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Home  >  Journal list  >  Polymer Journal  >  Vol.36  No.10 (2004)  >  pp.804-811

Polymer Journal
<<Previous article Vol.36  No.10 (2004)   pp.804 - 811 Next article>>

Syntheses and Properties of Different Degree of Branching Polyamides Derived from an ABB′ Type Monomer, 4-(2,4-Diaminophenoxy) Benzoic Acid

Kun-Li Wang1), Yosuke Inai1), Mitsutoshi Jikei2) and Masa-aki Kakimoto1)
1) Department of Organic & Polymeric Materials, Tokyo Institute of Technology
2) Department of Material-process Engineering & Applied Chemistry for Environments, Akita University


ABSTRACT:  Hyperbranched polyamides with different degree of branchings (DBs) were prepared by different polycondensation conditions from an ABB′ type monomer, 4-(2,4-diaminophenoxy)benzoic acid. Polyamide (PA1) with multi-amino groups prepared in the presence of (2,3-dihydro-2-thioxo-3-benzoxazolyl) phosphonic acid diphenyl ester (DBOP) and triethylamine as condensing agents at room temperature had lower DB of 0.1. Polyamide (PA2) with multi-amino groups prepared in the presence of triphenylphosphite and pyridine as condensing agent at 100 °C had higher DB of 0.2. The free amino groups of both polyamides were modified by acetyl chloride, benzoyl chloride and phthalic anhydride, respectively, to give corresponding modified polyamides. The solubility and thermal properties were not influenced by the different DBs but were influenced by the end groups. Strong films were prepared from polyamides with lower DBs and polyamides with amino groups.


Keyword:
Polyamide/ Modification/ Degree of Branching/ Shape Factor/ Tensile Strength/ ABB′ Monomer

Published online: October 14, 2004
© Copyright, 2004 by The Society of Polymer Science, Japan

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