PhD STUDENT, UNIVERSITY OF MALAYA
The researc focus on manufacturing and preaparing the more stable rubber composites
There are few problems and limitation when using nano crystalline cellulose (NCC) as a reinforcement material in polymer matrix. The problem incorporated with natural property exhibited in both of two different materials of NCC (that has hydrophilic properties) and rubber polymer (that has hydrophobic properties). Higher hydroxyl groups in NCC tend this material to agglomerate and reduce the dispersibility performance in solution. This will be a major problem when to obtain a homogenous mixture with matrix. NCC has difficulty to disperse in non-polar medium, because of their polar surface, incorporation of NCC as a reinforcement material has so far limited to aqueous or polar environments. The dispersibility problem led to compability between hydrophilic filler (NCC) and hydrophobic polymer matrix (NBR), thus limit the performance of product manufactured. Modification of NCC hydrophilic properties has been found as a choice in produce homogenous mixture of composite product. The presence of hydroxyl groups in NCC or mainly on cellulose material restricts its homogenous dispersion in NBR aqueous solution. The hydroxyl groups will initiate to form agglomeration or entanglement. A surface modification is another strategy to overcome this problem, where the hydroxyl group is partially replaced by other functional group. In this study, the surface modification will be done using acetylation solution. The hydroxyl group as exhibited on NCC surface will be substituted by acetyl group in this treatment. The present of acetyl group will promote dispersibility in NBR matrix when mixed together. The objectives of this study is to to produce hydrophobic NCC as a filler material in NBR polymer thus promote more homogenous mixture in NBR
Abstract: A method is proposed for processing of experimental data which would allow adequately describing the rheological behavior of systems whose disperse phase contains swelling particles of anisometric shape. Polysaccharide films with a high degree of swelling were obtained from dispersions of powdered cellulose in chitosan solutions. The high sorption capacity of the films, good adhesion to skin, lack of toxicity, and possibility of immobilizing drugs in them allow considering these films as promising materials for healing wounds and burns.
Pub.: 01 Nov '00, Pinned: 25 Aug '17
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