Citation: . CONTROLLED/"LIVING" RADICAL POLYMERIZATION OF STYRENE IN AN AQUEOUS DISPERSION SYSTEM[J]. Chinese Journal of Polymer Science, ;2002, 20(5): 445-451. shu

CONTROLLED/"LIVING" RADICAL POLYMERIZATION OF STYRENE IN AN AQUEOUS DISPERSION SYSTEM

Received Date: 12 October 2001
Revised Date: 26 December 2001

Atom transfer radical polymerization (ATRP) of styrene catalyzed by cuprous (CuX)/1, 10-phenanthroline (Phen)and CuX/CuX2/Phen was conducted in an aqueous dispersed system. A stable latex was obtained by using ionic surfactantsodium lauryl sulfonate (SLS) or composite surfactants, such as SLS/polyoxyethylene nonyl phenyl ether (OP-10),SLS/hexadecanol and SLS/OP-10/hexadecanol. Among which SLS and SLS/OP-10/hexadecanol systems established betterdispersed effect during the polymerization. It was found that Phen was a more syitable ligand than N,N,N′N″,N″-pentamethyldiethylenetriamine(PMDETA) to maintain an appropriate equilibrium of the activator Cu(I) and the deactivator Cu(II) between the organic phase and the water phase.The effect of several initiators(such as EBiB,CCl4 and 1-PEBr) and the temperature on such a kind of ATRP system was also observed.The number-average molar mass(Mn) of polystyrene(PS) increased with the conversion and the molar mass distribution (mw/Mn) remained narrow.These experimental data show that the polymerization could be controlled except for the quick increase of monomer conversion and the number-average molar mass of PS in the initial stage of polymerization.Furthermore,the initiator efficiency was found to be low(～57%) in CuX/Phen catalyzed system.To overcome this problem,Cu(II) X2(20 mol%-50 mol% based on CuX) was introduced into the polymerization system.In this case,higher initiator efficiency (60%-90%),low Mw/Mn of PS (as low as 1.08) were achieved and the molar masses of the PS fit with the theoretical ones.
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