可发气PS交联微球的制备及超微发泡材料结构与性能的研究

The monodispersed microspheres copolymerized with styrene (St) and bismethacryloyloxyphenylpropane (BVA) were prepared by emulsion polymerization and emulsifier-free emulsion polymerization. With the crosslinking copolymerized microspheres as seed, a series of foamable core-shell PS particles containing different foamable substances were synthesized. And they were of different crosslinking degree and particle diameters. The effect of the foamable substance on polymerizing dynamics and the microsphere structure in the seed swelling process was characterized by TEM．The structure and thermal decomposition dynamics of the foamable particles were also studied. The composite blowing agent was of the self-nucleated characteristic. The mechanism of the foams' nucleating, growing, stabilizing and controlling in the process of dynamic extrusion foaming was studied, and the limited free form extrusion process was invented. Used the new process, the perfect low-foam profile, sheet, and pipe which were of the uniform foam structure, lower density, high intensity, and glabrous surface were prepared. The produces have been extended to multi-area of the country and have gotten favorable economical and social benefit.

乳液聚合PS微粒过程中加入可发气组分偶氮二甲酰胺(AC)，得到一系列粒径、发气量、交联程度不同的纳米级PS微粒。以该微粒作为发泡剂加入聚合物基体中，可得到孔径大小、结构、分布可控且泡孔内含PS内核的超微发泡新颖结构材料。不仅开创了制备超微发泡材料的崭新路线，同时研究超微发泡过程中的物理化学问题及新结构材料结构与性能的关系。