研究了引发剂体系对氧化铝浆料固化过程的影响. 通过测试丙烯酰胺(AM)水溶液聚合过程的弹性模量曲线, 考察了引发剂体系对丙烯酰胺(AM)和N,N’-亚甲基双丙烯酰胺 (MBAM)水溶液交联聚合过程的影响. 引发剂体系分别为过硫酸铵(APS)、过硫酸铵-四甲基乙二胺(APS-TEMED)氧化还原体系和2,2’-偶氮[2-(2-咪唑啉-2-基)丙烷]盐酸盐(AZIP·2HCl). 三种引发剂中AZIP\cdot2HCl引发的聚合产物的模量在40～50℃都比较高; 温度对闲置时间影响较大, 更容易控制固化进程. AZIP·2HCl引发的50vol%浆料固化的模量曲线表明温度和引发剂浓度对浆料固化影响较大. 比较了三种引发剂引发的50vol%氧化铝浆料的固化过程模量曲线, 50℃时AZIP·HCl引发的浆料固化后的湿坯的弹性模量达到2.3×106Pa, 比APS(1.58×106Pa,55℃)和APS--TEMED(1.58×106Pa, 25℃)引发的浆料固化后的湿坯模量要高.
The effect of initiator systems on the gelation process of alumina slurry was studied. The gel former system based on the free-radical polymerization of acrylimade(AM) and N,N’-menthylene-bis-acrylamide(MBAM) was used in gelcasting of alumina. Three initiator systems, ammonium persulfate(APS), ammonium persulfate and N,N,N’,N’,-tetramethylethylenediamine redox system (APS-TEMED), and 2,2’-Azobis[2-(2-imidazolin-2-yl)propane] dihydrochlorid(AZIP·2HCl), were used to initiate the polymerization of AM and MBAM. The effect of initiator systems on the polymerization process was investigated by the elastic modulus change during polymerization. Among these initiator systems, idle time of polymerization initiated by AZIP·HCl shows remarkable dependence on temperature while the elastic modulus of polymer gelled is slightly increased with increasing temperature from 40℃ to 50℃. Elastic modulus in gelation process of 50vol% alumina slurry initiated by ZIP·2HCl shows that both temperature and initiator concentration have strong effect on the gelation process, by which the gelation process can be controlled. Compared with gelation initiated by other initiators, gelation of 50vol% alumina slurry initiated by AZIP·2HCl gains modulus of 2.3×10 6Pa at 50℃, which is higher than these by APS(1.58×106Pa) at 55℃ and APS-TEMED(1.58×106Pa) at 25℃.
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