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Layers of two soluble poly(para-)phenylenevinylenes (PPV), one with octoxy (oct-PPV) the other with4-phenoxyphenyl sidechains (DPOP-PPV) are characterised by X-ray diffraction. The oct-PPV layer shows semicrystallinity while the DPOPPPV layer is in an amorphous state. The crystallinity of oct-PPV is about 20%. The crystalline and the amorphous state of oct-PPV show similar features: i) the octoxy...
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