𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Stability of solutions of aromatic polyamides containing carborane units in the main chain

✍ Scribed by Elena A. Gladkova; Vladimír Petrus; Jiří Horský

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
557 KB
Volume
196
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The stability of aromatic polyamide chains containing 1,7‐dicarba‐closo‐dodecaborane units was investigated in dilute solution by viscometry and sedimentation analysis at 25°C. Traces of impurities in dimethylformamide bring about degradation of the polymer and formation of polyanions, which become manifest in the viscosity by the polyelectrolyte effect. Neutral salts suppress this effect. Degradation is not hindered in an inert atmosphere. The solutions in N,N‐dimethylacetamide and N‐methyl‐2‐pyrrolidone are also unstable. No degradation occurs in solutions in tetrahydrofuran stabilized with 2,6‐di‐tert‐butyl‐4‐methylphenol. Hence, reliable measurements of the molecular characteristics of this polymer can be carried out only in stabilized peroxide‐free tetrahydrofuran.

📜 SIMILAR VOLUMES

Synthesis and characterization of aromat
Synthesis and characterization of aromatic polyamides containing S-triazine rings in the main chain
✍ A. D. Sagar; M. M. Salunkhe; P. P. Wadgaonkar; B. D. Sarawade; S. S. Mahajan 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 187 KB 👁 2 views

Ten new aromatic polyamides containing s-triazine rings in the main chain were synthesized by the low temperature interfacial polycondensation technique involving the reactions of each of the two s-triazine containing diacylchlorides, viz., 2,4-bis (4-chlorocarbonylphenoxy)-6-methoxy-s-triazine and

Synthesis, characterization, and thermal
Synthesis, characterization, and thermal studies of polyamides and polyimides containing two silarylene units in the main chain
✍ L. H. Tagle; C. A. Terraza; A. Leiva; F. Devilat 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 311 KB 👁 2 views

## Abstract Polyamides (PAs) and polyimides (PIs) containing two silarylene units were synthesized and characterized by their spectroscopic properties. Bis(4‐aminophenyl)methylphenylsilane was employed as a unique diamine, whereas acid dichloride and dianhydride monomers contained combinations of m

Synthesis of Polyolefins Containing Sila
Synthesis of Polyolefins Containing Silacycloalkane Units in the Main Chain, 1
✍ Naofumi Naga 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 135 KB

## Abstract Summary: Copolymerizations of ethylene and disubstituted diallylsilanes (CH~2~CHCH~2~)~2~R~2~Si (R = CH~3~, C~6~H~5~) have been investigated with various zirconocene catalysts using methylaluminoxane as a cocatalyst. The bridged stereospecific catalysts showed a higher reactivity for

Synthesis and characterization of new po
Synthesis and characterization of new polyamides containing p-phenylenediacryloyl moieties in the main chain
✍ Khalil Faghihi; Howra Naghavi 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 246 KB 👁 2 views

## Abstract Six new polyamides **8a–f** containing __p__‐phenylenediacryloyl moieties in the main chain were prepared by the direct polycondensation reaction of bis(__p__‐amidobenzoic acid)‐__p__‐phenylene diacrylic acid **6** with 1,4‐diphenylene diamine **7a**, 1,3‐diamino toluene **7b**, 1,5‐dia