Molecular mobility in polycyanurate networks investigated by viscoelastic measurements and molecular simulations

The dynamic mechanical behavior of a series of polycyanurate networks has been studied in the glassy state as a function of cyanate conversion. Two relaxations, β and γ, were defined and the Arrhenius dependence and Starkweather treatments were applied. To understand the origin of these sub‐Tg relax...

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Bibliographic Details
Published in:Polymer engineering and science 1997-10, Vol.37 (10), p.1606-1620
Main Authors: Georjon, Olivier, Schwach, Gregoire, Gerard, Jean-François, Galy, Jocelyne, Albrand, Michel, Dolmazon, Rene
Format: Article
Language:English
Subjects:
Measurement
Polymers
Relaxation phenomena
Viscoelasticity
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Summary:The dynamic mechanical behavior of a series of polycyanurate networks has been studied in the glassy state as a function of cyanate conversion. Two relaxations, β and γ, were defined and the Arrhenius dependence and Starkweather treatments were applied. To understand the origin of these sub‐Tg relaxations, molecular modeling (both mechanics and dynamics) was used on model molecules representative of the network structure. Two types of molecular motion were examined: rotation of the phenylene ring and crankshaft of the chain segment between crosslinks (i.e., triazine rings).
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.11809