Natural and Synthetic Rubber. XI. Constituents of the Milled Rubber Hydrocarbon

1932 ◽  
Vol 5 (4) ◽  
pp. 543-545
Author(s):  
Thomas Midgley ◽  
Albert L. Henne ◽  
Mary W. Renoll
Keyword(s):  
Continuous Series ◽  
Single Individual ◽  
Fractional Precipitation ◽  
Alcohol Mixture ◽  
Synthetic Rubber ◽  
Natural And Synthetic

Abstract The composition of milled rubber has been investigated by a method based on fractional precipitation from a benzene—alcohol mixture. This has shown that milled rubber is made of a continuous series of undefined components, without a single predominating individual. The same method had previously shown that one single individual constituted more than one-half of unmilled rubber.

Natural and Synthetic Rubber. VII. Fractional Precipitation of Natural Rubber

1931 ◽  
Vol 4 (4) ◽  
pp. 547-551
Author(s):  
Thomas Midgley ◽  
Albert L. Henne ◽  
Mary W. Renoll
Keyword(s):  
Natural Rubber ◽  
Fractional Precipitation ◽  
Synthetic Rubber ◽  
Alcohol Benzene ◽  
Natural And Synthetic

Abstract Temperature—concentration diagrams are given of the systems natural rubber—alcohol—benzene, pure rubber—alcohol—benzene and synthetic rubber—alcohol—benzene. A method based on these diagrams is given for the separation of nitrogen-free rubber hydrocarbon by fractional precipitation of natural rubber from a mixture of alcohol and benzene.

NATURAL AND SYNTHETIC RUBBER. VII. FRACTIONAL PRECIPITATION OF NATURAL RUBBER

1931 ◽  
Vol 53 (7) ◽  
pp. 2733-2737 ◽  
Author(s):  
Thomas. Midgley ◽  
Albert L. Henne ◽  
Mary W. Renoll
Keyword(s):  
Natural Rubber ◽  
Fractional Precipitation ◽  
Synthetic Rubber ◽  
Natural And Synthetic

Natural and Synthetic Rubber. X. Constituents of the Rubber Hydrocarbon

1932 ◽  
Vol 5 (4) ◽  
pp. 537-542
Author(s):  
Thomas Midgley ◽  
Albert L. Henne ◽  
Mary W. Renoll
Keyword(s):  
Physical Constant ◽  
Single Component ◽  
Fractional Precipitation ◽  
Synthetic Rubber ◽  
Natural And Synthetic

Abstract 1. Fractional precipitation has been used to determine and isolate the constituents of the rubber hydrocarbon. 2. A “standard precipitation point” has been devised and its use advanced as a physical constant of rubber. 3. The presence of a single component, amounting to more than 50% and characterized by a standard precipitation point of 35°, has been demonstrated. 4. The presence of highly soluble portions, of indeterminate s. p. p., has been shown.

Natural and Synthetic Rubber. XVII. The Separation of Sol Rubber and Gel Rubber

1937 ◽  
Vol 10 (4) ◽  
pp. 641-642
Author(s):  
Thomas Midgley ◽  
Albert L. Henne
Keyword(s):  
Precipitation Method ◽  
Fractional Precipitation ◽  
Synthetic Rubber ◽  
Natural And Synthetic

Abstract Sol rubber prepared by a single diffusion in ether can be separated into two components by fractional precipitation, whereas sol rubber prepared by a single fractional precipitation completely diffuses in ether, thus indicating the superiority of the fractional precipitation method as a means of preparing sol rubber.

scholarly journals Alternative of bone china and porcelain as ceramic hand molds for rubber latex glove films formation via dipping process

2020 ◽  
Vol 59 (1) ◽  
pp. 523-537
Author(s):  
Chaturaphat Tharasana ◽  
Aniruj Wongaunjai ◽  
Puwitoo Sornsanee ◽  
Vichasharn Jitprarop ◽  
Nuchnapa Tangboriboon
Keyword(s):  
Thermal Expansion ◽  
Flexural Strength ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Mold Surface ◽  
Rubber Latex ◽  
Latex Glove ◽  
Bone China ◽  
Synthetic Rubber ◽  
Natural And Synthetic

AbstractIn general, the main compositions of porcelain and bone china composed of 54-65%wt silica (SiO2), 23-34% wt alumina (Al2O3) and 0.2-0.7%wt calcium oxide (CaO) suitable for preparation high quality ceramic products such as soft-hard porcelain products for teeth and bones, bioceramics, IC substrate and magneto-optoelectroceramics. The quality of ceramic hand mold is depended on raw material and its properties (pH, ionic strength, solid-liquid surface tension, particle size distribution, specific surface area, porosity, density, microstructure, weight ratio between solid and water, drying time, and firing temperatures). The suitable firing conditions for porcelain and bone china hand-mold preparation were firing at 1270°C for 10 h which resulted in superior working molds for making latex films from natural and synthetic rubber. The obtained fired porcelain hand molds at 1270°C for 10 h provided good chemical durability (10%NaOH, 5%HCl and 10%wtNaCl), low thermal expansion coefficient (5.8570 × 10−6 (°C−1)), good compressive (179.40 MPa) and good flexural strength (86 MPa). While thermal expansion coefficient, compressive and flexural strength of obtained fired bone china hand molds are equal to 6.9230 × 10−6 (°C−1), 128.40 and 73.70 MPa, respectively, good acid-base-salt resistance, a smooth mold surface, and easy hand mold fabrication. Both obtained porcelain and bone china hand molds are a low production cost, making them suitable for natural and synthetic rubber latex glove formation.

Natural and Synthetic Rubber. IV. 4-Methyl-4-Octene by Isoprene Ethylation

1930 ◽  
Vol 3 (3) ◽  
pp. 483-484
Author(s):  
Thomas Midgley ◽  
Albert L. Henne
Keyword(s):  
Double Bond ◽  
Synthetic Rubber ◽  
Double Bond System ◽  
Bond System ◽  
Usual Behavior ◽  
Natural And Synthetic ◽  
Long Chains

Abstract Isoprene has been ethylated; 4-methyl-4-octene was formed exclusively. The structure of this nonene is in agreement with the usual behavior of a conjugated double bond system. This type of addition is further evidence in favor of the hypothesis which regards the polymerization of isoprene to synthetic rubber as the formation of long chains of isoprene units linked together- by ordinary valences in the 1,4-position.

NATURAL AND SYNTHETIC RUBBER. XI. CONSTITUENTS OF THE MILLED RUBBER HYDROCARBON

1932 ◽  
Vol 54 (8) ◽  
pp. 3381-3383 ◽  
Author(s):  
Thomas Midgley ◽  
Albert L. Henne ◽  
Mary W. Renoll
Keyword(s):  
Synthetic Rubber ◽  
Natural And Synthetic

Natural and Synthetic Rubber. XVI. The Structure of Polystyrene

1936 ◽  
Vol 58 (10) ◽  
pp. 1961-1963 ◽  
Author(s):  
Thomas Midgley ◽  
Albert L. Henne ◽  
Henry M. Leicester
Keyword(s):  
Synthetic Rubber ◽  
Natural And Synthetic
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