جستجوی مقالات مرتبط با کلیدواژه « Blend » در نشریات گروه « شیمی »

The work entails the viscometric study of a common plant gum found in Nigeria (Acacia Senegal) blended with polyacrylamide (PAM). The gum was purified after collected and mixed in specific ratios of 10:90, 30:70, 50:50, 70:30 and 90:10 with PAM, before they were subjected to rheological study. The intrinsic, relative and specific viscosity for the bends were determined and presented in the research work. The plots of the relative viscosity against concentration of the gums at different temperature vary significantly at higher concentration, while the viscosity for gum Arabic/PAM (90:10) showed the most distinct variation between different temperatures. The result was found to be agreement with some other similar research in the literature. PAM was found to be more viscose than gum Arabic at both temperatures, while the viscosity index such as intrinsic, specific and relative viscosity for the synergistic combination between the polymers were found to decrease as we increased the composition of gum Arabic within the blend.

Polypropylene / polystyrene blends containing montmorillonite (MMT) were prepared using a twin screw extruder followed by fiber spinning. The melt intercalation of PP and PS alloys was carried out in the presence of a compatibilizer such as maleic anhydride-g-polypropylene (MPP). The crystallization morphology, thermal behaviors and mechanical properties of polypropylene/polystyrene (PP/PS) nanoclay blends nanocomposite fibers were investigated in the present work. The improved adhesion between the phases and fine morphology of the dispersed phase contributed to the significant improvement in the properties and thermal stability of the final nanocomposite materials. On the basis of this result, we describe a general understanding of how the morphology is related to the final properties of OMMT- incorporated PP/PS blends.

Polycaprolactone (PCL) and poly(butylene terephthalate) (PBT) blend was prepared by melt processing. The PCL/PBT blend showed similar morphology with that of pure PCL.The crystallization temperature of PCL was increased by the incorporation of PBT. It was also observed that the peak height in the DSC thermograms decreased and then disappeared by adding 40 % or more PBT which might be due to the transestrification between –OH end groups of PCL and ester groups of PBT. The size of PCL spherulites was about 13 µm which decreased highly in the case of blends due to the nucleation effect. The thermal stability of the PCL/PBT blend was higher than pure PCL.