Insulation Materials for Wire and Cable Applications

2002 ◽  
Vol 75 (4) ◽  
pp. 701-712 ◽  
Author(s):  
J. L. Mead ◽  
Z. Tao ◽  
H. S. Liu
Keyword(s):  
Material Selection ◽  
Polymeric Materials ◽  
Dielectric Strength ◽  
Thermoplastic Elastomers ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Flame Resistance ◽  
Wide Range ◽  
Materials Used ◽  
Styrene Butadiene

Abstract A wide range of polymers has been used for wire and cable insulation. Older materials include natural, butyl, and styrene-butadiene rubber. Newer materials include crosslinked polyethylene, silicone rubber, ethylene-propylene elastomers, and thermoplastic elastomers. Properties of importance to electrical insulation ability include dielectric constant, resistivity, dielectric loss, and dielectric strength. Flame resistance is also important in certain applications. This paper reviews the different polymeric materials used in cable constructions and the important electrical properties for material selection.

scholarly journals Analysis of the Impact on the Mechanical Properties of Modification of Oligohydroxyethers in Organic Solvent Solution with Rubbers

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 519
Author(s):  
Vitalii Bezgin ◽  
Agata Dudek ◽  
Adam Gnatowski
Keyword(s):  
Mechanical Properties ◽  
Scientific Paper ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Molecular Weights ◽  
Wide Range ◽  
Strength Tests ◽  
Materials Used ◽  
Styrene Butadiene ◽  
The Impact

This paper proposes and presents the chemical modification of linear hydroxyethers (LHE) with different molecular weights (380, 640, and 1830 g/mol) with the addition of three types of rubbers (polysulfide rubber (PSR), polychloroprene rubber (PCR), and styrene-butadiene rubber (SBR)). The main purpose of choosing this type of modification and the materials used was the possibility to use it in industrial settings. The modification process was conducted for a very wide range of modifier additions (rubber) per 100 g LHE. The materials obtained in the study were subjected to strength tests in order to determine the effect of the modification on functional properties. Mechanical properties of the modified materials were improved after the application of the modifier (rubber) to polyhydroxyether (up to certain modifier content). The most favorable changes in the tested materials were registered in the modification of LHE-1830 with PSR. In the case of LHE-380 and LHE-640 modified in cyclohexanol (CH) and chloroform (CF) solutions, an increase in the values of the tested properties was also obtained, but to a lesser extent than for LHE-1830. The largest changes were registered for LHE-1830 with PSR in CH solution: from 12.1 to 15.3 MPa for compressive strength tests, from 0.8 to 1.5 MPa for tensile testing, from 0.8 to 14.7 MPa for shear strength, and from 1% to 6.5% for the maximum elongation. The analysis of the available literature showed that the modification proposed by the authors has not yet been presented in any previous scientific paper.

scholarly journals Improvement The Mechanical Properties of Styrene Butadiene Rubber By Using Silica Fume

2017 ◽  
Vol 2 (12) ◽  
pp. 31
Author(s):  
Ali Abed Salman
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Flexural Strength ◽  
Silica Fume ◽  
Polymeric Materials ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Materials Used ◽  
Styrene Butadiene

Styrene butadiene rubber (SBR) is considered to be one of the greatest important polymeric materials used as a bond, so we discussed in this study to improve its properties .This study covers the effect of silica fume on mechanical properties of styrene butadiene rubber reinforced with silica fume. The composites were prepared with (1 to 3 wt. %) of silica fume particles .The results had indicated  that the tensile strength and flexural strength are improved by (11.6% and 13.5%) respectively at 2 wt% and the hardness is  improved by (9.3%) at 3wt%.

Preferential Media for Abrasive Flow Machining

2009 ◽  
Vol 131 (1) ◽  
Author(s):  
Kamal K. Kar ◽  
N. L. Ravikumar ◽  
Piyushkumar B. Tailor ◽  
J. Ramkumar ◽  
D. Sathiyamoorthy
Keyword(s):  
Rheological Properties ◽  
Testing Machine ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Abrasive Flow Machining ◽  
Wide Range ◽  
Good Improvement ◽  
Temperature Shear ◽  
Styrene Butadiene ◽  
Surface Improvement

The abrasive flow machining (AFM) is used to deburr, radius, polish and remove recast layer of components in a wide range of applications. Material is removed from the workpiece by a flowing semisolid mass across the surface to be finished. In this study a medium for AFM has been developed from the various viscoelastic carriers and has been contrasted through experimental investigation. The viscoelastic media are selected on the basis of existing media through the studies of thermogravimetric analysis and are characterized by mechanical, as well as rheological, properties with the help of a universal testing machine and a rheometer. The performance of the medium is evaluated through the finishing criteria on a two-way AFM setup. The investigation reveals that the styrene butadiene rubber (SBR) medium gives a good improvement in surface finish. The surface improvement through SBR media is 88%. It is also found that the strain, temperature, shear rate, time of applied constant stress, cyclic loading, etc. have an impact on the mechanical and rheological properties of the newly developed medium, which are ultimately governed by the performance of the medium in the target applications.

