Papers by Keyword: Wood Flour

Abstract: This study was examined the moisture absorption property of green composite using surface treated wood flour for sustainable development goals (SDGs) of product. Constituent materials of green composite were Japanese cedar flour and poly (lactic acid). The lumber of Japanese cedar was cut by hand saw for wood flour. The surface treatment of wood flour was conducted by stone mill. The number of cycle was 400 cycles. The maximum addition amount of wood flour was 20wt%. Molding method of green composite was vacuum compressive method. The moisture absorption test of green composite was conducted by using KNO₃ solution. The maximum test time was four weeks (672 hours). The environmental temperature was room temperature. The humidity was 93%. As a result, following conclusions were obtained. In case of test time 672 hours, coefficient of moisture absorptions of green composites using non and surface treated wood flour 1.0wt.% were similar to that of poly (lactic acid). But, the coefficient of moisture absorption of green composite using surface treated Japanese cedar flour 20wt.% was larger than that of green composite using non-treated Japanese cedar flour 20wt.%. The water penetration probably occurred at interface between Japanese cedar flour and matrix. Therefore, the moisture absorption property of green composite using surface treated Japanese cedar flour 20wt% was affected by water penetration at interface between Japanese cedar flour and matrix.

Abstract: In this study, effect of wood flour addition on warm/cool feeling of green composite using wood flour and poly(lactic acid) was investigated for comfortability of interior product. Additive amounts of wood flour were 10 – 40 wt.%. Measurement of initial maximum values of heat flux of green composite using wood flour was conducted under constant temperature and humidity chamber. Surface of green composite using wood flour was observed by Scanning Electron Microscope (SEM). Following conclusions were obtained. The initial maximum value of heat flux of green composite decreased with an increase of wood flour additive amount until 20 wt.%. But, initial maximum value of heat flux of green composite at more than wood flour additive amount 30 wt.% almost did not change. From SEM observation, the appearance void area on surface of green composite at wood flour additive amount 20 wt.% was larger than that of green composite at wood flour additive amount 10 wt.%. Therefore, initial maximum value of heat flux of green composite was mainly affected because of increase of void area and wood flour until wood flour additive amount 20 wt.%.

Abstract: Highly filled bio-composites based on ethylene-vinyl acetate copolymer (EVA) with cellulose and wood flour were prepared in the previous parts of the study. The aim of this work was to dilute them with a polyethylene (PE), to prepare new bio-composites with lower EVA content and to investigate the effect of EVA/PE ratio on the mechanical properties. It was shown that melt flow index (MFI) and elongation at break increased additively with an increase of EVA content in the composition, but yield strength had an inverse tendency. The obtained results are extremely useful for choosing the right composition for the industrial implementation.

Abstract: The physic-mechanical properties of filled composites based on secondary polypropylene are investigated. As fillers the dispersed wastes of processing of agricultural plants - buckwheat and oat husk, as well as needles flour and wood flour were used. Water absorption, abrasion, impact strength and bending strength of composites were investigated. It has been proven that oat and buckwheat husks can be effectively used in composites based on secondary polypropylene and replace traditional wood fillers. It has been shown that the physic-chemical properties of the filled composites depend on the structure and physicochemical interactions on the phase separation surface, as well as on the surface properties of the filler particles. It is established that for the production of filled composites with improved physic-mechanical characteristics it is necessary to use fillers with small specific surface and concentration of surface functional groups, and the acid-base characteristic of the surface should be closer to neutral. It is shown that these conditions provide for the formation of a uniform structure of the filled composite with less internal stresses.

Abstract: There are given the results of the evaluation of the starting polymers properties and the properties of the resulting WPC. The industrial objects of WPC based on various polymers were chosen as the objects of the study. In order to analyze the structure of the WPC there was used a computer microtomography, one of the recent non-destructive methods for studying the bulk structure of composites using X-ray radiation. To assess the overall durability and behavior of the end products under actual operating conditions, tests were carried out in special artificial weather equipment (weatherometer).

Abstract: This work aimed to use magnesium hydroxide (MH) as a flame retardant in poly(lactic acid) (PLA)/high impact polystyrene (HIPS)/wood flour (WF) composite. The 80/20/20 PLA/HIPS/WF composite was melt mixed with three loadings (20, 30 and 40 phr) of MH on a twin screw extruder, followed by an injection molding. The prepared wood-plastic composites (WPCs) were investigated for their impact strength (IS), tensile strength (TS), Young’s modulus (E), elongation at break (EB), flammability and morphology. The results showed that the 80/20/20 PLA/HIPS/WF composite exhibited higher IS, TS and E than the neat PLA, but at the expense of reducing the EB. It was also found that the WPCs filled with MH at all loadings provided much higher flame resistance and E over the neat PLA, HIPS, PLA/HIPS blend and PLA/HIPS/WF composite. Therefore, the MH could play an effective role as flame retardant in the WPCs.

Abstract: The article presents the wood composite materials based on biodegradable component of polyvinyl acetate with the filler in a form of wood flour of pine trees of two types: unmodified and thermally modified pine. The sorption properties of composite of both species, namely the ability of a material to absorb moisture depending on the quantity and nature of wood filler were studied. The strength characteristics of composite materials with non-modified and modified wood fillers were investigated and revealed. The research of the loss of relative weight of both types of composite materials while standing in soil was conducted.The expediency of preliminary heat treatment of wood filler on politely if necessary some increase in biostability of the composite is found.

Abstract: In this study, the composites for wood substitution made of benzoxazine filled with rubber wood-flour were fabricated. The wood flour contents was varied from 0 to 30 wt%. The effects of gamma radiation on the thermal and mechanical properties of wood-flour filled polybenzoxazine were determined. The different radiation dose (i.e. 0, 10, 20, and 30 kGy) was applied to the fabricated samples. The differential scanning calorimeter (DSC) and thermogravimetric analyzer (TGA) were used to evaluate glass transition temperature (T_g) and degradation temperature (T_d), respectively. While the flexural strength was determined using Universal Testing Machine (UTM). It could be noted that the increase of radiation dose provided the decrease of T_d. Moreover, the values of T_g, flexural strength, and water absorption reveals the similar trend with the maximum point at 20 kGy of radiation dose.

Abstract: In this paper, solid state shear milling method was successfully employed to prepare polypropylene/wood flour composites (WPC) and their structure and performances were investigated. The experimental results showed through solid state shear milling, the aggregates of wood fiber were broken down and polymer closely adhered to wood fiber, which improved the dispersion of wood fiber and the interfacial interaction between PP and wood fiber. As a result, the performances of WPCs in this way were more excellent than that of WPCs by the conventional method. This study could provide a novel approach to resolve the problems of the dispersion, stabilization and compositing of wood flour with polymer matrix and prepare WPC with higher performances.

Abstract: The wood flour/HDPE microcellular foamed composites were prepared by means of torque rheometer. The effect of different wood flour content on mechanical properties and foamed behavior were studied. Results showed that the tensile strength and flexural strength of microcellular foamed composites first increased then decreased and the notched impact strength decreased with addition of wood flour, this was consistent with non-foamed composites. The density of composites increased and the density of foamed composites was less than non-foamed composites. With increasing wood flour content, the cell diameter of foamed composites first decreased then increased. When the content of wood flour was 40%, the cell diameter of the composites obtained the minimal value.