Carbon and Hydrogen in Rubber Hydrocarbon

Wing, Henry J.

doi:10.1126/science.105.2727.363

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…In the determination of the constitution and structure of a molecule and also for identification of a compound or mixture, a total quantitative analysis of all the elements present often gives valuable information. Smith, Saylor, and Wing analyzed puri-fied natural-rubber hydrocarbon (194,237) and found that the sum of the carbon and hy-drogen totals very close to 100%; this indicates the presence of very little, if any, combined oxygen. It is unfortunate that at that time there was no reliable method for an accurate direct determination of oxygen.…”

Section: Elemental Analysismentioning

confidence: 99%

Natural and Synthetic Rubbers

Bekkedahl¹

1949

Anal. Chem.

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Section: Elemental Analysismentioning

confidence: 99%

Natural and Synthetic Rubbers

Bekkedahl¹

1949

Anal. Chem.

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“…References to the earlier work are given in a paper by Wagman and Rossini [ 4 ]. The method was employed to give information regarding the composition of purified natural rubber by Smith, Saylor, and Wing [ 5 , 6 ]. The present work was initiated in 1944 as a part of the government synthetic rubber program [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Determination of copolymer composition by combustion analysis for carbon and hydrogen

Wood¹,

Madorsky²,

Paulson³

1960

J. RES. NATL. BUR. STAN. SECT. A.

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A d etailed d esc ription is given of t he method of combustion a na lysis for carbon and hydrogen to determine the co mpos ition of a copoly me r from its carbo ll-hyd roge n ratio. Th e ap paratus a nd procedu res have been d eveloped at the Nationa l Bureau of Stand a rd s over a period o f years. The method has been app lied chiefly to determine what fraction of a styre n e~but adien e co p o l ym~r is d eriv ed [rom styrene. l\1inor in g l·edi nts are r emoved by extraction, with t he exception of the bound mercapta n re idue for whic h correcLion mu t be made. The amo un t of bound mercap tan res idu e is determin ed from measure me nts of t ile sulfur content of t he copolymer by t he Carius method. Meas urement a re made of t he oxygen con Lent a nd Lhe ash co ntent, a lLho ugh the e do not enter in to the calculations. The ~tan dard deviation of a meas urement of carbon-hydrogen ratio is a pproximately 0.001 0 and IS Inde pendent o f sLy rene contenL. This corresponds to a stand ard deviation of about 0.036-percent bound styrene for pol y mers of low styrene co ntent a nd 0.018 percent for polyme rs o f hi g h styre ne conten t. Th e acc uracy of t he meL hod is d emonstrated bv t he fact thaL observ ,tLions o f carbon-hydrogen ratio for fou r out of fiv e samples of po lyb utadiene differed by less Lhan one standard devi ation from t he theoretical valu e.

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Tetramethylthiuram disulfide vulcanization of extracted rubber. IV. Behavior of rubber as an acid

Craig¹,

Juve²,

Davidson³

1951

J. Polym. Sci.

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Abstract(1) The reaction of rubber with zinc palmitate was found to liberate palmitic acid at low pressures, thus revealing that rubber is acidic. (2) The reaction of zinc oxide with palmitic acid in toluene solution was enhanced by the presence of water. (3) The small increase in the nitrogen content of rubber caused by its reaction with TMTD was equivalent to the palmitic acid liberated by the zinc palmitate reaction. (4) The use of TMTD as a reagent for organic acids has been studied and found to convert carboxyl groups into dimethylamide groups. This result suggests that the acidic nature of rubber is due to carboxyl groups in the rubber molecule, a suggestion which is compatible with the nearly complete removal of zinc from the TMTD vulcanizate by the zinc removal technique.

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Carbon and Hydrogen in Rubber Hydrocarbon

Cited by 5 publications

References 3 publications

Natural and Synthetic Rubbers

Natural and Synthetic Rubbers

Determination of copolymer composition by combustion analysis for carbon and hydrogen

Tetramethylthiuram disulfide vulcanization of extracted rubber. IV. Behavior of rubber as an acid

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