Advances in Polymer Science 89 - download pdf or read online

Nonfiction 7

By Andreis Kulicke

ISBN-10: 0387504737

ISBN-13: 9780387504735

ISBN-10: 3540504737

ISBN-13: 9783540504733

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286 Reprinted from Ref. 97) the two phases and the fraction of protons associated with the hard phase (f) at 28 °C, are given in Table 3. From the molecular mobilities of the soft and hard phases, it appears that the increase in phase mixing caused by crosslinking, is more important in determining phase mobility than a simple increase in crosslink density. The fraction of protons in the hard phase (f) is relatively independent of crosslink density at 28 °C. However, f in linear and crosslinked PEU have diffèrent temperature behaviors (Fig.

Generally, T2 relaxation times are very sensitive to slower relative translational motions of the polymer chains and can provide information on intramolecular couplings, such as chemical crosslinks and chain entanglements. Numerous studies on both permanent and temporary networks are presented in a series of papers by Charlesby and co-workers 74,86_94) . In the case of extracted polymer networks, T2S relaxation is observed in the crosslinked (gel) fraction, while T2 relaxation occurs in the soluble fraction of the irradiated polymer 86).

The calculated T2 values are of the same order as experimental, but are substantially smaller as the degree of crosslinking becomes very small. This is probably due to the increased content of loose ends in the network. The dependence of T2 values in the plateau region on the crosslink density, indicate the effect of restricted network dynamics on the low-frequency, long-range configurational motions. A plot of normalized T2 for crosslinked polybutadienes (PB), (ratio of T2 for crosslinked PB over T2 for uncrosslinked PB), is shown in Fig.

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Advances in Polymer Science 89 by Andreis Kulicke


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