By Avraam I. Isayev
A whole and well timed evaluation of the subject, this Encyclopedia imparts wisdom of basic rules and their purposes for academicians, scientists and researchers, whereas informing engineers, industrialists and marketers of the present country of the expertise and its utilization.
The so much accomplished resource on polymer blends on hand at the market
Offers a whole and well timed evaluation of the topic
Each article provides brand new examine & improvement on a subject matter and its simple rules and functions, integrates case reviews, laboratory and pilot plant experiments, and provides due connection with released and patented literature
Equips teachers, scientists and researchers with wisdom of basics ideas and their functions, and informs the engineers, industrialists and marketers concerning the cutting-edge know-how and its applications
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Extra resources for Encyclopedia of Polymer Blends, Volume 3: Structure
Whether the KCMs provide the correct theoretical framework to explain the glass transition is highly debatable. Among their serious shortcomings stands out the fact that neither glass-transition’s phenomenology related to thermodynamics is acknowledged nor are the nontrivial static correlations (argued to accompany the increase of relaxation time in fragile glass formers) properly addressed. Furthermore, these models provide no informa tion either on the slow β-relaxation or on fast relaxation processes and pertinent anomalous vibrations, and, more importantly, on their acknowledged ties to the structural relaxation mechanism.
2 Phenomenology and Theories of the Glass Transition By combining Eqs. 21) The constant B was found by Doolittle to be of the order of unity. A direct com parison between Eqs. 8 × 10 4 K 1). 009 for most polymers). Several equation-of-state models, such as the statistical–mechanical Simha–Somcynsky hole theory , permit the determination of Vf. The latter, however, is better determined experimen tally, given the serious discrepancies often encountered in theoretical deriva tions . 11, in reasonable agreement with theoretical estimates [104,110].
A thermodynamic perspective to the glass-transition phe nomenon may be provided by considering the glass as a thermodynamic phase, an assumed “fourth state of aggregation of matter” . The assumption of an under lying true second-order phase transition (in the Ehrenfest notation), due to a change in the conﬁgurational entropy, has led to various phenomenological entropic treatments, most notably the Gibbs–DiMarzio  and Adam–Gibbs  theories. Strong motivation for their development provided the crisis that emerges when the entropy of a supercooled liquid is extrapolated toward low temperatures.