Hyperdeproteinized natural rubber prepared with urea

Klinklai, Warunee; Saito, Takayuki; Kawahara, Seiichi; Tashiro, Kei; Suzuki, Yosuke; Sakdapipanich, Jitladda; Isono, Yoshinobu

doi:10.1002/app.20463

Cited by 80 publications

(65 citation statements)

References 17 publications

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“…Remarkably, for the TPC‐S material, the process used reduced Hevea antigenic protein to below detection limits (Table ). Nevertheless, the solubilization and centrifugation process used here reduced the measureable antigenic proteins at least as effectively as treatments based on surfactant/proteolytic enzyme/centrifugation/urea …”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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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“…After that, the resulting latex was subjected to the centrifugation at 10 000 rpm at 15°C for 30 minutes . The resulting DPNR latex was subjected to the hydrogenation in the presence of palladium black as catalyst and hydrogen atmosphere at 70°C at various reaction times in order to prepare HDPNR samples containing different C═C carbon double bond contents …”

Section: Methodsmentioning

confidence: 99%

Preparation of hydrogenated natural rubber with nanomatrix structure

Nguyen

Viet

Tran

et al. 2019

Polymers for Advanced Techs

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Hydrogenated deproteinized natural rubber (HDPNR) with nanomatrix structure was prepared through graft‐copolymerization of acrylonitrile and styrene onto HDPNR particle in latex stage. Structural characterization of the resulting materials through nuclear magnetic resonance and Fourier‐transform infrared spectroscopy confirmed that acrylonitrile and styrene were grafted onto HDPNR. The weather resistance, thermal properties, mechanical properties, storage modulus, and morphology of the resulting materials were investigated in comparison with those of HDPNR. The obtained result indicated that the graft‐copolymerization of HDPNR with hydrogenation conversion of 60 mol% attained the highest grafting efficiency. Thermal resistance and storage modulus of HDPNR‐graft‐poly (styrene‐co‐acrylonitrile) (HDPNR‐g‐SAN) were superior compared with those of HDPNR and deproteinized natural rubber. This was attributed to the nanomatrix formed in HDPNR‐g‐SAN, which was confirmed through a transmission electron microscope. Ribbed smoked sheet natural rubber exhibited the outstanding mechanical properties and weather resistance when it was mixed with HDPNR‐g‐SAN.

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“…The incubation of the latex was made with 0.1 w/w% urea in the presence of 1 w/w% sodium dodecyl sulfate (SDS) at 303 K followed by centrifugation at 10,000 rpm. Cream fraction was re-dispersed in 1 w/ w% SDS to make 30 w/w% dry rubber content (DRC) latex, and it was washed twice by centrifugation to prepare deproteinized natural rubber (DPNR) latex [11,12]. The DPNR latex was diluted with distilled water to adjust 10 w/ w% DRC, and concentration of SDS was adjusted to 0.1 w/ w%.…”

Section: Experimental Sample Preparationmentioning

confidence: 99%

Frozen non-equilibrium structure for anisotropically deformed natural rubber with nanomatrix structure observed by 3D FIB-SEM and electron tomography

et al. 2015

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Abstracts Effect of frozen non-equilibrium structure for anisotropically deformed natural rubber with the nanomatrix structure on mechanical properties was investigated with respect to morphology analysis through 3D observation. Natural rubber with the nanomatrix structure was prepared by graft copolymerization of styrene onto natural rubber particles in latex stage followed by coagulation of the resulting latex. The morphology was observed by electron tomography and focused ion beam-scanning electron microscopy (FIB-SEM). The nanomatrix structure in isotropic state was precisely analyzed by electron tomography and synchrotron scattering technique. The nanomatrix structure was found to consist of natural rubber particles and polystyrene nanoparticles. The frequency-independent loss tangent at plateau region was attributed to the discontinuous nanomatrix structure. After annealing at 403 K and 7 MPa, the nanomatrix became continuous, which resulted in the increases in stress at strain of one and storage modulus as well as increase in loss tangent.

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Hyperdeproteinized natural rubber prepared with urea

Cited by 80 publications

References 17 publications

Protein influences on guayule and Hevea natural rubber sol and gel

Protein influences on guayule and Hevea natural rubber sol and gel

Preparation of hydrogenated natural rubber with nanomatrix structure

Frozen non-equilibrium structure for anisotropically deformed natural rubber with nanomatrix structure observed by 3D FIB-SEM and electron tomography

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