Synthesis of Hyperbranched 1,4-cis+1,2-Polybutadiene in aControlled One-step way by Using Novel Catalytic DithioSystem

Cobalt Diethyldithiocarbamate + Ethylaluminumsesquichloride used as a catalyst for the synthesis of hyperbranched, low solution viscosity, high molecular weight 1,4-cis-polybutadiene containing 20-40% of 1,2-vinyl bonds. The effect of solvent used, catalyst and monomer concentrations,Al:Co ratio, temperature, polymerization time, polymer microstructure, intrinsic viscosity, molecular mass distribution, branching index on conversion of butadiene were studied as controlling parameters. Polymerization process was carried out in one step by controlled radical-coordination mechanism. The productivity of the used catalyst is 20.0-50.0 kg Polymer/g Co∙h with the 86.0-99.0 % yield ofpolybutadiene. The obtained hyperbranched polybutadiene samples have branching indexes 0.30- 0.75. Synthesized hyperbranched 1,4-cis+1,2-polybutadiene has been used in transdermal drug delivery system.

کلیدواژه ها:

Polymerization ، Catalytic dithiosystems ، Hyperbranching ، Polybutadiene