[en] A novel thermoplastic elastomer consisting of a triblock copolymer (MBM) with outer syndiotactic poly(methyl methacrylate) (sPMMA) blocks associated to an inner polybutadiene (PBD) block has been modified by stereocomplexation with isotactic PMMA (iPMMA). Solution cast films of stereocomplexes have been analysed by thermal analysis as a function of the iPMMA/sPMMA (i/s) mixing ratio and the solvent used for the film casting. Although self-aggregation of iPMMA is currently observed, this phenomenon does not occur in solvent cast films of iPMMA with the MBM copolymers. Extent of complexation depends on the i/s mixing ratio and the casting solvent. At a constant i/s ratio, molecular weight of iPMMA has no significant effect on the extent of stereocomplexation. Thermal stability of the stereocomplexes is only affected by the casting solvent, in contrast to tensile strength which is greatly influenced by the mixing ratio of the two PMMA stereoisomers. Tensile strength is increased when increasing amounts of iPMMA are blended with a triblock copolymer of low PMMA content (e.g. 12%). In case of triblocks of high PMMA content (ca. 30% or higher), a low i/s ratio (<l/4) increases the tensile strength, whereas a high i/s mixing ratio (1/2) results in decreasing tensile strength. The same trend is observed for blends of sPMMA-polystyrene (PS)-PBD-PS-sPMMA (MSBSM) pentablock copolymers with iPMMA.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry Materials science & engineering
Author, co-author :
Yu, Jian Ming; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Yu, Yi-Song; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Dubois, Philippe ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Robert ; Université de Liège - ULiège > Centre d'études et de rech. sur les macromolécules (CERM)
Teyssié, Philippe ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Stereocomplexation of sPMMA-PBD-sPMMA triblock copolymers with isotactic PMMA: 1. Thermal and mechanical properties of stereocomplexes
IWT - Flemish Institute for the Promotion of Science-Technological Research in Industry [BE] BELSPO - Politique scientifique fédérale [BE] F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] KU Leuven - Katholieke Universiteit Leuven [BE]
Commentary :
The authors acknowledge Polymer (Elsevier) for allowing them to archive this paper.
Fetters, L. J. and Morton, M. Macromolecules 1969, 2, 453
Morton, M. and Mikesell, S. L. J. Macromol. Sci-Chem. 1993. A7, 1391
Ladd, B. J. and Hogen-Esch, T. E. Polym. Prepr. 1989, 30, 261
Long, T. E., Broske, A. D., Bradley, D. J. and McGrath, J. E. J. Polym. Sci. J. Polym. Chem. Edn 1989, 27, 4001
Kennedy, J. P. and Price, J. L. Polym. Mater. Sci. Eng. 1991, 64
Kennedy, J. P., Price, J. L. and Koshimura, K. Macromolecules 1991, 24, 6567
DePorter, C. D., Ferrence, G. M. and McGrath, J. E. Polym. Prepr. 1993, 34, 574
Morton, M. 'Research on Anionic Triblock Copolymers, Thermoplastic Elastomers' (Eds N. R. Legge, G. Holden and H. E. Schroeder). Munich, Vienna, New York, 1987, p. 67
Fox, T. F.,. Garrett, B. S., Goode, W. E., Gratch, S., Rincaid, J. F., Spell, A. and Stroupe, J. D. J. Am. Chem. Soc. 1958, 80, 1768
Spevacek, J. and Schneider, B. Adv. Colloid. Interface Sci. 1987, 27, 81
Feitsma, E. L., DeBoer, A. and Challa, G. Polymer 1975, 16, 515
Schomaker, E. and Challa, G. Macromolecules 1988, 21, 2195, 3506
Helary, G., Belorgey, G. and Hogen-Esch, T. E. Polymer 1992, 33, 1953
Lemieux, E. Thesis, University Laval, Quebec, 1988
Miyamoto, T. and Inagaki, H. Polym. J. 1970, 1, 46
Ute, K., Miyatake, N., Osugi, Y. and Hatada, K. Polym. J. 1993, 25, 1153
Spevacek, J. and Schneider, B. Makromol. Chem. 1974, 175, 2939
Katime, I. A. and Quintana, J. R. Makromol. Chem. 1988, 189, 1373
Hatada, K., Ute, K., Tanaka, K., Kitayama, T. and Okamoto, Y. Polym. J. 1985, 17, 977
Duering, H., Alberda Van Ekenstein, G. O. R., Challa, G., Mason, J. P. and Hogen-Esch, T. E. Macromolecules 1995, 28, 1952
Yu, J. M., Dubois, Ph., Jéròme, R. and Teyssié, Ph. Submitted to Macromolecules 1996, 29, 6090
Kennedy, M. A., Peacock, A. J., Failla, M. D., Lucas, J. C. and Mandelkern, L. Macromolecules 1995, 28, 1407
Morton, M. and McGrath, J. E. J. Polym. Sci. 1969, C(26), 99
Morton, M. Rubber Chem. Tech. 1983, 56, 1096
Beecher, J. F. and Bradford, R. D. J. Polym. Sci. 1969, C(26), 117
Buter, R., Tan, Y. Y. and Challa, G. J. Polym. Sci. Polym. Chem. Edn 1973, 11, 2973