Publicación: EXTRUSION OF FOAMED WOOD-PLASTIC COMPOSITES. PART I: PHYSICAL AND MORPHOLOGICAL CHARACTERIZATIN.
Fecha
2017
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REVISTA CHAPINGO SERIE CIENCIAS FORESTALES Y DEL AMBIENTE
Resumen
INTRODUCTION: THE USE OF WOOD-PLASTIC COMPOSITES (WPCS) HAS BEEN LIMITED DUE TO THEIR LOW IMPACT STRENGTH AND HIGH DENSITY COMPARED TO NATURAL WOOD. OBJECTIVE: TO CHARACTERIZE THE CELLULAR MORPHOLOGY AND DENSITY OF WPCS PREPARED WITH VIRGIN AND RECYCLED POLYETHYLENE, AND PINUS RADIATA WOOD. MATERIALS AND METHODS: THE POLYMER AND THE FOAMED WPCS WERE MANUFACTURED BY AN EXTRUSION PROCESS. THE VIRGIN AND RECYCLED HIGH-DENSITY POLYETHYLENE WAS MIXED SEPARATELY WITH P. RADIATA WOOD. THE PLASTIC/WOOD RATIOS WERE 80/20 AND 70/30, WITH AN ENDOTHERMIC FOAMING AGENT (HYDROCEROL 1700 AT 1 AND 3%), A COUPLING AGENT (LICOCENE 4351), AND A LUBRICATING AGENT (LICOLUB H12) ADDED. RESULTS AND DISCUSSION: THE DENSITY OF VIRGIN POLYMER, WITH 1 AND 3% FOAMING AGENT, WAS REDUCED BY 39 AND 20%, RESPECTIVELY, BUT IN THE RECYCLED POLYMER THE REDUCTION WAS 18 AND 23%, RESPECTIVELY. IN THE FOAMED WPCS, THE REDUCTION WAS LESS THAN 10%. THE FOAMED COMPOSITES HAD SMALLER BUBBLE DIAMETER AND HIGHER CELL DENSITY. THE VOID FRACTION WAS HIGHER IN THE VIRGIN POLYMER AT 3% FOAMING. CONCLUSION: THE USE OF A FOAMING AGENT GAVE BETTER PHYSICAL PROPERTIES TO THE COMPOSITES
