GR-S Latexes in Foam Rubber

1952 ◽  
Vol 25 (4) ◽  
pp. 972-982
Author(s):  
Leon Talalay ◽  
Anselm Talalay
Keyword(s):  
Tensile Strength ◽  
Low Temperature ◽  
Degree Of Conversion ◽  
Proper Choice ◽  
High Solids ◽  
Elongation At Break ◽  
Foam Rubber ◽  
Mooney Viscosity ◽  
Styrene Content

Abstract The superiority of cold GR-S high-solids latex over latex polymerized at 120° F has been demonstrated in foam rubber in terms of greater tensile strength, better elongation at break, higher modulus, improved rebound elasticity, and enhanced low temperature properties. The magnitude of the effect observed is far greater than the corresponding improvement reported in tire tread stocks. A number of polymer modifications in low-temperature polymerized latex were investigated. It was shown that, by the proper choice of styrene content (approximately 10 per cent bound), GR-S foam rubber superior to Hevea foam in subzero properties can be made. The modulus of foam rubber improved significantly with rising Mooney viscosity of the contained polymer, while the elongation at break was affected adversely. The degree of conversion was found to have little bearing on the properties of the resultant foam rubber.

Tensile Properties of Films from Low-Temperature GR-S Latex

1954 ◽  
Vol 27 (1) ◽  
pp. 302-319
Author(s):  
R. W. Brown ◽  
W. E. Messer ◽  
L. H. Howland
Keyword(s):  
Tensile Strength ◽  
Fatty Acid ◽  
Low Temperature ◽  
Sodium Salt ◽  
Charge Ratio ◽  
Rosin Soap ◽  
High Solids ◽  
Mooney Viscosity ◽  
Cure Rates ◽  
Butadiene Styrene

Abstract Studies were made of the influence of a number of polymerization variables on the tensile strength of vulcanized evaporated films from low-temperature high-solids GR-S latexes. Previous reports of film tensiles on the order of 3000 pounds per square inch for latexes of 70/30 butadiene-styrene charge ratio were confirmed. The levels of accelerator necessary for optimum vulcanized properties were found to be considerably lower than those normally used, particularly for latexes shortstopped with dithiocarbamate salts. Microscopic coagulum found in some latex samples had a pronounced effect in decreasing film tensile of vulcanizates. Cured films from latexes emulsified with mixtures of fatty acid and rosin soap possessed considerably better tensile strengths than those from latexes using all fatty acid soap emulsification. Wide variations on Mooney viscosity had relatively little effect on ultimate film tensiles. Incorporation of small amounts of lignin into the latex as the ammonium or sodium salt decreased cure rates of films and aided in giving more reproducible tensile results. Both lignin and the sodium salt of cresyl monosulfide improved the aging characteristics of films.

High Quality Foams from NIR Latex

1966 ◽  
Vol 39 (3) ◽  
pp. 755-762
Author(s):  
S. N. Angove ◽  
E. S. Graham ◽  
G. Hilditch ◽  
R. A. Stewart ◽  
F. L. White
Keyword(s):  
Tensile Strength ◽  
Low Temperature ◽  
Natural Rubber ◽  
Compression Modulus ◽  
High Modulus ◽  
High Tensile Strength ◽  
High Quality ◽  
Foam Rubber ◽  
Oil Resistance ◽  
Low Temperature Flexibility

Abstract Foam rubber properties have been measured for NIR latexes as a function of acrylonitrile content of the copolymer and as a function of ratio of NIR latex to NR latex and high modulus SBR latex. Foam rubber made from NIR latex had good aging and oil resistance, combined with the desirable high tensile strength and elongation characteristic of natural rubber foam. Resilience and low temperature flexibility of NIR foams were found to be lower than that achieved with foams of either SBR or NR latexes. Although compression modulus of NIR foam was lower than that of a high modulus SBR foam and approximately equivalent to that of NR foam, it was effectively increased by the addition of either such SBR latex or a high-styrene resin latex.

