Premium
Crystallization and Melting Behaviors of PPC‐BS/PVA Blends
Author(s) -
Zhang Zhihao,
Mo Zhishen,
Zhang Hongfang,
Wang Xianhong,
Zhao Xiaojiang
Publication year - 2003
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200350012
Subject(s) - crystallization , miscibility , materials science , vinyl alcohol , differential scanning calorimetry , polymer chemistry , chemical engineering , melting point depression , isothermal process , thermodynamics , melting point , composite material , polymer , physics , engineering
The isothermal crystallization and melting behaviors of poly(propylene carbonate) end‐capped with benzenesulfonyl/poly(vinyl alcohol) (PPC‐BS/PVA) blends over rich PVA composition range were first investigated by differential scanning calorimetry (DSC). PPC‐BS/PVA interaction parameter, χ 12 , calculated from equilibrium melting temperature depression was −0.44, revealing miscibility of PPC‐BS with PVA in the melt and favorable interactions. The temperature dependence of crystallization rate constant at initial crystallization stage was analyzed using the modified Lauritzen‐Hoffman expression. The chain width, a 0 , the thickness of a monomolecular layer, b 0 , the fold and lateral surface free energies, σ e and σ , and the work of chain folding, q , for neat PVA were first reckoned to be 4.50 Å, 4.78 Å, 76.0 erg · cm −2 , 8.81 erg · cm −2 , and 4.70 kcal · mol −1 , respectively. The values of σ e and q for PVA in PPC‐BS/PVA blends exhibited a maximum in the neighborhood of 10/90 PPC‐BS/PVA, respectively.Kinetic analysis of the temperature dependence of crystallization rate constant at initial crystallization stage for neat PVA and PPC‐BS/PVA blends.