Phase Formation And Evolution Of Multiphase Polymer Blends-phase Morphology And Kinetics Of Evolution Of PP/PcBR Blends

In this paper, the relationship between the morphology evolution,phase dispersion kinetics and different blending time, compositions and mixing condition was investigated.The Phase Contrast Microscopy (PCM) patterns were transformed to 2DFT image according to theory on Fourier Transformation.Corresponding parameters were calculated to describe the relationship between the phase evolution and different blending time, compositions.The melt and mixing processes of these blends with different compositions were discussed by small-angle laser scattering (SALS). Some character parameters of SALS were used to discuss the formation of the disperse phase.An online, non-destructive test system, Back small-angle light scattering (BSALS) measurement was applied to the phase-size investigation of polypropyline/polybutadiene(PP/PcBR) immiscible blends in the compounding process. The structure parameters, the correlation distance ac , average chord length L , radius of gyration Rg , and the invariant were obtained by applying the Debye-bueche statistical theory of scattering. The structure parameters and the integral of scattering intensity,,Ji Im hm?1 were used to discuss the phase formation and evolution of the blends. The results demonstrate that in the early stage of blending, the dispersed phase breaks up into smaller pellets significant. With the increase of the mixing time, the fluctuation of average dispersed diameter demonstrating that the coalescence of dispersed phase. In the end stage of the mixing the average of the dispersed phase almost doesn't change, demonstrating that the balance between the break-up and coalescence of dispersed phase. The kinetics of phase dispersion is the function of the composites,temperature and shear rate.