Synthesis and properties of aromatic polyamides containing the cyclohexane structure

Preparation and characterization of aromatic polyamides based on a bis(ether-carboxylic acid) or a dietheramine extended from 1,1-bis(4-hydroxyphenyl)-1-phenylethane

“…In general, the T g values depended on the structures of the diamine and diacid moieties and decreased with decreasing rigidity and symmetry of the polymer backbone. This trend was similar to that found in previous papers 21–23.…”

“…Polymers VII c and IX c showed a slightly lower solubility because of their symmetrical and rigid biphenylene segments. Similar to the results reported in our preceding articles,21–23 the two set analogous polyamides VII a–d and IX a–d showed a similar solubility behavior. The high solubility of these polyamides was apparently due in part to the presence of the packing‐disruptive triphenylethane unit in the polymer backbone, which resulted in increased chain packing distances and decreased intermolecular interactions.…”

Preparation and characterization of aromatic polyamides based on a bis(ether‐carboxylic acid) or a dietheramine extended from 1,1‐bis(4‐hydroxyphenyl)‐1‐phenylethane

“…Polymers VII c and IX c showed a slightly lower solubility because of their symmetrical and rigid biphenylene segments. Similar to the results reported in our preceding articles, [21][22][23] the two set analogous polyamides VII a-d and IX a-d showed a similar solubility behavior. The high solubility of these polyamides was apparently due in part to the presence of the packing-disruptive triphenylethane unit in the polymer backbone, which resulted in increased chain packing distances and decreased intermolecular interactions.…”

Superacid-Catalyzed Polycondensation of Acenaphthenequinone with Aromatic Hydrocarbons

“…2,6-Diphenoxybenzonitrile (j) and 2,6-diphenoxybenzoic acid were prepared similar to a published method. 21 Acenaphthenequinone was obtained from Aldrich and purified by sublimation followed by recrystallization with charcoal from chlorobenzene.…”

“…The aromatic hydrocarbons 4,4‘-diphenoxybenzophenone and 1,3- and 1,4-bis(4-phenoxybenzoyl)benzenes were prepared according to published methods , and purified by recrystallization from a benzene−ethanol (1:3, v/v) mixture and NMP, respectively. 2,6-Diphenoxybenzonitrile ( j ) and 2,6-diphenoxybenzoic acid were prepared similar to a published method . Acenaphthenequinone was obtained from Aldrich and purified by sublimation followed by recrystallization with charcoal from chlorobenzene.…”