期刊
INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS
卷 59, 期 8, 页码 628-645出版社
TAYLOR & FRANCIS AS
DOI: 10.1080/00914031003760741
关键词
annealing; blends; orientation relaxation; poly(2; 6-dimethyl-1; 4-phenylene oxide); syndiotactic polystyrene
资金
- Japan Society for the Promotion of Science (JSPS) [PB 01704]
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Science City, Japan.
Studies have been done on strain-induced microstructure development in syndiotactic polystyrene (s-PS) and its blends with poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) in 70/30 and 50/50 compositions of stretched annealed samples. Wide-angle X-ray showed that crystal orientation is less in annealed blend samples compared to annealed pure s-PS for a higher draw ratio. It increases with annealing, and relaxation occurs after a certain annealing temperature at above 180 degrees for both s-PS and s-PS/PPO 70/30 blends. No crystal orientation was observed in the blend of s-PS/PPO 50/50 stretched samples. Small angle X-ray scattering (SAXS) shows the inclusion of amorphous PPO chains in between s-PS crystals lamella. Fourier transform infrared (FTIR) spectroscopy shows that the s-PS molecular chain packing band at 905cm-1 is enhanced due to annealing in oriented samples and saturates to around 0.63. The crystal chain relaxation is lower than amorphous chains of s-PS. The molecular chains of amorphous PPO are less oriented into the blend matrix, whereas its relaxation is enhanced during heat treatment and reaches an optimum value after full relaxation. The different behaviors of orientation and relaxation of s-PS and PPO chains into the blend matrix produce superstructures.
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