Electrical Conductivity of Multiwalled Carbon Nanotube/Acrylonitrile Butadiene Styrene Polymer Nanocomposites prepared by Melt Mixing: Comparison of Twin Screw Extrusion and Batch Mixing

In this paper, study of preparation and testing of polymer nanocomposites (PNC) based on polypropylene matrix and montmorillonite nanofillers is described. Samples were prepared by twin-screw extrusion and injection molding to final shape. Changes of basic properties of these PNC ́s were tested and described in main part of this article.

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On secondary recycling of ZrO2-reinforced HDPE filament prepared from domestic waste for possible 3-D printing of bearings

Journal of Thermoplastic Composite Materials ◽

10.1177/0892705719864628 ◽

2019 ◽

pp. 089270571986462 ◽

Cited By ~ 4

Author(s):

Rupinder Singh ◽

Ranvijay Kumar ◽

Shubham Tiwari ◽

Shubham Vishwakarma ◽

Shivam Kakkar ◽

...

Keyword(s):

Acrylonitrile Butadiene Styrene ◽

Melt Flow Index ◽

Melt Processing ◽

Thermoplastic Composites ◽

Flow Index ◽

Wear Properties ◽

Twin Screw Extrusion ◽

Screw Extrusion ◽

Twin Screw ◽

Recycled Hdpe

In this study, an innovative route for secondary recycling (with zirconium oxide (ZrO2) reinforcement) has been proposed based on melt processing of high-density polyethylene (HDPE) in low-temperature bearing applications. Initially, secondary recycled HDPE, acrylonitrile butadiene styrene, and nylon 6 thermoplastic composites were investigated for melt flow index (MFI) according to ASTM D1238 standard. Based on the acceptable MFI, secondary recycled HDPE matrix was selected for second-stage processing on twin screw extrusion (TSE). The final process involves reinforcement of ZrO2 into HDPE matrix by TSE in 60:40 ratio (by weight %) for preparation of feedstock filament (for possible 3-D printing of bearings). The results of the study suggest that for processing of HDPE, 40% ZrO2 composite matrix, 50 r min−1 screw speed, 190°C barrel temperature, and 15 kg applied load are the best setting of TSE (for maximizing the tensile strength of feedstock filament). The results are also supported by wear properties, thermal stability, and morphological analysis (based on scanning electron microscopy and electron-dispersive X-ray analysis).

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Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion

Polymers ◽

10.3390/polym12061333 ◽

2020 ◽

Vol 12 (6) ◽

pp. 1333 ◽

Cited By ~ 2

Author(s):

Olga Mysiukiewicz ◽

Mateusz Barczewski ◽

Katarzyna Skórczewska ◽

Danuta Matykiewicz

Keyword(s):

Molecular Weight ◽

Processing Parameters ◽

High Mass ◽

Flow Index ◽

Processing Temperature ◽

Color Analysis ◽

Twin Screw Extrusion ◽

Melt Mixing ◽

Screw Extrusion ◽

Twin Screw

This article presents the effect of twin-screw extrusion processing parameters, including temperature and rotational speed of screws, on the structure and properties of four grades of polylactide (PLA). To evaluate the critical processing parameters for PLA and the possibilities for oxidative and thermomechanical degradation, Fourier-transform infrared spectroscopy (FT-IR), oscillatory rheological analysis, and differential scanning calorimetry (DSC) measurements were used. The influence of degradation induced by processing temperature and high shearing conditions on the quality of the biodegradable polyesters with different melt flow indexes (MFIs)was investigated by color analysis within the CIELab scale. The presented results indicate that considering the high-temperature processing of PLA, the high mass flow index and low viscosity of the polymer reduce its time of residence in the plastifying unit and therefore limit discoloration and reduction of molecular weight due to the degradation process during melt mixing, whereas the initial molecular weight of the polymer is not an essential factor.

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