Effect of Thermomechanical Degradation of Polypropylene on Mechanical Properties of Wood-Polypropylene Composites

Najafi, Saeed Kazemi; Mostafazadeh-Marznaki, Morteza; Chaharmahali, M; Tajvidi, Mehdi

doi:10.1177/0021998309345349

Cited by 33 publications

(2 citation statements)

References 23 publications

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“…Hence, generally this kind of polymeric system has poor mechanical properties 6, 7. The properties of WPCs can be improved by optimizing the interface between the matrix and the filler, i.e., using coupling as maleated polypropylene (MAPP) 8–13. Recently, the use of a new organosilane as coupling agent for WPCs has received considerable attention due to its effectiveness in stabilizing the chemical bonds between the wood particles and several thermoplastic matrices 14–16.…”

Section: Introductionmentioning

confidence: 99%

Efficacy of hindered amines in woodflour‐polypropylene composites compatibilized with vinyltrimethoxysilane after accelerated weathering and moisture absorption

Bouza

Abad

Barral

et al. 2010

J of Applied Polymer Sci

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In this work, the aim was to analyze the efficacy of hindered amine light stabilizers (HALS) in woodflour-polypropylene composites compatibilized with vinyltrimethoxysilane after moisture absorption and accelerated weathering. Moisture uptake of materials decreased with incorporation of silane due to diminished accessibility of water molecules to reactive regions. In dynamic mechanical experiments performed on wet samples, a marked reduction in the storage modulus in the glassy and rubbery zone was observed, since water has a plasticizing effect. After sample weathering, in a xenon-arc apparatus, the changes in chemical structure and physical properties after exposure were analyzed by attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, color measurement, flexural properties, and morphological analysis by scanning electron microscopy (SEM). The data showed that HALS maintain the brightness of the materials after aging and prevent sample whitening. They also reduced color loss after aging and the SEM micrographs revealed that they inhibit surface cracking during weathering. Although a slight decline in the mechanical properties was not completely avoided, the combination of the additives studied (UV absorbers and HALS) successfully prevented the deterioration of surface materials by UV radiation.

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Section: Introductionmentioning

confidence: 99%

Efficacy of hindered amines in woodflour‐polypropylene composites compatibilized with vinyltrimethoxysilane after accelerated weathering and moisture absorption

Bouza

Abad

Barral

et al. 2010

J of Applied Polymer Sci

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“…Dodatek kompatybilizatora powodowa³ ograniczenie ch³onnooeci wody o 30-50 % oraz wzrost o 4-26 % wytrzyma³ooeci na rozci¹ganie [3]. Zale¿nooeae podstawowych w³aoeciwooeci mechanicznych kompozytów polipropylenu z m¹czk¹ drzewn¹ od dodatku PP szczepionego bezwodnikiem kwasu maleinowego (MAH-PP) oraz krotnooeci wyt³aczania przedstawiono w [4]. 1) Politechnika Krakowska, Katedra Mechaniki Dooewiadczalnej i Biomechaniki, ul.…”

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Composites based on polypropylene recyclates and natural fibers

Kuciel¹,

Liber-Kneć²,

Zajchowski³

2010

Polimery

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STANIS£AW KUCIEL 1)*) , ANETA LIBER-KNEAE 1)*) , STANIS£AW ZAJCHOWSKI 2) Kompozyty z w³óknami naturalnymi na osnowie recyklatu polipropylenu Streszczenie-Metod¹ wtryskiwania wytworzono próbki kompozytów na osnowie oryginalnego polipropylenu b¹dŸ jego recyklatu, nape³niane w³óknami juty, sizalu, konopi lub kotoniny lnianej. Oceniono wp³yw dodatku trzech ró¿nych kompatybilizatorów oraz procesu alkalizacji w³ókien na charakterystykê uzyskanych materia³ów. Zbadano podstawowe w³aoeciwooeci wytrzyma-³ooeciowe i przetwórcze oraz oznaczano ch³onnooeae wody oraz wp³yw na nie zmiennych d³ugotrwa-³ych obci¹¿eñ. Przedstawiono mo¿liwooeae zastosowania takich kompozytów. S³owa kluczowe: kompozyty, w³ókna naturalne, recyklaty, polipropylen, kompatybilizatory. COMPOSITES BASED ON POLYPROPYLENE RECYCLATES AND NATURAL FIBERS Summary-The processing by reactive extrusion method of composites based on virgin polypropylene and its recyclates filled with fibers of jute, sisal, hemp or cottonized flax has been presented (Tables 1 and 2). The influence of the addition of three different compatibilizers and fiber alkalization on the properties of the obtained materials was evaluated. The basic mechanical and process properties (Tables 3, 4, Figs. 2-13) as well as water absorption (Fig. 1) were determined and the influence of cyclic loading on them estimated. The potentials and applicability of these composites were also presented.

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Effect of oxidized polypropylene as a new compatibilizer on the water absorption and mechanical properties of wood flour–polypropylene composites

Najafi

Bahra

Abdouss

2010

J of Applied Polymer Sci

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The effect of oxidized polypropylene (OPP) as new compatibilizer on the water absorption and mechanical properties of wood flour-polypropylene (PP) composites were studied and compared with maleic anhydride grafted polypropylene (MAPP). The oxidation of PP was performed in the molten state in the presence of air. Wood flour, PP, and the compatibilizers (OPP and MAPP) were mixed in an internal mixer at temperature of 190 C. The amorphous composites removed from the mixer were then pressed into plates that had a nominal thickness of 2 mm and nominal dimensions of 15 Â 15 cm 2 with a laboratory hydraulic hot press at 190 C. Physical and mechanical tests showed that the wood flour-PP composites with OPP exhibited higher flexural and impact properties but lower water absorption than MAPP. All of the composites with 2% compatibilizers (OPP and MAPP) gave higher flexural and impact properties and lower water absorption compared to those with 4% compatibilizers.

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Effect of Thermomechanical Degradation of Polypropylene on Mechanical Properties of Wood-Polypropylene Composites

Cited by 33 publications

References 23 publications

Efficacy of hindered amines in woodflour‐polypropylene composites compatibilized with vinyltrimethoxysilane after accelerated weathering and moisture absorption

Efficacy of hindered amines in woodflour‐polypropylene composites compatibilized with vinyltrimethoxysilane after accelerated weathering and moisture absorption

Composites based on polypropylene recyclates and natural fibers

Effect of oxidized polypropylene as a new compatibilizer on the water absorption and mechanical properties of wood flour–polypropylene composites

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