Wood polypropylene composites prepared by thermally modified fibers at two extrusion speeds: mechanical and viscoelastic properties

Holzforschung ◽  
2015 ◽  
Vol 69 (3) ◽  
pp. 313-319 ◽  
Author(s):  
Haroutioun Askanian ◽  
Vincent Verney ◽  
Sophie Commereuc ◽  
René Guyonnet ◽  
Valérie Massardier
Keyword(s):  
Viscoelastic Behavior ◽  
Tensile Modulus ◽  
Young Modulus ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Screw Extruder ◽  
Elongation At Break ◽  
Polypropylene Composites ◽  
Twin Screw ◽  
Composites Processing

Abstract Composites have been prepared with polypropylene (PP) as a matrix and pine flours, either thermally treated (Wtr) or not (W), as fillers resulting in wood plastic composites (WPCs). The treatment by retification at 280° mainly elevates the hydrophobicity of wood. The WPCs were fabricated with a co-rotating twin-screw extruder with the screw speeds of 500 and 1200 rpm and specimens were prepared by injection molding. Viscoelastic behavior, tensile test and Charpy impact test of Wtr PC were compared with PP and WPC. Wtr PC has a better dispersion and highest tensile modulus. As expected, a decrease in elongation at break and impact strength was observed for all composites. Processing at 1200 rpm improved by 60% the Young modulus of the WPC compared to 500 rpm, whereas 500 rpm was enough to obtain the highest modulus for Wtr PC.

Mechanical Properties of PLA/LLDPE Films Reinforced with Silica from Rice Husk

2014 ◽  
Vol 1025-1026 ◽  
pp. 221-226 ◽  
Author(s):  
Supavinee Sareeladdanon ◽  
Pranut Potiyaraj
Keyword(s):  
Mechanical Properties ◽  
Rice Husk ◽  
Tensile Testing ◽  
Tensile Modulus ◽  
Screw Extruder ◽  
Melt Mixing ◽  
Elongation At Break ◽  
Rice Husk Silica ◽  
Result Show ◽  
Twin Screw

Nanocomposite is one of the most favorable approaches to improve mechanical properties of polymers. This study prepared polymer composite of PLA and LLDPE with different amount of rice husk silica (0.5 and 1 wt%). The composites were prepared by melt-mixing in a twin-screw extruder and processed into film by a chill roll cast extruder. The mechanical properties were investigated through tensile testing and tear testing. The result show that the tensile modulus of PLA decreased with 1wt% rice husk silica. Similarly, tensile modulus of LLDPE dropped with the addition of silica. However, with the addition 0.5 and 1 wt% rice husk silica, the elongation at break of PLA and LLDPE composites increases significantly.

scholarly journals Preparation of Biodegradable Materials by Reactive Extrusion

2008 ◽  
Vol 587-588 ◽  
pp. 520-524 ◽  
Author(s):  
Isabel Moura ◽  
Ana Vera Machado ◽  
Fernando M. Duarte ◽  
Gabriela Botelho ◽  
Regina Nogueira
Keyword(s):  
Mechanical Properties ◽  
High Density Polyethylene ◽  
Young Modulus ◽  
Polymeric Materials ◽  
Reactive Extrusion ◽  
Biodegradable Materials ◽  
Screw Extruder ◽  
Elongation At Break ◽  
Twin Screw ◽  
Poly Caprolactone

This work aimed to prepare biodegradable polymeric materials based on blends of a synthetic high density polyethylene (HDPE) and biodegradable polymers such as polylactic acid (PCL) and poly(caprolactone) (PLA), in a co-rotating twin-screw extruder. A polyethylene modified with maleic anhydride was used as compatibiliser. The mechanical results showed that the addition of PLA improves the blends stiffness while the addition of PCL leads to materials with a greater elongation at break and a lower Young modulus. This feature is related with the mechanical properties of each material as well as the adhesion between them. Concerning the biodegradability tests, it was found that HDPE/PCL blend presents the highest degree of biodegradability.

Morphology, mechanical, and crystallization behaviors of micro- and nano-ZnO filled polypropylene composites

2012 ◽  
Vol 31 (5) ◽  
pp. 323-329 ◽  
Author(s):  
Haydar U. Zaman ◽  
Park Deuk Hun ◽  
Ruhul A. Khan ◽  
Keun-Byoung Yoon
Keyword(s):  
Tensile Strength ◽  
Interfacial Adhesion ◽  
Tensile Modulus ◽  
Tensile Tests ◽  
Interfacial Interaction ◽  
Screw Extruder ◽  
Polypropylene Composites ◽  
Crystallization Behaviors ◽  
The Matrix ◽  
Twin Screw

The aim of this study was to study the effect of ZnO concentration on the morphology, mechanical, and crystallization behaviors of iPP. Three compositions of iPP/mZnO and iPP/nZnO composites were prepared in a co-rotational twin-screw extruder machine with ZnO content of 2 wt%, 5 wt%, and 8 wt%. Tensile tests showed that the tensile strength at yield and tensile modulus of the composites tended to increase with increasing contents of mZnO/nZnO particles. This improvement in the tensile properties was attributed to good interfacial adhesion between the fillers and the matrix, as evidenced by TEM examination. The tensile strength at yield and tensile modulus values of iPP/nZnO composite with the addition of 2–8 wt% nZnO are higher than those of virgin iPP, and even higher than those of iPP/mZnO composite with the addition of 2–8 wt% mZnO. The non-isothermal crystallization behavior of iPP/mZnO and iPP/nZnO composites was investigated using DSC. The results indicated that the interfacial interaction between iPP and mZnO/nZnO increased the crystallization temperature when the content of ZnO is 5 wt%.

