Abstract
High cellulose solubility is an essential to successful production of regenerated cellulose, from which hydrogels can be produced. Additionally, some pretreatment usually facilitates cellulose solubility. Bleached cellulose pulp from kenaf core (BK), consisting of lignin (0.3%), hemicellulose (5.2%) and ash (0%), was treated with an electron beam irradiation (EBI) at 10, 30, 50 and 70 kGy. The BK and irradiated bleached cellulose pulp (IK) were then dissolved in either sodium hydroxide/urea or lithium hydroxide/urea solvents which subsequently crosslinked with epichlorohydrin (ECH) solution to stabilize the formation of regenerated cellulose hydrogels. The amount of α-cellulose component in IK samples decreased as much as 38% and caused the viscosity average molecular weight (Mv) and degree of polymerization of IK samples to be reduced significantly by 84 and 87%, respectively. This resulted in an increase in cellulose solubility (up to 30%) for the IK samples in both solvent systems. However, this treatment resulted in a reduction in the overall cellulose fibre strength. X-ray diffraction of the hydrogels showed a transformation from cellulose I to amorphous cellulose. These hydrogels exhibited a higher degree of swelling, transparency and porosity compared to hydrogels prepared from non-irradiated pulp.
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Acknowledgments
The authors thank to research project’s MRUN-2015-003, DIP 2016-004, the Ministry of Higher Education Malaysia for MyBrain15-MyPhD Scholarship for financial support and a Flinders International Research Fellowship for undertaking research at Flinders University of South Australia. Appreciation is given to the Centre for Research and Instrumentation Management (CRIM) at Universiti Kebangsaan Malaysia (UKM) and the Research Centre at Chungnam National University (CNU) of Korea, the Korea Atomic Energy Research Institute (KAERI), Flinders University of South Australia, the Malaysia Agriculture Research Development Institute (MARDI) and the Forest Research Institute of Malaysia (FRIM) for providing research materials and testing facilities. In addition, thanks are given to the CNU bio-based materials laboratory members.
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Mohammad Padzil, F.N., Gan, S., Zakaria, S. et al. Increased solubility of plant core pulp cellulose for regenerated hydrogels through electron beam irradiation. Cellulose 25, 4993–5006 (2018). https://doi.org/10.1007/s10570-018-1933-x
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DOI: https://doi.org/10.1007/s10570-018-1933-x