scholarly journals PREPARATION OF CASTOR-BASED POLYURETHANE COMPOSITES FILLED WITH WASTE CARBON TYRES (WCT) AS GROUTING MATERIAL

2020 ◽  
Vol 82 (5) ◽  
Author(s):  
Nur Izzah Atirah Mat Hussain ◽  
Noor Najmi Bonnia ◽  
Radin Siti Fazlina Nazrah Hirzin ◽  
Ernie Suzana Ali ◽  
Suzana Ratim
Keyword(s):  
Thermal Stability ◽  
Particle Size ◽  
Reaction Time ◽  
Compression Strength ◽  
Foam Cell ◽  
Polyurethane Composite ◽  
Grouting Material ◽  
Polyurethane Composites ◽  
Uniform Particle Size ◽  
Thermal Stability Of

This research focused on the fabrication of castor-based polyurethane composite (CPUC) filled with waste carbon tyres (WCT) with particle size of 200 µm that acts as reinforcing filler. WCT was first sieved using a sieving machine to obtain uniform particle size. WCT loading was varied at 0wt%, 2wt%, 4wt% and 6wt%. The effect of WCT loading in CPUC was evaluated based on their foam reaction time, apparent density, rheology, compression strength, morphology and thermal properties. The foam reaction time of CPUC achieved was in the range of industrial PU grout’s properties. The rheology index and compression strength of CPUC decreased with increasing WCT loading. CPUC with 2wt% of WCT loading achieved the optimum compression strength where it increased from 2.58 MPa to 3.39 MPa with the improvement of 31.40% compared to neat PU. FESEM micrograph showed that CPUC consists of closed foam cell indicating the rigidity of the CPUC. The addition of 2wt% of WCT resulted in achieving the optimum thermal stability of CPUC where CPUC2 had the highest char residue content. The high residue content indicated that CPUC2 had the lowest decomposition of elements as WCT acted as heat barrier in CPUC matrix thus increasing the thermal stability of CPUC2.

Novel Thermally Stable Epoxy-polyurethane Composites: Preparation, Characterization

2011 ◽  
Vol 239-242 ◽  
pp. 2742-2747
Author(s):  
Jing Lin ◽  
Qiu Zhuan Yang ◽  
Xiu Fang Wen ◽  
Zhi Qi Cai ◽  
Pi Hui Pi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ring Opening ◽  
Thermal Characteristics ◽  
Ring Opening Reaction ◽  
Tetramethylammonium Bromide ◽  
One Step ◽  
Novolac Epoxy ◽  
Polyurethane Composites ◽  
Novolac Epoxy Resins ◽  
Thermal Stability Of

A novel series of hydroxyl terminated bisphenol-A type novolac epoxy resins modified with propionic acid (MEP) were prepared by one-step ring-opening reaction process in the presence of tetramethylammonium bromide catalyst. The obtained MEP was characterized using FTIR,1HNMR analyses. In addition, Intercross-linked epoxy-polyurethane composites networks were also obtained by curing reaction among MEP, cross linker polyisocyanate IL1351 and phthalic anhydride. The thermal characteristics of the epoxy-polyurethane composites were determined by thermogravimetric analysis (TGA). The thermal stability of the cured MEP with different ring-opening rate and cured alkyd polyol A450 were compared. The results showed that the obtained epoxy-polyurethane composites had much better thermal stability than the conventional polyurethane system A450/IL1351, and the thermal stability of them was correlated to the content of MEP.

scholarly journals Facile Method to Tune the Particle Size and Thermal Stability of Magnetite Nanoparticles

2015 ◽  
Author(s):  
Loushambam H. Singh ◽  
Sudhanshu S. Pati ◽  
Maria J. A. Sales ◽  
Edi M. Guimarães ◽  
Aderbal C. Oliveira ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Particle Size ◽  
Magnetite Nanoparticles ◽  
Thermal Stability Of

scholarly journals Green Flexible Polyurethane Foam as a Potent Support for Fe-Si Adsorbent

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2011 ◽  
Author(s):  
Afiqah Ahmad ◽  
Siti Nurul Ain Md. Jamil ◽  
Thomas Shean Yaw Choong ◽  
Abdul Halim Abdullah ◽  
Mohd Sufri Mastuli ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Polyurethane Foam ◽  
Palm Oil ◽  
Morphological Analysis ◽  
Physical Interaction ◽  
Drying Method ◽  
Polyurethane Composite ◽  
Flexible Polyurethane Foam ◽  
Flexible Polyurethane ◽  
Thermal Stability Of

