Effect of Cork Loading on Mechanical and Thermal Properties of Silica-Ethylene-Propylene-Diene Monomer Composite

2012 ◽  
Vol 510-511 ◽  
pp. 277-283 ◽  
Author(s):  
J. Gul ◽  
S. Mirza
Keyword(s):  
Thermal Properties ◽  
Specific Gravity ◽  
Thermal Insulation ◽  
Thermo Gravimetric Analysis ◽  
Space Vehicles ◽  
Mechanical And Thermal Properties ◽  
Gravimetric Analysis ◽  
Ethylene Propylene ◽  
Low Temperature Flexibility ◽  
Lower Temperature

Ethylene-propylene diene ter-monomer (EPDM) filled with asbestos are widely used as thermal insulation in space vehicles because of its low specific gravity, low temperature flexibility, high ozone and oxygen resistant, superior thermal and ablation characteristics. However, asbestos has been banned worldwide because of its carcinogenic nature. This study was aimed to replace asbestos by environmental friendly and low specific gravity filler, cork in thermal insulation for space vehicles. Various batches of cork filled EPDM were obtained by compounding 0, 10, 20, 40, 50, 60, 70 and 100Phr (parts per hundred parts of rubber) of cork powder with EPDM in Two-roll-mill in presence of other necessary compounding ingredients. The resulted vulcanizates were characterized for mechanical, thermal and ablation performances. It was observed that cork loadings significantly enhanced tensile strength and hardness of EPDM. However, elongation at break of EPDM decreased with the increase of cork concentration. Moreover, no significant reduction in density of EPDM was obtained instead of compounding with lower specific gravity cork powder. Temperatures cures in Thermo-gravimetric analysis shifted to lower temperature with increasing of cork percentage in the formulation. Furthermore, char formation of the EPDM composites decreased with the increase of cork Phr in the composition which was the indication of degrading thermal stability of EPDM by cork powders. It can be concluded that on the basis of mechanical properties asbestos can be replaced by cork powder however, cork filled EPDM exhibited inferior thermal properties as compared to asbestos filled EPDM.

Effect of maleic anhydride grafted polylactic acid concentration on mechanical and thermal properties of thermoplasticized starch filled polylactic acid blends

2021 ◽  
pp. 096739112110041
Author(s):  
Shakti Chauhan ◽  
N Raghu ◽  
Anand Raj
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Maleic Anhydride ◽  
Polylactic Acid ◽  
Coupling Agent ◽  
Thermo Gravimetric Analysis ◽  
Mechanical Analysis ◽  
Strength Properties ◽  
Mechanical And Thermal Properties ◽  
Gravimetric Analysis

Polylactic acid (PLA) is blended with native starch or thermo plasticized starch (TPS) for preparing biodegradable composites. However, poor compatibility of PLA with starch results in the composites with inferior mechanical properties. This study examines the effect of Maleic Anhydride-Grafted-PLA (GMAPLA) coupling agent and its concentration on the extent of improvements in mechanical and thermal properties of PLA –TPS blends. Maleic anhydride was grafted on PLA in Haake torque rheometer, characterized and used as the coupling agent. PLA/TPS (wt/wt) blends (70/30 and 50/50) were prepared by twin screw extrusion. GMAPLA at three different levels 5%, 10% and 15% (wt%) with respect to PLA content was taken to study its effect on mechanical properties of blends. Presence of GMAPLA significantly improved the mechanical properties (tensile, flexural and impact strength) of TPS/PLA blends. Among the three concentrations, 10% GMAPLA in the blend was found to give the maximum improvement in strength properties. Dynamic mechanical analysis and thermo-gravimetric analysis indicated no significant effect of GMAPLA content on transition temperatures and thermal degradation behavior of the blends.

scholarly journals Thermal analysis of Kevlar/basalt reinforced hybrid polymer composite

2021 ◽  
Author(s):  
V Ramesh ◽  
P Anand
Keyword(s):  
Thermal Expansion ◽  
Thermal Properties ◽  
Composite Materials ◽  
Hybrid Composite ◽  
Hybrid Composites ◽  
Thermo Gravimetric Analysis ◽  
Linear Thermal Expansion ◽  
Thermal Conductance ◽  
Mechanical And Thermal Properties ◽  
Gravimetric Analysis

