Structure-property relationships in segmented polyurethanes with metal chelates in the main chain

Citation
G. Georgoussis et al., Structure-property relationships in segmented polyurethanes with metal chelates in the main chain, EUR POLYM J, 36(6), 2000, pp. 1113-1126
Citations number
54
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
EUROPEAN POLYMER JOURNAL
ISSN journal
00143057 → ACNP
Volume
36
Issue
6
Year of publication
2000
Pages
1113 - 1126
Database
ISI
SICI code
0014-3057(200006)36:6<1113:SRISPW>2.0.ZU;2-4
Abstract
The relationships between structure and morphology on the one hand and mole cular mobility on the other hand in segmented polyurethanes (SPU) based on oligo-oxytetramethylene glycol with metal ions (Cu, Ni) incorporated in the chains (SPU metal chelates) were investigated by means of differential sca nning calorimetry (DSC), small-angle X-ray scattering, water sorption and d iffusion measurements, thermally stimulated depolarization currents (TSDC) techniques and broadband (10(-2) to 10(9) Hz) dielectric relaxation spectro scopy (DRS). These systems may be considered as models for the investigatio n of single ionic (anionic) conductivity. The various techniques employed p rovided several indications that the degree of microphase separation into h ard-segment microdomains and soft-segment microphase is higher in the syste m with Ni than with Cu ions. The relationships between DSC, TSDC and DRS, w ith respect to characteristic time scales, were investigated on the basis o f Arrhenius plot for the cc relaxation associated with the glass transition of soft-segment microphase. Conductivity effects were studied within the f ormalisms of complex permittivity and complex electric modulus. (C) 2000 El sevier Science Ltd. All rights reserved.