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Understanding of photo-degradafion mechanism in nr latex with the incorporation of surface modified bi-metal oxide/Assoc.Prof. Dr Nadras Othman

Understanding of photo-degradafion mechanism in nr latex with the incorporation of surface modified bi-metal oxide_Assoc.Prof. Dr Nadras Othman

Abstract The aim of this work is to prepare I-NR using a photodegradation method, hence to characterize its physical and chemical properties. In this study, UV light was used to degrade NR in latex state. Reaction parameters such as UV radiation, temperature, hydrogen peroxide, reaction time, DRC and stabilizers showed synergistic effect and influenced the reaction's efficiency. At an optimum reaction condition, the molecular weight of NR was reduced from 544 x 103 g/mol to about 18 x 103 g/mol with almost negligible amount of gel content. The zeta potential of NR latex was increased during the photodegradation, provided by the negatively charge of fatty acid. Dispersed the Ti02 in latex showed catalytic effect on the photodegradation reaction when the molecular weight of LNR was further reduced to about 7 x 103 g/mol with negligible amount of gel content. The molecular structure of LNRs were similar to that the NR, but with increasing of hydroxyl and carbonyl groups on its chain. These functional groups were formed as a result of chain cleavage and located at the chain end.

Contributor(s): Assoc.Prof. Dr Nadras Othman - Author Language: English Subject Keywords: photodegradation ; degrade NR ; latex state First presented to the public: 7/30/2019 Original Publication Date: 9/24/2020 Previously Published By: Universiti Sains Malaysia Place Of Publication: School of Materials & Mineral Resources Engineering Citation: Extents: Number of Pages - 38 License Grantor / Date Granted:   / ( View License ) Date Deposited 2020-09-24 09:09:51.986 Submitter: Nor Hayati Ismail

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