Summary
Organophophites are being used with varying degree of effectiveness to suppress transesterification in polyester blends. Using solid state31p 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 about a year, the originally ineffective compound, has become a very effective inhibitor of transesterification in blends containing polyethylene terephthalate, polybutylene terephthalate, polycarbonate, and polyarylate.
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References
J. Devaux, P. Godard, and J.P. Mercier, Polym. Eng. Sci.,22, 229 (1982).
J. Devaux, P. Godard, and J.P. Mercier, J. Polym. Sci., Phys. Ed.,22, 1895 (1982).
J. Devaux, P. Godard, and J.P. Mercier, J. Polym. Sci., Phys. Ed.,22, 1901 (1982).
K.R. Carduner, R.O. Carter, M.F. Cheung, A. Golovoy, and H. van Oene, J. Appl. Polym. Sci., to be published.
M.F. Cheung, K.R. Carduner, A. Golovoy, and H. van Oene, J. Appl. Polym. Sci., to be published.
C.S. Yannoni, Acc. Chem. Res.,15, 201 (1982).
E. Fukushima and S.B.W. Roeder, “Experimental Pulse NMR: Nuts and Bolts Approach”, Addison-Wesley, Ontario, 1981.
K.R. Carduner, J. Magn. Reson.,72, 173 (1987).
K.R. Carduner and R.O. Carter III, J. Magn. Reson., to be published.
C.A. Fyfe, “Solid State NMR for Chemists”, C.F.C. Press, Guelph, Ontario, 1983.
M. Kimura and R.S. Porter, Anal. Calorim.,5, 25 (1984).
M. Kimura, G. Salee, and R.S. Porter, J. Appl. Polym. Sci.,22, 1629 (1984).
D.G. Gorenstein, Prog. NMR Spectros.,16, 1 (1983).
D.E.C. Corbridge, “Phosphorus”, Elsevier, New York, 1978.
M.F. Cheung, A. Golovoy, H. van Oene, and R.O. Carter III, 17th NATAS Conference Proceedings, 822–829, Lake Buena Vista, Florida, October 9–12, 1988.
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Golovoy, A., Cheung, M.F., Carduner, K.R. et al. The influence of aging on the effectiveness of an organophosphite in suppressing transesterification in polymer blends. Polymer Bulletin 21, 327–334 (1989). https://doi.org/10.1007/BF00955926
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DOI: https://doi.org/10.1007/BF00955926