Abstract
This paper reports the effect of solvent properties on the temperature at which nylon 6, polyethylene terephthalate (PET) and polypropylene begin to shrink in about thirty kinds of organic solvents.
An assumption is made that a decreasing effect of shrink-starting-temperature (T1) caused by an absorbed solvents can be represented by a parameter ΔT1/Q : where, Q is a degree of swelling and ΔT1 is a difference of T1 between before and after solvent absorption.
The test results are that :
(1) decreasing effects ΔT1/Q increases with decreasing molecular weight or molecular volume of absorbed solvents,
(2) if absorbed solvents are same in molecular weight or molecular volume, decreasing effect ΔT1/Q of nonpolar solvents is higher than that of polar solvents, and
(3) decreasing effect ΔT1/Q of solvents of noncoplanar structure is lower than that of solvents of coplanar structure.
