Thermal degradation behaviors of polybenzoxazine and silicon-containing polyimide blends |
| |
Authors: | Sunan Tiptipakorn Shinji Ando Sarawut Rimdusit |
| |
Institution: | a Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Pathumwon, Bangkok 10330, Thailand b Department of Chemistry and Material Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552, Japan c Chemistry and Material Science Research Program, Office of Atoms for Peace, 16 Vibhavadi Rangsit Road, Chatuchak, Bangkok 10900, Thailand |
| |
Abstract: | Thermal behaviors of polymer blends between common-type polybenzoxazine (PBA-a) and polysiloxane-block-polyimide (SPI) were studied using Dynamic Mechanical Analysis (DMA) and Thermogravimetric Analysis (TGA). The polymer blends showed only one glass-transition temperature (Tg) that increased as the content of SPI increased. Synergistic behavior in the char formation of the alloys was clearly observed. The DTG curves showed three stages and two stages of decomposition reaction in neat PBA-a and SPI, respectively. For the blending systems with 25 wt%, 50 wt%, and 75 wt% of SPI, the DTG thermograms of the blends exhibited four stages of thermal decomposition reaction. The apparent activation energies (Ea) of each step were determined using Kissinger method, Flynn-Wall-Ozawa method and Coats-Redfern method. The type of solid state mechanism was determined by Criado method. From the calculation, the solid state thermal degradation mechanism is proposed to be F1 (random nucleation with one nucleus on the individual particle) type for PBA-a, SPI, and their blends. |
| |
Keywords: | Polybenzoxazine Silicon-containing polyimide Kinetics Degradation Char yield |
本文献已被 ScienceDirect 等数据库收录! |
|