ISSN:
0887-6266
Keywords:
blends, polyamide-polyester, amide-ester interaction in
;
Miscibility in blends of aliphatic polyesters, polyamides, and their copolymers
;
copolyester-amides, composition/miscibility correlations in blends with aliphatic polyamides and copolyamides
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Random copolyester-amides derived from the cyclic monomers caprolactam, caprolactone, and laurolactam have been synthesized and characterized. Binary blend combinations based upon the latter and regular aliphatic polyamides and copolyamides have been investigated experimentally and the compositio/miscibility correlations determined. By treating the polymers involved as random copolymers on a microstructural scale, composed of methylene, amide, and ester groups, it has been possible to accommodate the experimental observations within the framework of a binary interaction model. A principal feature is that homogeneous mixtures can be obtained only when the chemical constitutions of the blend components do not differ from one another too greatly. Establishing the model on a scale dictated by an independent estimation of the methylene-ester interaction, obtained by Paul, Barlow, and co-workers, was found to give moderate agreement. However, a more precise description of the data could be obtained if the model was scaled from internal observations. Calculations indicate that all the segmental interactions are unfavorable for mixing. Although this some-times can produce miscibility, it has been proposed that miscibility in blends composed of aliphatic polyesters, polyamides and their copolymers is driven entirely by the entropic contribution to the free energy of mixing. © 1993 Johnxs Wiley & Sons, Inc.
Additional Material:
16 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/polb.1993.090310907
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