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Chain Extension of Carboxy‐Terminated Aliphatic Polyamides and Polyesters by Arylene and Pyridylene Bisoxazolines
Author(s) -
Néry Laurent,
Lefebvre Hervé,
Fradet Alain
Publication year - 2004
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200300054
Subject(s) - polymer chemistry , molar mass , oligomer , oxazoline , arylene , adipate , differential scanning calorimetry , polymer , polyamide , chemistry , polyester , gel permeation chromatography , end group , materials science , polymerization , organic chemistry , aryl , thermodynamics , catalysis , alkyl , physics
Summary: The bulk reactions between carboxy‐terminated polyamide‐12 ( PA12 ) or carboxy‐terminated poly(butane‐1,4‐diyl adipate) ( PBDA ) and 2,2′‐(1,3‐phenylene)bis(2‐oxazoline) ( mbox ), 2,2′‐(1,4‐phenylene)bis(2‐oxazoline) ( pbox ), 2,2′‐(2,6‐pyridylene)bis(2‐oxazoline) ( pybox ) as chain‐coupling agents were studied by size exclusion chromatography, carboxy end‐group titration, and NMR spectroscopy. The chain‐coupling reaction yielded high‐molar mass polymers within 20 to 180 min, depending on reaction temperature, starting oligomer molar mass, bisoxazoline/oligomer molar ratio, and the nature of bisoxazoline. No side‐reactions were observed. Bisoxazoline pybox , used for the first time in the bulk chain extension of carboxy‐terminated polymers, exhibited the highest reaction rates. The thermal properties of the resulting polymers, studied by differential scanning calorimetry and thermogravimetric analysis, are also discussed.The reaction of PBDA and PA12 with mbox , pbox , and pybox to give rise to the polymers studied here.