scholarly journals Challenges to the industrial melt-processing of conductive plastics

2019 ◽  
Author(s):  
Y. H. Choong Gabriel ◽  
S. A. De Focatiis Davide ◽  
J. Lidgett Mark ◽  
J. Thornton Matthew ◽  
J. Clifford Mike
Keyword(s):  
Melt Processing ◽  
Conductive Plastics

Thermal degradation kinetics of Opuntia Ficus Indica flour and talc-filled poly (lactic acid) hybrid biocomposites by TGA analysis

2021 ◽  
pp. 002199832110082
Author(s):  
Azzeddine Gharsallah ◽  
Abdelheq Layachi ◽  
Ali Louaer ◽  
Hamid Satha
Keyword(s):  
Thermal Stability ◽  
Lactic Acid ◽  
Thermal Degradation ◽  
Degradation Kinetics ◽  
Degradation Mechanism ◽  
Melt Processing ◽  
Thermal Degradation Kinetics ◽  
Poly Lactic Acid ◽  
Opuntia Ficus Indica ◽  
Model Free

This paper reports the effect of lignocellulosic flour and talc powder on the thermal degradation behavior of poly (lactic acid) (PLA) by thermogravimetric analysis (TGA). Lignocellulosic flour was obtained by grinding Opuntia Ficus Indica cladodes. PLA/talc/ Opuntia Ficus Indica flour (OFI-F) biocomposites were prepared by melt processing and characterized using Wide-angle X-ray scattering (WAXS) and Scanning Electron Microscope (SEM). The thermal degradation of neat PLA and its biocomposites can be identified quantitatively by solid-state kinetics models. Thermal degradation results on biocomposites compared to neat PLA show that talc particles at 10 wt % into the PLA matrix have a minor impact on the thermal stability of biocomposites. Loading OFI-F and Talc/OFI-F mixture into the PLA matrix results in a decrease in the maximum degradation temperature, which means that the biocomposites have lower thermal stability. The activation energies (Ea) calculated by the Flynn Wall Ozawa (FWO) and Kissinger Akahira Sunose (KAS) model-free approaches and by model-fitting (Kissinger method and Coats-Redfern method) are in good agreement with one another. In addition, in this work, the degradation mechanism of biocomposites is proposed using Coats-Redfern and Criado methods.

scholarly journals Melt- vs. Non-Melt Blending of Complexly Processable Ultra-High Molecular Weight Polyethylene/Cellulose Nanofiber Bionanocomposite

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 404
Author(s):  
Nur Sharmila Sharip ◽  
Hidayah Ariffin ◽  
Tengku Arisyah Tengku Yasim-Anuar ◽  
Yoshito Andou ◽  
Yuki Shirosaki ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Tensile Strength ◽  
Yield Strength ◽  
Young’S Modulus ◽  
High Molecular Weight ◽  
Melt Processing ◽  
Cellulose Nanofiber ◽  
Melt Blending ◽  
Ultra High Molecular Weight

The major hurdle in melt-processing of ultra-high molecular weight polyethylene (UHMWPE) nanocomposite lies on the high melt viscosity of the UHMWPE, which may contribute to poor dispersion and distribution of the nanofiller. In this study, UHMWPE/cellulose nanofiber (UHMWPE/CNF) bionanocomposites were prepared by two different blending methods: (i) melt blending at 150 °C in a triple screw kneading extruder, and (ii) non-melt blending by ethanol mixing at room temperature. Results showed that melt-processing of UHMWPE without CNF (MB-UHMWPE/0) exhibited an increment in yield strength and Young’s modulus by 15% and 25%, respectively, compared to the Neat-UHMWPE. Tensile strength was however reduced by almost half. Ethanol mixed sample without CNF (EM-UHMWPE/0) on the other hand showed slight decrement in all mechanical properties tested. At 0.5% CNF inclusion, the mechanical properties of melt-blended bionanocomposites (MB-UHMWPE/0.5) were improved as compared to Neat-UHMWPE. It was also found that the yield strength, elongation at break, Young’s modulus, toughness and crystallinity of MB-UHMWPE/0.5 were higher by 28%, 61%, 47%, 45% and 11%, respectively, as compared to the ethanol mixing sample (EM-UHMWPE/0.5). Despite the reduction in tensile strength of MB-UHMWPE/0.5, the value i.e., 28.4 ± 1.0 MPa surpassed the minimum requirement of standard specification for fabricated UHMWPE in surgical implant application. Overall, melt-blending processing is more suitable for the preparation of UHMWPE/CNF bionanocomposites as exhibited by their characteristics presented herein. A better mechanical interlocking between UHMWPE and CNF at high temperature mixing with kneading was evident through FE-SEM observation, explains the higher mechanical properties of MB-UHMWPE/0.5 as compared to EM-UHMWPE/0.5.

Melt processing of (Nd, Y)BaCuO and (Sm, Y)BaCuO composites

1997 ◽  
Vol 10 (3) ◽  
pp. 167-167 ◽  
Author(s):  
P Schätzle ◽  
W Bieger ◽  
U Wiesner ◽  
P Verges ◽  
G Krabbes
Keyword(s):  
Melt Processing

scholarly journals Degradation of PLA/ZnO and PHBV/ZnO composites prepared by melt processing

2018 ◽  
Vol 11 (3) ◽  
pp. 343-352 ◽  
Author(s):  
Alojz Anžlovar ◽  
Andrej Kržan ◽  
Ema Žagar
Keyword(s):  
Melt Processing

Melt-processing of Yb-123 tapes

2000 ◽  
Vol 341-348 ◽  
pp. 2421-2424 ◽  
Author(s):  
S.P. Athur ◽  
U. Balachandran ◽  
K. Salama
Keyword(s):  
Melt Processing

Preparation and melt processing of (RE, Y)BaCuO (RE = Nd, Sm) and (Nd, Sm)BaCuO composites

1998 ◽  
Vol 53 (1-2) ◽  
pp. 95-99 ◽  
Author(s):  
P. Schätzle ◽  
A. Berning ◽  
W. Bieger ◽  
G. Krabbes
Keyword(s):  
Melt Processing

Melt processing for strong flux pinning in RE-Ba-Cu-O (RE: Nd, Sm, Eu, Gd) superconductors

1995 ◽  
Vol 24 (12) ◽  
pp. 1923-1930 ◽  
Author(s):  
S. I. Yoo ◽  
M. Murakami ◽  
N. Sakai ◽  
T. Ohyama ◽  
T. Higuchi ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Melt Processing
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