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Cocrystalline copolyimides of poly(ethylene 2,6-naphthalate)

Meehan, S. J., Sankey, S. W., Jones, S. M., MacDonald, W. A. and Colquhoun, H. M. (2014) Cocrystalline copolyimides of poly(ethylene 2,6-naphthalate). ACS Macro Letters, 2014 (3). pp. 968-971. ISSN 2161-1653

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To link to this item DOI: 10.1021/mz500357z

Abstract/Summary

Copolycondensation of N,N′-bis(2-hydroxyethyl)-biphenyl-3,4,3′,4′-tetracarboxylic diimide (5–25 mol %) with bis(2-hydroxyethyl)-2,6-naphthalate affords a series of cocrystalline, poly(ethylene 2,6-naphthalate) (PEN)-based poly(ester imide)s. The glass transition temperature rises with the level of comonomer, from 118 °C for PEN itself to 148 °C for the 25% diimide copolymer. X-ray powder and fiber diffraction studies show that, when 5 mol % or more of diimide is present, the α-PEN crystal structure is replaced by a new crystalline phase arising from isomorphic substitution of biphenyldiimide for PEN residues in the polymer crystal lattice. This new phase is provisionally identified as monoclinic, C2/m, with two chains per unit cell, a = 10.56, b = 6.74, c = 13.25 Å, and β = 143.0°.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Chemical Analysis Facility (CAF)
Interdisciplinary centres and themes > Nanoscience and Materials
Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:37562
Publisher:American Chemical Society

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