scholarly journals Preparation of Room Temperature Vulcanized Silicone Rubber Foam with Excellent Flame Retardancy

Scanning ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Weiqi Luo ◽  
Zhimin Li ◽  
Haihua Luo ◽  
Yuting Liu ◽  
Guojiang Xia ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Composite Materials ◽  
Silicone Rubber ◽  
Chemical Structure ◽  
Room Temperature ◽  
Cell Structure ◽  
Fire Retardant ◽  
Excellent Performance ◽  
Wide Range ◽  
Sealing Materials

To retard the spread of fire in many cases with sealing materials is significant. A series of silicone rubber foam materials were prepared with room temperature vulcanization and foaming reactions. The morphology, chemical structure, cell structure, and thermal stability were investigated and results proved that the synthesis of silicone rubber was successful in a wide range of feed ratios. The fire-retardant tests were carried out to study the fire-proof property of the composite materials, and the excellent performance showed a promising prospect for wide application in sealing materials.

Synthesis and properties of phthalonitrile-based resins containing spirocycle acetal

2020 ◽  
pp. 095400832097759
Author(s):  
Ke Li ◽  
Hua Yin ◽  
Kun Yang ◽  
Pei Dai ◽  
Ling Han ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Chemical Structure ◽  
Room Temperature ◽  
Laser Desorption Ionization ◽  
Scanning Calorimetry ◽  
Rheological Analysis ◽  
Ionization Time ◽  
Dynamic Mechanical ◽  
Nmr Spectrometry ◽  
Current Context

Designing novel low-melting, high-rigidity phthalonitrile resin is of great significance in the current context of development. In this study, rigid spirocycle acetal structure was introduced into phthalonitrile to reduce the melting point and maintain their thermal stability. The chemical structure of resins was confirmed by nuclear magnetic resonance (NMR) spectrometry, matrix-assisted laser desorption/ionization time of flight (MALDI-TOF) mass spectrometry and Fourier-transform infrared (FTIR) spectroscopy. The curing behaviors were studied by differential scanning calorimetry (DSC). Thermal stability and mechanical properties of the cured resins were investigated by dynamic mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA). The processability was studied by rheological analysis. The results indicated the three monomers had a low melting temperature, wide processing windows and low viscosities. These polymers did not exhibit Tg from room temperature to 400°C, exhibited superb dynamic mechanical property and thermal stability.

scholarly journals Thermal characterization of novel aliphatic polyesters with ether and thioether linkages

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Soccio ◽  
N. Lotti ◽  
L. Finelli ◽  
A. Munari
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Chemical Structure ◽  
Room Temperature ◽  
Crystallization Rate ◽  
Thermal Characterization ◽  
Scanning Calorimetry ◽  
Aliphatic Polyesters ◽  
Good Thermal Stability

AbstractSeveral novel ether or thioether linkage containing aliphatic polyesters and poly(alkylene dicarboxylate)s were synthesized for comparison and characterized in terms of chemical structure and molecular weight. The thermal behavior was examined by thermogravimetric analysis and differential scanning calorimetry. All the polymers showed a good thermal stability, even though lower for the ether or thioether linkage-containing polyesters. The decrement of the thermal stability appears to be more relevant in the case of the presence of sulphur atoms. At room temperature the samples appeared semicrystalline, except PTTDG and PDEDG, which were viscous oils; the effect of the introduction of ether or thioether group was an increment of the Tgvalue, a decrement of the melting temperature and a significant decrease of the crystallization rate. The entity of the variations was found to be affected by the kind of group introduced, and the trend observed can be explained on the basis of atom electronegativity and dimensions

Experimental determination of thermal conductivity of composite materials in a wide range of values at room temperature

2019 ◽  
Author(s):  
A.N. Chistov ◽  
M.Yu. Kladov ◽  
I.B. Pronin ◽  
A.S. Smirnov
Keyword(s):  
Thermal Conductivity ◽  
Composite Materials ◽  
Room Temperature ◽  
Measurement Procedure ◽  
Thermal Mode ◽  
Wide Range ◽  
Measurement Results ◽  
Transfer Problems ◽  
Range Of Values

