Effects of different bleaching conditions on the bending tolerance of two rattan species (Calamus merrillii Becc. and C. caesius Blume)
2009
Devera, E.E. | Razal, R.A. | Castillo, S.V.A. | Lapitan, P.G.
Following bleaching treatment under varying conditions, scraped poles of sika (Calamus caesius Blume) and palasan (C. merrillii Becc.) were tested to determine their breaking radius of curvature. Variables include bleaching agents, soaking time, and temperature using a 3x3x3 factorial in a Completely Randomized Design experiment. Bent poles that were least and most negatively affected by bleaching, along with unbleached control samples, were taken for chemical analysis and fiber measurement. Flexural properties of sika were unaffected by the different temperature levels employed while palasan was only affected by the bleaching agent used. Interactions among the three variables were found to be insignificant in sika but were highly significant in palasan. Proximate chemical analysis showed that the bending tolerance of sika and palasan poles that was most negatively affected by bleaching treatment had significantly lower holocellulose content but higher ash, hot water, and 1% NaOH soluble fractions than the control and the least affected poles'. Fiber analysis revealed that only the fiber length of palasan was affected by bleaching.
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