Approximate relations among compliance functions of linear viscoelasticity for amorphous polymers

Autor:	Hershel Markovitz, Evaristo Riande
Rok vydání:	1975
Předmět:	Shear (sheet metal) chemistry.chemical_classification Angular frequency Materials science Creep chemistry Dynamic modulus General Engineering Thermodynamics Polymer Constant (mathematics) Viscoelasticity Amorphous solid
Zdroj:	Journal of Polymer Science: Polymer Physics Edition. 13:947-951
ISSN:	1542-9385 0098-1273
DOI:	10.1002/pol.1975.180130506
Popis:	In the glass–rubber transition region of viscoelastic behavior of amorphous polymers, it is found that is a good first approximation. Here J(t) is the value of the shear creep compliance at time t and J″(1/t) is the value of the shear loss compliance at an angular frequency of 1/t. Previous approximations related the creep compliance to the storage compliance. When J(t) is proportional to tm, where m is a positive constant, J″(1/t) is within 30% of J(t) for m > 0.6. Over the entire range, is a better approximation than either of the other two. The relaxation modulus G(t) is hardly ever a good approximation for the loss modulus G″(1/t).
Databáze:	OpenAIRE
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