The properties of polyolefins modified with PET powder

Abstract

The polyolefin and poly(ethylene terephthalate) (PET) products are the mostly current communal waste materials. The waste polymeric materials are generally difficult to separate, and therefore a processing of nonseparated materials presents an interesting alternative suggestion. The aim of our work was to analyze the possibility of reprocessing of polyolefins by a relative low temperature, and to study the effect of addition of PET solid powder on processing and application properties. The results of our investigations allow to conclude that the solid PET powder may play a role of a heterogeneous nucleator, acting as an a-phase promoter of an isotactic polypropylene.

Fasciitis as a common lesion of dermatomyositis, demonstrated early after disease onset by en bloc biopsy combined with magnetic resonance imaging

“…On the contrary, a slight but marked increase of the crystallization temperature of iPP in composites with 1 and 1.5 wt % containing the PET powder was noted. As it was indicated earlier, the PET solid powder may be an origin of a heterogeneous nucleation of iPP, where the evidence of this effect is usually demonstrated by an increase of the crystallization temperature, creation of a fine spherulitical morphology,9, 15, 40 and sometimes modification of the crystal structure. This is probably the case in our investigation; e.g., the increase of crystallization temperature of iPP, in the presence of solid PET powder, may prove an effect governed by the existence of a heterogeneous nucleation.…”

A novel functional MgO ∙ SiO2/polyhedral oligomeric silsesquioxane hybrids as an active filler of polypropylene

“…The extrudate was solidifi ed by quenching it in a water bath, maintaining 10-15°C. After that it was chopped into pellets using plastic granulator and dried for 8 h at 80 o C. A single-screw extruder with a slit die (width 120 mm and slit h = 0.5 mm) and a pull-out line with a chill roll cooling unit was used to produce fi lms from all blends by slit die extrusion 18 . The following parameters were set up on the fi lm extrusion line: a screw rotation speed of 25 rpm, a barrel-die temperature of 230°C, a pullout velocity of 0.011 m/s and a chill roll temperature of 35°C.…”

Effect of tetrasilanolphenyl silsesquioxane on properties of sorbitol derivative-nucleated polypropylene cast films

“…Isotactic polypropylene (iPP) was mixed with 0.25 wt-% DMDBS (iPP/DMDBS), in the case of a reference sample, and additionally with 0.25 or 0.5 wt-% of phPOSS (iPP/DMDBS/phPOSS), in case of the modified samples, in the molten state according to the procedure described in the literature [28]. Cast film samples were formed in a single screw extruder Fairex with a screw diameter d = 30 mm, screw length and diameter ratio l/ d = 25, equipped with a flat slit die and chill roll device with a drum diameter of 0.265 m (Proma, Poland), as detailed in work [36]. The technological process was realised under die temperature of 230°C, constant screw rotating speed of 25 rpm, drum temperature of 80°C, and chill roll rotational speeds of 5, 10, and 15 rpm.…”