tailieunhanh - Extraction of microcrystalline cellulose from cotton fiber, and application to block natural rubber as reinforcing agent

This paper reports on the extraction of microcrystal cellulose from cotton fiber and their application as a reinforcing agent in NR matrix. Microcrystalline cellulose was also grafted with maleic anhydride (MA) so that grafted one can improve interfacial interaction between cellulose and natural rubber. Fillers were incorporated to block natural rubber by two-roll mill dry mixing. | Cite this paper Vietnam J. Chem. 2023 61 S2 73-80 Research Article DOI Extraction of microcrystalline cellulose from cotton fiber and application to block natural rubber as reinforcing agent Nguyen Ngoc An Pham Thi Le Chi Faculty of Chemistry University of Science Vietnam National University Ho Chi Minh City 227 Nguyen Van Cu Street District 5 Ho Chi Minh City 70000 Viet Nam Submitted February 19 2023 Revised April 9 2023 Accepted June 26 2023 Abstract Crosslinked natural rubber NR microcrystalline cellulose MCC composite was prepared by dry mixing of NR with MCC extracted from cotton fiber. MCC was first extracted from cotton fiber by acid hydrolysis processing then applied to block natural rubber as a reinforcement. MCC grafted maleic anhydride MA was also synthesized and applied to the composites to improve the compatibility between natural rubber and cellulose. Obtained cellulose samples were subjected to infrared spectroscopy FTIR to confirm the purity of cellulose structure and the presence of MA grafted on MCC chains. X-ray spectroscopy XRD and thermogravimetric analysis TGA were investigated as well to see if there was any important change after modification. NR containing microcrystalline cellulose was formulated with vulcanizing agents and microcrystalline cellulose grafted MA for characterization. Micro-scale dispersion of microcrystalline cellulose was observed by scanning electron microscopy SEM . MCC showed positive contributions to tensile strength and thermal properties of composites as well. Mechanical properties of vulcanized rubber containing microcrystalline cellulose grafted MA gave a slightly better value compared to the reference sample without adding the compatible agent. The presence of reinforcements helped NR composites to reduce solvent uptake however there was no change in tensile strength after aging test. Keywords. Natural rubber microcellulosse composite microcellulose grafted MA. 1. INTRODUCTION looking for .