solvent impregnated resins SIRs-INET-3/XAD-16 and SIRs-INET-3/Pre-XAD-16. The molecular weight distribution of the low molecular weight(LMW......
energy change of Re adsorption onto ZS15 weak-base resin is△G0 =-10.59 + 12.66 T.To verify the weak-base resins for extracting rhenium in industrial application,the column experiments were operated in the spray solution generating by roasting the molybdenum concentrates.The results indicate that the weak-base resins possess excellent adsorptive selectivity for rhenium.and the ammonia solution......
K.I.Satpayev摘 要:Sorption characteristics of ion exchange resins 001×7,005×8,D72 regarding rare earth metals(REM) during extraction from barren solution... of element of REM with the lowest affinity. Researches on REM desorption in dynamic conditions from investigated ion exchange resins by solution of 1.7 mol·L-1HNO3 and 8.0 mol·L-1NH4NO3 with 0.2 mol·L-1......
University, Shanghai 200240, China) Abstract: X-5 resin, which has higher adsorption capacity and easier desorption, was selected from five kinds of macroporous resins. Effects of the concentration, pH value... is 2 times of resins volume per hour. The optimal eluting solvent is 60%(volume fraction) ethanol-water solution with pH value of 10. The desorption rate overpasses 85% when the flow velocity is 1-2......
......
酚醛氰酸酯/环氧共固化树脂的结构和性能 陈淳1,梁国正2,李文峰3 (1.北京玻璃钢设计研究院,北京,102101;2.西北工业大学理学院,西安,710072;3.同济大学材料科学与工程学院,上海,200092) 摘要:研究了具有不同摩尔比的酚醛型氰酸酯(NCE)与双酚A型环氧(E-51)共固化树脂的化学结构与物理性能.结果表明,在共固化树脂的结构中,主要存在着三嗪,噁唑啉酮,异氰脲酸,醚键等化学结构.只有当氰酸酯的摩尔数大于环氧时,随着共固化体系中-OCN摩尔数的提高,化学结构中三嗪环含量增大,共固化树脂的力学性能,玻璃化转变温度(Tg),烧蚀残留率,吸水率随之提高;当-OCN/epo......
热处理对电子束辐射固化环氧树脂的作用效果 隋刚1,李凤梅2,陈昌麒1,张佐光1,孙志杰1 (1.北京航空航天大学;2.北京师范大学) 摘要:通过对热处理前后电子束辐射固化环氧树脂的动态力学分析,研究了不同样品的凝胶含量,tanδ以及动态模量的变化规律.结果表明,对电子束辐射固化的环氧树脂进行热处理,可以提高样品的固化程度和玻璃化温度(Tg),热处理后样品的模量随着温度的升高而下降的幅度减少.随着辐射固化度的增加,热处理的影响减弱.当热处理温度超过辐射引发剂的热引发温度时,在样品的tanδ曲线上出现反应局部热交联网络的松弛峰.在辐射固化度相近的情况下,树脂体系中的引发剂含量和分子量对热处理......
柔性胺改性剂对环氧树脂力学性能的影响 潘皖江1,杨果2,付绍云2,潘勤彦2 (1.中国科学院,等离子体研究所,合肥,230031;2.中国科学院,理化技术研究所,北京,100080;3.中国科学院研究生院,北京,100039) 摘要:以柔性胺D-230作为改性剂,用浇铸成型法制备了环氧树脂结构胶,研究了其力学性能与D-230加入量的关系,并探讨了该材料的微观断裂形貌与韧性的关系.力学测试结果显示室温断裂延伸率,室温和低温冲击韧性随D-230含量的增加而增加,表明D-230对环氧树脂产生有效的增韧作用.当D-230加入量为21%(质量分数)时,室温拉伸强度和弹性模量最大,分别为85.44M......
耐371℃ PMR型含异构联苯结构的聚酰亚胺树脂及复合材料 杨士勇1,曲希明1,范琳1,冀棉1,赵伟栋2 (1.中国科学院化学研究所高技术材料实验室,北京,100190;2.航天材料及工艺研究所,北京,100076) 摘要:采用活性单体原位聚合方法,由2,3,3'',4''-联苯四甲酸二乙酯为芳香族二酸二酯,对苯二胺与间苯二胺混合物为芳香族二胺,降冰片稀二甲酸单乙酯为反应性封端剂制备了系列PMR型聚酰亚胺树脂.研究了树脂的化学结构及其计算分子量等对其成型工艺性能和耐热性能的影响规律.以优选树脂体系为基体与碳纤维复合制备的碳纤维增强聚酰亚胺树脂基复合材料表现出优良的耐热性能与力学性能,室温......