Analysis on Aging Characteristics of Composite Insulators

2015 ◽  
Vol 768 ◽  
pp. 406-411
Author(s):  
Song Tao Liu ◽  
Yong Chao Liu ◽  
Li Na Zhu ◽  
Hong Wei Cao ◽  
Chuan Min Chen
Keyword(s):  
Thermal Gravimetric Analysis ◽  
Silicone Rubber ◽  
Internal Surface ◽  
Qualitative Change ◽  
Surface Discharge ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Composite Insulator ◽  
Operating Life

Composite insulator was widely used in the power grid because its excellent performance. Aging issue of composite insulators was appeared with the long-term operating. The internal structure of silicone rubber may be changed with the broken of macromolecular chains of silicone rubber, because long-term operating in the environments of surface discharge, ultraviolet, pollution and other harsh conditions. In order to study the aging characteristics of composite insulator at the different operating life, the components and thermal stability were analyzed using fourier transform infrared spectroscopy (FTIR) and thermal gravimetric analysis (TGA) respectively. The results of FTIR showed that silicon rubber composition in composite insulator changed slightly with different operating life, especially in the internal surface. However, the absorption peaks of Si-CH3 and Si-O-Si on external surface of the insulator were decreased obviously with operating life longer. The thermal gravimetric analysis results showed that the thermostability of composite insulator was almost not changed with different operating life. The temperature of 5% weightlessness was between 320°C to 335°C. It illustrated that the composite insulator had a good thermostability at room temperature and qualitative change wouldn't occur for a long time laying aside. The study of the aging characteristics of composite insulators will provided the reference for performance evaluation of running composite insulators.

Thermal gravimetric analysis of in-situ crosslinked nanocellulose whiskers • poly(methyl vinyl ether-co-maleic acid) • polyethylene glycol

TAPPI Journal ◽  
2011 ◽  
Vol 10 (4) ◽  
pp. 29-33
Author(s):  
LEE A. GOETZ ◽  
AJI P. MATHEW ◽  
KRISTIINA OKSMAN ◽  
ARTHUR J. RAGAUSKAS
Keyword(s):  
Thermal Stability ◽  
Polyethylene Glycol ◽  
Vinyl Ether ◽  
Thermal Gravimetric Analysis ◽  
Maleic Acid ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Methyl Vinyl ◽  
Methyl Vinyl Ether

The thermal stability and decomposition of in-situ crosslinked nanocellulose whiskers – poly(methyl vinyl ether-co-maleic acid) – polyethylene glycol formulations (PMVEMA-PEG), (25%, 50%, and 75% whiskers) – were investigated using thermal gravimetric analysis (TGA) methods. The thermal degradation behavior of the films varied according to the percent cellulose whiskers in each formulation. The presence of cellulose whiskers increased the thermal stability of the PMVEMA-PEG matrix.

Characterization of the electrocatalytic activity of carbon-supported platinum-based catalysts by thermal gravimetric analysis

2015 ◽  
Vol 25 (6) ◽  
pp. 468-469 ◽  
Author(s):  
Igor N. Leontyev ◽  
Daria V. Leontyeva ◽  
Alexandra B. Kuriganova ◽  
Yurii V. Popov ◽  
Olga A. Maslova ◽  
...  
Keyword(s):  
Thermal Gravimetric Analysis ◽  
Electrocatalytic Activity ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Supported Platinum

scholarly journals Synthesis, characterization and photoinduced curing of polysulfones with (meth)acrylate functionalities

2010 ◽  
Vol 6 ◽  
Author(s):  
Cemil Dizman ◽  
Sahin Ates ◽  
Lokman Torun ◽  
Yusuf Yagci
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Thermal Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Condensation Polymerization ◽  
Thermal Gravimetric ◽  
Uv Curable ◽  
H Nmr ◽  
Rate Of Polymerization ◽  
Photo Curing

The UV-curable telechelic polysulfones with (meth)acrylate functionalities were synthesized by condensation polymerization and subsequent esterification. The final polymers and intermediates at various stages were characterized by 1H NMR, FT-ATR, and GPC. The oligomeric films prepared from the appropriate solutions containing these telechelics and 2,2-dimethoxy-2-phenylacetophenone (DMPA) as the photoinitiator undergo rapid polymerization upon irradiation forming insoluble networks. The photo-curing behavior was investigated by photo-DSC and the effects of the molecular weight of the polysulfone precursor and type of functionality on the rate of polymerization and conversion were evaluated. Thermal properties of the photochemically cured films were studied by differential scanning calorimeter (DSC) and thermal gravimetric analysis (TGA).

The Influence of Humidity on the Structure of MoS2(PEO)1.3 Nanocomposites

2000 ◽  
Vol 661 ◽  
Author(s):  
Philippe Westreich ◽  
Datong Yang ◽  
Robert F. Frindt
Keyword(s):  
Molecular Weight ◽  
Relative Humidity ◽  
Ethylene Oxide ◽  
Thermal Gravimetric Analysis ◽  
Basal Plane ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray ◽  
Atmospheric Relative Humidity ◽  
Coherence Lengths

ABSTRACTLayered nanocomposites of molybdenum disul.de (MoS2) andp oly (ethylene oxide) (PEO) were studied using x-ray di.raction of powder and oriented thin.lm samples. Thermal gravimetric analysis provided information on the composition of the material. The e.ects of the molecular weight of PEO andthe atmospheric relative humidity on the structure were also investigated. A basal plane spacing of 14.3 °, corresponding to an expansion of 8.1 ° between MoS2 layers, was foundfor dry samples, in agreement with the literature. At about 30% humidity, the expansion increases to 10.6°. This increase corresponds approximately to the thickness of one monolayer of water. The spacing is constant until around80% humidity, when the expansion begins to increase again, reaching up to 25 ° near 100% humidity. X-ray coherence lengths in the direction perpendicular to the planes averaged13, 7 and 2 MoS2 layers for the dry, 58% humid and nearly 100% humid samples, respectively.

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