Polpa Celulósica De Bambu Produzida Pelo Processo Etanol/Água Para Aplicações De Reforço

Abstract

Organosolv pulping is the clean chemical process of using organic solvents to aid in the removal of lignin and hemicellulose from lignocellulosic raw materials. This method provides facility for solvent recovery at the end of the process. In this work, it was to produce bamboo cellulosic pulp by the organosolv process evaluating different temperatures and reaction times, and the pulps were analyzed aiming their future application in the reinforcement of composites. The production of bamboo pulp by the organosolv process was studied varying the cooking conditions at 1, 2 and 3 h and 150, 170 and 190 o C of temperature, in order to achieve the ideal conditions of yield, chemical and morphological characteristics of the pulp for its potential application in the reinforcement of composites. The best results for delignification (kappa number of 38), with relatively lower fiber degradation (viscosity of 625 cm 3 g-1), aspect ratio of 40.4 and the index zero-span of 204 Nm g-1 , were achieved for the pulping process at 190 o C for 2 h. These pulping conditions can be considered as the more appropriate in the range of time intervals evaluated in this work. The higher mechanical strength and the lower incidence of morphological defects in the fiber (6.0% of curls and 10.6% of kinks) can demonstrate the potential of organosolv bamboo pulp as a reinforcing element.

Macro, Micro and Nanoscale Bamboo Fiber as a Potential Reinforcement for Composites

“…The bamboo pulp was produced in a 7L stainless steel reactor by organosolv pulping process, according to [10], where, bamboo fibers were immersed in ethanol/water solution (1:1) with fibers/solvent relation of 1:10 (w/v). The work pressure was 2068 kPa at 190 o C during 2 h.…”

“…According to [10] the chemical components such as, extractives, lignin, cellulose and hemicellulose were determined, respectively, following [12,13,14].…”

Optimization of castor oil polyurethane resin content of OSB panel made of <i>Dendrocalamus asper</i> bamboo

“…The International Network for Bamboo and Rattan (INBAR) evaluated the global economy of bamboo in US$ 60 billion with a high potential for additional income for rural communities. In this context, several researchers have been studying and developing bamboo-based products as building materials (nonstructural and structural), in their natural form (full-culm) or as engineered materials such as Laminated Bamboo Lumber, Particleboards, OSB, and cement-reinforced composites (GHAVAMI; TOLEDO FILHO;BARBOSA, 1999;PAPADOPOULOS et al, 2004;GHAVAMI, 2005;MATTONE, 2005;ESPELHO;BERALDO, 2008;ARRUDA et al, 2011;RICHARD, 2012;ALMEIDA et al, 2013;GHAVAMI, 2013;CORREIA et al, 2015;SHARMA et al, 2015aSHARMA et al, , 2015bYU et al, 2015;GAUSS;KADIVAR;SAVASTANO, 2019).…”