Synthesis and characterization of 4-cyanobiphenyl-4′-yloxy-functionalized poly(7-oxanorbornene-5,6-exo-dicarboximide)s via ring opening metathesis polymerization (ROMP)
✍ Scribed by Gangadhara; Irène Campistron; Michel Thomas; Danièle Reyx
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 330 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
N-[n-(4-cyanobiphenyl-4Ј-yloxy)
alkyl]-7-oxanorbornene-5,6-exo-dicarboximide (CBON 2 -CBON 8 ) with increasing number of methylene groups in the alkyl part (n ϭ 2-8) were synthesized by Mitsunobu condensation between the appropriate alcohols (CBA 2 -CBA 8 ) and 7-oxanorbornene-5,6-exo-dicarboximide (ON). The conditions for the ring opening metathesis polymerization of CBON n giving acceptable molecular weights and molecular distributions were established. Characterization of the resulting polymers (P 2 -P 8 ) by 1 H-and 13 C-NMR has shown a high trans content. Differential scanning calorimetry and optical microscopy analysis have shown that the alcohols CBA n are thermotropic with some variations between the first and second heating-cooling cycles, the monomers CBON n melt with no evidence of any mesomorphic state, the polymers P n show only the glass transition, and the glass transition temperature (T g ) decreases with increases in the spacer length.