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High α transitions of new polyamides based on diamantane

✍ Scribed by Yaw-Terng Chern; Wen-Liang Wang

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
306 KB
Volume
36
Category
Article
ISSN
0887-624X

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✦ Synopsis

A series of new polyamides were synthesized by direct polycondensation of the 1,6-bis(4-aminophenyl)diamantane with various dicarboxylic acids. The soluble polyamides had high inherent viscosities, ranging from 0.73 to 1.21 dL/g. Polyamides derived from 5-tert-butylisophthalic acid and ( {)-1,3-cyclohexanedicarboxylic acid were soluble in N-methyl-2-pyrrolidone (NMP) and pyridine. When NMP and N-dimethylacetamide (DMAc) were added with 3% (w/v) LiCl, the solubilities of polyamides derived from 4,4 -oxybis(benzoic acid) and cis-1,4-cyclohexanedicarboxylic acid were markedly enhanced. Polyamides had tensile strengths of up to 87.8 MPa, elongation to breakage values of up to 19.3%, and initial moduli of up to 2.1 GPa. Dynamic mechanical analysis (DMA) reveals that the polyamides have three relaxations. Their a relaxations occurred at high temperatures, ranging from 380 to 462ЊC. Three of polyamides exhibited good retention of storage modulus (above 10 8 Pa) at a temperature exceeding 410ЊC.

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