抄録
In studying the thermal shrinkage of polyethylene oxybenzoate (PEOB), (-CO-_??_-O-CH2-CH2-_??_-O-)n;, fibers made by melt-spinning and drawing, following results have been obtained.
(1) At elevated temperatures, PEOB fibers tend to shrink to a larger extent compared with those from the other crystalline polymers.
(2) The shrinkage takes place very rapidly and is affected mainly by the rate of heating, not by the heating media.
(3) The shrinking tendency or force required to prevent shrinking of PEOB fibers is usually higher than commercial 6-nylon and polyethylene terephthalate fibers.
(4) PEOB fibers can be stabilized by heat treatment for a short time without being allowed to contract at elevated temperatures, and after the treatement no remarkable deterioration of their fiber-properties has been observed.
(5) Crystallization by the heat treatment and the transition of the crystal structure by thermal shrinkage have been ascertained by the interpretation of the X-ray diffraction patterns.
The changes of the molecular configuration by the thermal shrinkage and the stabilization by the heat treatment are discussed.
