Preparation and graft‐copolymerization of hydrogenated natural rubber in latex stage

Hà, Nguyễn Thu; Kaneda, Keisuke; Naitoh, Yoshitaka; Fukuhara, Lina; Kosugi, Ken’ichirou; Kawahara, Seiichi

doi:10.1002/app.42435

Cited by 8 publications

(5 citation statements)

References 22 publications

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“…The preparation of deproteinized natural rubber (DPNR) latex was carried out by the incubation of NR latex with 0.1 w/w% urea and 1 w/w% SDS for 1 hour. 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%

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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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Section: Methodsmentioning

confidence: 99%

“…After that, the resulting latex was subjected to the centrifugation at 10 000 rpm at 15°C for 30 minutes. 14…”

Section: Preparation Of Hdpnr-g-sanmentioning

confidence: 99%

Preparation of hydrogenated natural rubber with nanomatrix structure

Nguyen

Viet

Tran

et al. 2019

Polymers for Advanced Techs

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“…Hydrogenation can be employed to enhance the quality of natural rubber (Saengdee, Phinyocheep, and Daniel, 2020;Phinyocheep, 2014;Winters et al, 2002). In this process, solid natural rubber is dissolved in a solvent and then reacted with hydrogen gas, with the help of a catalyst (Ha et al, 2016;Ha et al, 2015;Mahittikul, Prasassarakich, Rempel, 2009;Inoue and Nishio, 2007). Notably, this process demands the use of organic solvents and containers capable of withstanding high pressure, necessitating strict safety precautions.…”

Section: Introductionmentioning

confidence: 99%

Study of Solvent and Catalyst in Diimide Biphasic Hydrogenation System of Natural Rubber

Winarto,

Liza,

Fathurrohman

et al. 2024

IJTech

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In Indonesia, solid rubber is the most common form of natural rubber (NR) intermediates because it is easy to store and transport. However, hydrogenation, a process aimed at improving the quality of NR by addressing its vulnerability to environmental factors due to the presence of carbon double bonds, is typically carried out under relatively mild conditions using latex material. This study explores a biphasic hydrogenation approach using solid NR dissolved in a solvent and a hydrogen source (hydrazine hydrate and hydrogen peroxide) mixed in water. The choice of solvents, catalysts, and the water-to-solvent volume ratio were examined for their impact on hydrogenation. Characterization was conducted using Fourier Transform Infrared (FTIR) spectroscopy as a qualitative indicator of hydrogenation. Meanwhile, Nuclear Magnetic Resonance 1 H-NMR spectroscopy is used to measure the degree of hydrogenation. The results indicate that partial hydrogenation was successful using toluene as a solvent and ethylene diamine tetra acetic acid diammonium copper (Cu-EDTA) as a catalyst, with variations in water volume influencing the degree of hydrogenation. A degree of hydrogenation of 7.69% was achieved using 15 mL of water. The thermal properties of hydrogenated NR remain comparable to the original material, with improved heat resistance. This biphasic hydrogenation method offers the potential to enhance the properties of NR in various applications.

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“…During the long-term storage of NRL, the protein and phospholipid in the terminal chain can promote the network formation of NRL through the protein-protein interaction at the ω-terminus or the phospholipidphospholipid interaction at the α-terminus, leading to storage hardening [14][15][16][17][18]. Surfactants and other chemicals are added to the NRL during the graft modi cation process [19][20][21][22], the properties of the modi ed natural rubber latex may change during storage due to bacteria, enzymes and temperature changes [23]. Therefore, the colloidal properties and emulsion properties of the modi ed natural rubber latex during storage have been widely concerned.…”

Section: Introductionmentioning

confidence: 99%

Study on the storage performance of MG30/NRL co-blended latexes

et al. 2023

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Modifying natural rubber latex (NRL) and blending it with NRL can improve NRL performance and expand application elds. The performance of co-blended latex will change due to changes in non-rubber components during storage. Therefore, it is important to study the change of properties during the storage of co-blended latexes. In this paper, 30% methyl methacrylate grafted natural rubber (MG30) was synthesized by cumene hydroperoxide/ tetraethylenepentamine (CHPO/TEPA) initiating system, MG30 and NRL were mixed in different proportions to study the morphology and physical and mechanical properties, and the colloidal properties and emulsion properties of co-blended latexes were studied during storage. The results showed that the mechanical stability of NRL and co-blended latexes were high and the viscosity gradually increased during storage. The study of the vulcanization characteristics of the coblended latexes lms and the physical and mechanical properties of the vulcanized latex lms showed that the vulcanization time of the co-blended lms increased and the torque value increased in comparison to NRL. With the increase of MG30 content, the tensile strength and tear strength of the coblended latexes vulcanized lms showed a trend of increasing and then decreasing, and the co-blended lm with 10% MG30 showed the best mechanical properties.

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Preparation and graft‐copolymerization of hydrogenated natural rubber in latex stage

Cited by 8 publications

References 22 publications

Preparation of hydrogenated natural rubber with nanomatrix structure

Preparation of hydrogenated natural rubber with nanomatrix structure

Study of Solvent and Catalyst in Diimide Biphasic Hydrogenation System of Natural Rubber

Study on the storage performance of MG30/NRL co-blended latexes

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