The Experimental Research of SMR/SBR Inner Tube with RIIR

2009 ◽  
Vol 87-88 ◽  
pp. 493-498 ◽  
Author(s):  
Xian Kui Zeng ◽  
Chuan Sheng Wang ◽  
Hui Guang Bian ◽  
Lei Guo
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Experimental Research ◽  
Room Temperature ◽  
Processing Technology ◽  
Elongation At Break ◽  
Tear Strength ◽  
Air Tightness ◽  
Mooney Viscosity

Application of SMR / SBR inner tube with the IIR reclaimed rubber were investigated in the paper. The mechanical properties such as strength, hardness and Mooney viscosity of the materials were measured. The results showed that Elongation at break and tear strength decreased a little, while tensile strength,Viscosity, the air tightness and hardness are improved by adding RIIR in SMR/SBR ,which can accelerate the curing speed of the materials under room temperature. The results indicated that RIIR in SMR/SBR formula can meet the requirement of the processing technology of tube compound.

Cure and Mechanical Properties of Natural Rubber Filled Bacterial Cellulose

2016 ◽  
Vol 705 ◽  
pp. 40-44
Author(s):  
Chaiwute Vudjung
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Natural Rubber ◽  
Bacterial Cellulose ◽  
Elongation At Break ◽  
Roll Mill ◽  
Cure Time ◽  
Mooney Viscosity

Natural rubber (NR) containing the nata de coco fiber or Bacterial cellulose (BC) was prepared by co-coagulation of BC and concentrated NR latex with CaCl2 and compounded by two roll mill. The effect of BC content was the important factor in this study. It was that found tensile strength and elongation at break of NR filled BC (NR/BC) decreased with increasing BC content. The addition of BC into NR affect Mooney viscosity of NR/BC masterbatch, with increasing BC content, scorch time and cure time of their compound decreased.

Silica-Reinforced Natural Rubber Compounds Compatibilized through the Use of Epoxide Functional Groups and TESPT Combination

2013 ◽  
Vol 844 ◽  
pp. 272-275 ◽  
Author(s):  
Karnda Sengloyluan ◽  
Kannika Sahakaro ◽  
Jacques W.M. Noordermeer
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Functional Groups ◽  
Epoxidized Natural Rubber ◽  
Elongation At Break ◽  
Payne Effect ◽  
Rubber Compounds ◽  
Mooney Viscosity

Epoxidized natural rubber (ENR) and bis-(3-triethoxysilylpropyl) tetrasulfide (TESPT) were used to improve the properties of silica-filled NR. The use of ENR containing 51 mol% epoxide groups (ENR-51) as a compatibilizer without TESPT was optimized at 7.5 phr, based on the results of Payne effect and tensile strength. By using 7.5 phr of ENR-51 with varying amounts of TESPT in a range of 2 to 5 wt% relative to the silica, the properties of compounds were compared to those of the ones with optimum TESPT content (i.e. 8.6 wt% relative to the silica) and without. The addition of TESPT to the ENR-51 compatibilized silica-filled NR compound had no effect on Mooney viscosity but lowered the Payne effect to the same level as that of the silica/TESPT compound, and significantly decreased both scorch and optimum cure times. The silica-filled NR with ENR and the small amount of TESPT combination showed a further increase in tensile strength to match that of the optimized silica/TESPT system, while maintained the elongation at break. This work demonstrates that the use of ENR as compatibilizer clearly enhances the properties of silica-filled NR compounds, and that such properties can be further improved by adding TESPT at a half or less amount of TESPT normally needed for silica-filled compounds.

CRUCIBLE D6

Alloy Digest ◽  
1962 ◽  
Vol 11 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Low Temperature ◽  
High Strength Steel ◽  
High Strength ◽  
Heat Treating ◽  
Steel Company ◽  
Temperature Performance ◽  
Ultra High Strength Steel ◽  
Crucible Steel

Abstract Crucible D6 is a low alloy ultra-high strength steel developed for aircraft-missile applications and primarily designed for use in the 260,000-290,000 psi tensile strength range. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on low temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-129. Producer or source: Crucible Steel Company of America.

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