[en] Biphasic Cs and Ba carboxylated polystyrene ionomers were blended with chemically identical mono- and bifunctional oligomers whose chain lengths are significantly greater than the average segmental length between ionic groups in the ionomer. The ionomers were chosen to have two ion contents such that, in one case, the matrix phase is dominant and, in the other, the cluster phase is dominant. From dynamic mechanical thermal analysis, it was observed that the biphasic morphology of the ionomers is preserved in all blends (containing up to 60 wt % oligomer). The monofunctional oligomers tend to have a mild plasticizing action on the two phases. In the matrix-dominated ionomer, the bifunctional oligomer has an antiplasticization effect at lower oligomer contents; this is attributed to a greater dispersion of ionic aggregates in the matrix phase, accompanied by pinning of the oligomer extremities in multiplets, which prevents plasticizing action. In the cluster-dominated ionomer, the oligomer forms a separate phase, which is related to insufficiently large ion-poor styrene regions in the ionomer to accommodate the long nonionic portion of the oligomer chains.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry Materials science & engineering
Author, co-author :
Plante, Michel; University of Laval, Quebec, Canada > Department of Chemistry > Centre de Recherche en Sciences et Ingénierie des Macromolécules (CERSIM)
Bazuin, C Géraldine; University of Laval, Quebec, Canada > Department of Chemistry > Centre de Recherche en Sciences et Ingénierie des Macromolécules (CERSIM)
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Blends of biphasic ionomers with chemically identical mono- and bifunctional oligomers
Publication date :
17 July 1995
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
Amer Chemical Soc, Washington, United States - Washington
NSERC - Natural Sciences and Engineering Research Council [CA] FCAR - Fonds pour la Formation de chercheurs et l'Aide à la recherche [CA] BELSPO - Politique scientifique fédérale [BE] MEES - Ministère de l’Éducation, de l'Enseignement Supérieur [CA] FWB - Fédération Wallonie-Bruxelles [BE]
Vanhoorne, P., Jérôme, R., Teyssié, P.H.; Lauprêtre, F. Macromolecules 1994, 27, 2548.
Pelzer-Foucart, M. Ph.D. Thesis, Université de Liège, Liège, Belgium, 1988.
Hird, B., Eisenberg, A. J. Polym. Sci., Part A: Polym. Chem. 1993, 31, 1377.
Hird, B., Eisenberg, A. J. Polym. Sci., Part B: Polym. Phys. 1990, 28, 1665.
Kim, J. S., Wu, G., Eisenberg, A. Macromolecules 1994, 27, 814.
Kim, J. S., Jackman, R. J., Eisenberg, A. Macromolecules 1994, 27, 2789.
Kim, J. S., Yoshikawa, K., Eisenberg, A. Macromolecules 1994, 27, 6347.
Broze, G., Jérôme, R., Teyssié, P.H. J. Polym. Sci., Polym. Phys. Ed. 1983, 21, 2205.
Horrion, J., Jérôme, R., Teyssié, P.H.; Marco, C., Williams, C. E. Polymer 1988, 29, 1203.
Plante, M. Ph.D. Thesis, Department of Chemistry, Laval University, Quebec, Canada, 1993.
Tomita, H., Register, R. A. Macromolecules 1993, 26, 2791.
Hird, B., Eisenberg, A. Macromolecules 1992, 25, 6466.
Fox, T. G. Bull. Am. Phys. Soc. 1956, 2, 123.
Murali, R., Eisenberg, A. In Structure and Properties of Ionomers; Pineri, M., Eisenberg, A., Eds.; NATO Advanced Study Institute Series C198; Reidel Publishing Co.: Dordrecht, The Netherlands, 1987; p 307.
Villeneuve, S., Bazuin, C. G. Polymer 1991, 32, 2811.
Tong, X., Bazuin, C. G. J. Polym. Sci., Part B: Polym. Phys. 1992, 30, 389.
Neagu-Plesu, R., Bazuin, C. G. J. Polym. Sci., Part B: Polym. Phys. 1991, 29, 1305.
Douglas, E. P., Waddon, A. J., MacKnight, W. J. Macromolecules 1994, 27, 4344.
Eisenberg, A., private communication.
Kim, J. S., Roberts, S. B., Eisenberg, A., Moore, R. B. Macromolecules 1993, 26, 5256.