Dikshit, Asok Kumar (2010) Microstructural Development of Uniaxial Stretched Anneal-Oriented Syndiotactic Polystyrene and its Blend with Poly (2,6-dimethyl-1,4-phenylene oxide): DSC, WAXD, SAXS and FTIR Studies. INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS, 59 (8). pp. 628-645. ISSN 0091-4037

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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.

Item Type: Article
Uncontrolled Keywords: annealing; blends; orientation relaxation; poly(2; 6-dimethyl-1; 4-phenylene oxide); syndiotactic polystyrene
Subjects: Microstructure and Characterization
Depositing User: Bidhan Chaudhuri
Date Deposited: 09 Feb 2012 11:32
Last Modified: 28 Mar 2016 17:39
URI: http://cgcri.csircentral.net/id/eprint/727

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