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- W2383670135 abstract "Two types of the regular copolymer of poly (1, 4-phenyleneterephthalamide) were synthesized by the low temperature solution polycondensation in NMP-CaCl_2 solvent system, using the piperazine or 2,5-dimethylpiperazine as the third components introduced in the main chain of poly (1, 4-phenyleneterephthalamide). The properties of copolymers were characterized by IR, SEM, X-RAY diffraction, polarizing microscopy, TGA and solubilities.Experimental results showed that the copolymers had good solubility and thermal stability, the concentrated sulfuric acid (～98% ) solution of regular PPTA copolymers had liquid crystalline proper-" @default.
- W2383670135 created "2016-06-24" @default.
- W2383670135 creator A5005682554 @default.
- W2383670135 date "1991-01-01" @default.
- W2383670135 modified "2023-09-28" @default.
- W2383670135 title "STUDIES ON THE REGULAR COPOLYMERS OF POLY (1, 4-PHENYLENETEREPHTHALAMIDE)" @default.
- W2383670135 hasPublicationYear "1991" @default.
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