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Crystallization studies on linear aliphatic polyamides derived from naturally occurring carbohydrates
Author(s) -
Fernández C. E.,
Bermúdez M.,
Alla A.,
Mancera M.,
GarcíaMartín M. G.,
Benito E.,
Roffé I.,
Galbis J. A.,
MuñozGuerra S.
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.31759
Subject(s) - crystallization , nucleation , isothermal process , polyamide , polymer chemistry , materials science , optical microscope , chemical engineering , crystallography , thermodynamics , chemistry , composite material , organic chemistry , physics , engineering , scanning electron microscope
The thermal behavior of three series of sugar‐derived polyamides (PA‐ n Su) made from the arabinaric, mannaric and galactaric acids, respectively, and α,ω‐alkanediamines containing from 6 to 12 methylene units was investigated by DSC supported by polarizing optical microscopy. Crystallization from the melt under both isothermal and nonisothermal conditions was studied in detail. Melting temperatures of PA‐ n Su were found to decay steadily with the length of the polymethylene segment. Data registered from isothermally crystallized samples were analyzed by the kinetics Avrami approach, which revealed that crystallization initiated by combination of instantaneous and sporadically nucleation. Crystallization half‐times indicated that “crystallizability” of PA‐ n Su increases with the number of methylenes in the diamine unit and decreases with the length of the carbohydrate‐derived unit. Higher crystallinities were attained for polyamides made of shorter aldaric acids. The relation between thermal data and the configuration of the sugar moiety present in PA‐ n Su was discussed. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010