Extended polymeric interfaces studied by 1H-13C HETCOR applying Lee Goldburg homonuclear decoupling

Heteronuclear (1H-13C) correlation (HETCOR) expts. coupled with magic angle spinning (MAS) and phase modulated Lee-Goldburg (PMLG) decoupling were used to study nanocomposite materials. The nanostructured materials have high melting temp. and are based on poly(1,4-cis-butadiene) (Europrene NEOCIS BR 60) and poly(tetrahydrofuran) (PTHF, Mn 2900, Terathane DuPont) in a self-assembled arom. host, tris(o-phenylenedioxy)-spiro-cyclotriphosphazene (TPP) and perhydrotriphenylene (PHTP). The PMLG HETCOR expts. provide highly resolved spectra in the proton dimension and are particularly well suited for studying nanocomposite materials. When small amts. of host was mech. dispersed in poly(1,4-cis-butadiene) rubber, 2D-HETCOR data indicate formation of nanocrystals of inclusion compd. in bulk rubber. A neat upfield shift was obsd. for protons of polymer chains included in the unusual anisotropic environment of arom. rings of the host and lining the nanochannel walls.