Woodflour as Reinforcement of Polypropylene

Caraschi, José Cláudio; Leão, Alcides Lopes

doi:10.1590/s1516-14392002000400003

Cited by 55 publications

(37 citation statements)

References 7 publications

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“…This effect has also been reported by many other workers in the current literature as the lack of interfacial adhesion and consequently inefficient load transfer from the matrix to the filler. In such cases, the filler instead of playing its reinforcement role works more likely as a stress concentrator reducing the effective yield stress of the matrix [8,[14][15][16]. Moreover, in the PP homopolymer based composites containing the maleated coupling agent, there was a significant increase on the yield stress with increasing filler content (Figure 3).…”

Section: Role Of Maleated Coupling Agents On the Interface Adhesion Omentioning

confidence: 99%

Role of Maleated Coupling Agents on the Interface Adhesion of Polypropylene—Wood Composites

Correa

Razzino

Hage

2007

Journal of Thermoplastic Composite Materials

110

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The main accomplishment of compounding wood-flour with thermoplastics is an increase in rigidity and specific strength. Filler-matrix interactions play a key role in the composite performance and the strength of the interface is determined by the nature of the coupling agents employed. The coupling efficiency of maleated polypropylene (PP-MAH) with varying MAH content and melt flow index in polypropylene-wood composites has been investigated. A method based on a simplified single rule of mixtures aiming to compare differences in interface adhesion in the presence of PP-MAH is proposed in terms of relaxation spectra of polypropylene-wood composites obtained by dynamic-mechanical thermal analysis (DMTA). The criterion is an attempt to determine an adhesion factor as derived from the relative mechanical damping (tan ) of the composite as a function of the filler content and temperature. Experimental results deviate from model predictions possibly owing to assumptions of wood-flour as a rigid filler as well as neglect of an interphase volume fraction and its damping characteristics. However, good correlations of coupling efficiency and yield properties have been found for wood composites with homopolymer and copolymer matrices within a range of varying wood-flour content and type of coupling agent. Further evidences of improved matrix-filler interactions, wettability, and filler dispersion in the presence of the PP-MAH are observed by scanning electron microscopy.

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Section: Role Of Maleated Coupling Agents On the Interface Adhesion Omentioning

confidence: 99%

Role of Maleated Coupling Agents on the Interface Adhesion of Polypropylene—Wood Composites

Correa

Razzino

Hage

2007

Journal of Thermoplastic Composite Materials

110

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“…The useful features of this composite include low moisture absorption, resistance to oxidation, resistance to diffusion and destruction by insects, low weight, high durability, high dimensional stability, desirable physical and mechanical properties, ease of cutting, and ability to apply decorative coatings. The use of wood and non-wood plant fiber as reinforcements in thermoplastics has increased dramatically in recent years (Caraschi and Leão 2002).…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanographene on Physical, Mechanical, and Thermal Properties and Morphology of Nanocomposite Made of Recycled High Density Polyethylene and Wood Flour

Beigloo¹,

Eslam²,

Hemmasi³

et al. 2017

BioResources

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The effects of the amount of nanographene on physical, mechanical, and thermal properties and morphology of the wood-plastic composites were investigated. This wood-plastic was made using recycled high density polyethylene (HDPE), nanographene, and wood flour. Four weight levels, 0, 0.5, 1.5, or 2.5 wt.% of nanographene, were combined with 70% polymeric matrix and 30% lignocellulosic material with an internal mixer. The results showed that by increasing the amount of nanographene up to 0.5% by weight, the flexural strength, flexural modulus, and notched impact strength of the composite increased. After adding 2.5 wt.% nanographene, these properties were reduced. By increasing the amount of nanographene, both the amount of residual ash and the thermal stability increased. Study of the images from scanning electron microscope (SEM) showed that the samples containing 0.5% of nanographene had less pores and were smoother than other samples.

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“…However, perhaps, larger particles act as a factor for focusing stress and creating places for primary cracks, which can easily cause composite breakage. In addition, shorter fibers (smaller particles) are higher in frequency, so they have more special levels, more homogeneous distribution, and more compatibility between the matrix and the fiber (Caraschi and Leão 2002).…”

Section: Impact Strengthmentioning

confidence: 99%

The Effect of using the Flour of Kiwi (Actinidia sp.) Twigs and Refined Fibers in the Production of Polypropylene/Wood Plastic Composites

Hosseinzadeh

2017

BioResources

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This study uses a combination of wood flour, obtained from kiwi twigs, together with refined fibers and polypropylene material to make a hybrid composite of polypropylene/wood/fiber. The materials were mixed in a twin-screw extruder, and the samples were made via an injection molding method. The tensile, flexural, and impact strengths, as well as the physical characteristics were measured based on ASTM standards. The results indicated that when the flour dimensions were reduced from 20 mesh to 40 mesh, the tensile and flexural strength, tensile and flexural modulus, and elongation at break were reduced. The notched impact strength, water absorption, and thickness swelling during 2 h and 24 h of immersion in water, and the water absorption and thickness swelling during 2 h immersion in boiling water, increased. In addition, by increasing the amount of refined fiber instead of kiwi wood flour, the tensile and flexural strength, tensile and flexural modulus, elongation at break, and the notched impact strength were increased. The water absorption and thickness swelling during 24 h of immersion in water and the water absorption and thickness swelling during 2 h immersion in boiling water were decreased.

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Woodflour as Reinforcement of Polypropylene

Cited by 55 publications

References 7 publications

Role of Maleated Coupling Agents on the Interface Adhesion of Polypropylene—Wood Composites

Role of Maleated Coupling Agents on the Interface Adhesion of Polypropylene—Wood Composites

Effect of Nanographene on Physical, Mechanical, and Thermal Properties and Morphology of Nanocomposite Made of Recycled High Density Polyethylene and Wood Flour

The Effect of using the Flour of Kiwi (Actinidia sp.) Twigs and Refined Fibers in the Production of Polypropylene/Wood Plastic Composites

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