What question did this study set out to answer?

To elucidate the molecular mechanism and sequential structural transformations governing solvent-induced crystallization of syndiotactic polystyrene glass.

December 14, 2000Macromolecules

Molecular Mechanism of Solvent-Induced Crystallization of Syndiotactic Polystyrene Glass. 1. Time-Resolved Measurements of Infrared/Raman Spectra and X-ray Diffraction

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Authors

KTKohji TashiroAichi Science & Technology Foundation YUYoko UenoUniversity of Niigata Prefecture AYAkiko YoshiokaKobe University

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Implication

Time-resolved structural analysis reveals sequential helical growth drives crystallization in glassy syndiotactic polystyrene, indicating that solvent type controls crystal lattice formation rates.

Key Points

To elucidate the molecular mechanism and sequential structural transformations governing solvent-induced crystallization of syndiotactic polystyrene glass.
Exposed glassy syndiotactic polystyrene samples to organic solvent vapors, specifically toluene, benzene, or chloroform.
Conducted simultaneous time-resolved Fourier-transform infrared spectroscopy, Raman spectroscopy, and X-ray diffraction to monitor chain conformation and lattice development.
Spectroscopic bands corresponding to regular (T2G2)2 helical conformations increased over time, displaying sequence-length-dependent time delays that chart the transition from random coil to regular helix.
X-ray scattering intensity increased markedly only after the emergence of long helical sequences, demonstrating that 3D crystal lattice formation requires the aggregation of extended helical segments.
Crystallization kinetics varied systematically across solvents, reflecting solvent-specific molecular interactions during chain reorganization.

Cite This Study

Tashiro et al. (2000) studied this question.

synapsesocial.com/papers/6a761bfff1e99ff85ab23904 https://doi.org/10.1021/ma001659s

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Implication

Time-resolved structural analysis reveals sequential helical growth drives crystallization in glassy syndiotactic polystyrene, indicating that solvent type controls crystal lattice formation rates.

Molecular Mechanism of Solvent-Induced Crystallization of Syndiotactic Polystyrene Glass. 1. Time-Resolved Measurements of Infrared/Raman Spectra and X-ray Diffraction

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Key Points

Cite This Study

Molecular Mechanism of Solvent-Induced Crystallization of Syndiotactic Polystyrene Glass. 1. Time-Resolved Measurements of Infrared/Raman Spectra and X-ray Diffraction

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