Silica- and Clay-Reinforced Carboxylated Nitrile Rubber Vulcanized by a Mixed Crosslinking System

1982 ◽  
Vol 55 (4) ◽  
pp. 990-1003 ◽  
Author(s):  
S. K. Chakraborty ◽  
S. K. De
Keyword(s):  
Polymer Chain ◽  
Coupling Agent ◽  
Nitrile Rubber ◽  
Carboxyl Groups ◽  
Failure Behavior ◽  
Fracture Surfaces ◽  
Polymer Filler ◽  
Essential Properties ◽  
Sem Studies

Abstract The polymer-filler interaction of silica- and clay-filled XNBR vulcanizates has been analyzed. The presence of carboxyl groups in the polymer chain gives better polymer-filler interaction, and no coupling agent is essential. Properties of silica-filled XNBR vulcanizates containing different carboxyl contents in the polymer chain have also been studied. SEM studies of fracture surfaces have been made to understand the failure behavior of gum and filled vulcanizates.

scholarly journals Erratum to “SEM studies of tensile fracture surfaces of polypropylene-sawdust composites” [Polymer testing, 22 (2003) 819–824]

2004 ◽  
Vol 23 (4) ◽  
pp. 487 ◽  
Author(s):  
João Carlos Miguez Suarez ◽  
Fernanda M.B Coutinho ◽  
Thaís H Sydenstricker
Keyword(s):  
Tensile Fracture ◽  
Fracture Surfaces ◽  
Sem Studies ◽  
Polymer Testing

SEM studies of tensile fracture surfaces of polypropylene—sawdust composites

2003 ◽  
Vol 22 (7) ◽  
pp. 819-824 ◽  
Author(s):  
João Carlos Miguez Suarez ◽  
Fernanda M.B. Coutinho ◽  
Thaís H. Sydenstricker
Keyword(s):  
Tensile Fracture ◽  
Fracture Surfaces ◽  
Sem Studies

Studies of Polymer-Filler Interaction, Network Structure, Physical Properties, and Fracture of Silica-and Clay-Filled EPDM Rubber in the Presence of a Silane Coupling Agent

1983 ◽  
Vol 56 (4) ◽  
pp. 737-773 ◽  
Author(s):  
P. K. Pal ◽  
S. K. De
Keyword(s):  
Physical Properties ◽  
Network Structure ◽  
Coupling Agent ◽  
Crosslink Density ◽  
Silane Coupling Agent ◽  
Interaction Network ◽  
Epdm Rubber ◽  
Polymer Filler ◽  
Silane Coupling ◽  
Tear Properties

Abstract 1. A silane coupling agent (Si-69) reduces the viscosity and increases the scorch lime in silica- and clay-filled EPDM. The cure lime of silica-filled mixes remained unchanged and that of clay-filled mixes increased on addition of Si-69. 2. In the presence of Si-69, the silica-EPDM system exhibits higher polymer-filler interaction than the clay-EPDM system. 3. Vulcanizates containing Si-69 exhibit higher apparent crosslink density and a higher proportion of polysulfidic crosslinks than the control vulcanizates. 4. Vulcanizates containing Si-69 show improved physical properties. Lower tensile and tear properties in vulcanizates with Si-69 at higher filler loadings is explained via a slippage mechanism. 5. SEM studies of fractured surfaces created under tension, tear, flexing, and abrasion have been made, and changes in the strength of the vulcanizates have been correlated with the fractographs.

Yeast as Coupling Agent for Corn Filler in Tyre Tread Compound

2005 ◽  
Vol 21 (3) ◽  
pp. 231-242 ◽  
Author(s):  
S.L. Agrawal ◽  
S.K. Mandot ◽  
N. Mandal ◽  
S. Bandyopadhyay ◽  
R. Mukhopadhyay ◽  
...  
Keyword(s):  
Carbon Black ◽  
Natural Resources ◽  
Coupling Agent ◽  
Energy Efficient ◽  
Silane Coupling Agent ◽  
Rolling Resistance ◽  
Naturally Occurring ◽  
Polymer Filler ◽  
Silane Coupling

Tyre manufacturers are continually developing energy efficient, low rolling resistance tyres, using more and more naturally occurring materials, with minimum depletion of petroleum/natural resources. Of all the components of a typical tyre, the tread component contributes most to rolling resistance properties. So continuous efforts are in progress around the globe to develop suitable tread compounds in order to fulfil the above criteria with different filler combinations, including treated fillers. In the present study, the effect of a naturally occurring coupling agent, yeast, was investigated in the context of a corn – carbon black filler system, and the results were compared with those for corn powder treated with a silane coupling agent – carbon black system in a radial passenger tyre tread compound. The yeast increased polymer-filler interaction significantly by modifying the corn surface, giving rise to optimum properties for the tread compound.

