Novel poly(etheraroylhydrazides). An example of ?conformationally disordered crystalline? polymers

Avitabile, G.; Gentile, Gennaro; Laurienzo, Paola; Malinconico, Mario; Martuscelli, E.; Riva, F.; Volpe, Maria Grazia

doi:10.1002/(sici)1099-0488(19990715)37:14<1687::aid-polb13>3.0.co;2-b

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…Diacid chloride monomers containing two to seven ether linkages were readily prepared with previously reported procedures20–23 (Scheme ). The general pathway involved four synthesis steps, with global yields of approximately 60%, and all the monomers of this type could be conveniently purified by the recrystallization of suitable solvents.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization, and water sorption properties of new aromatic polyamides containing benzimidazole and ethylene oxide moieties

Ayala

Maya

García

et al. 2004

J. Polym. Sci. A Polym. Chem.

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New polyamides, containing a benzimidazole side group and ethylene oxide moieties in the structural repeat unit, were synthesized by low‐temperature polycondensation. The aim of this design was to obtain polyamides that were more soluble in common organic solvents and hence had better processability than benzimidazole polyamides while maintaining the water sorption properties characteristic of the latter. The results showed that the number of ether linkages of the repeat unit played an important role in the glass‐transition temperature and in the water sorption properties, the polyamides with one or two ethylene oxide units being more hydrophilic than benzimidazole polyamides. However, the length of the ethylene oxide chain played a minor role in the solubility because the second member of the series, with two ether linkages (i.e., one ethylene oxide unit), reached the same level of solubility as those polyamides with more ethylene oxide moieties. No crystallinity was observed by X‐ray and calorimetric measurements for the new polymers. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 112–121, 2005

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Section: Resultsmentioning

confidence: 99%

Synthesis, characterization, and water sorption properties of new aromatic polyamides containing benzimidazole and ethylene oxide moieties

Ayala

Maya

García

et al. 2004

J. Polym. Sci. A Polym. Chem.

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Synthesis, characterization, and properties of new sequenced poly(ether amide)s based on 2‐(4‐aminophenyl)‐5‐aminobenzimidazole and 2‐(3‐aminophenyl)‐5‐aminobenzimidazole

Ayala

Muñoz

Lozano

et al. 2006

J. Polym. Sci. A Polym. Chem.

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A set of new aromatic poly(ether amide)s containing benzimidazole groups and ethylene oxide sequences of different lengths were synthesized and characterized. The new polymers were prepared from two benzimidazole diamines, 2-(4aminophenyl)-5-aminobenzimidazole and 2-(3-aminophenyl)-5-aminobenzimidazole, and various oligo(ethylene oxide)dibenzoyl chlorides. They exhibited good solubility in polar aprotic solvents and glass-transition temperatures in the range of 125-300 8C (the longer the ethylene oxide spacer was, the lower the glass-transition temperature was). The new polyamides were essentially amorphous, as observed by X-ray diffraction measurements and confirmed by differential scanning calorimetry measurements, by means of which no melting endotherm was observed in any case. The decomposition temperatures, as revealed by thermogravimetric analysis in nitrogen, were about 400 8C for all of them, regardless of the length of the ethylene oxide content or the phenylene ring orientation (meta or para) of the diamine moiety. The number of ethylene oxide linkages per repeat unit also determined the water uptake.

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Novel poly(etheraroylhydrazides). An example of ?conformationally disordered crystalline? polymers

Cited by 2 publications

References 27 publications

Synthesis, characterization, and water sorption properties of new aromatic polyamides containing benzimidazole and ethylene oxide moieties

Synthesis, characterization, and water sorption properties of new aromatic polyamides containing benzimidazole and ethylene oxide moieties

Synthesis, characterization, and properties of new sequenced poly(ether amide)s based on 2‐(4‐aminophenyl)‐5‐aminobenzimidazole and 2‐(3‐aminophenyl)‐5‐aminobenzimidazole

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