A study on the low temperature imidization with the catalyst p- hydroxyphenylacetic acid and the cocatalyst triethylamine

• Main Authors: wang, chun-chieh, 王俊傑
• Other Authors: Wha-Tzong Whang
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/84331031525475665443

碩士 === 國立交通大學 === 材料科學與工程研究所 === 85 === A study on the low temperature imidization with the catalyst p－hydroxyphenylacetic acid and the cocatalyst triethylamine Student：chun-chieh wang Advisor：Dr. Wha-Tzong Whang Institute of Materials Science and Engineering National Chiao-Tung University Abstract In this thesis,we use p-hydroxyphenylacetic acid as a catalyst and triethylamine as a cocatalyst to imidize pol- yamic acid(PAA) at low temperature.The rheology tests (at 25℃)show the viscosity of the PAA increase with the concentration of p-HPAA,and there is a similar case in TEA. But when the concentration of TEA is over 133.3 mole％，the PAA has the lower viscosity.At 80℃, the viscosity of the PAA decrease as the catalyst is over. The kinetic study with FTIR at the low temperature imi- dization shows：the catalysts lower the activation ener- gy of imidization in PAA. Final the PAA was spin-coated and fully imidize on silicon wafers and glass substrates.AFM、the instron、 the TGA、 the DMA were used to characterize the polyimide. The observation of AFM shows that the catalysts make the surface become rough in nanoscale.The higher the cata- lyst content,the rougher the surface. In the tensile-strain tests,the stress and the strain of the PI films change not significant.But as high catalyst con- tent is used in PI,the mechanical properities become wor- se. The datas of TGA show the same thermal stability in spite of the catalyst content. In the DMA tests,the glass-transition temperature of PI does not significantly change at the low catalyst content ,but the glass-transition temperature shifts to the lower temperature at the high catalyst content.