ISSN:
1435-1536
Keywords:
Formation of networks
;
equilibrium modulus
;
solfraction
;
polyurethane networks
;
epoxy networks
;
concentration of elastically active network chains
;
retardation spectrum
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The extraction, viscoelastic, equilibrium mechanical and optical behaviour of polyurethane (prepared from poly (oxypropylene) triols-diisocyanate-monofunctional alcohol or monoisocyanate m the dry or dilute states) and epoxy (prepared from diamine-diepoxide and monoepoxide) networks has been analysed. In all cases, the theory of branching processes adequately describes the network formation and the weight fraction of solW s. The networks are homogeneous and their viscoelastic behaviour has a model character. The equilibrium deformational behaviour of polyurethane networks indicates the presence of an entanglement contribution in the experimental modulus Gr. The Gr values can be adequately described by the theory of branching processes with the chemical,G c and the topological, Gent, contribution to both systems. The deformational behaviour of epoxy networks, however, can also be adequately described by the theory with the front factorA=1, without the entanglement contribution.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01188354
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