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The Langmuir monolayers of a chloroform soluble dimethoxy substituted precursor poly(p-phenylenevinylene) (PPV) with a methoxy leaving group were studied. During storage in chloroform the precursor polymer is partly converted to PPV. Multilayer films could only be prepared of this partly converted precursor. When a monolayer of this polymer containing 5% PPV units was deposited, an orientation of...