Study On In Situ Alloy Of Polypropylene/Polystyrene(Styrene)

Polypropylene/polystyrene blends, polypropylene/polystyrene with compatilizerblends and polypropylene/styrene blends were prepared in this dissertation.Investigations on phase formation and evolution of these polymer blends have beenundertaken.SEM has been employed to investigate phase structure of all these polymer blends.The dynamical evolution of SEM patterns was discussed by character length theory.The distribution of character length was proven to be log-normal distribution byfigure-estimation theory. Furthermore, the parameter σ of log-normal distributionwas calculated by linear regression, which is an effective parameter to characterize thedynamics of phase dispersion. In addition, the fractal dimension, , which cancharacterize the phase dispersion degree, was deduced.The melt mixing processes of these blends with different fractions and mixingtimes were discussed by Small Angle Laser Scattering (SALS). Some characterparameters of SALS (Integral invariant;Correlation distance et al.) were usedto discuss the mechanism of the phase dispersed dynamics. The results were accord tothat of SEM.The formation and evolution on phase behavior and morphology of PP/PSimmiscible blends during melted and mixing was discussed in this paper. The PhaseContrast Microscopy (PCM) patterns in real space were transformed into patterns inwave-number space by 2-dimensional Fourier transformation (2DFT). The evolutionlaw of patterns during melt mixing was discussed. Compare the result with that ofSALS and SEM, it can be found that the Fourier transformation is an effective methodto study the phase structure. The mechanical properties of the polymer blends were tested. The results provedthat the mixing time and the content of the compatilizer will influence the finalmechanical of the blends.