Premium
Dimensional recovery of cold‐rolled polycarbonate
Author(s) -
Rusch K. C.
Publication year - 1972
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760120407
Subject(s) - polycarbonate , materials science , relaxation (psychology) , viscoelasticity , strain (injury) , stress relaxation , composite material , polymer , glass transition , stress (linguistics) , creep , medicine , psychology , social psychology , linguistics , philosophy
The dimensional recovery of cold‐rolled polycarbonate was measured between 100 and 147°C, and compared to stress‐relaxation data. The strain‐recovery isotherms were superimposed to produce a master curve which could be represented by a distribution function, U (τ), termed the strain recovery spectrum. U (τ) is found to be nearly identical to the relaxation spectrum, H (τ), calculated from the stress‐relaxation master curve; and the shift in U (τ) as a function of temperature, WLF shift factor, is similar to that obtained from other viscoelastic measurements on polycarbonate. For the deformations studied, 25 and 50% reduction in thickness, the recovery behavior is found to be independent of strain (linear), suggesting that nonlinearity in a polymer glass results from large stresses, and not from large strains.