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Preparation of regenerated cellulose from rice straw lignocellulosic waste and its use for reinforced paper products, TAPPI Journal July 2021
ABSTRACT: Rice straw waste is a lignocellulosic waste produced by farmers in large quantities. In this study, regenerated cellulose (RC) from rice straw was prepared by dissolving rice straw holocellulose (HC) in NaOH/Urea/Thio-urea/Water solution by the freeze-thawing process. The crystallinity index of RC was calculated at 31%, which is out of the crystallinity range of 39%•69% that has been previously suggested.The study indicated that the RC is amorphous with a low degree of polymerization (638) and higher hydroxyl group content as compared to HC. The fiber length of RC was found to be 26.7% shorter; however, the width of RC was 21.2% higher as compared to HC. Reduced kinked fiber content was observed in the fraction of RC (18.3%) as compared with HC (39.1%), and a higher curl index of fiber was observed more so in HC (10.5%) than RC (5.6%). Because of the regeneration process, the fiber length was reduced and a fines element content of about 96% was observed in RC compared to the initial fines content of HC (56.9%). Irrespective of the high fines element content of RC, the composite paper of rice straw bleached pulp and RC fibers was developed with an increase in the tensile index from 41.4 N.m/g to 71.2 N.m/g and an increase in the burst index from 4.7 kPa.m2/g to 5.3 kPa.m2/g with the addition of 5% and 15% RC, respectively. However, enhanced tear index of paper was observed up to 5% and then it declined upon further addition of RC. The study revealed that regenerated cellulose can be used as a strength additive to overcome the shortcomings of low mechanical properties in paper products.
Magazine articles
Retention aids for highspeed paper machines, TAPPI JOURNAL, April 1999, Vol. 82(4)
Retention aids for highspeed paper machines, TAPPI JOURNAL, April 1999, Vol. 82(4)
Journal articles
Magazine articles
A novel approach to white liquor control in a continuous digester using the Box-Jenkins methodology to predict chip bulk density, TAPPI JOURNAL June 2015
A novel approach to white liquor control in a continuous digester using the Box-Jenkins methodology to predict chip bulk density, TAPPI JOURNAL June 2015
Journal articles
Magazine articles
A three-dimensional model of fine particle retention during
A three-dimensional model of fine particle retention during percolation through a fiber mat, TAPPI JOURNAL August 2015
Magazine articles
TAPPI JOURNAL November 1999; Vol. 82; No. 11 - Industry Lead
TAPPI JOURNAL November 1999; Vol. 82; No. 11 - Industry Leaders: George Glatfelter Keeps Family-led Company Focused and Committed, TAPPI JOURNAL, November 1999, Vol. 82(11)
Magazine articles
The industry: beyond 2000, TAPPI JOURNAL, October 1998, Vol.81(10)
The industry: beyond 2000, TAPPI JOURNAL, October 1998, Vol.81(10)
Magazine articles
1998 international chemical recovery conference, TAPPI JOURNAL, December 1998, Vol. 81(12)
1998 international chemical recovery conference, TAPPI JOURNAL, December 1998, Vol. 81(12)
Magazine articles
Predicting boiler emissions with neural networks, TAPPI JOURNAL, May 1997, Vol. 80(5)
Predicting boiler emissions with neural networks, TAPPI JOURNAL, May 1997, Vol. 80(5)
Magazine articles
Construction project safety planning, TAPPI JOURNAL, November 1997, Vol. 80(11)
Construction project safety planning, TAPPI JOURNAL, November 1997, Vol. 80(11)
Magazine articles
Inside ctapi, TAPPI JOURNAL, May 1996, Vol. 79(5)
Inside ctapi, TAPPI JOURNAL, May 1996, Vol. 79(5)