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Morphology and mechanical properties of blends of isotactic or syndiotactic polypropylene with SEBS block copolymers
Author(s) -
Setz Stefan,
Stricker Florian,
Kressler Jörg,
Duschek Thomas,
Mülhaupt Rolf
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960214)59:7<1117::aid-app8>3.0.co;2-h
Subject(s) - tacticity , materials science , copolymer , scanning electron microscope , morphology (biology) , transmission electron microscopy , polypropylene , composite material , annealing (glass) , styrene , polymer chemistry , polymer blend , micrograph , polymer , polymerization , nanotechnology , biology , genetics
Blends of poly(styrene)‐ block ‐poly(ethene‐ co ‐but‐1‐ene)‐ block ‐poly(styrene) (SEBS) with isotactic polypropylene (PP) and syndiotactic PP, respectively, were investigated. The morphology was observed by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The cryofracture surfaces studied by SEM did not show any particles that were pulled out, so that a good compatibility between SEBS and different PPs could be assumed. The multiphase character of the blends could be well detected by TEM of RuO 4 stained samples. TEM micrographs of two‐layer specimens revealed that SEBS tends to diffuse into the PP phase under formation of micelles. The block copolymer shows a reorientation phenomenon of large domains at the interface before the diffusion into the PP phase occurs. The interfacial strength as a function of annealing time was measured by a peel test of two‐layer specimens. Mechanical properties are studied and related to the blend morphology. © 1996 John Wiley & Sons, Inc.