POLYMER NANOCOMPOSITES
Miriam Rafailovich, Jonathon Sokolov, Harry L. Frisch and Nan-Loh
Yang*, NSF Garcia MRSEC for Polymers at Engineered interfaces,
NY.USA Polyaniline (PANI) zeolite composites have been prepared by
oxidative polymerization of aniline in the presence of zeolite 13X,
producing composite materials with PANI/zeolite weight ratios from
about 0.5 to 55. The DC con- ductivity of the composite materials
decreased exponentially with zeolite weight fraction. Pure PANI was
paramagnetic while the PANI/zeolite complexes with weight ratios
larger than 20 showed an appreciable antiferromagnetic component as
indicated by temperature dependence of their electron spin resonance
spectra. This novel antiferromagnetism is speculated to arise from
[image001.gif] -dimer pairing of PANI chain layers stacking on the
zeolite particle surface Random Copolymers of methyl
methacrylate with polyhedral oligomeric silsesquioxane (POSS) were
synthesized and blended with PS and PMMA homopolymer thin films. The
effects of the POSS on phase segregation was studied using a variety
of complementary techniques. The results showed these copolymers to be
very efficient at compatibilizing immiscible polymer blends.
Compatibilization only occurred if the POSS was grafted onto the
backbone and favorable interaction existed between the POSS functional
groups and the PS homopolymers. The consequences of this
compatibilization were found to be reduced domain size, increased
interfacial width, and greatly improved fracture toughness.

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