Morphological changes in thermoplastic polyurethanes during heating

被引：0
|
作者：
Laity, P.R. [1 ]
Taylor, J.E. [1 ]
Wong, S.S. [2 ]
Khunkamchoo, P. [2 ]
Cable, M. [3 ]
Andrews, G.T. [3 ]
Johnson, A.F. [2 ]
Cameron, R.E. [1 ]
机构：
[1] Materials Science and Metallurgy, University of Cambridge, New Museums Site, Cambridge CB2 3QZ, United Kingdom
[2] IRC in Polymer Science and Technology, School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom
[3] Ranier Technology Ltd., Greenhouse Park Innovation Centre, Newmarket Rd., Cambridge, CB1 5AS, United Kingdom
来源：
Journal of Applied Polymer Science | 2006年 / 100卷 / 01期
关键词：
This work investigated the thermal behavior of a series of thermoplastic poly(ether-urethane)s containing 36-71% by weight hard segments derived from 4,4′-methylene-bisphenylisocyanate and butane-l,4-diol, with poly(tetramethylene oxide) soft segments. In all materials studied, differential scanning calorimetry revealed the presence of a T1 endotherm ∼20-30°C above the annealing temperature. Morphological changes during heating were observed using small-angle X-ray scattering; the data was analyzed using globular models based on a one-dimensional statistical lattice or the Percus-Yevick description of liquids; both of which appeared to provide good descriptions of these materials. The results indicated that the T 1 endotherm coincided with the onset of morphological changes during heating. Possible explanations are discussed; based on the melting of small hard-segment crystals or an activation energy associated with transient segmental mixing. © 2006 Wiley Periodicals; Inc;
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页码：779 / 790
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