Abstract Use of lightweight composite materials in automobile applications such as doors, bonnets, and bumpers and also the utilization of composite materials in building insulations require superior mechanical and thermal properties. This study attempts to determine the thermal conductivity, linear thermal expansion coefficient, heat deflection temperature and thermo gravimetric analysis of hybrid composite containing reinforcement fibers stacked in seven different combinations in an epoxy matrix as per ASTM standards. Each composite contained two different fibre materials, i.e., Kevlar and basalt. The study revealed that the stacked layers of basalt fibers had more influence on the thermal properties. It was observed that the hybrid composite made of least quantity layers of Kevlar and most of basalt exhibited the maximum thermal conductance of 0.219W/mK, while with vice versa laminate developed 0.191W/mK which was least thermal conductance. The composition prepared by made Kevlar as core layer and basalt as its outer layers exhibited coefficient of linear thermal expansion above 11.5x10-6/oC. Maximum decomposition weight loss of 76.92% occurred in the composition prepared by keeping basalt as core and Kevlar as outer layer. The differential thermal graph showed that the said hybrid composite exhibited the peak decomposition rate of 1wt.%/oC. The thermal properties of the laminate prepared by keeping two layers of Kevlar sandwiched between the basalt were excellent when compared to other six hybrid composites investigated in this study.

The influence of adding long basalt fiber on the mechanical and thermal properties of composites based on poly(oxymethylene)

2018 ◽  
Vol 33 (4) ◽  
pp. 435-450 ◽  
Author(s):  
Patrycja Bazan ◽  
Stanisław Kuciel ◽  
Mariola Sądej
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Average Length ◽  
Flexural Modulus ◽  
Basalt Fiber ◽  
Charpy Impact ◽  
Mechanical And Thermal Properties ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Atr Spectroscopy

The work has evaluated the possibility of the potential reinforcing of poly(oxymethylene) (POM) by basalt fibers (BFs) and influence of BFs addition on thermal properties. Two types of composites were produced by injection molding. There were 20 and 40 wt% long BFs content with an average length of 1 mm. The samples were made without using a compatibilizer. In the experimental part, the basic mechanical properties (tensile strength, modulus of elasticity, strain at break, flexural modulus, flexural strength, and deflection at 3.5% strain) of composites based on POM were determined. Tensile properties were also evaluated at three temperatures −20°C, 20°C, and 80°C. The density and Charpy impact of the produced composites were also examined. The influence of water absorption on mechanical properties was investigated. Thermal properties were conducted by the differential scanning calorimetry, thermal gravimetric analysis, and fourier transform infrared (FTIR)-attenuation total reflection (ATR) spectroscopy analysis. In order to make reference to the effects of reinforcement and determine the structure characteristics, scanning electron microscopy images were taken. The addition of 20 and 40 wt% by weight of fibers increases the strength and the stiffness of such composites by more than 30–70% in the range scale of temperature. Manufactured composites show higher thermal and dimensional stability in relation to neat POM.

Low Temperature Die Attach Material

1989 ◽  
Vol 167 ◽  
Author(s):  
Mark A. Blocker ◽  
Tom L. Herrington ◽  
My N. Nguyen
Keyword(s):  
Heat Treatment ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Large Area ◽  
Thermo Gravimetric ◽  
Organic System ◽  
Die Attach ◽  
Volatile Organic ◽  
Lower Temperature ◽  
Sintering Characteristics

AbstractA new silver lead phosphovanadate glass die attach material is discussed. Its sintering characteristics are examined by dilatometry and the organic system by thermo gravimetric analysis. Sintering is found to occur at lower temperature than conventional silver glass systems. This is caused by reaction between silver and one of the glass components during heat treatment. The vehicle is found to evaporate faster allowing void free processing for large area dice.The new glass combined with a more volatile organic system has produced a single pass die attach material which can be fired as low as 360°C.

Study on the thermal stability of Controlled Permeability Formwork

2011 ◽  
Vol 374-377 ◽  
pp. 1426-1429
Author(s):  
Xiao Meng Guo ◽  
Jian Qiang Li ◽  
Xian Sen Zeng ◽  
De Dao Hong
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Dynamic Mechanical Analysis ◽  
Thermo Gravimetric Analysis ◽  
Mechanical Analysis ◽  
Gravimetric Analysis ◽  
Construction Work ◽  
Thermo Gravimetric ◽  
Excellent Thermal Stability ◽  
Thermal Stability Of

In this study, the thermal properties of a kind of new geotextile materials, so called controlled permeable formwork (CPF), were studied. Thermo-gravimetric analysis showed that the weight of CPF didn’t change much between 0~350 °C. Dynamic mechanical analysis showed that the storage modulus of CPF reduced from 25 MPa to around 10 MPa when the temperature rose to above 100 °C. The strength of sample decreased slightly with the increase of the temperature. The breaking elongation changed slightly with a maximum at 80 °C. The CPF showed excellent thermal stability and was suitable for general use in construction work.

