The influence of aging on the effectiveness of an organophosphite in suppressing transesterification in polymer blends

Organophosphites are being used with a varying degree of effectiveness to suppress transesterification in polyester blends. Using solid state exp 31 P-NMR it was discovered that for bis(2,4-di-t-butylphenyl)pentaerythritol diphosphite, a conversion of the phosphite group to a phosphonate moiety, pro...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 1989-03, Vol.21 (3), p.327-334
Main Authors: GOLOVOY, A, CHEUNG, M.-F, CARDUNER, K. R, ROKOSZ, M. J
Format: Article
Language:English
Subjects:
Applied sciences
Blends
Exact sciences and technology
Forms of application and semi-finished materials
Polymer industry, paints, wood
Technology of polymers
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Summary:Organophosphites are being used with a varying degree of effectiveness to suppress transesterification in polyester blends. Using solid state exp 31 P-NMR it was discovered that for bis(2,4-di-t-butylphenyl)pentaerythritol diphosphite, a conversion of the phosphite group to a phosphonate moiety, probably via hydrolysis, is a prerequisite for an effective inhibition of transesterification. This conversion occurs readily during melt compounding if the polymers are not completely dry. However, if rigorous drying is employed and phosphite conversion does not occur, then transesterification is not arrested. It was also found that over a long period of time the conversion of the phosphite to a phosphonate takes place at room temperature as well. Thus, after aging for approx 1 year, the originally ineffective compound becomes a very effective inhibitor of transesterification in blends containing polyethylene terephthalate, polybutylene terephthalate, polycarbonate, and polyarylate. 15 ref.--AA
ISSN:0170-0839
1436-2449
DOI:10.1007/BF00955926