| 초록 |
Amorphous poly(phenylene sulfide) (PPS) films were prepared by melt-pressing virgin PPS chips of high linearity and quenching into ice water. The films were annealed at 240ºC for up to 17 days and the changes in thermal property were investigated. Both the melting temperature and heat of melting of PPS measured by a DSC increased with increasing annealing time at 240ºC, whereas the melt crystallization temperature and heat of melt crystallization decreased. Although the melting peak on heating of the film annealed for 17 days still existed, the melt crystallization peak on cooling disappeared after more than 10 days annealing, indicating the introduction of high degree of cross-linking. Solubility tests of the annealed films also suggested the introduction of crosslinking. Increased crosslinking density refrained PPS from melt crystallization and dissolution in solvents. However, it was hard to detect the chemical structure change due to the crosslinking by FT-IR anaylsis. |
