Abstract
In order to obtain melt-processable wholly aromatic crystalline polymers, twenty-six new aromatic polyetheresters were synthesized by means of melt-polymerization and their thermal properties (m. p., glass transition temperature, etc.) were measured by DSC. Among these polymers, sixteen crystalline polymers were obtained, which melted in the temperature range of about 260_??_340°C without thermal degradation. These include (1) polymers containing appropriate meta-oriented components and (2) polymers consisting of only para-oriented components and having benzene ring linked with one ester bond. These polymers could be melt-spun and heat-drawn and the tensile properties and thermal stabilities of these fibers were evaluated. It was observed that tenacity and elongation decreased with increase of the crystallinity caused by heat treatment and the degree of this physical deterioration depended on the polymer species and affected the apparent thermal stability.
