scholarly journals MODIFICATION OF MIXTURES BASED ON ETHYLENEPROPYLENE RUBBER AND SILICON ACID FILLER

2021 ◽  
Vol 64 (2) ◽  
pp. 81-86
Author(s):  
Olga Yu. Solovyeva ◽  
Andrey B. Vetoshkin ◽  
Sergey V. Gudkov ◽  
Elena L. Nikitina
Keyword(s):  
Strength Properties ◽  
Rubber Matrix ◽  
Cross Linking ◽  
Structure And Properties ◽  
Component Mixture ◽  
Static Test ◽  
Silica Filler ◽  
Bound Rubber ◽  
Silica Fillers ◽  
Filler Distribution

The aim of the work was to study the effect of bis-(triethoxysilylpropyl)-tetrasulfide (TESPT) mixed with carbon black N330 in a ratio of 1:1, as a technical product OFS 6945 on the structure and properties of rubber mixtures and rubbers based on ethylene propylene rubber of the brand Vistalon 2504N and silica filler (KKN) of the brand Rosil-175, taken at a dosage of 30 wt. h. per 100 wt.h. rubber. The content of TESPT was 0.035, 0.050 and 0.070 mmol / 100 g of rubber. A group of vulcanizing agents included sulphur, thiuram, captax, zinc oxide and technical stearin. Rubber mixtures were prepared on rollers Lb 320 160/160. Organosilane was injected into rubber at the same time as Rosil-175. The homogeneity of the filler distribution in the finished mixtures was evaluated based on the results of testing samples on the RPA-2000 vibrorheometer. Vulcanization characteristics were determined using an MDR-2000 device. The structure of mixtures and rubbers was studied by the method of equal swelling of samples in toluene. It is shown that with the increasing content of TESPT, the proportion of bound rubber in a three-component mixture of the rubber – filler – organosilane increases due to the formation of interfacial connections. The uniformity of distribution of silica fillers in rubber matrix also increases. Workability of the mixtures on roller equipment improves. The rate of cross-linking in the core period and the degree of cross-linking of macromolecules at the same time curing increase as well. As a result, the elastic-strength properties of rubbers determined in the static test mode are improved, the best complex of which is provided with an organosilane content of 0.050 mmol/100 g of rubber.

EFFECTS OF SILANE COUPLING AGENTS ON STRUCTURE AND PROPERTIES OF SILICA-FILLED SILICONE RUBBER/STYRENE BUTADIENE RUBBER COMPOSITES

2018 ◽  
Vol 91 (2) ◽  
pp. 453-468 ◽  
Author(s):  
Hong-Yuan Ren ◽  
Zheng Sun ◽  
Li-Qun Zhang ◽  
You-Ping Wu ◽  
Qiang Huang ◽  
...  
Keyword(s):  
Styrene Butadiene Rubber ◽  
Coupling Agents ◽  
Butadiene Rubber ◽  
Structure And Properties ◽  
Silane Coupling Agents ◽  
Rubber Content ◽  
Bound Rubber ◽  
Silane Coupling ◽  
Styrene Butadiene ◽  
Rubber Filler

ABSTRACT Two silane coupling agents, bis-(γ-triethoxysilylpropyl)-tetrasulfide (Si69) and vinyltriethoxysilane (A151), were selected to investigate their effects on structure and properties of silica-filled methyl vinyl silicone rubber (VMQ)/emulsion styrene butadiene rubber (ESBR) composites. The filler–rubber interactions were investigated via bound rubber content and solid-state 1H low-field nuclear magnetic resonance (NMR) spectroscopy, and the mass ratio of VMQ and ESBR in the rubber–filler gel was investigated by thermogravimetric analysis (TGA). The results revealed that VMQ showed a better compatibility with silica than ESBR. Compared with the A151 composite, the composite with Si69 showed the higher content of ESBR in rubber–filler gel, which resulted in the higher bound rubber content and the weaker Payne effect, and it also exhibited higher tensile strength, higher tear strength, better wear resistance, and lower hardness. However, the presence of Si69 reduced the crosslink efficiency of ESBR and completely inhibited the crosslinking of VMQ, which caused the composite to show higher tan δ value at 60 °C than the A151 composite.

