scholarly journals Thermal and anticorrosion properties of polyurethane coatings derived from recycled polyethylene terephthalate and palm olein-based polyols

2021 ◽  
Vol 8 (4) ◽  
Author(s):  
Abbas Ahmad Adamu ◽  
Norazilawati Muhamad Sarih ◽  
Seng Neon Gan
Keyword(s):  
Thermal Stability ◽  
Polyethylene Terephthalate ◽  
Palm Olein ◽  
Mixed Solvent ◽  
Acid Value ◽  
Xrd Analysis ◽  
Dibutyltin Dilaurate ◽  
Recycled Pet ◽  
Good Thermal Stability ◽  
Anticorrosion Properties

Polyols of palm olein/polyethylene terephthalate (PET) were synthesized by means of incorporating recycled PET from waste drinking bottles in different proportions into palm olein alkyd in the presence of ethylene glycol. The polyols were characterized by FTIR, and theirs hydroxyl value (OHV), acid value (AV) and viscosity were determined. The formulation of the polyurethane coating was carried out by dissolving the polyol in mixed solvent of cyclohexanone/tetrahydrofuran (THF) (4 : 1) followed by reacting 1 hydroxyl equivalent of the polyol with 1.2 equivalents of methylene diphenyldiisocyanate and 0.05% dibutyltin dilaurate (DBTDL) catalyst. The coating cured through the cross-linking reactions between hydroxyl and isocyanate groups. The formation of urethane linkages was established by FTIR spectroscopy. The set films were characterized by thermal analysis. To study their anticorrosion properties, polarization measurements and EIS in 3.5% NaCl solution were determined. The coatings displayed good thermal stability and anticorrosion properties which were supported by XRD analysis. The PU7 coating, with the highest proportion of PET (up to 15% w/w), displayed significantly improved thermal stability and anticorrosion properties. It is evident that the performance of the polyurethane (PU) coatings could be enhanced by the incorporation of PET.

scholarly journals Enhanced Corrosion Protection of Iron by Poly(3-hexylthiophene)/Poly(styrene-co-hydroxystyrene) Blends

Coatings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 383 ◽  
Author(s):  
Ming-Chia Tsai ◽  
Chung-Ru Yang ◽  
Jen-Hao Tsai ◽  
Yuan-Hsiang Yu ◽  
Ping-Tsung Huang
Keyword(s):  
Thermal Stability ◽  
Thermal Treatment ◽  
Adhesion Force ◽  
Hydroxyl Group ◽  
Adhesion Test ◽  
Adhesion Promoter ◽  
Protection Efficiency ◽  
Good Thermal Stability ◽  
Corrosion Of Iron ◽  
Anticorrosion Properties

Corrosion of iron in NaCl solution is significantly reduced by poly(3-hexylthiophene) (P3HT)/poly(styrene-co-hydroxystyrene)(PS-co-PHS) blended coating layers, especially at elevated temperature. The interaction between sulfur (in P3HT) and hydroxyl group (in PS-co-PHS) leads to enhanced miscibility between P3HT and PS-co-PHS and results in improved thermal stability upon thermal treatment. Adhesion force between iron and the coating layer is increased with increasing hydroxystyrene ratio as revealing by the adhesion test (ASTM 3359). Anticorrosion properties from electrochemical experiments indicate great improvement over the P3HT/PS blend. Protection efficiency (PE) of P3HT/PS-co-PHS blend on iron increases and corrosion rate (mils per year, MPY) decreases upon thermal treatment, making P3HT/PS-co-PHS blend an excellent corrosion inhibitor and adhesion promoter material to the iron, especially with good thermal stability.

Microstructure and properties of Ni–Co–TiO2 composite coatings fabricated by electroplating

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540008 ◽  
Author(s):  
Yuxin Wang ◽  
Xin Shu ◽  
Wei Gao ◽  
R. A. Shakoor ◽  
Ramazan Kahraman ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Thermal Stability ◽  
Magnetic Properties ◽  
Composite Coatings ◽  
Wear Property ◽  
Tribological Behaviour ◽  
Good Thermal Stability ◽  
Microstructure And Properties ◽  
Anticorrosion Properties

Ni – Co coatings are widely used due to their unique mechanical properties, high anticorrosion properties, good thermal stability and special magnetic properties. Ni – Co – xTiO 2 ( x = 0–20 g/L in the electrolyte) composite coatings were fabricated by electrodeposition on mild steel. The effect of TiO 2 concentration on the microhardness, surface morphology and tribological behaviour has been studied. The results show that, comparing with pure Ni – Co coating, both microhardness and wear property of the Ni – Co – TiO 2 composite coatings were significantly improved. The microstructure and properties for the Ni – Co – TiO 2 composite coatings were varied following with the TiO 2 concentration. The mechanism of mechanical property improvement was also discussed.

