Parameter optimisation for diimide reduction of liquid natural rubber in hydrazine hydrate/hydrogen peroxide system using response surface methodology (RSM)

Muhammad Jefri Mohd Yusof, Nur Aidasyakirah Mohd Tahir, Fazira Firdaus, Siti Fairus Mohd Yusoff

Research output: Contribution to journalArticle

Abstract

Liquid natural rubber (LNR) derives from depolimerisation of natural rubber resulting in shorter polymeric chains and lower molecular weight of less than 105. However, LNR still exhibits weak degradation and thermal resistance of natural rubber due to the presence of carbon-carbon double bonds along its backbone. In this research, diimide reduction via oxidation of hydrazine hydrate with hydrogen peroxide was used to hydrogenate LNR to saturate its chemical structure. Hydrogenated LNR (HLNR) was characterized using Fourier-transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies. The optimization of reaction conditions was accomplished by manipulating time and temperature parameters based on response surface methodology (RSM) of 5-level-2-factor central composite rotatable design (CCRD). A significant quadratic model was generated to correlate those two parameters with R2 value of 0.9986, indicating that the model was remarkably fit with the experimental data. The results showed that hydrogenation degree of the product (HLNR) could be extended to 91.2%. Subsequently, the optimum conditions for diimide reduction of LNR were found to be at 55.9°C for 6.7 h, yielding 80.2% HLNR. This study has demonstrated the novel statistical design of experiment to hydrogenate LNR as a new starting material. The variation of hydrogenation degrees of the products has opened up more potentials for industrial and application purposes as they are composed of different percentages of saturated and saturated units.

Translated title of the contributionParameter optimisation for diimide reduction of liquid natural rubber in hydrazine hydrate/hydrogen peroxide system using response surface methodology (RSM)
Original languageMalay
Pages (from-to)2055-2061
Number of pages7
JournalSains Malaysiana
Volume47
Issue number9
DOIs
Publication statusPublished - 1 Jan 2018

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hydrazine
Rubber
Hydrogen Peroxide
Liquids
Hydrogenation
Carbon
Heat resistance

Keywords

    ASJC Scopus subject areas

    • General

    Cite this

    Pengoptimuman parameter untuk penurunan diimida getah asli cecair dalam sistem hidrazin hidrat/hidrogen peroksida menggunakan kaedah rangsangan permukaan (RSM). / Yusof, Muhammad Jefri Mohd; Tahir, Nur Aidasyakirah Mohd; Firdaus, Fazira; Mohd Yusoff, Siti Fairus.

    In: Sains Malaysiana, Vol. 47, No. 9, 01.01.2018, p. 2055-2061.

    Research output: Contribution to journalArticle

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    abstract = "Liquid natural rubber (LNR) derives from depolimerisation of natural rubber resulting in shorter polymeric chains and lower molecular weight of less than 105. However, LNR still exhibits weak degradation and thermal resistance of natural rubber due to the presence of carbon-carbon double bonds along its backbone. In this research, diimide reduction via oxidation of hydrazine hydrate with hydrogen peroxide was used to hydrogenate LNR to saturate its chemical structure. Hydrogenated LNR (HLNR) was characterized using Fourier-transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies. The optimization of reaction conditions was accomplished by manipulating time and temperature parameters based on response surface methodology (RSM) of 5-level-2-factor central composite rotatable design (CCRD). A significant quadratic model was generated to correlate those two parameters with R2 value of 0.9986, indicating that the model was remarkably fit with the experimental data. The results showed that hydrogenation degree of the product (HLNR) could be extended to 91.2{\%}. Subsequently, the optimum conditions for diimide reduction of LNR were found to be at 55.9°C for 6.7 h, yielding 80.2{\%} HLNR. This study has demonstrated the novel statistical design of experiment to hydrogenate LNR as a new starting material. The variation of hydrogenation degrees of the products has opened up more potentials for industrial and application purposes as they are composed of different percentages of saturated and saturated units.",
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    AU - Yusof, Muhammad Jefri Mohd

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    AU - Mohd Yusoff, Siti Fairus

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    AB - Liquid natural rubber (LNR) derives from depolimerisation of natural rubber resulting in shorter polymeric chains and lower molecular weight of less than 105. However, LNR still exhibits weak degradation and thermal resistance of natural rubber due to the presence of carbon-carbon double bonds along its backbone. In this research, diimide reduction via oxidation of hydrazine hydrate with hydrogen peroxide was used to hydrogenate LNR to saturate its chemical structure. Hydrogenated LNR (HLNR) was characterized using Fourier-transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies. The optimization of reaction conditions was accomplished by manipulating time and temperature parameters based on response surface methodology (RSM) of 5-level-2-factor central composite rotatable design (CCRD). A significant quadratic model was generated to correlate those two parameters with R2 value of 0.9986, indicating that the model was remarkably fit with the experimental data. The results showed that hydrogenation degree of the product (HLNR) could be extended to 91.2%. Subsequently, the optimum conditions for diimide reduction of LNR were found to be at 55.9°C for 6.7 h, yielding 80.2% HLNR. This study has demonstrated the novel statistical design of experiment to hydrogenate LNR as a new starting material. The variation of hydrogenation degrees of the products has opened up more potentials for industrial and application purposes as they are composed of different percentages of saturated and saturated units.

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