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mechanical properties significantly changed. Iron oxide red and black performed better than the other two pigments, and the pigments dosage of 2.28% in the composites is favourable. Keywords: wood-plastic composite; pigments; weathering; color; flex- ural property. Introduction. The use of wood fibers as fillers and reinforcer in thermoplastic industry has gained much acceptance and the resulted wood-plastic composites (wpc) grew rapidly during the past. Foundation project: This& ...

Abstract. This research concentrates on the effect of moisture absorption and UV radiation on the mechanical and physical properties of wood-plastic composites (wpc). The goal is also to evaluate the importance of wood flour fraction size on the mechanical properties of wpc and their influence on the accelerated weathering results. Wood flour reinforced composites with three different fractions of wood flour made from birch (Betula) chips were prepared.

English: This research concentrates on the effect of moisture absorption and UV radiation on the mechanical and physical properties of wood-plastic composites (wpc). The goal is also to evaluate the importance of wood flour fraction size on the mechanical properties of wpc and their influence on the accelerated weathering results. Wood flour reinforced composites with three different fractions of wood flour made from birch (Betula) chips were prepared. Additionally& ...

Also, moisture absorption of the cellulosic fibers has undesirable effects on the properties of composites (Belgacem et al. 1994). Therefore the use of composites by the construction industry has resulted in concern about the durability of these products when exposed to outdoor environments. On the one hand, the durability of wpc after ultraviolet exposure is very important (Stark and Matuana 2004). The weathering resistance of wpcs is generally less than other polymer based& ...

Colorimetry, scanning electron microscopy, Fourier transform infrared spectroscopy, mechanical test, and biodegradation in simulated soil after natural weathering were used in this research. The results showed the samples with longer exposure time to natural weathering presented significant color change, increased in carbonyl index, and wood loss on weathered wpc surfaces. Weathered wpc exhibited decreased in mechanical properties, higher mass loss after& ...

physical changes to the structure of the material components in wpc. Studies on the factors affecting on the properties of. wpc under weathering conditions have focused on various aspects, such as weathering conditions (e.g. moisture, temperature, and biological decay) [3 . 20], wood content, processing method, weathering condition, and type and content of UV absorbers and pigments [3 14]. The presence of wood has been found to accelerate the photodegradation of wpc.

Based on these, a meta-analysis using 44 empirically generated data from 12 papers in the field of accelerated weathering, thermohygric conditioning and fungal decay of wpcs was conducted. It was found that high values of modulus of rupture .... EN 15534 Part 1 contains information about which material properties need to be elaborated for wpc compounds and which synthesized test methods should be applied. EN 15534 in general represents a basic material& ...

researchers studied accelerated weathering of wpcs with combinative ultraviolet radiation and water spray. They concluded that water absorption and thickness swelling of the composites were increased after accelerated weathering (Adhikary et al. 2009). On the other hand, weathering causes wpcs lose their mechanical properties. Moisture penetration into the wpc degrades the wood-polymer interface, which in turn causes loss of strength as the stress transfer from matrix to fiber& ...

The spectral properties of the composites before and after artificial weathering under accelerated conditions were characterized by Fourier transform infrared (FTIR) spectroscopy, the surface color parameters were analyzed using colorimetry, and the mechanical properties were determined by a flexural test. weathering of wpc resulted in a surface lightening and a decrease in wood index (wood/HDPE) and flexural strength. wpcs that were reinforced with delignified& ...

Exterior wood-fiber composites like decks and rails haven't lived up to some of the early claims of long, maintenance-free life. In fact, composite decks with high wood loadings can shrink, expand, stain, warp, split, and fade much like natural wood. They can also grow mold and sprout mushrooms, be eroded by water, and eaten by termites. Who knew? Not the wood-plastic composite (wpc) manufacturers because the materials were too new on the market. Outdoor applications for& ...

Also, moisture absorption of the cellulosic fibers has undesirable effects on the properties of composites. (Belgacem et al. 1994). Therefore the use of composites by the construction industry has resulted in concern about the durability of these products when exposed to outdoor environments. On the one hand, the durability of wpc after ultraviolet exposure is very important (Stark and Matuana 2004). The weathering resistance of wpcs is generally less than other polymer based& ...

The development of a design-value for wood plastic composite (wpc) cladding is feasible and it can be derived from normative natural and accelerated weathering trials. . Material degradation of wpc is primary caused by fungi, ... According to literature reviews on wpc technology, recent research mostly focuses on single aspects of compound properties rather than on multiple attributes and the extent of their mutual interaction. Despite a growing market, wpc investigations are& ...

Hyvärinen, Marko. Ultraviolet light protection and weathering properties of wood-polypropylene composites. Lappeenranta 2014. 46 p. 6 original articles. Acta Universitatis Lappeenrantaensis. Diss. Lappeenranta University of Technology. ISBN 978-952-265-729-9, ISBN 978-952-265-730-5 (PDF). ISSN-L 1456-4491, ISSN 1456-4491. The main aim of this thesis is to study the effect of pigments on the weathering properties of wood-polypropylene composites (wpc)& ...

