Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2006-06-01

Journal: JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY

Included Journals: Scopus、EI、SCIE

Volume: 43

Issue: 7

Page Number: 1043-1050

ISSN: 1060-1325

Key Words: copolyamides; phthalazinone; solubility; thermal properties; tensile properties

Abstract: A series of novel aromatic copolyamides were synthesized by the direct polycondensation of 2-(4-carboxyphenyl)-4-[4-(4-carboxyphenoxyl)phenyl]-phthalazinone (1), terephthalic acid (TPA), and four commercial diamines. The inherent viscosities of the polyamides were between 0.79 greater than or similar to 1.56 dL/g. Introduction of the non-coplanar phthalazinone segments into the main chains remarkably decreased the crystallinity and improved the solubility of the copolyamides. When the percentage of 1 in the diacid monomers was above 50%, the copolymers were soluble in aprotic polar solvents, such as N-methyl-pyrrolidinone and N,N-dimethylacetamide. The copolyamides showed high thermal properties associated with the glass transition temperatures in the range of 276 greater than or similar to 337 degrees C and 10% wt loss temperatures in nitrogen over 496 degrees C. Some polymer films cast from NMP solution had tensile strengths up to 123.4 MPa, initial moduli up to 2.10 GPa, and elongation at break values up to 9.6%.