ISSN:
1435-1528
Schlagwort(e):
Sol-gel transition
;
crosslinkingpolymers
;
relaxation function
;
creep function
;
time constants
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
Abstract In developing a rheological constitutive equation for crosslinking polymers the determination and explanation of time constants are of great importance. For stoichiometrically balanced and imbalanced reactions of polydimethylsiloxane and polyurethane model polymers with appropriate “cross-linkers”, it is shown that the experimental data for the storage and loss moduli are well fitted within a large frequency range by a linear rheological constitutive equation with a truncated power law relaxation function. Special attention is given to the problem of estimating the different time constants. A method is proposed for the determination of the terminal relaxation time (in the case below the gel point) and a characteristic retardation time (in the case above the gel point) from the intersection points of the high and low frequency asymptotes of the storage modulus.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01332925
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