- 學位論文
利用不同種類穩定劑製備聚醯胺酸顆粒
Preparation of Poly(amic acid) particles by different kinds of stabilizer
摘要
分散聚合反應及沉澱聚合反應製備聚醯胺酸顆粒。將二酸酐單體和穩定劑溶於聚合媒介中，再緩慢加入已溶於聚合媒介中二胺單體並以均質機在恆溫20℃及8000rpm下高速攪拌分散均勻或是以電磁攪拌器在恆溫20℃及600rpm下攪拌分散後，進行聚合反應，製得聚醯胺酸顆粒。利用改變單體固含量、穩定劑種類及反應條件，探討對聚醯胺酸顆粒粒徑大小、表面形態的影響還有熱性質研究，獲得製備單一散度聚醯胺酸顆粒的穩定聚合系統的條件。 得知，陰離子型十二烷基磺酸鈉和非離子型之立體障礙穩定劑聚乙烯基烷酮、聚丙烯酸，在適當的濃度下有較好的穩定效果；當二酸酐單體及二胺單體之總量增加會增加聚合顆粒徑且降低穩定效果。所獲得顆粒依反應條件及單體固含量、穩定劑種類不同，其粒徑介於0.2μm~0.4μm之間。
並列摘要
In this study, poly(amic acid) particles were prepared by dispersion polymerization and precipitation polymerization. Monomer dianhydride and different kinds of stabilizer were dissolved in polymerization medium and poured into reactor stirrering by homogenizer or magnetic stirrerat . Added Monomer diamine slowly into reactor stirrering in constant temperature for 20℃. Then disperse homogeneously and polymerization for 30 minutes. After completely polymerization, poly(amic acid) particles solution can be obtained。 By changing the different kinds of stabilizer and reaction conditions, the effects on the particles size、morphology and thermal properties were investigated. The stable polymerization system to prepare monodisperse poly(amic acid) particles can be found from this study。 From the experimental results, we can get better particle morphology with uniform by using SDS and PVP and PAA as stabilizer ; the diameter of poly(amic acid) particles increased with increasing the total amount of dianhydride monomer and diamine monomer. The particle diameter of poly(amic acid) particles prepared under various stabilizer and reaction conditions were in the range between 0.2μm to 0.4μm。