Different types of fiber were used to prepare paper .The produced paper sheets were submitted to accelerate ageing at 100°C for 72hr. It is said that 72hr. would be equal to 25 years under ambient conditions. and also we used microwave for comparison and investigate microwave effect on structure of Cellulosic fibers. Paper obtained from cotton pulp retained its original properties with time, paper obtained from bagasse and wood pulps gave a marked improvement in mechanical properties with time comparing with untreated. Mechanical properties of paper prepared from unbleached and bleached rice straw deteriorated with time comparing with untreated. In all cases whiteness affected by submitting paper sheets to accelerate ageing, but this observed clearly in case of paper sheets obtained from unbleached pulps. From scanning electron microscopy, it had been observed that, paper sheets obtained from bagasse (bleached and unbleached) and wood pulps which submitted to accelerate ageing at 100°C for 72 hr. and also by using microwave presented certain adhesion between the fibers comparing with untreated sheets. Also, from infrared spectroscopy, it had been observed that, in case of paper sheets obtained from bagasse (bleached or unbleached) and wood pulps, crystallinity index increased when paper sheets submitted to accelerate ageing comparing with untreated sheets.
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[Samar H. Mohamed, Monazah G. Khafagi, Zenat A. Nagieband M. A. El-Samahy (2014); Investigation Studies of Microwave Effect on Structure of Cellulosic Fibers Int. J. of Adv. Res. 2 (6). 0] (ISSN 2320-5407). www.journalijar.com
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