Effects of thermal treatment on the physicochemical characteristics of giant bamboo

CERNE

Beraldo, Antonio Ludovico¹  Brito, José Otávio²  Colla, Wandivaldi Antonio¹ 

[1] Universidade Estadual de Campinas, Campinas, Brasil$$;Universidade de São Paulo, Piracicaba, Brasil$$

关键词: Thermal treatment;    Dendrocalamus giganteus.;   

DOI  :  10.1590/S0104-77602011000300010

来源: Universidade Federal de Lavras-UFLA

【 摘 要 】

Despite countless use possibilities for bamboo, this material has two major disadvantages. One drawback is the low natural durability of most bamboo species due to presence of starch in their parenchyma cells. The other equally important drawback is the tendency bamboo has to present dimensional variations if subjected to environmental change conditions. In an attempt to minimize these inconveniences, strips (laths) of Dendrocalamus giganteus Munro were taken from different portions of the culm and subjected to several temperatures, namely 140 ºC, 180 ºC, 220 ºC, 260 ºC and 300 ºC under laboratory conditions, at the ESALQ-USP college of agriculture. The thermal treatment process was conducted in noninert and inert atmospheres (with nitrogen), depending on temperature Specimens were then subjected to physicomechanical characterization tests in order to determine optimum thermal treatment conditions in which to preserve to the extent possible the original bamboo properties. Results revealed that there is an optimum temperature range, between 140 º and 220 ºC, whereby thermally treated bamboo does not significantly lose its mechanical properties while at the same time showing greater dimensional stability in the presence of moisture.

【 授权许可】

Unknown