PHYSICOCHEMICAL CHANGES OF HYBRID POLYURETHANE INORGANIC THERMAL INSULATION WHEN HEATING IN AIR AND IN AN INERT ATMOSPHERE

2021 ◽  
Vol 4 ◽  
pp. 22-29
Author(s):  
Kobelev A. ◽  
◽  
Naganovsky Yu. ◽  
Kruglov E. ◽  
Aseeva R. ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Fire Hazard ◽  
Thermo Gravimetric Analysis ◽  
Inert Atmosphere ◽  
Atmospheric Environment ◽  
Gravimetric Analysis ◽  
Insulation Material ◽  
Physicochemical Changes ◽  
Fourier Spectrometry ◽  
Hybrid Polyurethane

Purpose. The article presents the results of a study of physicochemical processes occurring when a hybrid polyurethane inorganic thermal insulation is heated under dynamic conditions up to 800 °C in different atmospheric environments. The object of the study was an industrial sample of thermal insulation “FoamTech 1 550” made in South Korea. Methods. In the course of the work thermo-gravimetric analysis and IR-Fourier spectrometry were used. Samples for spectrometric analysis were prepared in the process of thermogravimetric tests by suspending the experiment. Findings. As the result of the combined studying hybrid thermal insulation material by thermogravimetry and IR-Fourier spectrometry methods, the following was established: – polyisocyanate used for obtaining the material is aliphatic in nature; – the hybrid thermal insulation sample contains about 40 % inorganics, presumably aerogel silica; – there are three main stages of hybrid thermal insulation decomposition, both in air and in an inert atmosphere; – analysis of the changes in IR spectra when heating the hybrid sample showed that at the first stage of decomposition, regardless of the atmospheric environment, the condensation reaction of silanol groups of silica aerogel takes place with the water release; – at the second stage, thickening of the inorganic framework continues, chemical polyurethane bonds with the inorganic are destroyed, and polyurethane component carbonization begins. Research application field. The results give the idea of material decomposition process in a fire. Differences in behavior in oxidizing and inert environments are shown. This is important for comparing a new group of materials with the already known types of polymer thermal insulation in terms of their fire hazard and possible application in building construction. Conclusions. The paper studies the chemical structure and physicochemical changes when heating the new group of materials, namely hybrid organic-inorganic thermal insulation materials. The article is a continuation of a team of authors’ systematic study of a thermal behavior of modern types of polymer thermal insulation.

Thermo Oxidative Degradation Behavior of Jatropha Curcass L. Oil in the Presence of Antioxidant

2013 ◽  
Vol 393 ◽  
pp. 893-898
Author(s):  
Abdul Munir Hidayat Syah Lubis ◽  
Bambang Ari-Wahjoedi ◽  
Mustafar Sudin ◽  
Parman Setyamartana
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Oxidative Degradation ◽  
Gravimetric Analysis ◽  
Jatropha Oil ◽  
Base Oil ◽  
Long Time ◽  
First Onset ◽  
Lower Temperature ◽  
Oxidative Behavior ◽  
Thermo Oxidative Degradation

Seed oils were used as base oil since long time ago. However their usage is limited due to its thermo oxidative and cold flow properties. Chemical modification and addition of proper additives are known to be able to improve these limitations. In this work, the effect of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate as potential hindered phenol antioxidant (HPAO) on thermo-oxidative degradation of jatropha oil was investigated. 1, 3, 5 wt% of antioxidant was dissolved into jatropha oil and their thermo-oxidative behavior was studied by using thermo-gravimetric analysis method under oxidative environment. The addition of the HPAO was found to accelerate the occurrence of thermal degradation first onset of jatropha oil. This factor corresponds to reaction of the compound during heating that reduces the peroxides formation to a less-reactive alcohol which is more volatile, thus making the first onset temperature occurred at a lower temperature.

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