Study on the Crystalline Structure Transition of Syndiotactic Polystyrene Film During Heat Treatment by Two-Dimensional Infrared Correlation Spectroscopy

Authors: Li, Weizhen; Wu, Peiyi

Source: Applied Spectroscopy, Volume 63, Issue 8, Pages 184A-214A and 859-978, (August 2009) , pp. 926-931(6)

Publisher: Society for Applied Spectroscopy

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Abstract:

The crystal structure transition of syndiotactic polystyrene film from the helical conformation to the more stable planar zigzag conformation during a heating process was studied using Fourier transform infrared (FT-IR) spectroscopy in combination with two-dimensional (2D) correlation analysis and perturbation-correlation moving-window 2D analysis. The sequence of different conformations during the transition was investigated by analyzing two-dimensional FT-IR correlation spectra in the spectral ranges of 800–700 cm−1 and 600–500 cm−1. It was observed that the conformation of δ helical changes prior to γ helical, and the γ helical phase is faster than the α′ planar zigzag phase. By utilizing the 2D asynchronous correlation spectra, the 744 cm−1 band, which is usually incorporated in the broad 750 cm−1 band, can now be uniquely attributed as the α′ zigzag configuration for the first time. Furthermore, by employing thermal perturbation, the shorter helical segments consisting of m = 7–12 and m = 12–20 monomeric units were disturbed in a shorter time than the longer helical segments m = 20–30 during the heating process.

Keywords: 2D-COS; PHASE TRANSFORMATION; SYNDIOTACTIC POLYSTYRENE; TWO-DIMENSIONAL CORRELATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209788964494

Affiliations: The Key Laboratory of Molecular Engineering of Polymers (Ministry of Education) and Department of Macromolecular Science and the Laboratory of Advanced Materials, Fudan University, Shanghai 200433, P.R. China

Publication date: August 1, 2009

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