SYNTHESIS AND PROPERTIES OF POLY-p-BENZAMIDE/ POLY(PROPYLENE OXIDE) BLOCK COPOLYMERS

摘要

Conslderabc effort has been expended on the. preparation -ltd characterization of aromatic polymers for applications '(quiring properties such as high thermal stability and high Itnsile properties. Depending on the applications, some of the characteristics ' of these polymers may be advantageous while olbers mi; be disadvantageous. Thus, a high thermal stability implies a high temperature for the processing of such polymers "d 31 a ttriols with a high modulus may show an excessive rlgldty.1'2 To avoid these disadvantages and to improve the properties, block copolymers have been synthesized,3 >* . combining rigid block with another block that is flexible. A ri{id block polymer that may be used is based based on poly(p-tinzamide), I'BA, a polymer that shows high thermal stability ind can be processed via a lyotropic solution?-7 to yield fibers Saving ultra high-strength/high-modulus.