CHEMICAL MODIFICATION OF BUTYL RUBBER .3. BUTYL RUBBER WITH D-MALTOSEDERIVATIVE AS PENDANT GROUPS

A new type of amphiphilic elastomer was synthesized, which consisted o f butyl rubber and a D-maltose derivative as a backbone and side group s, respectively. The synthesis was accomplished by the sequence of the three following reactions: (1) Hydroxyl groups of D-maltonolactone we re protected by a trimethylsilyl group. (2) The resulting maltonolacto ne derivative was subjected to a reaction with chemically modified but yl rubber having pendant amino groups. (3) The protecting trimethylsil yl groups on the maltose residues were removed by treating with tetra- n-butylammonium fluoride. This new amphiphilic elastomer behaved as a thermoplastic elastomer and showed good mechanical properties. The sac charide segments aggregated in the hydrophobic butyl rubber matrix to form a microphase-separated structure, as confirmed by differential sc anning calorimetry, transmission electron microscopy, small-angle x-ra y scattering, and dynamic mechanical measurements. The aggregated sacc haride domains are estimated to function both as crosslinking sites an d reinforcing fillers in the rubber matrix. (C) 1995 John Wiley & Sons , Inc.