In recent years, Wood Plastic Composite (wpc) has found widespread applications in the field of construction, decoration and furniture. In this work, the effect of weathering on the mechanical properties of wpc made from high density polyethylene (HDPE) and rice straw particles (RS) has been studied. Different loading of composite (20, 35 and 50% RS) were tested. Polyethylene wax (PE-wax) and UV-stabilizer were also added to assess their effect on the wpc composite.

weathering is very important for assessing service life. The determination of MWD and crystallinity of PP could provide useful information to understand the contributions of plastic matrix to the wpc properties during weathering and help explain the interfacial cracks induced by moisture as observed by Stark et al. (2004). These macromolecular properties could also enhance our understanding about the plastic recycling ability. Polymer physical properties are extremely sensitive to& ...

Wood-plastic composite (wpc) lumber is promoted as a low-maintenance high- durability product [1]. However, after a decade of exterior use in the construction industry questions have resulted regarding durability. weathering is of particular concern because it has been well documented that wpcs exposed to weathering may experience color change, which affects their aesthetic appeal, as well as mechanical property loss, which limits their performance. [2-9]. weathering exposure& ...

with the change in the surface cracking and flexural properties of the composites. The PS-based wpcs also exhibited higher moisture diffusion coefficients. The mechanical behavior of. wpcs after weathering is influenced by a combination of factors, such as surface oxidation, morphology changes, and moisture absorption. Keywords: mechanical behavior; moisture diffusion coeffi- cient; photo-oxidation; polymeric matrix; weathering; wood- plastic composite (wpc).

Natural weathering. Bamboo plastic composite. Acetylation. Crystallinity. Mildew resistance. a b s t r a c t. The hydrophilic properties of lignocellulosic materials pose problems when they are used as reinforce- ment in plastics. ..... Others also found a similar increasing trend during the weathering of wpc [14,31]. This result confirms that the chain scission of the polymer matrix was independent of the degree of acetylation in bamboo during natural weathering.

Abstract. The effects of weathering on the surface properties of wood-plastic composites (wpc) were examined. High-density polyethylene (HDPE) based wpcs made from modified wood flour (untreated, extractives free, and holocellulose (delignified) fibers) were subjected to accelerated (xenon-arc) weathering. Colorimetery and Fourier-transform infrared spectroscopy were employed to monitor the color change and surface chemistries of the weathered wpc surface. The com.

(White Bear Lake, Minn.) evaluated a Korean manufacturer's wpc deck board with the aid of xenon arc accelerated weathering chambers supplied by ATLAS Material Testing Solutions (Chicago, Ill.). ... For this group of samples, degradation of the wpc's structural properties was not a concern but, because its initial antioxidant filler content was very low, Aspen's model predicted that within five years, surface crumbling would be observed. This outcome was consistent with accelerated& ...

tubes (CNTs), and carbon fibers (CFs) on the mechan- ical properties, wettability, and flammability of polypropylene (PP)-based co-extruded wpc.24,25 The main objective of the present study was to determine the effect of these fillers on the durability of the com- posite, including tensile properties and color change after xenon-arc lamp weathering, and the change of tensile properties after an FT cycling test. Experimental. Materials. A PP, Eltex P HY001P (Ineos), density 0.910 g/cm3& ...

2017年3月12日 ... 材(混練型 wpc)の性能と技術動向 . 木材工業 ,. 67, 50-55. 小林 正彦 , 木口 実 , 片岡 厚 , 石川 敦子 , 川. 元スミレ , 松永 正弘 (2014) 混練型 wpc の耐候. 性に及ぼす加溶媒分解木材の添加効果 . 木材保存、. 40(1), 8-16. Lee C.H., Hung K.C., Chen Y.L., Wu T.L., Chien Y.C., Wu. J.H (2012) Effects of polymeric matrix on accelerated. UV weathering properties of wood-plastic composites. Holzforschung, 66, 981-987. Muasher M., Sain M. (2006) The efficacy of photostabilizers.

This dissertation “PHOTODEGRADATION AND PHOTOSTABILIZATION OF. WEATHERED WOOD FLOUR FILLED POLYETHYLENE COMPOSITES”, is hereby approved as partial fulfillment of the requirements for the degree of Doctor of Philosophy in Forest Science. School of Forestry Resources & Environmental Science& ...

flexural properties of the composites after several weathering periods were determined and compared. ... Combination of HALS and UVA did not produce a synergistic effect to protect HDPE/WF composite from undergoing some changes in the properties as a result of natural weathering. Keywords: wood-plastic composites, natural weathering, photo-stabilizers, flexural properties ... The use of wpc as building products has resulted in concern about the durability of these products& ...

Wood-plastic composite (wpc) has environmental and economical advantages and has been extensively applied and studied. weathering causes negative changes in the surface appearance, mechanical properties and surface chemical properties of the wpc products. Thus, to explore the weathering mechanism of wpc, improve its durability and provide some data and guide for wpc production, the natural weathering performance of bamboo& ...

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