PAMS微球制备过程中电解质的影响

为调控固化过程中双重乳液内径的变化和降低聚-α-甲基苯乙烯(PAMS)微球的表面粗糙度,研究了双重乳液固化过程中内外水相中电解质浓度对水在油相液膜中迁移和分相行为的影响。结果表明:仅在外水相中添加电解质时,内水相的渗透压高于外水相,使得内相水向外水相迁移,导致固化后的微球表面起皱。当在内外水相同时添加电解质时,由于平衡了三相之间水的化学势,抑制了水在油相液膜中的迁移和分相,导致PAMS微球壳壁内气泡体积和数量显著降低。同时,在内外水相中同时添加不同浓度的电解质,还可显著改善双重乳液三相之间的密度匹配度,从而提高微球的球形度和壁厚均匀性。     

筛网盘对聚α-甲基苯乙烯微球弹跳性能的影响

 介绍了利用筛网设计制作出的一种新型的反弹盘,并用于聚α-甲基苯乙烯（PAMS）微球的弹跳实验。分析了筛网盘与玻璃盘之间的差别和由此带来的对PAMS微球弹跳性能影响。通过实验分别研究了筛网盘相关的参数对微球表面粗糙度的影响。结果表明：采用筛网盘与玻璃盘相比,PAMS微球的弹跳性能的改善非常明显;筛网盘的使用较好地解决了在无等离子体的镀膜环境下（如热蒸发的方法制备PAMS微球表面聚酰亚胺涂层）PAMS微球的弹跳问题;为降低微球表面粗糙度,反弹盘应采用间歇振动的模式。     

PAMS基凝胶型聚合物锂电池的制备及电化学性能表征

An admixture of acrylonitrile, methyl methacrylate, styrene and commercial liquid electrolyte (LB302, 1 mol/L solution of LiPF6 in 1∶1 EC/DEC) was enclosed in CR2032 cells. The assembled cells were then γ-ray irradiated using configurations of LiNi0.8Co0.2O2/Li half cells. Through this in-situ irradiation polymerization process, rechargeable lithium cells with poly(acrylonitrile-co-methyl methacrylate-co-styrene) (PAMS) were obtained based gel polymer electrolytes. The structure and thermal stability of PAMS were characterized by FT IR and DSC analyses. The electrochemical properties and charge discharge performance of PAMS-based gel-polymer lithium cells were evaluated by AC impedance spectroscopy, cyclic voltammetry and gavanostatic battery cycling. The results indicate that the in-situ gama-ray irradiation approach is convenient to prepare gel-polymer lithium cells with good charge-discharge performance.