- 學位論文
探討溶劑對聚醯胺酸顆粒之影響
The effect of the solvent on Poly(amic acid) particles
摘要
本實驗是利用沉澱聚縮合反應，將二胺單體與溶劑（良溶劑與不良溶劑）直接加入溶媒（Acetone）中，在均質機高速攪拌下，待溶液呈現均勻相後，加入二酸酐單體進行反應，再經由真空乾燥後，製備出具孔隙性聚醯胺酸顆粒，並討論不同的溶劑與劑量會對聚合顆粒的外部型態與內部結構有何影響。 由實驗結果得知，添加溶劑可以得到具孔隙性聚合顆粒，並且會使聚合顆粒粒徑脹大一些。添加良溶劑得到的顆粒微孔面積比較大，其中以添加THF所產生的微孔表面積最大；添加不良溶劑造成的外表面積比較大，其中又以添加甲苯造成的外表面積最大。當溶劑隨著劑量增多，良溶劑造成的微孔面積增多，但也讓顆粒變得比較柔軟，容易造成孔洞回填而讓部分孔洞消失；但不良溶劑液滴不會均勻地分散在聚合顆粒中，而是被包覆在顆粒之中形成明顯的孔洞。
並列摘要
In this study, porous poly(amic acid) particles prepared by using precipitation polycondensation. Diamine monomer and solvent (good solvent or poor solvent) dissolved in polymerization medium(Acetone). When the medium became homogenous phase, adding dianhydride monomer into medium to polymerize by using homogenizer at a high speed. Subsequently, porous poly(amic acid) particles can be obtained after vacuum drying. By changing different kinds of solvent and the recipes, the effects on the size and morphology were investigated. From the experimental results, by adding solvent, porous poly(amic acid) particles can be prepared and the diameter of particles increased. Adding good solvent could get more micropore area. And the largest micropore area was made by THF. Adding poor solvent could get more external surface area. And the largest external surface area was made by Toluene. As the amount of good solvent increased, the micropore area increased , the particles became soft to backfill partly pores easily. Poor solvent would not disperse uniformly in particles, as the amount of poor solvent increased, but formed obviously pores in particles.