The optimum conditions for preparation of Al 13 sulfate were investigated.Some important parameters such as the ratio of n( OH - ) / n( Al ) ,reaction temperature,base injection rate,mixing intensity and ageing tim e ...The optimum conditions for preparation of Al 13 sulfate were investigated.Some important parameters such as the ratio of n( OH - ) / n( Al ) ,reaction temperature,base injection rate,mixing intensity and ageing tim e were identified.The hydroxyl ligand number and aging time are determinate fac tors for the forming of Al 13 .The nice tetrahedral sulfate was characterized by XRD and SEM,and the mol ecular formula was inferred to be[NaAlO 4 Al 12 (OH) 24 (H 2 O) 12 ](SO 4 ) 4 .This crystal was used as standard matter for preparation of polynuclear Al species(Al 13 ).The purity,stability and storage condition of the polynuclear Al 13 solution were explored.展开更多
文摘碳纤维混杂增强复合材料由于具有重量轻、可设计性强等诸多优点,广泛用于汽车、海洋、航空航天等行业.根据固化剂与环氧树脂的配比化学原理,计算出石墨烯-碳纤维混杂增强树脂基(GO-CF/EP)复合材料的最佳配比为1∶5,并采用真空浸渗热压成型工艺(VIHPS)制备1∶2~1∶7共六个配比的试样,结合形状记忆性能测试及微观形貌的观察,得到固化剂与环氧树脂实际最佳配比.实验结果表明,GO-CF/EP复合材料性能主要取决于体系中交联度的大小,交联度越大,复合材料的形状记忆性能越好,微观组织形貌也较理想.当基体配比为1∶5时,GO-CF/EP复合材料体系中交联度最大,微观形貌呈现均匀致密的状态,形状固定率最大,为95.90%;形状回复率最大,为95.40%;形状回复时间最短,为80.30 s;形状回复力最大,为9.48 N.当基体配比为1∶2或1∶7时,固化剂过量或不足,交联度较小,微观组织形貌中有大量的基体聚集区,其形状记忆性能下降,形状固定率及回复率也相应减小,分别为82.99%,81.66%,81.91%,78.75%;形状回复力分别只有5.20 N和5.50 N.
文摘The optimum conditions for preparation of Al 13 sulfate were investigated.Some important parameters such as the ratio of n( OH - ) / n( Al ) ,reaction temperature,base injection rate,mixing intensity and ageing tim e were identified.The hydroxyl ligand number and aging time are determinate fac tors for the forming of Al 13 .The nice tetrahedral sulfate was characterized by XRD and SEM,and the mol ecular formula was inferred to be[NaAlO 4 Al 12 (OH) 24 (H 2 O) 12 ](SO 4 ) 4 .This crystal was used as standard matter for preparation of polynuclear Al species(Al 13 ).The purity,stability and storage condition of the polynuclear Al 13 solution were explored.
