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Acda M.N.,University of the Philippines at Los Banos | Devera E.E.,University of the Philippines at Los Banos | Cabangon R.J.,University of the Philippines at Los Banos | Cabangon R.J.,Forest Products Research and Development Institute | And 2 more authors.
Journal of Tropical Forest Science | Year: 2012

ACDA MN, DEVERA EE, CABANGON RJ, PABELINA KG and RAMOS HJ. 2012. Effects of dielectric barrier discharge plasma modification on surface properties of tropical hardwoods at low pressure. The study investigated the use of dielectric barrier discharge (DBD) for surface modification of Shorea contorta (white lauan), Gmelina arborea (yemane) and Acacia mangium. Wood specimens were exposed to oxygen plasma at various intensities ranging from 5.8 to 46.5 kW-min m-2. Surface free energy was calculated based on contact angle measurements to determine thermodynamic changes on plasma modified wood. Surface characteristics were evaluated using attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy and atomic force microscopy (AFM). Results of the study showed that plasma modification resulted in significant increase in surface free energy of the three wood species investigated. ATR-FTIR indicated that plasma-treated wood had higher surface polarity compared with untreated controls. AFM 3D image showed that oxygen plasma was capable of cleaning and etching wood surface resulting in the degradation of primary and secondary cell walls. © Forest Research Institute Malaysia. Source


Acda M.N.,University of the Philippines at Los Banos | Devera E.E.,University of the Philippines at Los Banos | Cabangon R.J.,Forest Products Research and Development Institute | Ramos H.J.,University of the Philippines at Diliman
International Journal of Adhesion and Adhesives | Year: 2012

The study investigated the use of dielectric barrier discharge for surface modification to improve adhesion properties of Shorea contorta (white lauan), Gmelina arborea (yemane) and Acacia mangium. Wood specimens were exposed to oxygen plasma at intensity levels ranging from 5.8 to 46.5 kW min/m2 to improve adhesion of phenol formaldehyde, urea formaldehyde resins and polyurethane coating. Work of adhesion was calculated based on contact angle measurements to determine thermodynamic changes on plasma modified wood. Surface characteristic was evaluated using atomic force microscopy (AFM). Results of the study showed that plasma modification resulted in significant improvement in work of adhesion for the three wood species investigated. Mechanical tests of plywood and wood laminates using plasma treated S. contorta glued with phenol or urea formaldehyde resins indicated improvement in shear strength of adhesive joints. No improvement or decrease in shear strengths were observed for plasma treated G. arborea and A. mangium. Pull off strengths of polyurethane coating on plasma treated S. contorta and A. mangium specimens showed slight improvement in strength of coated film. Effects of plasma treatment on adhesion properties of wood appear to be species specific and vary with process parameters. © 2011 Elsevier Ltd. All rights reserved. Source


Manalo R.D.,University of the Philippines at Los Banos | Garcia C.M.,Forest Products Research and Development Institute
Insects | Year: 2012

The effects of thermal modification on the resistance of Dendrocalamus asper against Microcerotermes losbañosensis were investigated after exposure to virgin coconut oil at 140-200 °C for 30-120 min. The results showed that heat treatment significantly improved bamboo's resistance to termites based on mass losses and visual observations. The enhancement was highest at 200 °C. Prolonged treatment had a positive effect on the resistance at lower temperatures only. © 2012 by the authors; licensee MDPI, Basel, Switzerland. Source


Batiancela M.A.,University of the Philippines at Los Banos | Acda M.N.,University of the Philippines at Los Banos | Cabangon R.J.,Forest Products Research and Development Institute
Journal of Composite Materials | Year: 2014

The study investigated the use of waste tea (Camellia sinensis) leaves mixed in various proportions with Paraserianthes falcataria (moluccan sau) wood particles for the manufacture of particleboard. Boards containing waste tea leaves alone showed low thickness swelling and water absorption after 24 h soaking in water. Addition of P. falcataria wood particles from 20% to 50% to waste tea leaves resulted in boards with satisfactory thickness swelling, water absorption, internal bond, stiffness, and strength well above the minimum requirements for general use particleboards set by EN 312-2 (1996). Results of the study showed that waste tea leaves can be used as an alternative material either alone or in combination with wood particles for the manufacture of particleboard. © The Author(s) 2011. Source


Garcia C.M.,Forest Products Research and Development Institute | Morrell J.J.,Oregon State University
Journal of Economic Entomology | Year: 2010

Bamboo (Bambusa spp.) users in Laguna and Rizal, Philippines, were surveyed regarding their willingness to accept varying degrees of bamboo powderpost beetle, Dinoderus minutus (F.) (Coleoptera: Bostrichidae), damage. The efficacy of deltamethrin, permethrin, or disodium octaborate tetrahydrate in water or in kerosene was then assessed against beetles on freshly cut bamboo (Bambusa vulgaris Schrader ex Wendland). Adult D. minutus in groups of 100 were capable of inflicting 50% cross-sectional damage on 30-cm-long bamboo samples within a 4-wk test period. Deltamethrin (0.01% [AI]). in water or kerosene provided significantly better protection against D. minutus attack on bamboo for 5 wk than did all other treatments. The results from a survey were then used to assess the cost/benefit ratio for each prophylactic treatment. Successful prophylactic treatment provided up to a 12:1 return, illustrating the benefits of such treatments. © 2010 Entomological Society of America. Source

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