Molecular Engineering of Liquid Crystal Polymers by Living Polymerization. 13.Synthesis and Living Cationic Polymerization of 4-((S(-)-2-Methyl-1-Butyl)Oxycarbonyl)-4'-(omega-Oxyalkyl-1-Vinyl Ether)Biphenyl with Undecanyl and Hexyl Alkyl Groups

摘要

The synthesis and living cationic polymerization of 4-S(-)-2-methyl-1-butyloxycarbonyl-4'(11-oxyundecanyl-1-vinyl ether)biphenyl (12-11) and 4-S(-)-2-methyl-1-butyloxycarbonyl-4'-(6-oxyhexyl-1-vinyl ether)biphenyl (12-6) are described. Polymers with degrees of polymerization from four to twenty six and polydispersities equal and lower than 1.10 were synthesized and characterized by differential scanning calorimetry (DSC) and thermal optical polarized microscopy. When determined from first heating and cooling DSC scans, poly exhibit monotropic SA, SC* and SX (unidentified) mesophases over the entire range of molecular weights. When determined from second and subsequent heating and first and subsequent cooling scans, poly with degrees of polymerization equal to ten and lower than ten exhibit enantiotropic SA, SC* and SX mesophases, and crystallization on the heating scan, while those with higher degrees of polymerization exhibit enantiotropic SA, SC* and SX mesophases only.