A novel type of Si-containing poly(urethane-imide)s: synthesis, characterization and electrical properties
- 作者：Delig脙脙z ; H脙脙seyin ; Yalc脛脛nyuva ; Tuncer ; 脙脙zg脙脙m脙脙s ; Saadet
- 关键词：Poly(urethane-imide) ; Poly(amic acid) ; Thermal imidization ; Dielectric properties
- 刊名：European Polymer Journal
- 出版年：2005
- 期刊代码：35_00143057
- 类别：ms
- 出版时间：April, 2005
- 卷：41
- 期：4
- 页码：771-781
- 文件大小：254 K
摘要
A novel type of a Si-containing poly(urethane-imide) (PUI) was prepared by two different methods. In the first method, Si-containing polyurethane (PU) prepolymer having isocyanate end groups was prepared by the reaction of diphenylsilanediol (DSiD) and toluene diisocyanate (TDI). Subsequently the PU prepolymer was reacted with pyromellitic dianhydride (PMDA) or benzophenonetetracarboxylic dianhydride (BTDA) in N-methyl pyrolidone (NMP) to form Si-containing modified polyimide directly. In the second method, PU prepolymer was reacted with diaminodiphenylether (DDE) or diaminodiphenylsulfone (DDS) in order to prepare an amine telechelic PU prepolymer. Finally, the PU prepolymer having diamine end groups was reacted with PMDA or BTDA to form a Si-containing modified polyimide. Cast films prepared by second method were thermally treated at 160脗脗C to give a series of clear, transparent PUI films. Thermogravimetric analysis indicated that the thermal degradation of PUI starts at 265脗脗C which is higher than degradation temperature of conventional PU, confirming that the introduction of imide groups improved the thermal stability of PU.