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Copolyesteramides—II. Anionic copolymers of ε-caprolactam with ε-caprolactone. Preparation and general properties

✍ Scribed by I. Goodman; R.N. Vachon

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
656 KB
Volume
20
Category
Article
ISSN
0014-3057

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✦ Synopsis

The N-sodiocaprolactam-catalysed anionic polymerisation of e-caprolactam is activated by e-caprolactone which itself acts as a comonomer, yielding copolyesteramides. At lower temperatures and lower catalyst concentrations, copolymerisation of the lactone is favoured over that of lactam; higher temperatures, higher catalyst concentrations and longer reaction times cause a more equal incorporation of the two comonomers giving products with molecular weights in the order of 104 and with NH(CH 2)5 CO and O(CH2)5CO unit contents approximating to those in the reactant feeds. The Tg's of the products lie between those of the homopolymer extremes but the T m vs composition relationship displays a shallow eutectic minimum at ca 20% NH(CH2)sCO group content and, for given NH(CH2)sCO group contents, is sensitive to changes in the technique of copolymerisation. Alternatingly-sequenced NH(CH2)sCO/O(CH2)sCO copolymers prepared by polycondensation also differ from anionic copolymers of similar sub-unit stoichiometry. The property differences imply differences of chain-sequential order and hence complexity in the mechanism of the anionic copolymerisation.

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