Synthesis and characterization of soluble high molecular weight poly(aromatic diacetylenes)
Conference
·
OSTI ID:141754
- AT&T Bell Laboratories, Murray Hill, NJ (United States)
New polymers containing aromatic diacetylenes designed to be more soluble and mechanically flexible and less thermally reactive while retaining the thermoxidative stability of earlier materials are described. Preparations of the new monomers 4,4`-diethynylbenzophenone and 4,4`-bis(3-ethynylphenoxy) 2,2`,3,3`,5,5`,6,6` octafluorobiphenyl are described. Soluble copolymers can be prepared in quantitative yield by Glazer coupling, using several ratios of 1,3-diethynylbenzene and 4,4`-ethynylphenyl ether, and 4,4`-ethynylphenyl ether and 4,4`-bis(3-ethynylphenoxy) 2,2`,3,3`,5,5`6,6`octafluorobiphenyl. Only the copolymer containing 3:1 1,3-diethynylbenzene: 4,4`-diethynylbenzophenone is soluble in o-dichlorobenzene. The molecular weights of ones series of polymers are changed by addition of varying quantities of monofunctional phenylacetylene. Six exclusion chromatography of the copolymers versus polystyrene standards yields M{sub n}`s and M{sub w}/M{sub n}`s from 5000 to 46,700 and 2.51 to 4.84, respectively. The polymers crosslink thermally and give peak exotherm temperatures ranging from 228 to 285{degrees}C as measured by differential scanning calorimetry. They retain greater than 95% of their mass under N{sub 2} up to 550{degrees} C and form strong, coherent, optically transparent films in thicknesses of 1-20 {mu}m. The physical properties of these materials are under evaluation.
- OSTI ID:
- 141754
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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