Preliminary Study on Photochemical Degradation of Natural Rubber Latex

Ibrahim, Suhawati; Othman, Nadras; Nor, Zairossani Mohd; Ismail, Hanafi

doi:10.1002/masy.201600033

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…The oxidation reactions by singlet oxygen, radical-induced auto-oxidation from hydrogen peroxide, and hydroperoxide photolysis resulting from UV light led to the formation of by-products such as hydroperoxy, hydroxyl, carbonyl, and epoxide groups [63]. These results were in agreement with reports by previous researchers that the degradation of NR by an oxidizing agent and hydroxyl radical leaves carbonyl and hydroxyl groups as the end groups [26,57,64,65,66].…”

Section: Resultssupporting

confidence: 90%

“…These new small signals at the chemical shifts of 1.28, 3.47, 3.65, and 3.84 ppm could be assigned to methylene protons adjacent to the secondary alcohol, protons of the hydroxyl group, hydroxylated methane protons, and hydroxylated methylene protons, respectively [62,63]. The pattern of this spectrum was similar to that in our previous work for LNR prepared without TiO 2 [26].…”

Section: Resultssupporting

confidence: 79%

“…This may have been due to the difficulty for the reagents and UV light to penetrate the membrane of the rubber particles [24]. In a recent work, when NR latex in the presence of hydrogen peroxide was exposed to UV light at an elevated temperature, significant degradation occurred wherein the molecular weight of the NR was reduced [25,26]. The use of TiO 2 as a photocatalyst in the degradation of NR latex was also studied.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of Low-Molecular-Weight Natural Rubber Latex via Photodegradation Catalyzed by Nano TiO2

et al. 2018

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Natural rubber is one of the most important renewable biopolymers used in many applications due to its special properties that cannot be easily mimicked by synthetic polymers. To sustain the existence of natural rubber in industries, modifications have been made to its chemical structure from time to time in order to obtain new properties and to enable it to be employed in new applications. The chemical structure of natural rubber can be modified by exposure to ultraviolet light to reduce its molecular weight. Under controlled conditions, the natural rubber chains will be broken by photodegradation to yield low-molecular-weight natural rubber. The aim of this work was to obtain what is known as liquid natural rubber via photodegradation, with titanium dioxide nanocrystals as the catalyst. Titanium dioxide, which was firstly synthesized using the sol–gel method, was confirmed to be in the form of an anatase, with a size of about 10 nm. In this work, the photodegradation was carried out in latex state and yielded low-molecular-weight natural rubber latex of less than 10,000 g/mol. The presence of hydroxyl and carbonyl groups on the liquid natural rubber (LNR) chains was observed, resulting from the breaking of the chains. Scanning electron microscopy of the NR latex particles showed that titanium dioxide nanocrystals were embedded on the latex surface, but then detached during the degradation reaction.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of Low-Molecular-Weight Natural Rubber Latex via Photodegradation Catalyzed by Nano TiO2

et al. 2018

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Molecular Weight of Liquid Natural Rubber (LNR) Product from the Chemical Depolymerization Process of High Molecular Weight Narutal Rubber Latex

Bahruddin

Fadhillah

Septian

et al. 2020

J. Phys.: Conf. Ser.

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The molecular weight of natural rubber varies greatly, from only a few hundred thousand to more than one million. Liquid natural rubber (LNR) products generally use natural rubber in the form of latex with a relatively low molecular weight, which ranges from a molecular weight of 600,000 g / mol. This study aims to determine the molecular weight of LNR products made from the chemical depolymerization process of natural rubber latex with a molecular weight of more than one million. The natural rubber used latex with 20% Dry Rubber Content (KKK). The natural rubber depolymerization process used NaNO2 and H2O2 degrading agents with a CoCl2 catalyst at 80 °C. H2O2 levels were kept constant at 1 parts per hundred rubber (phr), and NaNO2 levels vary at 0; 2; 3; and 4 phr. After the reactor temperature reaches 80°C, the CoCl2 catalyst was added, which level varied at 0; 1; 3; and 5 phr. The reaction time was varied, which 7, 8, and 9 hours. The results of LNR product was purified to form a semi-gel, and molecular weight was analyzed using gel permeable chromatography (GPC). The results showed that the lowest molecular weight of the resulting LNR product was 108,335 g / mol from the initial molecular weight of 1,384,638 g / mol.

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Preliminary Study on Photochemical Degradation of Natural Rubber Latex

Cited by 2 publications

References 7 publications

Preparation and Characterization of Low-Molecular-Weight Natural Rubber Latex via Photodegradation Catalyzed by Nano TiO2

Preparation and Characterization of Low-Molecular-Weight Natural Rubber Latex via Photodegradation Catalyzed by Nano TiO2

Molecular Weight of Liquid Natural Rubber (LNR) Product from the Chemical Depolymerization Process of High Molecular Weight Narutal Rubber Latex

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