Sains Malaysiana 46(5)(2017): 795–801

http://dx.doi.org/10.17576/jsm-2017-4605-14

 

Membran Selulosa Kenaf Terjana Semula daripada Larutan Akues NaOH/Urea yang Digumpal Menggunakan Asid Sulfurik

(Regenerated Kenaf Cellulose Membrane from NaOH/Urea Aqueous Solution by Coagulating with Sulphuric Acid)

 

NOR AZIAWATI AZAHARI1, SARANI ZAKARIA1*, HATIKA KACO1, GAN SIN YEE1, CHIN HUA CHIA1, SHARIFAH NABIHAH SYED JAAFAR1 & MOHD SHAIFUL SAJAB2

 

1Makmal Biosumber dan Biopenurasan, Pusat Pengajian Fizik Gunaan, Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

2Pusat Penyelidikan Teknologi Proses Mampan (CESPRO), Fakulti Kejuruteraan dan Alam Bina

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

Received: 18 August 2016/Accepted: 4 October 2016

 

ABSTRAK

Membran selulosa terjana semula (MS) daripada pulpa teras kenaf telah berjaya dihasilkan menggunakan kaedah pra penyejukan dan digumpal menggunakan larutan asid sulfurik. MS disediakan daripada pelarutan selulosa kenaf dalam larutan akues NaOH/urea dan larutan selulosa seterusnya digumpal dengan H2SO4 pada kepekatan 5-12 peratus berat (% bt.) selama 1-10 min. Pengaruh kepekatan penggumpal H2SO4 dan masa penggumpalan ke atas struktur, saiz liang, sifat mekanik dan ketelusan cahaya MS telah dikaji menggunakan pembelauan sinar-X (XRD), imbasan mikroskop elektron tekanan boleh ubah (VPSEM), penguji regangan dan spektrofotometer ultra-violet sinar tampak (UV-vis). Keputusan VPSEM menunjukkan perubahan saiz liang membran bergantung kepada kepekatan larutan penggumpal H2SO4, manakala masa penggumpalan tidak mempengaruhi saiz liang membran. Membran yang direndam dengan larutan penggumpal pada kepekatan 10 % bt. dan masa pembekuan yang sederhana iaitu 5 min menunjukkan sifat mekanik yang lebih baik dengan nilai kekuatan regangan masing-masing 41.9 dan 43.5 MPa. Oleh itu, kajian ini dapat memberikan maklumat mengenai penyediaan MS dengan pelbagai saiz liang dan sifat mekanik dengan pengubahsuaian kepekatan dan masa penggumpalan.

 

Kata kunci: Larutan akues NaOH/urea; membran selulosa terjana semula; penggumpal; pulpa teras kenaf; sifat fizikal

 

ABSTRACT

Regenerated cellulose membranes (RC) from kenaf core pulp have been produced using the pre cool method and coagulated using sulfuric acid (H2SO4) solution. RC prepared from kenaf cellulose was dissolved in NaOH/urea solvent and subsequently coagulated with H2SO4 solution at concentration 5-12 wt. % for 1 - 10 min. The effects of concentration of acid and coagulating time on the structure, pore size, mechanical properties and transparency of RC were studied using X-ray diffraction (XRD), variable pressure scanning electron microscopy (VPSEM), tensile tester and spectrometer ultra violet (UV- Vis) transmission, respectively. The results from VPSEM showed the pore size of the membranes changed as a function of the concentration of H2SO4 coagulant, whereas it was hardly changed with coagulation time. RC membranes coagulated in 10 wt. % concentration of H2SO4 solution and 5 min coagulation time exhibited better mechanical properties with tensile strength value 41.9 and 43.5 MPa, respectively. Thus, this work provided an optimal coagulation condition for preparing RC membranes in the solvent system and scientific information for controlling the properties and pore sizes of the membranes.

 

Keywords: Coagulant; kenaf core pulp; NaOH/urea aqueous solution; physical properties; regenerated cellulose membrane

REFERENCES

Biganska, O. & Navard, P. 2009. Morphology of cellulose objects regenerated from cellulose-N-methylmorpholine N-oxide-water solutions. Cellulose 16(2): 179-188.

Chen, X., Burger, C., Fang, D., Ruan, D., Zhang, L., Hsiao, B.S. & Chu, B. 2006. X-ray studies of regenrated cellulose fiber wet spun from cotton linter pulp in NaOH/thiourea aqueous solutions. Polymer 47: 2839-2848.

Fink, H.P., Weigel, P., Purz, H.J. & Ganster, J. 2001. Structure formation of regenerated cellulose materials from Nmmo-solutions. Progress in Polymer Science 26(1473-1524.

Fitzpatrick, M., Champagne, P. & Cunningham, M.F. 2012. The effect of subcritical carbon dioxide on the dissolution of cellulose in the ionic liquid 1-ethy-3-methylimidazolium acetate. Cellulose 19(1): 37-44.

