Characterization and aging of biotreated kraft bagasse pulp

Abstract

Strains of bacteria [Pseudomonas flurescens (Pf1 and Pf2); Bacillus subtilis (B)] were used for treatment of kraft bagasse pulp. Both of the bacterial treated kraft bagasse pulp (BKBP) and control (C) pulp samples were chelated with EDTA and then bleached with hydrogen peroxide. The effect of aging on paper brightness was investigated. The brightness change due to aging for both control sample and bleached bacterial treated (BBKBP) pulp are 19.38% and (5.99%-15.35%), respectively. The crystallinity index (CrI) is calculated for both control sample (C) and BBKBP via X-ray diffraction patterns. It was found that the CrI for BBKBP was increased by 4.46% compared with the control (C) sample. The relative intensity and assignment of absorption bands for BKBP) were studied via FTIR spectra. Pyrolytic behavior of the different samples was investigated by thermal gravimetric analysis and derivative thermogravimetric techniques. Calculations of the mass loss were used to elucidate the rate constant of decomposition and the activation energy.

Polypropylene cellulose‐based composites: The effect of bagasse reinforcement and polybutadiene isocyanate treatment on the mechanical properties

“…In Iran, the production of bagasse is estimated to be around 2.5 million tones per year. Many studies have been carried out on the utilization of bagasse, such as in particleboards,20, 21 medium density fiberboard,22, 23 pulp,18, 24 and composites 25–27…”

A study of wet and dry strength properties of unaged and hygrothermally aged paper sheets reinforced with biopolymer composites

“…The specific features of cellulose, chitosan, and its derivatives were investigated using the FTIR spectra as shown in Figure . The bands at 3000–3445 cm −1 are attributed to NH 2 and OH stretching vibrations in chitosan and cellulose . The absorption band at 3445 cm −1 is higher in cellulose, chitosan, chitosan beads, and chitosan‐cellulose composite than in the corresponding crosslinked samples.…”

“…These groups are prone to further oxidation, which in combination with ongoing hydrolysis leads to the formation of small oxidized molecules among which are organic acids that in turn can promote further hydrolysis . The hydrolytic and oxidative processes are thus related to one another and precede simultaneously . In addition to cellulose, unbleached Kraft bagasse pulp contains hemicelluloses and lignin, which degrade faster and more easily than cellulose.…”

“…The bands at 3000-3445 cm 21 are attributed to ANH 2 and AOH stretching vibrations in chitosan and cellulose. 19 The absorption band at 3445 cm 21 is higher in cellulose, chitosan, chitosan beads, and chitosan-cellulose composite than in the corresponding crosslinked samples. The difference is due not only to the difference in the primary structure between the noncrosslinked and crosslinked (biopolymers and composites) but also to the occurrence of a more ordered level of packing of the macromolecules in the networks (crosslinked samples).…”

“…35 The hydrolytic and oxidative processes are thus related to one another and precede simultaneously. 19,36 In addition to cellulose, unbleached Kraft bagasse pulp contains hemicelluloses and lignin, which degrade faster and more easily than cellulose. Acidic degradation compounds from cellulose and hemicelluloses such as acetic acid, formic acid, and other short chain acids 37,38 accelerate the degradation of the unbleached paper sheets in the absence of other acidity controlling factors.…”