A method for the purification of rubber and properties of the purified rubber

McPherson, Archibald T.

doi:10.6028/jres.008.056

Cited by 11 publications

(9 citation statements)

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“…The fractionation/purification process used produced relatively insoluble G fractions and relatively soluble S fractions (8.4, 15.1% gel) for the Hevea rubber materials, comparable to that of commercial deproteinized HA latex (16.2%). 17 In the case of guayule rubber, % gel in the control sample was low (11%), in agreement with other reports 6,18 and similar to that of Hevea S fractions (8.4% and 20.8%, respectively, for TPC-S and STR5L-S). Guayule GNR-S has even lower gel (3.8%).…”

Section: Resultssupporting

confidence: 91%

Protein influences on guayule and Hevea natural rubber sol and gel

McMahan

Kostyal

Lhamo

et al. 2015

J of Applied Polymer Sci

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Guayule (Parthenium argentatum) is under cultivation in the southwestern United States as an alternative source of natural rubber free from proteins that cause Type I latex allergies. However, since guayule lacks the protein‐polymer interactions present in Hevea latex, its physical and chemical properties may differ. The solvent‐soluble (Sol) and insoluble (Gel) fractions from guayule and Hevea natural rubbers were isolated through a solubilization/centrifugation deproteinization process. Protein could be reduced or removed by centrifugation, or concentrated in the gel fraction for both Hevea and guayule rubber. Separation of the sol fraction of Hevea rubber reduced the overall protein level, in some cases to below detection limits, without impacting rubber thermo‐oxidative stability. Notably, no detectable cross reactions took place between guayule protein antibodies and Hevea‐based materials, nor vice‐versa. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42051.

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Section: Resultssupporting

confidence: 91%

Protein influences on guayule and Hevea natural rubber sol and gel

McMahan

Kostyal

Lhamo

et al. 2015

J of Applied Polymer Sci

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“…Hence th e number of significan t figures used h ere shows only th e precision of th e present measurements of a sample of given composition. Earlier work [5,6] h as shown lit tle variation with composition in t h e fourth-pl ace index values, but further studies would b e r equired to show the effect of impurities on fif th -place and sixth-place values.…”

Section: ------------mentioning

confidence: 89%

“…The molecular relractivity can be calculated by the Lorenz-Lorentz relation from the present data by taking the value 0.906 g/cm 3 for the density at 25° C. of purified nat ural rubb er [5,7]. As poin ted out in the earlier paper [1] the r esul t, 22.82, is in sufficiently good agreement with values obtained by taking the sum of atomic r efrac t ivities to afford optical confirmation of the existence of a CsH a group conLaining one double bond as the unit group in rubber.…”

Section: Refractive Index Of Rubbermentioning

confidence: 92%

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Refractive index of natural rubber for different wavelengths

Wood¹,

Tilton²

1949

J. RES. NATL. BUR. STAN.

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The refracti ve indices of a prism of natural rubber have been measured a t fiv e differe nt wavelengths in the visible region b y t h e use of a spectrometer. Valu es af the rate of change of index with temperature at each wavelengt h have b een computed for the ran ge 19.5° to 30.3° C. The Eykman equation in d ifferential form is used to calculate t he expans ivi ty from the ind ex and its rate of change with temperature. It is concluded t hat the two-co nstant Cauchy and Sell meier d ispersion equation s a re inadequate to represent the data. The di spersion observed for rubber is found t o be essent iall y the same a s t hat of h yd ro carb ons of similar structure bllt of low molecular weight.

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“…The unvulcanized sample was prepared from natural rubber latex by the purification procedure of McPherson [3]. An analysis showed 98.7 percent rubber hydrocarbon, 0.44 percent protein, and 0.18 percent ash.…”

Section: Experimental Arrangementmentioning

confidence: 99%

Compressibility of natural rubber at pressures below 500 kg/cm2

Wood

Martin

1964

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

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The specifi c volumes of unvulca nizcd natural rubbcr and of a peroxide-cured vulcan izate of natural rubber were meas ured at press ures of 1-500 kg/cm2 at temperatur cs from 0 to 25°C. Observations on mercury-filled d ilatometers were made through a window in t he press urc system. No t ime effects or hysteres is phenomcna were observed. The spec ific volumc 17 in cm 3 /g over t he range studi ed can be r epresen ted by 17= V o,2511 + A(t -25 ) 111 + [a 25 + k,(t -25 )whcre P is t he press ure in k g/cm2, and t tIl e tcmperatu re in °C. The constants for thc un v ulcanized and for t he peroxide-cured samples are: 170,25 = 1.0951 and 1.1032 cm 3 /g; 10'A = 6.54 and 6.36 pCI' degree ; 106a25= -50.5 and -50.4 (kg/ cm2)-'; 106k ,= -0. 227 a nd -0.203 per dcgrec ; 1091325 = 10 and 11.5 (kg/cm2)-2; and 109k 2= 0.O L 18 and 0.073 p CI' degree, r es pcctively. The oompr essibili ty of unvulcanizcd natural rubbcr at 25° a nd 1 k g/cm2 is t hus 50.5 X 10-6 (kg/Clu2) -1 fa llin g to 40.6 X 10-6 (kg/ cm2) -1 at a press lll'e of 500 kg/cm 2. It I S concluded that a low deg rce of vulcanization produces no ignifi ca n t chan ges in the constants lis ted. The valu cs a re no t far d iffcren t from those obtained by extrapolating to zero s ulfur co ntcnt the observa tio ns of Scott on t ile rubbersulfur system. Calcula tions of valu es of compressibility (a nd i ts r eciprocal thc bulk modulus), " in te rn al press ure", bulk wave vclocity, difference be twee n sp ecifi c heats and severa l other physical propert ies are in r easonable agree mcnt with those obtained by d i;'ect obser vat ion by oth er worke rs. For t he prcd ietion of valu es at press ures above 50'0 ko-/eln2 the use of the Tait eq uation is recomme nd ed.

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A method for the purification of rubber and properties of the purified rubber

Cited by 11 publications

References 0 publications

Protein influences on guayule and Hevea natural rubber sol and gel

Protein influences on guayule and Hevea natural rubber sol and gel

Refractive index of natural rubber for different wavelengths

Compressibility of natural rubber at pressures below 500 kg/cm2

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