French, A.D. & Santiago Cintron, M. 2013. Cellulose polymorphy, crystallite size and the Segal crystallinity index. Cellulose 20(1): 583-588.

Gan, S., Zakaria, S., Chia, C.H., Chen, R.S. & Jeyalaldeen, N. 2015a. Physico-mechanical properties of a microwave-irradiated kenaf carbamate/graphene oxide membrane. Cellulose 22(6): 3851-3863.

Gan, S., Zakaria, S., Chia, C.H., Padzil, F.N. & Ng, P. 2015b. Effect of hydrothermal pretreatment on solubility and formation of kenaf cellulose membrane and hydrogel. Carbohydrates Polymer 115: 62-68.

Gao, S., Wang, J. & Jin, Z. 2012. Preparation of cellulose film from solution of bacterial cellulose in Nmmo. Carbohydrates Polymer 87(2): 1020-1025.

Hameed, N. & Guo, Q. 2010. Blend films of natural wool and cellulose prepared from an ionic liquid. Cellulose 17(4): 803-813.

Kaco, H., Zakaria, S., Chia, C.H., Sajab, M.S. & Mohd Saidi, A.S. 2015. Characterization of aldehyde crosslinked kenaf regenerated cellulose film. Bioresources 10(4): 6705-6719.

Kaco, H., Zakaria, S., Razali, N.F., Chia, C.H., Zhang, L. & Mohamad Jani, S. 2014. Properties of cellulose hydrogel from kenaf core prepared via pre cooled dissolving method. Sains Malaysiana 43(8): 1221-1229.

Klemm, D., Heubletin, B., Fink, H.P. & Bohn, A. 2005. Cellulose: Fascinating biopolymer and sustainable raw material. Angew. Chem. Int. Ed. 44(22): 3358-3393.

Liu, S. & Zhang, L. 2008. Effects of polymer concentration and coagulation temperature on the properties of regenerated cellulose films prepared from Lioh/urea solution. Cellulose 16(2): 189-198.

Mao, Y., Zhou, J., Cai, J. & Zhang, L. 2006. Effects of coagulants on porous structure of membranes prepared from cellulose in NaOH/urea aqueous solution. Journal of Membrane Science 279: 246-255.

Mohd Said, A.S., Zakaria, S., Chan, C.H., Syed Jaafar, S.N. & Padzil, F.N. 2016. Physico-mechanical properties of kenaf pulp cellulose membrane cross-linked with glyoxal. Sains Malaysiana 45(2): 263-270.

Padzil, F. N., Zakaria, S., Chia, C. H., Jaafar, S. N., Kaco, H., Gan, S. & Ng, P. 2015. Effect of acid hydrolysis on regenerated kenaf core membrane produced using aqueous alkaline-urea systems. Carbohydrates Polymer 124: 164-171.

Rosenau, T., Potthast, A., Adorjan, I., Hofinger, A., Sixta, H., Firgo, H. & Kosma, P. 2002. Cellulosa solutions in n-methylmorpholine-N-oxide (Nmmo)-degradation processes and stabilizers. Cellulose 9(3-4): 283-291.

Swatloski, R.P., Spear, S.K., Holbery, J.D. & Rogers, R.D. 2002. Dissolution of cellulose with ionic liquids. Journal of the American Chemical Society 124(18): 4974-4975.

Wang, H., Gurau, G. & Rogers, R.D. 2012. Ionic liquid processing of cellulose. Chemical Society Reviews 41(4): 1519-1537.

Xu, A., Wang, J. & Wang, H. 2010. Effect of anionic structure and lithium salts addition on the dissolution of cellulose in 1-Butyl-3-methylimidazolium-based ionic liquid solvent systems. Green Chemistry 12(2): 268-275.

Zakaria, S., Chia, C.H., Ahmad, W.H., Kaco, H., Chook, S.W. & Chan, C.H. 2015. Mechanical and antibacterial properties of paper coated with chitosan. Sains Malaysiana 44(6): 905-911.

Zhang, L., Mao, Y., Zhou, J. & Cai, J. 2005. Effects of coagulation conditions on the properties of regenerated cellulose films prepared in Naoh/urea aqueous solution. Industrial & Engineering Chemistry Research 4(3): 522-529.

Zhang, S., Li, F.Z., Yu, J.Y. & Hsieh, Y.L. 2010. Dissolution behaviour and solubility of cellulose in NaOH complex solution. Carbohydrate Polymer 81: 668-674.

Zhou, J., Zhang, L., Cai, J. & Shu, H. 2002. Cellulose microporous membranes prepared from Naoh/aqueous solution. Journal of Membrane Science 210(77-90).

 

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

 

 

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