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1 Polish Journal of Applied Chemistry

1 2009

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Isothermal crystallization of sulfonated poly(ethylene terephthalate) ionomer crystal nucleation and growth parameters

Ostrowska-Gumkowska B., Ostrowska-Czubenko J.

Polish Journal of Applied Chemistry

2009

Vol. 53, nr 2

161-167

Isothermal crystallization of a ionic random copolyster (K-X/SPET) based on poly(ethylcne terephthalate) (PET) was analysed in detail over a compositional range from pure PET to a copolymer containing 10.1 mol % of potassium neutralized sulfonated PET. In measurements differential scanning calorimetry (DSC) was used. A significant influence of the ionic groups on crystal nuclcation and growth was stated. Under isothermal conditions, the nuclcation parameters (width of a critical nuclcus and free energy of forming a critical nucleus) are slightly dependent on the co-unit content. The crystal growth in the ionic copolycsters occurs from the melt by chain folding with trc values comparable to that of the corresponding nonionic homopolymer.