Polish version

Login form

register


Print

K. Borlel, P. Szewczyk


Dependence of the processing properties of PVC-s compositions on molecular weight and grain morphology of polymer


Polimery 1993, No 12, 578


DOI: dx.doi.org/10.14314/polimery.1993.578

Summary

Four grades of suspension PVC (Polanvil S58, S67 and S70, and Tarwinyl S67) differing in their molecular weight were the object of physicochemical studies and the unplasticized compositions of these polymers — of plastographic studies. To make use of the essential morphological differences (degree of porosity) observed for grains of various grades of Polanvil resins there were also prepared compositions containing mixtures of Polanvil S58 and Polanvil S70 in weight ratios of 1:3, 1:1, and 3:1. The results of plastographic determinations revealed a quantitative effect of both molecular weight and degree of porosity of PVC grains on the thermal and energetic parameters of the individual stages of the gelation process. A substantial effect on the processing properties of unplasticized PVC compositions have pores with diameters in the range of 100—500 nm. The higher is grain porosity in this range of diameters, the lower is the total energy of plasticization of PVC-S grades with similar molecular weights. On the other hand, in spite of increasing porosity of grains, the total energy of plasticization increases with increasing molecular weight of polymer. Four grades of suspension PVC (Polanvil S58, S67 and S70, and Tarwinyl S67) differing in their molecular weight were the object of physicochemical studies and the unplasticizcd compositions of these polymers — of plastographic studies. To make use of the essential morphological differences (degree of porosity) observed for grains of various grades of Polanvil resins there were also prepared compositions containing mixtures of Polanvil S58 and Polanvil S70 in weight ratios of 1:3, 1:1, and 3:1. The results of plastographic determinations revealed a quantitative effect of both molecular weight and degree of porosity of PVC grains on the thermal and energetic parameters of the individual stages of the gelation process. A substantial effect on the processing properties of unplasticizcd PVC compositions have pores with diameters in the range of 100—500 nm. The higher is grain porosity in this range of diameters, the lower is the total energy of plasticization of PVC-S grades with similar molecular weights. On the other hand, in spite of increasing porosity of grains, the total energy of plasticization increases with increasing molecular weight of polymer.


If you are interested in full versions of articles, please contact the editorial team of polimery@ichp.pl