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Morphology and rheology of poly(methyl methacrylate)‐ block ‐poly(isooctyl acrylate)‐ block ‐poly(methyl methacrylate) triblock copolymers, and potential as thermoplastic elastomers
Author(s) -
Tong J. D.,
Leclère Ph.,
Rasmont A.,
Brédas J. L.,
Lazzaroni R.,
Jérôme R.
Publication year - 2000
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20000801)201:12<1250::aid-macp1250>3.0.co;2-p
Subject(s) - thermoplastic elastomer , copolymer , polymer chemistry , methyl methacrylate , elastomer , materials science , rheology , acrylate , methacrylate , morphology (biology) , poly(methyl methacrylate) , thermoplastic , polymer science , polymer , composite material , biology , genetics
The phase morphology and rheological properties of a series of poly(methyl methacrylate)‐ block ‐poly(isooctyl acrylate)‐ block ‐poly(methyl methacrylate) triblock copolymers (MIM) have been studied. These copolymers have well‐defined molecular structures, with a molecular weight (MW) of poly(methyl methacrylate) (PMMA) in the range of 3 500–50 000 and MW of poly(isooctyl acrylate) (PIOA) ranging from 100 000 to 140 000. Atomic force microscopy with phase detection imaging has shown a two‐phase morphology for all the MIM copolymers. The typical spherical, cylindrical, and lamellar phase morphologies have been observed depending on the copolymer composition. MIM consisting of very short PMMA end blocks (MW 3 500–5 000) behave as thermoplastic elastomers (TPEs), with however an upper‐service temperature higher than the traditional polystyrene‐ block ‐polyisoprene‐ block ‐polystyrene TPEs (Kraton D1107). A higher processing temperature is also noted, consistent with the higher viscosity of PMMA compared to PS.