This paper describes the preparation, characterisation, and potential application of flexible palm oil-based polyurethane foam (PUF) as a support for iron-silica (Fe-Si) adsorbent. Fe-Si/polyurethane composite (Fe-Si/PUC) was prepared by impregnating Fe-Si adsorbent onto the surface of PUF by using a novel immersion-drying method. Morphological analysis of Fe-Si/PUC proved that Fe-Si was successfully impregnated onto the surface of PUF. Compression test and thermogravimetric analysis were carried out to determine the flexibility and thermal stability of Fe-Si/PUC, respectively. The Fe-Si/PUC removed 90.0% of 10 ppm methylene blue (MB) from aqueous solution in 60 min. The reusability study showed that Fe-Si/PUC removed 55.9% of MB on the seventh cycle. Hence, the synthesis of Fe-Si/PUC opens up a new path of implementing palm oil-based PUF to assist in the recovery of an adsorbent for environmental clean-up. The mechanism of physical interaction during the impregnation of Fe-Si adsorbent onto PUF was proposed in this paper.

Thermal stability of nanocrystalline WC–Co powder synthesized by using mechanical milling at low temperature

2001 ◽  
Vol 16 (2) ◽  
pp. 478-488 ◽  
Author(s):  
Jianhong He ◽  
Leoanardo Ajdelsztajn ◽  
Enrique J. Lavernia
Keyword(s):  
Thermal Stability ◽  
Particle Size ◽  
Mechanical Milling ◽  
Gradual Increase ◽  
Thermal Exposure ◽  
X Ray Diffraction ◽  
Cryomilled Powder ◽  
X Ray ◽  
Increasing Temperature ◽  
Thermal Stability Of

Nanostructured WC–18% Co powder was synthesized by using cryogenic mechanical milling, and the thermal stability of the nanostructured powder was investigated in detail. The results indicated that the as-synthesized WC–18% Co powder had an average WC particle size of 25 nm. Growth of WC particles occurred above 873 K; however, the average WC particle size remained smaller than 100 nm in the powder isothermally heated for 4 h at 1273 K. Thermal exposure in air at T < 623 K did not result in significant oxidation of the cryomilled powder. The thermal exposure did promote the formation of WO2 and WO3 oxides. The Co6W6C phase was detected by x-ray diffraction in the powder heated in nitrogen at 1273 K, and the phases associated with decarburization of WC, such as W2C, W3C phases, were not observed. With increasing temperature, the dissolution of W and C elements in the Co matrix led to a gradual increase in {111} crystallographic plane spacing, eventually leading to the formation of an amorphous phase.

ROLE OF MOLYBDENUM TRIOXIDE ON THERMAL STABILITY OF POLYANILINE NANOCOMPOSITE

2012 ◽  
Vol 11 (03) ◽  
pp. 1250025
Author(s):  
P. SUJA PREMA RAJINI ◽  
R. MURUGESAN ◽  
S. PERUMAL
Keyword(s):  
Thermal Stability ◽  
Weight Loss ◽  
Particle Size ◽  
Metal Oxide ◽  
Molybdenum Trioxide ◽  
Spectral Studies ◽  
Average Particle ◽  
Weight Loss Step ◽  
The Third ◽  
Thermal Stability Of

Molybdenum trioxide (MoO3) grains were coated with conducting organic polymer of polyaniline. The as-prepared nanocomposite samples were characterized by Fourier transformed infrared (FTIR) spectra, X-ray diffraction (XRD) and Thermogravimetry (TGA). The XRD curves shows that, [Formula: see text] have high crystallinity due to the presence of large number of sharp peaks. From the XRD pattern the particle size is evaluated by using Debye-Scherrer's formula and the average particle size of [Formula: see text] and [Formula: see text] nanocomposites are found to be 46 and 32 nm, respectively. This is clearly observed that the condensed particle size of nanocomposite materials is due to the insertion of metal oxide of molybdenum. The incorporation of metal oxide of MoO3 in polyaniline (Pani) is confirmed by FTIR spectral studies. After de-doping, the characteristic peaks of Pani for all the Pani materials are almost same. This is due to the leaching of metal oxide of MoO3 from Pani. From these observations it is noted that doping–dedoping can also take place in inorganic metal oxides. The thermogram showed a three-step degradation process. The first weight loss step was due to the removal of physisorbed water molecules and moisture. The second minor weight loss step was associated with the removal of dopant from Pani backbone and the slight degradation of benzenoid structure of Pani and their thermal stability is enhanced. The third weight loss step was ascribed to the degradation of quinoid form of Pani. This confirmed the thermal stability of [Formula: see text] nanocomposite system. After degradation above 1000°C, the Pani with MoO3 showed a remaining weight of 8%. This confirmed that incorporation of metal oxide in the Pani nanocomposites is 8%. The enhancement of thermal stability is due to the intercalation of Pani chains into MoO3 in first two step degradation, which is further supported by FTIR and XRD reports. The third step degradation of Pani with MoO3 nanocomposite is loosely bound in organic and inorganic part. Therefore, the organic part is easily decomposed.

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