MICROSTRUCTURAL CHARACTERIZATION OF CROSS-LINKABLE P-PHENYLENE TEREPHTHALAMIDE TEREPHTHALIC ACID-DERIVATIVE (PPTA-CO-XTA) COPOLYMER FIBERS

被引:6
作者
JONES, MCG [1 ]
JIANG, T [1 ]
MARTIN, DC [1 ]
机构
[1] UNIV MICHIGAN,DEPT MAT SCI & ENGN,ANN ARBOR,MI 48109
关键词
D O I
10.1021/ma00100a040
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We are studying the microstructure of PPTA-co-XTA copolymer fibers. XTA is a variant of terephthalic acid (TA) with a benzocyclobutene (BCB) cross-linking moiety which becomes reactive above the synthesis and processing temperatures but below the degradation temperature. The fibers were dry-jet wet spun from lyotropic liquid crystalline solutions and heat-treated at various temperatures to induce structural reorganization and cross-linking. The microstructure was examined bywide-angle X-ray diffraction and molecular modeling. The copolymers retain the ability to crystallize and form well-oriented fibers. The BCB units are accommodated by a gradual increase in the distance between hydrogen-bonded sheets, the a dimension of the two-chain unit cell. The BCB units of high XTA content copolymers segregate into (100) planes. The a, b, and c dimensions of the unit cell of un-cross-linked PPXTA are respectively 0.91, 0.47, and 1.24 nm. Cross-linking does not significantly change the diffraction patterns, suggesting that the reaction may occur preferentially within the grain boundaries between crystallites.
引用
收藏
页码:6507 / 6514
页数:8
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