Thermal stability of some heat-resistant elastomers

1989 ◽  
Vol 21 (3) ◽  
pp. 199-204 ◽  
Author(s):  
G. J. Knight ◽  
W. W. Wright
Keyword(s):  
Thermal Stability ◽  
Heat Resistant ◽  
Thermal Stability Of

scholarly journals Influence of Alloying on the Thermal Stability of Model Heat Resistant Compositions

2018 ◽  
Vol 374 ◽  
pp. 012006
Author(s):  
A Tyagunov ◽  
E Baryshev ◽  
G Tyagunov ◽  
K Shmakova
Keyword(s):  
Thermal Stability ◽  
Heat Resistant ◽  
Thermal Stability Of

scholarly journals Composite Ferroelectric Coatings Based on a Heat-Resistant Polybenzoxazole Polymer Matrix

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 286
Author(s):  
Nikolay Mukhin ◽  
Irina Sokolova ◽  
Dmitry Chigirev ◽  
Lyudmila Rudaja ◽  
Galina Lebedeva ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Dielectric Constant ◽  
Polymer Matrix ◽  
Composite Coatings ◽  
Polymer Coatings ◽  
Molar Ratio ◽  
Dielectric Parameters ◽  
Temperature Range ◽  
Heat Resistant ◽  
Thermal Stability Of

The polycondensation of 5,5-methylene bis(2-aminophenol) and the mixture of diamines 5,5-methylene bis(2-aminophenol) and 4,4-(hexafluoroisopropylidene)dianiline (molar ratio 0.8:0.2) with isophthaloyl dichloride was used to synthesize a new heat resistant binder of the composites for microelectronics: poly(o-hydroxyamide) (POA) and poly(amido-o-hydroxy amide) (POA-F). The thermal stability of synthesized polymer coatings, as well as based on them photosensitive compositions with a naphthoquinondiazide photosensitive component were studied in the temperature range from 100 to 500 °C. Ferroelectric composites with nanodispersed lead titanate zirconate powder filler were formed based on these polymer matrices. By manipulating the conditions of the polymer formation, we obtained matrices with different stiffnesses, which reflected on the properties of the composite. The electrophysical parameters of the synthesized polymer and ferroelectric composite coatings were measured in the frequency range from 0.1 Hz to 1.5 GHz and the temperature range from 0 to 300 °C. The frequency and temperature stability of the dielectric constant of ferroelectric composite coatings up to 10 MHz and 300 °C, respectively, are noted. The influence of the composition and structure of the polymer matrix and the grain/matrix interfaces on the thermal stability of the dielectric parameters of composite films is estimated. The shift of the phase transition region toward higher temperatures in the composite structure, as well as the sufficient rigidity of the poly(benzoxazole) matrix, provide high temperature and frequency stability of the dielectric constant of the studied composites.

Synthesis and thermal stability of a novel acetylene end-capped silicon-containing polyimide coupling agent with a silane pendant group

2019 ◽  
Vol 31 (9-10) ◽  
pp. 1259-1271 ◽  
Author(s):  
Teng Yang ◽  
Yanhong Hu ◽  
Shifeng Deng ◽  
Lei Du ◽  
Jiali Zhou ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Coupling Agent ◽  
Bending Strength ◽  
Retention Rate ◽  
Resin Matrix ◽  
Silane Coupling Agents ◽  
Residual Rate ◽  
Heat Resistant ◽  
Silane Coupling ◽  
Thermal Stability Of

In this study, a novel heat-resistant polyimide macromolecular coupling agent (PSI-C) was designed and synthesized. Silicon-containing diamine was one of the monomers used to increase the solubility of the polyimide, and m-aminophenylacetylene was the end-capping reagent that copolymerized with the resin matrix. A silane coupling group was introduced into the side chain to match the reinforced fiber. Thermogravimetric analysis revealed that the 5% thermal decomposition temperature ( T d5) of the cured PSI-C could reach 454°C and the residual rate at 800°C was 53%. Thermal pyrolysis of the vaporized resin showed that the heat-resistant functional group was still detectable at 550°C. The thermal stability of the alkynyl-terminated silicon-containing polyimide silane coupling agent was higher than those of conventional silane coupling agents. The curing process of the composite system was not affected when adding the coupling agent PSI-C to the quartz fiber/alkynyl resin composite. The interlaminar shear strength and bending strength of the composite were increased by 55% and 61%, respectively, at room temperature. The high-temperature retention rate at 500°C reached 58% and 63%.