Microvia Formation for Multi-Layer PWB by Laser Direct Drilling: Improvement of Hole Quality by Silica Fillers in Build-Up Layer

2011 ◽  
Author(s):  
Keiji Ogawa ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Kuniyoshi Obata ◽  
Tsukasa Ayuzawa
Keyword(s):  
Copper Foil ◽  
Fem Analysis ◽  
Printed Wiring Boards ◽  
The Finite Element Method ◽  
Silica Filler ◽  
Silica Fillers ◽  
Via Holes ◽  
Overhang Length ◽  
Novel Method ◽  
Direct Drilling

Microvia formation technology using lasers has become the dominant method for drilling microvia called blind via-holes (BVHs) in printed wiring boards (PWBs). Laser direct drilling (LDD), drilling directly outer copper foil by laser, has attracted attention as a novel method. In particular, when copper and resin with different processing thresholds are drilled at the same time, an overhang defect occurs on the drilled hole. However, the overhang generation mechanism has not been clarified. Therefore, we investigated it by detailed observation of the drilled-hole section. Moreover, the overhang length was estimated using the finite element method (FEM). Influences of surface treatment of outer copper foil and thermal properties of the build-up layer were evaluated experimentally and analytically. Consequently, an experiment with a prototype PWB with silica filler added in the build-up layer was carried out. Using the prototype PWBs, the overhang was reduced as shown in FEM analysis results.

Effects of Alkylation of Silica Filler on Rubber Reinforcement

1994 ◽  
Vol 67 (5) ◽  
pp. 834-844 ◽  
Author(s):  
Yu-Chun Ou ◽  
Zhong-Zhen Yu ◽  
A. Vidal ◽  
J. B. Donnet
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Volume Fraction ◽  
Acid Base ◽  
Polymer Filler ◽  
Silica Filler ◽  
Bound Rubber ◽  
Filler Dispersion ◽  
Swelling Volume ◽  
Scanning Electron

Abstract Rubber reinforcement of silicas with different surface alkylation have been evaluated by studies of NH3-modified swelling, swelling volume fraction, stress-strain tests, and scanning electron microscopy. Effects of silica alkylation on filler dispersion has been explained on the basis of surface energy and acid-base interactions. Bound rubber reductions have been explained according to acid-base interactions and/or physical entanglements. Hysteresis losses have been interpreted based on the reductions of polymer-filler and filler-filler interactions. The results show that the extent of reinforcement in NR and SBR vulcanizates is reduced when the silicas are alkylated, especially in the case of the hexadecyl group. However, in NBR vulcanizates the alkylation seems to have less influence on the reinforcement characteristics of the silica.

Influence of cross-linking density on the structure and properties of the interphase within supported ultrathin epoxy films

2016 ◽  
Vol 51 (19) ◽  
pp. 9019-9030 ◽  
Author(s):  
Kai Li ◽  
Yan Li ◽  
Qingsong Lian ◽  
Jue Cheng ◽  
Junying Zhang
Keyword(s):  
Cross Linking ◽  
Structure And Properties

scholarly journals INFLUENCE TECHNOLOGICAL ADDITIVES ON PROPERTIES OF RUBBER BASED ON BUTADIENE-NITRILE CAOUTCHUC

2017 ◽  
Vol 60 (10) ◽  
pp. 53
Author(s):  
Ivan S. Spiridonov ◽  
Nikolay F. Ushmarin ◽  
Evgeniy N. Egorov ◽  
Sergey I. Sandalov ◽  
Nikolay I. Kol'tsov
Keyword(s):  
Carbon Black ◽  
Thermal Action ◽  
Strength Properties ◽  
Strength Characteristics ◽  
Rubber Matrix ◽  
Strength Index ◽  
Rubber Mixture ◽  
Butadiene Nitrile Rubber ◽  
Processing Aids ◽  
Hydrocarbon Media

