Natural Rubber-polyacrylamide Graft 공중합체의 합성

Synthesis of Natural Rubber-g-polyacrylamide Polymer

Natural rubber(NR)-polyacrylamide(PAAm) graft copolymers(GP)(toluene soluble GP : TSGP, water dispersible GP : WDGP) have been synthesized as coupling agents by pre-emulsification methods based on "inverse emulsion graft polymerization" technique. The polymerization was carried out at $65^{\circ}C$ using Azobisisobytyro nitrile(AIBN) as an initiator in the inverse emulsion system formed by inxing NR toluene solution with inverse emulsion of awueous AAm solution emulsified with $Tween^{\#}$ 80 in toluene. The mechanism of inverse emulsion graft copolymerization was studied on AAm conversion, % grafting, grafting efficiency, NR conversion, production ratio of TSGP and amount of GP(sum of TSGP and WDGP). The reaction has been confirmed through use of optical microscope to proceed via adsorption of emulsifier colloid particles onto the stretched NR molecule. From the analysis of the effects of various polymerization conditions on the grafting, it has also been found that the present rection system can easily yield high(over 90%) grafting efficiency and AAm conversion and relatively high(over 80%) NR conversion.onversion.