Investigations for Improving Solid-State Weldability of Dissimilar Thermoplastic Composites Through Melt Processing

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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Fabrication of PVDF/graphene composites with enhanced β phase via conventional melt processing assisted by solid state shear milling technology

RSC Advances ◽

10.1039/c9ra09459h ◽

2020 ◽

Vol 10 (6) ◽

pp. 3391-3401 ◽

Cited By ~ 1

Author(s):

Huili Zhang ◽

Yan Zhu ◽

Li Li

Keyword(s):

Solid State ◽

Melt Processing ◽

Melt Blending ◽

Β Phase

With the assistance of our independently developed solid state shear milling (S3M) technology, PVDF/GP composite with relatively high β phase (42.2%), higher than that directly gotten by melt blending (33.0%), were achieved via common melt process.

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Processing of Melt Flow Compatible Thermoplastic Composites for Solid State Welding Applications

Materials Today Proceedings ◽

10.1016/j.matpr.2019.07.192 ◽

2019 ◽

Vol 18 ◽

pp. 3167-3173 ◽

Cited By ~ 1

Author(s):

Ranvijay Kumar ◽

Rupinder Singh ◽

IPS Ahuja ◽

KN Karn

Keyword(s):

Solid State ◽

Thermoplastic Composites ◽

Melt Flow

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The Use of Solid State NMR to Characterize High Density Polyethylene/Organoclay Nanocomposites

Chemistry & Chemical Technology ◽

10.23939/chcht03.03.187 ◽

2009 ◽

Vol 3 (3) ◽

pp. 187-190

Author(s):

Tathiane Rodrigues ◽

◽

Maria Tavares ◽

Igor Soares ◽

Ana Moreira ◽

...

Keyword(s):

Nuclear Magnetic Resonance ◽

Relaxation Time ◽

Solid State ◽

Magnetic Resonance ◽

High Density Polyethylene ◽

Melt Processing ◽

Proton Spin ◽

High Density ◽

Spin Lattice Relaxation ◽

Nuclear Magnetic

Recently the development of new materials, in special polymeric nanocomposites, formed by polymer and layered silicates, have gained attention. In this work nanocomposites based on high-density polyethylene matrix (HDPE) and organically modified clay were prepared by melt processing and characterized by the determination of proton spin-lattice relaxation time through solid state nuclear magnetic resonance (NMR) spectroscopy. This work has a proposal to add one quantitative technique to help the researchers to better evaluate polymeric nanocomposite, because NMR is an important tool employed to study both molecular structure and dynamic molecular behavior. The nanocomposites were mixed in a twin-screw extruder, varying the shear rate parameter: 60 and 90 rpm at 463 K. Nanocomposites obtained were characterized through X-ray diffraction; thermal analysis; impact resistance and nuclear magnetic resonance. The T1H results showed that the samples present different molecular domains according to the clay dispersion, forming an intercalated and/or exfoliated nanocomposites. The measurement of relaxation time, using low field NMR, is a useful method to evaluate changes in the molecular mobility of nanocomposite and can infer whether the sample is exfoliated and/or intercalated, since lamellar filler is used.

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