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Blends of Syndiotactic Polystyrene with SBS Triblock Copolymers
Author(s) -
Picchioni Francesco,
Passaglia Elisa,
Ruggeri Giacomo,
Ciardelli Francesco
Publication year - 2001
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(20010701)202:11<2142::aid-macp2142>3.0.co;2-h
Subject(s) - materials science , dynamic mechanical analysis , copolymer , polystyrene , polybutadiene , differential scanning calorimetry , glass transition , polymer chemistry , amorphous solid , polymer blend , composite material , tacticity , thermal analysis , polymer , thermal , chemistry , thermodynamics , crystallography , polymerization , physics
Blending of polystyrene‐ block ‐polybutadiene‐ block ‐polystyrene (SBS) triblock copolymers with syndiotactic polystyrene (PSsyn) has been performed in a Brabender mixer above the glass transition temperature of the triblock copolymer but below the melting point of PSsyn. The presence of a large excess of amorphous SBS (at least 70 wt.‐%) as well as of the amorphous PSsyn phase (about 60 wt.‐%, also above its T g ) allowed the easy mixing of the components. In contrast, the presence of unmelted PSsyn crystallites affects both the final morphology of the blend as well as its dynamic behavior. Indeed, according to the dynamic thermomechanical analysis (DMTA) data it is possible to suggest that such solid particles act to reinforce the overall blend structure (as in composite materials filled with inorganic solid particles). Similar behavior is also observed for the SBS copolymer alone below the T g of the styrene blocks, T g (PS). This conclusion is supported by both the compatibility of the blends, and the thermal and dynamic thermomechanical behavior at T > T g (PS) as investigated by means of Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM) and DMTA. The results obtained are tentatively compared with those of similar blends obtained from toluene solution.