Influence of various technological additives on processability of the rubber mixture and the elastic-strength properties of rubber based on butadiene-nitrile caoutchuc BNKS-28AMN was investigated. The study was conducted with the aim of establishing technological additives that increase the elastic-strength characteristics of rubber and its resistance to the action of aggressive hydrocarbon media. The composition of the rubber mixture to be studied included butadiene-nitrile rubber BNKS-28AMN, novoperoks BP-40, zinc monometacrylate, diaphene FP, acetononyl H, oligoester acrylates MGF-9 and TGM-3, carbon black filler P 803 and other ingredients. On lab rollers LB 320 150/150, rubber compound variants were prepared by mixing rubber with ingredients and processing aids. As technological additives were used lubstab-01, zinclet BB 222, dispersant Fl plus and oxanol CS-100. For the rubber mixture variants, the vulcanization characteristics on the MDR 3000 rheometer manufactured by Mon Tech were investigated. The rubber mixture was vulcanized in a two-storey hydraulic electrically heated press VP-400-2E at a temperature of 150 ° C for 30 min. Investigations of the elastic-strength properties of vulcanizates were carried out according to the existing standards for the rubber industry. The study of the thermo-aggressiveness of vulcanizates was carried out by determining the change in their elastic-strength properties after the thermal action of the standard liquid SZHR-1, as well as the change in mass after aging in a mixture of isooctane and toluene. As a result of the conducted studies it was found that the introduction of technological additives leads to an increase in the elastic-strength index of rubber by improving the dispersion of carbon black filler P 803 and other components of the mixture in the rubber matrix. The best elastic-strength characteristics and the smallest their change after exposure to aggressive hydrocarbonic fluids is characterized rubber containing zinkolet BB 222.Forcitation:Spiridonov I.S., Ushmarin N.F., Egorov E.N., Sandalov S.I., Kol'tsov N.I. Influence technological additives on properties of rubber based on butadiene-nitrile caoutchuc. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 10. P. 53-57

scholarly journals Influence of the chemical structure of cross-linking agents on properties of thermally reversible networks

2016 ◽  
Vol 88 (12) ◽  
pp. 1103-1116 ◽  
Author(s):  
Lorenzo Massimo Polgar ◽  
Robin R.J. Cerpentier ◽  
Gijs H. Vermeij ◽  
Francesco Picchioni ◽  
Martin van Duin
Keyword(s):  
Chemical Structure ◽  
Chemical Conversion ◽  
Rubber Matrix ◽  
Cross Linking ◽  
Cross Link ◽  
Molar Amount ◽  
Link Density ◽  
Cross Link Density ◽  
Cross Linker ◽  
The Cross

Abstract It is well-known that the properties of cross-linked rubbers are strongly affected by the cross-link density. In this work it is shown that for thermoreversibly cross-linked elastomers, the type and length of the cross-linker also have a significant effect. A homologous series of diamine and bismaleimide cross-linkers was used to cross-link maleic-anhydride-grafted EPM irreversibly and furan-modified EPM thermoreversibly, respectively. Bismaleimide cross-linkers with a polarity close to that of EPM and a relatively low melting point have a better solubility in the rubber matrix, which results in higher chemical conversion and, thus, higher cross-link densities at the same molar amount of cross-linker. Samples cross-linked with different spacers (aromatic and aliphatic spacers of different lengths) were compared at the same cross-link density to interpret the effects on the material properties. The rigid character of the short aliphatic and the aromatic cross-linkers accounts for the observed increase in hardness, Young´s modulus and tensile strength with respect to the longer, more flexible aliphatic cross-linkers. In conclusion, the structure of the cross-linking agent can be considered as an alternative variable in tuning the rubber properties, especially for thermoreversibly cross-linked rubber.

Reinforcing Effect of Silica and Silane Fillers on the Properties of Some Natural Rubber Vulcanizates

2003 ◽  
Vol 76 (5) ◽  
pp. 1290-1310 ◽  
Author(s):  
A. Ansarifar ◽  
R. Nijhawan ◽  
T. Nanapoolsin ◽  
M. Song
Keyword(s):  
Natural Rubber ◽  
Crosslink Density ◽  
Cyclic Fatigue ◽  
Rubber Matrix ◽  
Stored Energy ◽  
Elongation At Break ◽  
Reinforcing Effect ◽  
Bound Rubber ◽  
Technical Properties ◽  
Natural Rubber Vulcanizates

Abstract The reinforcing effect of up to 6 parts per hundred rubber by weight (phr) bis- (3-triethoxysilylpropyl) tetrasulfide (TESPT), a bifunctional organosilane, on the crosslink density, bound rubber, and technical properties of some conventional accelerator/sulfur compounds of natural rubber, containing 30 phr precipitated amorphous white silica was studied. The crosslink density and bound rubber improved as a function of TESPT loading. The tensile strength, elongation at break, stored energy density at rupture, and cohesive tear strength deteriorated at low loading of TESPT, but they subsequently increased after the full amount of TESPT was introduced into the compound. The improved properties of the vulcanizate was due to the better dispersion of the filler in the rubber matrix. However, the cyclic fatigue life was adversely affected, and the hardness hardly changed as a result of adding TESPT to the rubber.

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