ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
It is a well-known fact that the relaxation spectra in the rubbery region of linear amorphous polymers show “box-type” functions which are characterized by three elements, τe τm and E0, the minimum relaxation time, maximum relaxation time, and height of the curve, respectively. The equation (τm - τe)/log (τm/τe) = 2.303 αMwβ/Er(τe) can be derived by a simple treatment described in this paper. Then log τe = -log E0/α(1 -1/10K) + β log M̄w can be obtained from the above equation for the polymers synthesized by us. According to Fujita's results, however, τm is independent of molecular weight and τm becomes τ3 when M̄w conforms to Mc. For such a case the above equation is transformed into log (τm/τe - 1) - log log τm/τm = β log M̄w/Mc. On the other hand, log τm experimentally obtained was plotted against log M̄w for the same polymers and it was found that the results were raher on the straight line indicated by the former equation than on the curve shown by the latter. Also log (τm + 0.234) = - 5.87 + 1.65 log M̄w was found to be suitable for the polymers in the vicinity of Mc.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1963.100010621