酸性含氟聚(矽氧烷-亞醯胺)共聚物及混成材料之特性研究

• Main Authors: Wang, G.P., 王國平
• Other Authors: 洪耀勳
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/94073454688819932319

博士 === 國防大學中正理工學院 === 國防科學研究所 === 90 === The purposes of this thesis were to synthesize and characterize acidic hydrogen-bonded fluorinated poly(amide-imide) copolymers and their hybrids via the sol-gel technique. IR spectra were employed to evaluate the degree of imidization and TMOS polycondensation. 29Si- and 13C-NMR CP/MAS spectroscopy were also used to confirm the chemical structures of reaction products. Moreover, the dynamics on local mobility of the copolymers and hybrids were investigated by the spin-spin relaxation time (T2), the time constant for energy exchange between 1H and 29Si spin system (TSiH) and spin-diffusion path length (L) measurements. The glass transition temperatures and thermal stability of copolymers and hybrids were also investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). We found that the apparent activation energy (Ea) of copolymers with siloxane segment (PSAI) in air was higher than that of the unmodified polyamideimide (PAI). The result suggested that the disiloxane enhanced the stability of the polyamideimide. Furthermore, the smaller spin-spin relaxation time (T2) of the PSAI copolymers than that of the PAI revealed that the PSAI had more packed configuration structure with increasing 1,3-Bis(3-amino-propyl) tetramethyldisiloxane (APrTMDS) because of the flexible mobility of APrTMDS segment. The interactions of the charge transfer between donor and acceptor molecules or - aromatic stacking might be the dominant factors to affect and made the aggregated structures of the hybrids.