Sains Malaysiana 47(9)(2018): 2055–2061

http://dx.doi.org/10.17576/jsm-2018-4709-13

 

Pengoptimuman Parameter untuk Penurunan Diimida Getah Asli Cecair dalam Sistem Hidrazin Hidrat/Hidrogen Peroksida Menggunakan Kaedah Rangsangan Permukaan (RSM)

(Parameter Optimisation for Diimide Reduction of Liquid Natural Rubber in Hydrazine Hydrate/Hydrogen Peroxide System using Response Surface Methodology (RSM))

 

MUHAMMAD JEFRI MOHD YUSOF¹, NUR AIDASYAKIRAH MOHD TAHIR¹, FAZIRA FIRDAUS¹ & SITI FAIRUS M. YUSOFF^1,2*

 

¹Pusat Pengajian Sains Kimia dan Teknologi Makanan, Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

²Polymer Research Centre (PORCE), Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

Received: 27 March 2018/Accepted: 17 May 2018

 

ABSTRAK

Getah asli cecair (LNR) dihasilkan daripada proses penyahpolimeran getah asli yang menghasilkan rantaian polimer lebih pendek dan berat molekular kurang daripada 105. Namun, LNR masih mempamerkan tahap degradasi dan ketahanan termal yang rendah seperti getah asli, disebabkan oleh kehadiran ikatan karbon ganda dua pada rantaian polimer. Dalam kajian ini, penurunan diimida menggunakan pengoksidaan hidrazin hidrat dengan hidrogen peroksida dijalankan untuk menghidrogenkan unit tidak tepu LNR. LNR terhidrogen (HLNR) dicirikan menggunakan spektrometer infra-merah (FTIR) dan spektrometer resonans magnetik nuklear (NMR). Pengoptimuman parameter tindak balas dilakukan dengan memanipulasi parameter masa dan suhu tindak balas berdasarkan kaedah rangsangan permukaan (RSM) dengan 5-aras-2-faktor reka bentuk komposit putaran tengah (CCRD). Satu model kuadratik yang signifikan telah dihasilkan untuk menghubungkan dua parameter tersebut dengan nilai R² adalah 0.9986, menunjukkan bahawa model yang terhasil adalah sangat sepadan dengan data uji kaji. Keputusan kajian menunjukkan bahawa peratus penghidrogenan boleh ditingkatkan sehingga 91.2%. Seterusnya, berdasarkan RSM, parameter yang optimum bagi penurunan diimida LNR ini didapati pada suhu 55.9^oC selama 6.7 jam, menghasilkan 80.2% HLNR. Kajian ini telah menunjukkan reka bentuk uji kaji secara statistik yang novel bagi menghidrogenkan LNR. Pelbagai variasi peratus penghidrogenan produk HLNR dalam kajian ini menyumbang kepada lebih banyak aplikasi produk yang memerlukan peratusan ketepuan unit yang tertentu.

 

Kata kunci: Getah asli cecair; kaedah rangsangan permukaan (RSM); penghidrogenan; pengoptimuman; reka bentuk komposit putaran tengah (CCRD)

 

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.

 

Keywords: Central composite rotatable design (CCRD); hydrogenation; liquid natural rubber; optimization; response surface methodology (RSM)

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*Corresponding author; email: sitifairus@ukm.edu.my