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Multi-Functional pi-Conjugated Macromolecules Based on Poly(Phenylene Vinylene)
Annual rept. 15 Mar 1993-14 Mar 1994
MASSACHUSETTS UNIV AMHERST DEPT OF POLYMER SCIENCE AND ENGINEERING
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This report is for the period 15 Mar 1993 to 14 Mar 1994 and covers all AFOSR supported research under the P.I.s direction. The principal thrusts of the research are in four relatively disparate areas related only by a polymeric theme conjugated macromolecules thermodynamics of inorganic-organic block copolymers hyperbranched dendritic macromolecules theoretical dielectric strength of polymers. However, because the present grant was the successor to a series of more widely focused AFOSR funding periods the opportunity was taken to complete numerous projects which originated earlier. As a result some forty-six AFOSR-supported manuscripts were published or were in press during the grant period. The focus of attention with respect to conjugated macromolecules was their electroluminescent EL properties. The fact that poly-p-phenylene vinylene PPV displayed EL has been known since 1992, and in the present work, based on many years of AFOSR-supported PPV research, derivatives of PPV were synthesized and characterized in terms of their electro-optical properties. In particular a series of conjugated-nonconjugated multi-block copolymer with extremely promising EL properties were studied and EL devices constructed. In these materials the hard blocks were short, monodisperse, phenylene vinylene oligomers, or derivatives thereof, while the soft block were oligomethylene spacer units designed to impart solubility and film formation to the materials. By varying the nature of the hard block EL emission throughout the visible spectral range was achieved.
APPROVED FOR PUBLIC RELEASE