Cationic polymerization of bis(1‐alkylvinyl)benzenes and related monomers, 3. Telechelics containing indane units

Abstract

The synthesis and characterization of linear telechelics containing l1I,3-trimethylindane units via cationic polymerization is described. 1,4-Diisopropenylbenzene (1) was polymerized in the presence of 1 -isopropenyl-4-methylbenzene (3 a) to give a polyindane with methyl end-groups, which was then oxidized to the corresponding carboxy-telechelic polymer. As an alternative route for the preparation of polymers with indane units in the main chain, the step growth polymerization of suitably substituted indane derivatives was studied. In this way a polyindane with amino end-groups was synthesized. It melts at 172 "C and in DSC is stable up to ca. 300 "C. a) Part 2: cf.@. b, Part of the diploma thesis. Preparation of telechelics by cationic polymerization of 1,4-diisopropenylbenzeneThe treatment of a mixture of 1 and 3 with Brsnsted or Lewis acids yields telechelics having reactive end-groups. This can be explained on the basis of the following reaction mechanism in analogy to the step-growth mechanism of the polyindane synthesis '1. a) Mole ratio 3 a : 1 = 2 : 1 in the synthesis of 4 a, and 1 : 1 for 4 b.

Sandwich Complex‐Containing Macromolecules: Property Tunability Through Versatile Synthesis

“…Polymerization of monomers that feature a pendent sandwich complex is an exploited synthetic approach to macromolecules with pendent sandwich complex. For instance, vinylferrocene was successfully polymerized to poly(vinylferrocene) under radical, [ 66,188,189 ] cationic, [ 190 ] anionic, [ 128,189,191 ] and Ziegler-Natta catalyst [ 190 ] polymerization conditions. Pittman et al reported an AIBNcatalyzed, free-radical polymerization of vinylferrocene ( 141 ) in benzene (Scheme 28 ).…”