Novel polyetherurethaneurea elastomers based on alpha , alpha , alpha ', alpha '-tetramethyl-m-xylenediisocyan ate: Synthesis, characterization, processability, and hydrolytic stability

A series of novel polyetherurethaneurea elastomers based on m-TMXDI, polyether macrodiols containing 4, 6, 8, or 10 methylene groups between the ether linkages, and aliphatic and aromatic diamines was prepared by two-step solution polymerization. All the materials were thermally processable at 120-1...

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Bibliographic Details
Published in:Journal of applied polymer science 1993-01, Vol.47 (2), p.199-210
Main Authors: Gunatillake, Pathiraja A, Meijs, Gordon F, Rizzardo, Ezio, McCarthy, Simon J, Chatelier, Ronald C, Brandwood, Arthur, Schindhelm, Klaus
Format: Article
Language:English
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Summary:A series of novel polyetherurethaneurea elastomers based on m-TMXDI, polyether macrodiols containing 4, 6, 8, or 10 methylene groups between the ether linkages, and aliphatic and aromatic diamines was prepared by two-step solution polymerization. All the materials were thermally processable at 120-160 degree C except one that was solvent-castable. Mechanical properties and hydrolytic stability (at neutral pH) were found to depend on the macrodiol and chain extender. Poly(tetramethylene oxide)-based polyetherurethaneureas that were chain-extended with primary aliphatic diamines, other than 1,3-propanediamine, exhibited significantly better mechanical properties than those chain-extended with secondary aliphatic or aromatic diamines. The mechanical properties and hydrolytic stability of polyetherurethaneureas containing poly(hexa-, octa-, or decamethylene oxide) and 1,6-hexamethylenediamine were considerably better than those containing 1,2-ethylenediamine. The hydrolytic stability increased with the increasing C/O ratio of the macrodiol. With poly(hexamethylene oxide)-based materials, the phase separation between soft and hard domains was higher than that of the other materials as determined by DSC.
ISSN:0021-8995