In situ formation of benzoxazines in polyoxymethylene: a simple approach for retarding formaldehyde generation and tuning mechanical properties under a semi-interpenetrating network

RSC Advances ◽  
2016 ◽  
Vol 6 (94) ◽  
pp. 91468-91476 ◽  
Author(s):  
Nantinee Mantaranon ◽  
Masaya Kotaki ◽  
Chwee Teck Lim ◽  
Suwabun Chirachanchai
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Bisphenol A ◽  
Simple Approach ◽  
Interpenetrating Network ◽  
In Situ Formation ◽  
Thermal Stability Of

The thermal stability of polyoxymethylene (POM) significantly increases after blending with bisphenol-A and amine leading to polybenzoxazine formation in POM matrices.

Preparation and Study of PMMA/TiO2 Nanocomposites

2011 ◽  
Vol 233-235 ◽  
pp. 1830-1833 ◽  
Author(s):  
Yong Chen ◽  
Hui Xu ◽  
Tao Sun
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Thermal Stability ◽  
In Situ Polymerization ◽  
The Matrix ◽  
Thermal Stability Of

The PMMA/TiO2 nanocomposites were prepared by in situ polymerization，the dissolution, thermal stability and the mechanical property of the nanocomposites were studied. The results indicated that nano-TiO2 may be crosslinking points in the matrix and the thermal stability of the nanocomposites became higher. As the content of nano-TiO2 increased, the mechanical properties of the nanocomposites had great changes.

Effect of In-Situ Formation of Nanoscale γ-Al2O3 and AlN on Thermal Stability of Cryomilled Nanocrystalline Fe

1995 ◽  
Vol 400 ◽  
Author(s):  
R.J. Perez ◽  
B. Huang ◽  
E.J. Lavernia
Keyword(s):  
Heat Treatment ◽  
Thermal Stability ◽  
Grain Size ◽  
Subsequent Heat Treatment ◽  
Nanometer Scale ◽  
Average Grain Size ◽  
Attritor Milling ◽  
In Situ Formation ◽  
Thermal Stability Of

AbstractCryogenic attritor milling (cryomilling) is used to synthesize nanocrystalline Fe-10wt.%Al powders. Following consolidation in a rigid die at 823 K and heat treatment for 1 hour at 1223 K, an average grain size of 16±7 nm is maintained. This level of thermal stability is shown to exceed that of pure Fe processed under identical conditions. The significant increase in thermal stability is attributed primarily to the presence of nanometer-scale γ-Al2O3 and AIN dispersoids formed during cryomilling and subsequent heat treatment.

Effect of Aging Treatment on the Thermal Stability and Properties of Cu-10Fe-3Ag In Situ Composites

2011 ◽  
Vol 366 ◽  
pp. 343-346 ◽  
Author(s):  
Yong Li ◽  
Rui Qing Liu ◽  
Fang Xu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Aging Temperature ◽  
Aging Treatment ◽  
Ductile Rupture ◽  
In Situ Composite ◽  
Microstructure And Mechanical Properties ◽  
Effects Of Aging ◽  
Thermal Stability Of

The effects of aging treatment on the microstructure and mechanical properties of Cu-10Fe-3Ag in-situ composite were investigated. And the mechanism of Ag element was analyzed during aging treatment. The results show that: presence of Ag can accelerate γ-Fe precipitation from in the Cu matrix, but also reduces the thermal stability of Fe fibers. As the aging temperature increasing, the hardness and conductivity of Cu-10Fe-3Ag in-situ composite increase at first and then decrease. The conductivity of Cu-10Fe-3Ag in-situ composite can reach 58.4% IACS when aging for 6h at 475 °C. The Fractures of the alloy are all ductile rupture and the dimples are smaller with the aging temperature increasing.

Studies on Preparation and Properties of SiO2/PVA-PAMPS Composite Membrane

2012 ◽  
Vol 512-515 ◽  
pp. 2007-2010
Author(s):  
Xiao Xia Chen ◽  
Gui Bao Guo
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Gas Chromatography ◽  
Proton Conductivity ◽  
Sulfonic Acid ◽  
Sol Gel ◽  
Methanol Permeability ◽  
Impedance Analyzer ◽  
Thermal Stability Of

In situ namometer silicon bioxide modification of Poly-2-acrylamido-methyl propane sulfonic acid (PAMPS)-composite-polyvinyl alcohol (PVA) membranes were prepared by sol-gel for DMFC. The mechanical properties and thermal stability of the membranes were measured, at the same time, the influences of the content of the AMPS on the proton conductivity and methanol permeability of the membranes were studied by the impedance analyzer and gas chromatography instrument. The results showed that AMPS is easily blended into PVA modified by SiCl4 and mechanical properties and thermal stability were improved, with increasing of the content of AMPS, the proton conductivity of SiO2/PVA-PAMPS membranes was increased, correspondingly, methanol permeability became large gradually.

scholarly journals Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2903
Author(s):  
Juvenal Giogetti Nemaleu Deutou ◽  
Rodrigue Cyriaque Kaze ◽  
Elie Kamseu ◽  
Vincenzo M. Sglavo
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
High Strength ◽  
Treatment Temperature ◽  
Strength Development ◽  
Particle Sizes ◽  
Cold Setting ◽  
Thermal Stability Of ◽  
Geopolymer Composites ◽  
Refractory Composites

The present project investigated the thermal stability of cold-setting refractory composites under high-temperature cycles. The proposed route dealt with the feasibility of using fillers with different particle sizes and studying their influence on the thermo-mechanical properties of refractory geopolymer composites. The volumetric shrinkage was studied with respect to particle sizes of fillers (80, 200 and 500 µm), treatment temperature (1050–1250 °C) and amount of fillers (70–85 wt.%). The results, combined with thermal analysis, indicated the efficiency of refractory-based kyanite aggregates for enhancing thermo-mechanical properties. At low temperatures, larger amounts of kyanite aggregates promoted mechanical strength development. Flexural strengths of 45, 42 and 40 MPa were obtained for geopolymer samples, respectively, at 1200 °C, made with filler particles sieved at 80, 200 and 500 µm. In addition, a sintering temperature equal to 1200 °C appeared beneficial for the promotion of densification as well as bonding between kyanite aggregates and the matrix, contributing to the reinforcement of the refractory geopolymer composites without any sign of vitrification. From the obtained properties of thermal stability, good densification and high strength, kyanite aggregates are efficient and promising candidates for the production of environmentally friendly, castable refractory composites.

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