In developing new composite materials and solving heat transfer problems, the thermal conductivity is an important characteristic that must be reliably determined. This often requires samples of the smallest dimensions, which is relevant for the production of pilot batches of material, as well as if they are taken directly from the product, when the amount of material is very limited. Most common methods for determining thermal conductivity require samples of relatively large sizes. To measure thermal conductivity on small-sized samples, an upgraded benchtop instrument is introduced. The instrument uses the relative method of longitudinal heat flux, which consists in a comparative measurement of a sample located between the heater and the standard in a stationary thermal mode. This paper presents the instrument design details, the requirements for the samples, explains the calibration features and the measurement procedure. The measurement results in a number of composite materials, as well as in materials with well-studied properties are analyzed. Findings show that the error of determining the thermal conductivity on a modernized instrument does not exceed several percent.

scholarly journals THERMAL CONDUCTIVITY OF COMPOSITIONS BASED ON A SILOXANE BINDER WITH A HIGH FILLER CONTENT OF ALUMINUM HYDROXIDE POWDER

2018 ◽  
pp. 39-43
Author(s):  
V. Sh. Sulaberidze ◽  
V. D. Mushenko ◽  
V. A. Mikheev
Keyword(s):  
Thermal Conductivity ◽  
Composite Materials ◽  
Aluminum Hydroxide ◽  
Volume Content ◽  
Room Temperature ◽  
Filler Content ◽  
Heat Conducting ◽  
Temperature Range ◽  
Wide Range ◽  
Volumetric Content

The use of aluminum hydroxide as a filler in composite materials makes them non-flammable. When the thermal conductivity of such compositions is above 1 W/(m-K), they can be used as heat-conducting insulating and non-flammable coatings in power electronics. Thermal conductivity of compositions based on dimethylsiloxane with a filler made from aluminum hydroxide powders of various dissipation is studied in the temperature range from 25 °C to 200 °C, depending on the volume content of the filler. With a volumetric content of filler up to 60%, no significant differences in the values of the thermal conductivity of samples with powders of the investigated fractional groups were detected. With volumetric content of the filler more than 40%, the thermal conductivity of the composition at room temperature exceeded 1 W/(m-K). It is shown that the Burger formula modified by the authors turned out to be sufficiently universal for the calculated estimates of the thermal conductivity of materials with different fillers in a wide range of their volume contents.

Study on Short Basalt Fiber Reinforced Silicone Rubber Composites

2013 ◽  
Vol 800 ◽  
pp. 383-386 ◽  
Author(s):  
Wei Li Wu ◽  
Jin Yue Cai
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Silicone Rubber ◽  
Basalt Fiber ◽  
Rubber Composites ◽  
Excellent Performance ◽  
Elongation At Break ◽  
Rubber Composite ◽  
Insulating Properties ◽  
Ozone Resistance

Silicone rubber has excellent performance, such as cold resistance, heat resistance, ozone resistance, thermal properties and insulating properties and so on. However, silicone rubber is in the state of semi-liquids and it is very soft, so the mechanical properties of silicone rubber are very poor. In order to improve its availability of silicone rubber, short basalt fiber / silicone rubber composite materials were prepared by using short basalt fiber as reinforcement, and its mechanical properties and compatibility were studied. The best formulation of short basalt fiber / silicone rubber composite materials were determined by testing Shore A hardness, tensile strength and elongation at break, and the morphology structure and compatibility of short basalt fiber / silicone rubber composite materials were discussed by scanning electron microscope and infrared spectrum, prepare excellent performance of silicone rubber composite materials.

scholarly journals A novel crosslinking agent of polymethyl(ketoxime)siloxane for room temperature vulcanized silicone rubbers: synthesis, properties and thermal stability

RSC Advances ◽  
2018 ◽  
Vol 8 (23) ◽  
pp. 12517-12525 ◽  
Author(s):  
Xibing Zhan ◽  
Xiqing Cai ◽  
Junying Zhang
Keyword(s):  
Thermal Stability ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Crosslinking Agent ◽  
Synthesis Properties ◽  
Cross Linker ◽  
Silicone Rubbers ◽  
Rtv Silicone Rubber

A novel cross-linker polymethyl(ketoxime)siloxane was synthesized and then was cured with hydroxyl-terminated polydimethylsiloxane matrix to fabricate a series of novel RTV silicone rubber. Their properties was comparatively investigated.