scholarly journals A Study of the Effect of Surface Treatments on the Thermal Stability of Flax Fibres

2000 ◽  
Vol 9 (4) ◽  
pp. 096369350000900 ◽  
Author(s):  
N. E. Zafeiropoulos ◽  
C. A. Baillie ◽  
F. L. Matthews
Keyword(s):  
Thermal Stability ◽  
Surface Treatments ◽  
Polymer Matrices ◽  
Natural Fibres ◽  
Processing Temperature ◽  
Potential Candidate ◽  
Flax Fibres ◽  
Glass Fibres ◽  
Heat Resistant ◽  
Thermal Stability Of

There is an increasing interest in using natural fibres as reinforcing agents in composites. These fibres are considered to be a potential candidate to replace glass fibres in certain applications of composites. They have a number of advantages over glass fibres such as lower cost, lower density, non toxicity, re cycle ability and they are easier to process. However, natural fibres are not heat resistant like glass fibres and therefore they cannot be used with all polymer matrices. Furthermore, natural fibres are hydrophilic materials that do not adhere very well with most polymer matrices that are hydrophobic. Surface treatments are usually employed to improve adhesion in natural fibre composites. Nevertheless, the effect of these treatments upon the thermal stability of natural fibres has not been addressed sufficiently. In this letter seven grades of flax fibres were studied recently to determine their thermal stability profiles for potential use as reinforcements in composite materials. The results indicate that treated flax performs better than untreated flax. Acetylation and stearic acid treatments were found to increase the thermal stability of flax. Duralin flax was found to be sufficiently heat resistant to be usable with thermoplastics such as nylon 6, where the processing temperature is higher than it is for polyolefin matrices.

Preparation and thermal stability of heat-resistant phenolic resin system constructed by multiple heat-resistant compositions containing boron and silicon

2016 ◽  
Vol 29 (4) ◽  
pp. 493-498 ◽  
Author(s):  
Fengyi Wang ◽  
Zhixiong Huang ◽  
Guangwu Zhang ◽  
Yunxia Li
Keyword(s):  
Thermal Stability ◽  
Phenol Formaldehyde ◽  
Interlayer Spacing ◽  
Decomposition Temperature ◽  
Char Yield ◽  
X Ray Diffraction ◽  
Excellent Thermal Stability ◽  
Heat Resistant ◽  
Graphite Structure ◽  
Thermal Stability Of

This work reports a boron- and silicon-containing phenolic-formaldehyde (PF) resin exhibiting an extremely high thermal decomposition temperature and char yield and formed by copolymerizing phenol, formaldehyde, boric acid (BA), and phenyltriethoxysilane (PTES). The structure of BA and PTES-modified PF (BSPF) resin was characterized by Fourier transform infrared spectroscopy. Thermal stability of the investigated composites was estimated by means of thermogravimetric analysis (TGA). The results of TGA indicated that the modified resin exhibited excellent thermal stability. Specifically, the thermoset had a char yield of 77.0% when the boron and silicon contents were only 1.27 wt% and 1.7 wt%, respectively. Compared with the unmodified resin (PF), the temperature at the maximum decomposing rate of the BSPF increased by 84°C and its charring yield was enhanced by 15.0%. The cured products of PF and BSPF were further investigated by X-ray diffraction and Raman spectroscopy, respectively. The incorporation of boron and silicon into the carbon lattice results in a decrease of interlayer spacing, and Raman ID/ IG values for PF and BSPF (2.63 and 1.32) show that the rearrangement of crystalline structure leads to an increase in graphite structure and a decrease in disordered structure upon the modification processes.

Effect of aging temper on the thermal stability of Al–Cu–Mg–Ag heat-resistant alloy

2013 ◽  
Vol 46 ◽  
pp. 360-365 ◽  
Author(s):  
Xiao Yan Liu ◽  
Qing Lin Pan ◽  
Li Yun Zheng ◽  
Quan Rong Fu ◽  
Fei Gao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Heat Resistant Alloy ◽  
Resistant Alloy ◽  
Heat Resistant ◽  
Thermal Stability Of
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