Synthesis of conjugated polymers by vapor deposition polymerization

Conference · Wed Jul 01 04:00:00 EDT 1998

OSTI ID:20034102

Hsu, C S; Lin, T L

The synthesis of poly(2,5-thienylene vinylene) and poly(4,7-thianaphthene) by vapor deposition polymerization is presented. 2,5-Di(bromomethyl)thiophene was subjected to vapor phase pyrolysis at 550 C to form a reactive intermediate. Upon condensation, the reactive intermediate polymerized spontaneously at a temperature higher than {minus}25 C to produce poly(2,5-thienylene vinylene). The obtained poly(2,5-thienylene vinylene)s were fractionated into THF soluble and insoluble fractions. The number average molecular weights of the THF soluble fractions range from 1,500 to 4,000 as determined by GPC measurements. The obtained polymer shows no glass transition and melting point on the DSC scans. Doping of a poly(2,5-thienylene vinylene) film with I{sub 2} vapor led to a conductivity of 1 x 10{sup {minus}4} S cm{sup {minus}1}. In the second part of this study, 2,3-diethynylthiophene was subjected to vapor phase pyrolysis at 300 C to yield a reactive intermediate, 4,7-dehydrothianaphthene. Upon condensation, the obtained 4,7-dehydrothianaphthene was polymerized spontaneously at a temperature higher than {minus}25 C to produce poly(4,7-thianaphthene). The obtained poly(4,7-thianaphthene) was insoluble in common laboratory solvents and shows also no melting point and glass transition on the DSC scans.

• Research Organization: National Chiao Tung Univ., Hsinchu (TW)
• Sponsoring Organization: National Science Council of Republic of China
• OSTI ID: 20034102
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EXPERIMENTAL DATA
MOLECULAR STRUCTURE
NUCLEAR MAGNETIC RESONANCE
ORGANIC SULFUR COMPOUNDS
POLYMERIZATION
POLYMERS
PYROLYSIS
SYNTHESIS
VAPOR DEPOSITED COATINGS