Molecular design and synthesis of thermotropic liquid crystalline poly(amide imide)s with high thermal stability and solubility

e-Polymers ◽  
2017 ◽  
Vol 17 (2) ◽  
pp. 199-207 ◽  
Author(s):  
Yanbin Wang ◽  
Guangming Lu ◽  
Wenjie Wang ◽  
Meng Cao ◽  
Zhonglin Luo ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Liquid Crystalline ◽  
Molecular Design ◽  
Xrd Analysis ◽  
Proton Nuclear Magnetic Resonance ◽  
Scanning Calorimetry ◽  
Good Thermal Stability ◽  
Design And Synthesis ◽  
H Nmr ◽  
Melting Temperatures

AbstractA series of thermotropic liquid crystalline poly(amide imide)s (PAIs) with well-defined structure were prepared by the Yamazaki-Higashi phosphorylation method. To obtain the target polymers, several diimide diacid monomers (DIDAs) as mesogenic units were synthesized by the dehydration cyclization of aromatic anhydride with aliphatic 11-aminoundecanoic acid (AU). The chemical structure of these DIDAs and PAIs was confirmed via Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1H-NMR) spectroscopy. Thermotropic liquid crystalline characteristics of the DIDAs and PAIs were investigated by differential scanning calorimetry (DSC), polarizing light microscopy (PLM) and X-ray diffraction (XRD) analysis. Encouragingly, all of these liquid crystalline PAIs exhibited good thermal stability, in which the decomposition temperatures are much higher than the melting temperatures of PAIs. Furthermore, the liquid crystalline PAIs can be dissolved into some common solvents such as dimethyl sulfoxide (DMSO) and m-cresol, which indicates these liquid crystalline PAIs could be processed not only by melting-processing but also by solution spin-coating.

Optimization of Organic Fibres%[Kevlar/Arobocel/Acrylic] in NAO Brake Pad Application and its Effect on Thermal Stability & Friction Characteristics

2012 ◽  
Vol 531-532 ◽  
pp. 8-12
Author(s):  
M.A. Sai Balaji ◽  
K. Kalaichelvan
Keyword(s):  
Thermal Stability ◽  
Weight Loss ◽  
Minimum Weight ◽  
Friction Material ◽  
Brake Pad ◽  
Temperature Zone ◽  
Good Thermal Stability ◽  
Friction Testing ◽  
Brake Application ◽  
The Stability

Organic fibres (Kevlar/ Arbocel / Acrylic) have good thermal stability, higher surface area and bulk density. The optimization of organic fibres percentage for thermal behaviour is considered using TGA. The temperature raise during brake application will be between 150-4000 C and this temperature zone is very critical to determine the fade characteristics during friction testing. Hence, three different friction composites are developed with the same formulation varying only the Kevlar, Arbocel and Acrylic fibres which are compensated by the inert filler namely the barites and are designated as NA01, NA02 and NA03 respectively. After the fabrication, the TGA test reveals that the composite NA03 has minimum weight loss. The friction coefficient test rig is then used to test the friction material as per SAE J661a standards. The results prove that the brake pad with minimum weight loss during TGA has higher friction stability. Thus, we can correlate the thermal stability with the stability of friction.

scholarly journals Mechanical and structural properties of composites made from recycled and virgin polyethylene terephthalate (PET) and metal chip or mesh wire

2019 ◽  
Vol 299 ◽  
pp. 06007
Author(s):  
Mircea Aurelian Antoniu Rusu ◽  
Sever-Adrian Radu ◽  
Catalin Moldovan ◽  
Codruta Sarosi ◽  
Ionela Amalia Mazilu (Moldovan) ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyethylene Terephthalate ◽  
Processing Parameters ◽  
Sem Images ◽  
Major Drawback ◽  
Recycled Pet ◽  
Plastic Processing ◽  
Metal Chip ◽  
Intense Research ◽  
Properties Of Composites

Although polyethylene terephthalate (PET) is a champion of recycling, intense research is being done to find new solutions for using recycled plastic. This study aims to characterize the mechanical andstructural properties (SEM- scanning electron microscopy) of products made from recycled metal swarf or mesh wire with recycled plastic (PET) in comparison with virgin plastic. Samples manufactured from virgin and recycled PET are made by pressing and high temperature. The loss of mechanical properties ofproducts made from recycled plastic is a major drawback that influences their use. SEM images confirm that the dispersion and distribution of the PET phase is not very uniform. By addition of virgin plastic in various compositions with recycled plastic, processing parameters and mechanical properties can be optimized.

Preparing and Applying of Flame Retardant Microcapsules Containing Magnesium Hydroxide

2013 ◽  
Vol 734-737 ◽  
pp. 2191-2194
Author(s):  
Li Li Wu ◽  
Yuan Lian ◽  
Dan Liu ◽  
Hua Zheng ◽  
Dian Wu Huang
Keyword(s):  
Thermal Stability ◽  
Flame Retardant ◽  
Magnesium Hydroxide ◽  
Low Density Polyethylene ◽  
Core Shell ◽  
Low Density ◽  
Melamine Resin ◽  
Shell Material ◽  
Elongation At Break ◽  
Good Thermal Stability

In this study, flame retardant microcapsules were synthesized using magnesium hydroxide as core materials, melamine resin as the shell material. The structure, diameters and thermal properties of prepared microcapsules were investigated by using FTIR, ELS, DSC and TGA. The effects of core/shell ratio on the properties of microcapsules were studied.Flame retardant materials of low-density polyethylene/magnesium hydroxide microcapsules were prepared.The tensile strength and elongation at break tests were performed to determine its mechanical property.Inflammability of the materials was also studied.The results showed the prepared magnesium hydroxide microcapsule shows good thermal stability and it has free compatibility with the polymer.The composites of HDPE/MH microcapsules have good performance．

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