Abstract
AbstractThe preparation of monofunctional 1‐hydroxy cellulose triesters—propionate‐acetate and tributyrate — and subsequent coupling with bis‐(4‐isocyanatophenyl)‐disulfide is described, thus yielding a macrophotoinitiator for radical threeblock copolymer syntheses. Cellulose triester blocks were obtained by hydrogen halide cleavage of fully substituted cellulose esters under esterification conditions. The terminal halide function introduced in this way yields hydroxyl after hydrolysis at medium pH conditions. Evidence of strict monofunctionality has been demonstrated by analysis of molecular weights as well as of molecular weight distributions before and after coupling with stoechiometric amounts of difunctional coupling agents. Viscosity‐molecular weight relationships were extended towards low degrees of polymerization, applying vapour pressure and membrane osmometry for calibration.
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