POLPAÇÃO KRAFT E KRAFT/AQ DA MADEIRA PRÉ-HIDROLISADA DE &lt;i&gt;Eucalyptus urograndis&lt;/i&gt;

Santos, Rafael dos; Júnior, Julio Antonio de Mello; Caraschi, José Cláudio; Ventorim, Gustavo; Pereira, Felipo Augusto

doi:10.5902/1980509825148

Cited by 5 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The α-cellulose content (40.65% ± 2.12) was close to that obtained by Silva (2018) of 38.54% and lower than that obtained by Santos, Mello Júnior, Caraschi, Ventorim and Pereira (2016) for hybrids of Eucalyptus urophylla x Eucalyptus grandis (51.95%) and Trugilho et al (2015) studying the same species (51.60% to 60.76%). The content of α-cellulose refers to cellulose that is intact, being important for the production of cellulose pulp.…”

Section: Chemical Compositionsupporting

confidence: 83%

Cellulose acetate obtained from Schizolobium parahyba (vell.) blake wood

Allesi

Silva

Pádua

et al. 2021

RSD

View full text Add to dashboard Cite

Currently, non-biodegradable polymers are produced on a large scale and cause several environmental problems, especially due to their low degradation. Cellulose acetate is a non-toxic, low-flammable and low-cost polymer, playing an important environmental role. The objective of this study was to synthesize cellulose acetate membranes from Schizolobium parahyba wood (“guapuruvu”) with particles sizes of 20 and 60 mesh. The materials were submitted to acetosolv pulping, bleaching and acetylation to produce the acetates. The yields and the degree of substitution were found. The fibers were chemically characterized and the samples obtained at each processing step were analyzed by FTIR. It was possible to prepare acetates from both granulometries wood. The FTIR analysis showed changes on the samples’ bands, indicating that the chemical processes were efficient. Cellulose acetate obtained from the 60 mesh material presented a higher degree of substitution (2.74 ± 0.12) when compared to the 20 mesh acetate (2.59 ± 0.13), showing that the particle size of the material influenced on the efficiency of the acetylation reaction. DMA tests have demonstrated that the 60 mesh membrane has higher flexibility and transparency when compared to the 20 mesh membrane.

show abstract

Section: Chemical Compositionsupporting

confidence: 83%

Cellulose acetate obtained from Schizolobium parahyba (vell.) blake wood

Allesi

Silva

Pádua

et al. 2021

RSD

View full text Add to dashboard Cite

show abstract

“…The same situation was also experienced in Sumatra and Kalimantan, Indonesia, which switched from planting A. mangium to E. pellita [2,3]. Eucalyptus is an alternative tree species to A. mangium due to their fast growth, short rotation time, suitability of wood properties to many products, huge variability, high productivity, suitability to vegetative propagation [4] and high density value [5].…”

Section: Introductionmentioning

confidence: 97%

Influence of Chrysoporthe deuterocubensis Canker Disease on the Physical and Mechanical Properties of Eucalyptus urograndis

Dahali

Tahir

Roseley

et al. 2021

Forests

View full text Add to dashboard Cite

Eucalyptus hybrid has been planted rigorously in wet tropical regions including Malaysia. Recently, there was a report on the occurrence of stem canker on these trees. However, the extent of the infections by this stem canker is unknown. The aim of this study was to evaluate the influence of stem canker disease, Chrysoporthe deuterocubensis, on the physical and mechanical properties of 11-year-old E. urophylla × E. grandis or also known as E. urograndis. The samples were taken from infected and healthy trees that were segregated into different classes based on the severity of the attack, i.e., healthy (class 1), moderately infected (class 2), severely infected (class 3) and very severely infected (class 4). A total of 1440 samples from four infection classes were used in this study. The physical and mechanical properties were determined according to the standard test procedures specified by the International Organization for Standardization (ISO) 13061:2014 (Parts 1 to 4, 13, 14 and 17) and British Standard (BS 373: 1957). From the result, a significant effect by the infection classes was observed on physical and mechanical properties of E. urograndis. All infected wood experienced less shrinkage compared to that of a healthy one, particularly the volumetric (Volsh) and radial shrinkage (Rsh). Wood from class 2 and class 3 was less affected by the infection while the majority of wood from class 4 had significantly lower density and poorer strength. Based on the strength data, wood from infection class 2 can be considered to be used for non-structural applications such as furniture, interior finishing, window frames and doors since reduction in mechanical properties was observed. Wood from class 3 would need further investigation to examine its suitability for structural applications.

show abstract

“…The widespread use of Eucalyptus grandis x Eucalyptus urophylla hybrids in forest plantation is related to their fast growth, decreased cutting cycle, water deficit resistance, high-density value, and pulp yield from 50% to 54% (Santos et al, 2016).However, under controlled conditions of production, trees tend to interact with other environmental factors by an unknown mechanism resulting in either physiological or abiotic disorder (Schutzki;Cregg, 2007). According to these authors, physiological disorders occur as a response to climatic, edaphic, nutritional, agriculture factors, and in some cases genetic predisposition in a plant.…”

Section: Introductionmentioning

confidence: 99%