排序方式: 共有3条查询结果,搜索用时 421 毫秒
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Rudi Dungani Abdulwahab F. Owolabi Chaturbhuj K. Saurabh H. P. S. Abdul Khalil Paridah M. Tahir C. I. C. M. Hazwan Kamoldeen A. Ajijolakewu M. M. Masri E. Rosamah P. Aditiawati 《Journal of Polymers and the Environment》2017,25(3):692-700
The objective of this work was to isolate cellulose nanocrystal (CNC) from oil palm fronds (Elaeis guineensis) and its subsequent characterization. Isolation involves sodium hydroxide/anthraquinone pulping with mechanical refining followed by total chlorine free bleaching (includes oxygen delignification, hydrogen peroxide oxidation and peracetic acid treatment) before acid hydrolysis. Bleaching significantly decreased kappa number and increased α-cellulose percentage of fibers as confirmed by Technical Association of the Pulp and Paper Industry standards. Transmission electron microscopy (TEM), X-ray diffraction, Fourier transform infrared spectroscopy and thermogravimetric analysis revealed that acid hydrolysis along with bleaching improved crystallinity index and thermal stability of the extracted nanocrystals. It was observed that CNC maintained its cellulose 1 polymorph despite hydrolysis treatment. Mean diameter as observed by TEM and average fiber aspect ratio of obtained CNC was 7.44 ± 0.17 nm and 16.53 ± 3.52, respectively making it suitable as a reinforcing material for nanocomposite. 相似文献
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N. L. M. Suraya F. A. T. Owolabi H. P. S. Abdul Khalil Chaturbhuj K. Saurabh M. T. Paridah M. Asniza Rizal Samsul 《Journal of Polymers and the Environment》2018,26(10):4063-4072
This research work aims to investigate the synergistic effect of pozzolanic materials such as oil palm ash (OPA) and oil palm empty fruit bunch (OPEFB) on the developed hybrid polymer composites. The OPEFB and OPA fillers of different particle sizes (250, 150, and 75 µm) were mixed at OPEFB:OPA ratios of (0:100; 20:80; 40:60; 60:40; 80:20 and 100:0) and incorporated into an unsaturated polyester resin. Furthermore, both mechanical and morphological properties of the composites were analyzed and it was found that tensile, flexural, and impact properties were significantly improved at OPEFB:OPA of 75 µm particle size hybridization of the polymer. The increase of OPEFB to OPA filler ratio up to 80:20 significantly improved the tensile properties of the composites while 40:60 ratio of 75 µm gave the optimum filler ratio to obtain the highest flexural and impact properties of the composites among all studied samples. Scanning electron micrograph images showed strong particle dispersion of the embedded fillers with resin which explained the excellent mechanical strength enhancement of the composite. 相似文献
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Moundiotiya C Kulshreshtha M Bhatia AL Sisodia R 《Journal of environmental biology / Academy of Environmental Biology, India》2005,26(3):579-583
The present paper deals with the rich avifauna available at Jamwa Ramgarh Lake of Rajasthan in India. More than 100 species of birds belonging to 38 families were recorded at lake during the year 2002, maximum species were sighted during the winter season. Due to scanty rainfall in 2002, this lake was also affected and had only one-fourth of water of its total capacity, which affected the numbers of migratory waterfowl also. In the wetland most water birds were found to be migratory and few being resident. Some rare, endangered, uncommon, vulnerable, threatened and near threatened species of birds those already listed in Red Data Book were sighted. 相似文献
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