ABSTRACT
As a disperse filler we used aerosilogel silochromium C-80 with specific surface 67 m2/g and average size of pores 50nm. The surface of aerosilogel contains significant amount of silanol groups which easily may undergo chemical modifying. Methods of grafting of spin markers to the surface
ofsilochromiumaredescribedinworks[7,8]indetails.Theterminalstructureofspinmarkerhas thefollowingform:
CH3 H3
ConcentrationofspinmarkersonthesurfaceoffillerdeterminedbyEPRspectrawas~3-1017 spin/g.Atuniformdistributionsuchconcentrationcorrespondstoonemarkeronthesquare 200nm2•Investigatedpolymersystemscontainedupto15mass%offiller.Intheworkwealso usedspinprobes-stablenitroxylradicalsstatisticallydistributeduponpolymermatrix.Structure formulasofprobesarepresentedbelow:
~9 CH3CH3
RadicalIIRadicalIII RadicalIIIpossessingchargedgroupsiswelladsorbedonthesurfaceofparticlesofmineral
fillerandmayserveasbothprobe(forexample,inunfilledmatrixes)andmarkerstronglybonded withsurfaceoffillerbyionicforces[2-3].
