CAJ | 학술논문

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。
위해결배체간조문제，장함대단체지련적온도향응응효체계응용우ZnO적응효주모성형，연구대단체지련PIPAAm적가입량여지련장도、총유궤물함량화고상체적분수대현부액류변성능적영향，병분석배체적간조궤리。연구표명：첨가해응효체계적 ZnO 현부액잉표현위전절변희류변행위，단기점도수착 PIPAAm 지련적가입량여상대분자질량이급총유궤물함량적증가이승고。대단체지련적인입억제심지소제ZnO온도향응응효주모배체표면“밀실층”적형성，가쾌배체간조，촉진배체수축。
To solve the problem of drying gelcast green body, the thermoresponsive gel system which contains macromonomer graft chains was used in gelcasting of ZnO. The effects of the amount and length of graft chains macromonomer PIPAAm, the total amount of organic matters, and the solid loading on the rheological properties of suspensions were investigated, and the drying mechanism of gelcast green body was analyzed. The results show that ZnO suspensions with the gel system still display shear- thinning rheological behavior, but its viscosity increases with increasing the addition amount and relative molecular mass of PIPAAm graft chain, and the total organic matter content. The PIPAAm graft chains inhibit or even eliminate the formation of the "dense layer” on the surface of gelcast ZnO green bodies, and accelerate the drying of green bodies. The introduction of PIPAAm graft chains facilitates the shrinkage of the gelcast ZnO green bodies, which is a feasible method to increase the relative density of green bodies.