𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Synthesis and properties of optically active aromatic polyimides derived from optically pure 1,1′-bi-2-naphthol

✍ Scribed by Qiding Mi; Lianxun Gao; Leiming Li; Yu Ma; Xing Zhang; Mengxian Ding

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
262 KB
Volume
35
Category
Article
ISSN
0887-624X

No coin nor oath required. For personal study only.

✦ Synopsis

A series of new optically active aromatic polyimides containing axially dissymmetric 1,1 -binaphthalene-2,2-diyl units were prepared from optically pure ( R)-(/)-or (S)-(0)-2,2-bis(3,4-dicarboxyphenoxy)-1,1 -binaphthalene dianhydrides and various aromatic diamines via a conventional two-step procedure that included ringopening polycondensation and chemical cyclodehydration. The optically pure isomer of dianhydride was prepared by a nucleophilic substitution of optically pure ( R)-(/)or (S)-(0)-1,1-bi-2-naphthol with 4-nitrophthalonitrile in aprotic polar solvent and subsequent hydrolysis of the resultant tetranitrile derivatives, followed by the dehydration of the corresponding tetracarboxylic acids to obtain the dianhydrides. These polymers were readily soluble in common organic solvents such as N,N-dimethylacetamide, N-methyl-2-pyrrolidone, and m-cresol, etc., and have glass transition temperatures of 251-296ЊC, and 5% weight loss occurs not lower than 480ЊC. The specific rotations of the optically active polyimides ranged from /196Њ to /263Њ, and the optical stability and chiroptical properties of them were also studied.

📜 SIMILAR VOLUMES

Synthesis and characterization of optica
Synthesis and characterization of optically active aromatic polyimides derived from 2,2′-bis(2-trifluoro- 4-aminophenoxy)-1,1′-binaphthyl and aromatic tetracarboxylic dianhydrides
✍ Qiding Mi; Yu Ma; Lianxun Gao; Mengxian Ding 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 140 KB 👁 1 views

Optically active 2,2Ј-bis(2-trifluoro-4-aminophenoxy)-1,1Ј-binaphthyl and its corresponding racemate were prepared by a nucleophilic substitution reaction of 1,1Ј-bi-2-naphthol with 2-chloro-5-nitrotrifluorotoluene and subsequently by the reduction of the resulting dinitro compounds. A series of opt

Synthesis and properties of soluble arom
Synthesis and properties of soluble aromatic polyimides from 2,2′-bis(3,4-dicarboxyphenoxy)-1,1′-binaphthyl dianhydride and aromatic diamines
✍ Guey-Sheng Liou 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 152 KB

Aromatic tetracarboxylic dianhydride having crank and twisted noncoplanar structure, 2,2 -bis(3,4-dicarboxyphenoxy)-1,1 -binaphthyl dianhydride, was synthesized by the reaction of 4-nitrophthalonitrile with 2,2 -dihydroxy-1,1 -binaphthyl, followed by alkaline hydrolysis of the intermediate bis(ether

Synthesis and properties of polyimides d
Synthesis and properties of polyimides derived from 1,4-bis(4-aminophenoxy)2,5-di-tert-butylbenzene
✍ Der-Jang Liaw; Been-Yang Liaw 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 174 KB

Novel aromatic polyimides containing symmetric, bulky di-tert-butyl substituents unit were synthesized from 1,4-bis(4-aminophenoxy)2,5-di-tert-butylbenzene (BADTB) and various aromatic tetracarboxylic dianhydrides by the conventional twostage procedure that included ring-opening polyaddition in a po

Synthesis, characterization, and optical
Synthesis, characterization, and optical properties of polymers comprising 1,4-dithiane-2,5-bis(thiomethyl) group
✍ Tsuyoshi Okubo; Shigeo Kohmoto; Makoto Yamamoto 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 353 KB 👁 1 views

To obtain an optical polymer with a high refractive index ( n D ) and Abbe's number (n D ), a series of 1,4-dithiane-2,5-bis(thiomethyl) (DBT) group-bearing poly( Salkylcarbamate) and polyvinylsulfide were synthesized by the polyaddition of 2,5bis(mercaptomethyl)-1,4-dithiane (BMMD) with diisocyanat

Synthesis and properties of ortho-linked
Synthesis and properties of ortho-linked aromatic polyimides based on 1,2-bis(4-aminophenoxy)-4-tert-butylbenzene
✍ Sheng-Huei Hsiao; Chin-Ping Yang; Shin-Hung Chen 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 141 KB 👁 1 views

A bis(ether amine) containing the ortho-substituted phenylene unit and pendant tert-butyl group, 1,2-bis(4-aminophenoxy)-4-tert-butylbenzene, was synthesized and used as a monomer to prepare polyimides with six commercial dianhydrides via a conventional two-stage procedure. The intermediate poly(ami

Synthesis and characterization of new ar
Synthesis and characterization of new aromatic polyesters and a polyether derived from 2,2-bis(4-hydroxyphenyl)-1,2-diphenylethanone
✍ Shinji Watanabe; Hitoshi Murayama; Miki Murata; Yuzuru Masuda; Masaru Tanabe; Yo 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 128 KB 👁 1 views

New polyarylates having benzopinacolone units were synthesized from 2,2-bis(4-hydroxyphenyl)-1,2-diphenylethanone and aromatic dicarboxylic acid chlorides. The polymers having an inherent viscosity of 0.71-0.94 dL/g were obtained by the two-phase method using toluene as an organic solvent. The polym