Interaction between Carboxylated Nitrile Rubber and Precipitated Silica: Role of (3-Aminopropyl)Triethoxysilane

1996 ◽  
Vol 69 (4) ◽  
pp. 637-647 ◽  
Author(s):  
Sumanda Bandyopadhyay ◽  
P. P. De ◽  
D. K. Tripathy ◽  
S. K. De
Keyword(s):  
Physical Properties ◽  
Coupling Agent ◽  
Spectroscopic Studies ◽  
Nitrile Rubber ◽  
Dynamic Mechanical ◽  
Precipitated Silica ◽  
Silica Filler ◽  
Bound Rubber ◽  
Rubber Filler

Abstract On the basis of measurements of bound rubber and physical properties and the results of Monsanto rheometer, dynamic mechanical and infrared spectroscopic studies, it is observed that strong rubber-filler interaction occurs between XNBR and precipitated silica filler. During molding, XNBR was found to be crosslinked by the filler surface through the formation of primary bonds. The coupling agent, namely (3-aminopropyl)triethoxysilane facilitates the formation of rubber-filler bonds at the expense of filler-filler networks, leading to improved dispersion and enhanced degree of crosslinking.

Adsorption of monodisperse polybutadienes on carbon black, 1 Adsorption from dilute and semi-dilute solutions

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Kathy Vuillaume ◽  
Bassel Haidar ◽  
Alain Vidal
Keyword(s):  
Carbon Black ◽  
Polymer Chain ◽  
Anionic Polymerization ◽  
Polymer Concentration ◽  
Three Dimensional ◽  
Percolation Process ◽  
Molecular Weights ◽  
Polymer Filler ◽  
Adsorbed Polymer ◽  
Filler Network

Abstract A series of polybutadienes (PBs) of different molecular weights (in the range of 3000 to 120 000) but of identical microstructure (1,2-PB content ≈ 80%) was synthesized via anionic polymerization. The adsorption in solution of the various monodisperse PBs on carbon black (CB) was studied for different polymer/ CB ratios as well as for polymer and CB concentrations in the range of 0.1 to 100 g/l. The amount of adsorbed polymer was followed and was found to be essentially governed by the polymer concentration, which determines also the conformation of the polymer chain on the filler surface. CB concentration didn’t prove to be a pertinent parameter, whereas the polymer/filler ratio was found to control the formation of the three-dimensional polymer-filler network on the basis of a percolation process. Results are discussed with respect to the available theories.

scholarly journals Peculiarities of stress corrosion fracture of sensitized and neutron irradiated chromium-nickel austenitic steel

2022 ◽  
Vol 2155 (1) ◽  
pp. 012011
Author(s):  
A V Yarovchuk ◽  
A S Dikov ◽  
K V Tsay
Keyword(s):  
Stress Corrosion ◽  
Austenitic Steel ◽  
Structural Features ◽  
Intergranular Cracking ◽  
Reinforcing Effect ◽  
Corrosion Fracture ◽  
Fracture Surfaces ◽  
Corrosive Solution ◽  
Sem Studies

Abstract The results of SEM studies of fracture surfaces for the 12Cr18Ni9 austenitic steel ruptured under a fixedtensile load in FeCl3 water solutionand in air are presented. The samples of austenized, sensitized at 650° and irradiated with neutrons (to 1020n/cm2) steel were examined. It was shown thatirradiation hardening and sensitizing annealing increased the susceptibility of steel to intergranular cracking in corrosive solution. Structural features of formation of the strain-induced α’-martensite and its reinforcing effect on fracture in various environments are discussed.

Thermoplastic Vulcanizates Filled with а Layered Silicate

2019 ◽  
Vol 816 ◽  
pp. 119-123
Author(s):  
Svetoslav Isaakovich Volfson ◽  
N.A. Okhotina ◽  
Alina Ildusovna Nigmatullina
Keyword(s):  
Polymer Chain ◽  
Fractal Analysis ◽  
Structural Characteristics ◽  
Layered Silicate ◽  
Nitrile Rubber ◽  
Performance Characteristics ◽  
Thermoplastic Vulcanizate ◽  
Thermoplastic Vulcanizates ◽  
Improved Performance ◽  
Butadiene Nitrile Rubber

Oil-resistant and thermoformed thermoplastic vulcanizates based on butadiene-nitrile rubber and polypropylene were obtained, containing a layered silicate montmorillonite as a filler. The structural characteristics of composites based on thermoplastic vulcanizates were studied using the methods of fractal analysis. It has been established that the value of the static flexibility of the polymer chain of a thermoplastic vulcanizate containing montmorillonite exceeds the static flexibility of the polymer chain of an unfilled thermoplastic vulcanizate. It is shown that the introduction of montmorillonite in the amount of 1-3 pbw in thermoplastic vulcanizates leads to improved performance characteristics of the obtained composites.

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