Ambient Electrical Properties of Mica-Styrene-Butadiene Rubber Composites

1988 ◽  
Vol 61 (4) ◽  
pp. 555-567 ◽  
Author(s):  
S. Debnath ◽  
Prajna P. De ◽  
D. Khastgir
Keyword(s):  
Silane Coupling Agent ◽  
Dielectric Strength ◽  
Dielectric Constants ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rubber Composites ◽  
Silane Coupling ◽  
Increasing Trend ◽  
Styrene Butadiene ◽  
Dielectric Loss Increase

Abstract We have studied the effect of addition of (a) mica, (b) silane coupling agent, and (c) silane-treated mica on the ambient dielectric properties of vulcanized styrene-butadiene rubber. It is observed that both dielectric constant and dielectric loss increase as mica, silane, and silane-treated mica are added. The increase is more pronounced in the case of silane-treated mica than for the untreated mica systems. The observed values of dielectric constants are in close agreement with the calculated ones obtained from different theories of heterogeneous dielectrics. Dielectric strength shows an increasing trend in the presence of mica. At higher mica loading, D.C. conductivity decreases slightly.

Influence of Powder Surface Treatment on the Dispersion Behavior of Silica into Polymeric Materials

2002 ◽  
Vol 75 (4) ◽  
pp. 725-737 ◽  
Author(s):  
Alberto Scurati ◽  
Ica Manas-Zloczower ◽  
Donald L. Feke
Keyword(s):  
Surface Treatment ◽  
Coupling Agent ◽  
Polymeric Materials ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Powder Surface ◽  
Precipitated Silica ◽  
Controlled Flow ◽  
Styrene Butadiene ◽  
Effect Of Surface

Abstract The effect of surface treatment on silica agglomerate dispersibility was investigated. Precipitated silica powders were treated with a commercially available coupling agent Bis-(triethoxysilylpropyl)-tetrasulphane (TESPT) in a blender. Spherical agglomerates of known density were prepared and dispersed in styrene butadiene rubber (SBR) under controlled flow conditions. The erosion kinetics was monitored by measuring the reduction in size of parent agglomerate with time. Silica dispersibility was greatly enhanced upon surface treatment. The coupling agent used in surface treatment is known to reduce filler—filler interactions and therefore affects the intrinsic cohesivity of the powder. However powder surface treatment can also induce changes in agglomerate morphology and filler-liquid interactions. The work presented in this paper evidences such changes.

Degradation of Hydrogenated Styrene—Butadiene Rubber at High Temperature

1997 ◽  
Vol 70 (5) ◽  
pp. 855-870 ◽  
Author(s):  
Mousumi De Sarkar ◽  
P. G. Mukunda ◽  
Prajna P. De ◽  
Anil K. Bhowmick
Keyword(s):  
Chain Scission ◽  
Anomalous Behavior ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Scanning Calorimetry ◽  
Ir And Nmr Spectroscopy ◽  
Wide Range ◽  
Styrene Butadiene ◽  
Different Levels ◽  
Thermal Stability Of

Abstract Degradation of hydrogenated styrene—butadiene rubber (HSBR) having different levels of unsaturation has been studied over a wide range of temperatures under anaerobic and aerobic conditions using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), IR and NMR spectroscopy. TGA data indicate higher thermal stability of hydrogenated rubber as compared to SBR in nitrogen, although an anomalous behavior is observed in air due to crosslinking and oxidation of styrene—butadiene rubber (SBR). Isothermal data confirm the above observations. IR and NMR results reveal thermal isomerization, cyclization, oxidation, depolymerization, and chain scission processes. The nature and amount of products formed depend on the time and temperature of degradation and also on the level of hydrogenation of SBR.

Effects of White Rot Fungus Physisporinus sp., Isolated in Japan, on Styrene-butadiene Rubber

2020 ◽  
Vol 93 (9) ◽  
pp. 289-292
Author(s):  
Yumi SHIMIZU ◽  
Shuma SATHO ◽  
Taro NAKAJIMA ◽  
Hiroaki KOUZAI ◽  
Kiminori SHIMIZU
Keyword(s):  
White Rot ◽  
White Rot Fungus ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Styrene Butadiene
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