Abstract
AbstractOn the basis of an isoviscosity criterion for the glass transition (ηg ⋍ 1013 poise) in liquids of low molecular weight, theoretical Tg values were calculated for the n‐alkane series by the equation log η = log A + B/(T − T0), with the use of values reported by Lewis for the parameters. The Tg/T0 ratio reaches a limiting value of 1.25 and ϕg = (Tg − T0)/2.3B = 0.027, a constant. Extrapolation to (CH2)∞ gives Tg = 200°K., T0 = 160°K., and B = 640°K. This Tg is consistent with other estimates for poly‐ethylene, and T0 coincides with the temperature at which the “excess” liquid entropy for (CH2)∞ becomes zero from thermodynamic data. For polymer liquids it is proposed that E0 = 2.3RB is determined by the internal barriers to rotation for the “isolated” polymer chains. Thus, E0 = 2.9 kcal./mole for polyethylene, 3.0 kcal./mole for polystyrene, 5.7 kcal./mole for polyisobutylene, and 1.9 kcal./mole for polydimethylsiloxane.
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Dates
Type | When |
---|---|
Created | 22 years, 4 months ago (April 21, 2003, 2:46 a.m.) |
Deposited | 1 year, 9 months ago (Nov. 1, 2023, 12:49 p.m.) |
Indexed | 1 year, 6 months ago (Feb. 11, 2024, 1:21 a.m.) |
Issued | 57 years, 7 months ago (Jan. 1, 1968) |
Published | 57 years, 7 months ago (Jan. 1, 1968) |
Published Online | 22 years, 5 months ago (March 10, 2003) |
Published Print | 57 years, 7 months ago (Jan. 1, 1968) |
@article{Miller_1968, title={Kinetic interpretation of the glass transition: Glass temperatures of n‐alkane liquids and polyethylene}, volume={6}, ISSN={1542-9377}, url={http://dx.doi.org/10.1002/pol.1968.160060115}, DOI={10.1002/pol.1968.160060115}, number={1}, journal={Journal of Polymer Science Part A-2: Polymer Physics}, publisher={Wiley}, author={Miller, A. A.}, year={1968}, month=jan, pages={249–257} }