论文部分内容阅读
为解决坯体干燥问题,将含大单体支链的温度响应凝胶体系应用于ZnO的凝胶注模成型,研究大单体支链PIPAAm的加入量与支链长度、总有机物含量和固相体积分数对悬浮液流变性能的影响,并分析坯体的干燥机理。研究表明:添加该凝胶体系的ZnO悬浮液仍表现为剪切变稀流变行为,但其黏度随着PIPAAm支链的加入量与相对分子质量以及总有机物含量的增加而升高。大单体支链的引入抑制甚至消除ZnO温度响应凝胶注模坯体表面“密实层”的形成,加快坯体干燥,促进坯体收缩。
In order to solve the problem of green body dryness, the temperature-responsive gel system containing macromonomer branches was applied to the gelcasting of ZnO. The effects of the addition amount of the macromonomer branched PIPAAm and the length of the branches, the total organic content Phase volume fraction on the rheological properties of the suspension, and analysis of the dry body mechanism. The results show that the ZnO suspension added with the gel system exhibits shear thinning rheological behavior, but its viscosity increases with the addition of PIPAAm branches, the relative molecular mass and the total organic content. The introduction of macromonomer branches inhibits or even eliminates the formation of ZnO temperature-responsive “gel layer” on the surface of the gelcast body, accelerating the drying of the green body and promoting the shrinkage of the green body.