Effect of Dopants on Microstructure and Properties of Polyaniline and Polypyrrole

2011 ◽  
Vol 328-330 ◽  
pp. 1576-1579
Author(s):  
Lei Yang ◽  
Chang Sen Zhang
Keyword(s):  
Thermal Stability ◽  
Room Temperature ◽  
Volume Resistivity ◽  
Chemical Oxidation ◽  
Wide Range ◽  
Chemical Oxidation Polymerization ◽  
Resistivity Minimum ◽  
Conductive Properties ◽  
Thermal Stability Of ◽  
Better Than

Polyaniline (PANI) and polypyrrole (PPy) doping with hydrochloric acid (HCl), p-toluenesulfonate (pTSA) were successfully synthesized by chemical oxidation polymerization. Ammonium peroxydisulfate was used as an oxidizing agent at room temperature. Microstructure of PPy and PANI was studied by scanning electron microscopy (SEM). Discussed the acid concentration how influenced on the electrical conductivity properties of PANI and PPy, and also compared their resistivity and thermal stability. The results showed that HCl effectively improved conductive properties of PANI in a wide range concentrations, and pTSA in narrow range concentrations. When doping with HCl, the minimum volume resistivity of PANI was 0.24 Ω • cm, and PPy was about 10.5 Ω • cm. When doping with pTSA, the volume resistivity minimum of PANI was 1.3 Ω • cm, and PPy was 15.8 Ω • cm. The conductivity of PPy was weaker than PANI. The thermal stability of conducting polymers which doping with pTSA was better than which doping with HCl.

Thermal characterization of novel aliphatic polyesters with ether and thioether linkages

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Soccio ◽  
N. Lotti ◽  
L. Finelli ◽  
A. Munari
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Chemical Structure ◽  
Room Temperature ◽  
Crystallization Rate ◽  
Thermal Characterization ◽  
Scanning Calorimetry ◽  
Aliphatic Polyesters ◽  
Good Thermal Stability

AbstractSeveral novel ether or thioether linkage containing aliphatic polyesters and poly(alkylene dicarboxylate)s for comparison were synthesized and characterized in terms of chemical structure and molecular weight. The thermal behavior was examined by thermogravimetric analysis and differential scanning calorimetry. All the polymers showed a good thermal stability, even though lower for the ether or thioether linkage-containing polyesters. The decrement of the thermal stability appears to be more relevant in the case of presence of sulphur atoms. At room temperature the samples appeared semicrystalline, except PTTDG and PDEDG, which were viscous oils; the effect of the introduction of ether or thioether group was an increment of the Tg value, a decrement of the melting temperature and a significant decrease of the crystallization rate. The entity of the variations was found to be affected by the kind of group introduced, and the trend observed can be explained on the basis of atom electronegativity and dimensions.

scholarly journals RHEOLOGICAL PROPERTIES AND THERMAL STABILITY OF CAST COMPOSITIONS BASED ON POLYPHENYLENESULPHIDES

2017 ◽  
Vol 12 (2) ◽  
pp. 100-104
Author(s):  
A. B. Baranov ◽  
I. N. Tsapenko ◽  
A. V. Petrogradsky ◽  
I. D. Simonov-Emelyanov ◽  
N. L. Shembel
Keyword(s):  
Thermal Stability ◽  
Composite Materials ◽  
Rheological Properties ◽  
Temperature Interval ◽  
Wide Temperature Range ◽  
Temperature Range ◽  
Wide Range ◽  
Filled Composite ◽  
Thermal Stability Of

The rheological properties of polysulfide (PPS) melts and composite materials based on them were investigated in a wide range of temperatures and concentrations of fillers of different nature. It was established that the introduction of rheological additives into dispersed and hybrid-filled composite materials allows significantly reducing the viscosity and improving the processability of the compositions. Introduction of heat-stabilizing additives into PPS allows expanding the temperature interval of processing the composite materials based on PFC from 320 to 340°С. Complete thermal stability curves for the PPS compositions in a wide temperature range were obtained.

Study on Preparation and Properties of APP Filled Flame Retardant Silicone Rubber Composites

2014 ◽  
Vol 1082 ◽  
pp. 379-382 ◽  
Author(s):  
Yu Qi Liu ◽  
Jin Cheng Wang
Keyword(s):  
Thermal Stability ◽  
Flame Retardant ◽  
Tensile Properties ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Flame Retardance ◽  
Rubber Composites ◽  
Thermal Stability Of

A flame-retardant room-temperature vulcanizated silicone rubber (RTV) was prepared with the addition of APP. The effect of different amount of APP on flame retardance, tensile properties, and thermal stability of RTV were studied.Results showed that RTV/APP composites possessed better flame-retardant behaviour, better initial thermal stability, but worse tensile properties.

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