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Melting behavior and crystallization kinetics of sulfonated poly(butylene isophthalate)
Author(s) -
Lotti Nadia,
Finelli Lara,
Munari Andrea,
Siracusa Valentina
Publication year - 2002
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11054
Subject(s) - crystallization , materials science , differential scanning calorimetry , kinetics , copolymer , amorphous solid , isothermal process , polyester , avrami equation , polymer chemistry , chemical engineering , polymer , crystallization of polymers , thermodynamics , crystallography , composite material , chemistry , physics , quantum mechanics , engineering
The melting behavior and the crystallization kinetics of sulfonated poly(butylene isophthalate) random copolymers were investigated by means of differential scanning calorimetry. The multiple endotherms, commonly observed in polyesters, were found to be influenced both by composition and crystallization temperature. By applying the Hoffman‐Weeks method, the equilibrium melting temperatures of the copolymers under investigation were obtained. The presence of a crystal‐amorphous interphase was evidenced and its amount was found to increase as the sulfonated unit content was increased. Isothermal melt crystallization kinetics of the sample containing the lowest amount of sulfonated units was analyzed according to the Avrami treatment. The introduction of such units was found to decrease the overall crystallization rate of poly(butylene isophthalate). Values of Avrami's exponent n close to 3 were obtained, independently of crystallization temperature, in agreement with a crystallization process originating from predetermined nuclei and characterized by three‐dimensional spherulitic growth.