Rheological Behavior and Microstructure of Flame Retardant Polypropylene Composites

2010 ◽  
Author(s):  
Guo Jiang ◽  
Kai Liao ◽  
Juan-Juan Han ◽  
De-Xian Feng ◽  
Han-Xiong Huang
Keyword(s):  
Magnesium Hydroxide ◽  
Shear Viscosity ◽  
Flame Retardancy ◽  
Rheological Behavior ◽  
Oxygen Index ◽  
Complex Viscosity ◽  
Test Results ◽  
Screw Extruder ◽  
Polypropylene Composites ◽  
Twin Screw

Polypropylene (PP)/magnesium hydroxide (MDH) composite was melt-mixed using a twin-screw extruder. Two types of MDH were used, one with the modification of silane and another without. The rheological behavior was measured by capillary and dynamical rheometer. Microstructure of these composites was observed by SEM. Their flame retardancy was characterized by oxygen index and Horizontal/Vertical burning test. Results showed that shear viscosity and complex viscosity of PP with modified MDH were lower than that of PP with non-modified MDH. SEM results also showed a better dispersion of silane modified MDH in PP matrix. With the increase of MDH content, the oxygen index of composites was increased. When the content was increased to 60 wt%, the composite was UL94 HB and V-1.

Melt extrudate swell behavior of polypropylene composites filled with hollow glass beads

2012 ◽  
Vol 32 (4-5) ◽  
pp. 259-263 ◽  
Author(s):  
Ji-Zhao Liang ◽  
Ming-Qiang Zhong
Keyword(s):  
Volume Fraction ◽  
Deformation Energy ◽  
Glass Beads ◽  
Screw Extruder ◽  
Extrudate Swell ◽  
Experimental Conditions ◽  
Hollow Glass ◽  
Polypropylene Composites ◽  
Swell Ratio ◽  
Twin Screw

Abstract Polypropylene (PP) composites filled with hollow glass beads (HGB) were prepared by means of a twin-screw extruder. The extrudate swell ratio (B) of the PP/HGB composite melts was measured using a melt flow indexer under experimental conditions, with temperatures from 190°C to 230°C and loads varying from 1.20 kg to 7.50 kg, to identify the effects of the extrusion conditions and the particle size and content on the extrudate swell of composite melts. The results showed that the value of B of the composites increased nonlinearly with an increase of shear stress, while it decreased linearly with a rise of temperature. When the load and temperature were constant, the value of B increased nonlinearly with an increase of the HGB diameter, whereas it reduced nonlinearly with an increase of the HGB volume fraction. This should be attributed to the elastic deformation energy stored in the flow of the composite melts, which was decreased with an increase of the HGB number and content.

Toughening Modification of Poly(butylene terephthalate)/Polycarbonate Blends by Poly(ethylene-co-octene)

2005 ◽  
Vol 13 (4) ◽  
pp. 385-394
Author(s):  
Huiyu Bai ◽  
Yong Zhang ◽  
Yinxi Zhang ◽  
Xiangfu Zhang ◽  
Wen Zhou
Keyword(s):  
Average Diameter ◽  
Melt Blending ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Bisphenol A Polycarbonate ◽  
Elongation At Break ◽  
Butylene Terephthalate ◽  
Twin Screw ◽  
Poly Ethylene ◽  
The Impact

New toughened poly(butylene terephthalate) (PBT)/bisphenol A polycarbonate (PC) blends were obtained by melt blending with commercial poly(ethylene-co-octene) copolymer (POE), varying the POE content up to 10 wt%, in a twin screw extruder, followed by injection moulding. The influence of POE on the properties of the PBT/PC blends was investigated in terms of mechanical testing, dynamic mechanical thermal (DMTA) analysis, differential scanning calorimetry (DSC), and scanning electronic microscopy (SEM). The results showed that addition of POE led to remarkable increases in the impact strength, elongation at break and Vicat temperature, and a reduction in the tensile strength and flexural properties of PBT/PC blends. The morphology of the blends was observed using SEM and the average diameter of the dispersed phase was determined by image analysis. The critical inter-particle distance for PBT/PC was determined.

Structure and Mechanical Behavior of Isotactic Polypropylene Composites Filled with Silver Nanoparticles

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Sie Chin Tjong ◽  
Suping Bao
Keyword(s):  
Mechanical Behavior ◽  
Isotactic Polypropylene ◽  
Ag Nanoparticles ◽  
Screw Extruder ◽  
Additional Increase ◽  
Polypropylene Composites ◽  
Melt Compounding ◽  
Twin Screw ◽  
Izod Impact ◽  
The Impact

AbstractIsotactic polypropylene (PP) nanocomposites containing 0.1, 0.3, 0.5 and 1.0 wt % silver (Ag) nanoparticles were prepared via melt compounding in a twin-screw extruder followed by injection molding The effects of the Ag nanoparticle additions on the structure and mechanical behavior of PP were studied using DSC, WXRD, optical microscopy, tensile and Izod impact techniques. DSC and WXRD measurements showed that the addition of only 0.1 wt% Ag nanoparticles promote the formation of β-form PP. Further increasing Ag content would not lead to additional increase of the β-PP phase content. The induced β- form PP phase is beneficial to enhance the impact strength and tensile ductility of the PP/Ag nanocomposites.

Effect of Compatibilizer Content on the Mechanical and Morphological Properties of PET/PP (70/30) Blends

2015 ◽  
Vol 735 ◽  
pp. 70-74
Author(s):  
Ibrahim Mohammed Inuwa ◽  
Azman Hassan ◽  
Sani Amril Samsudin
Keyword(s):  
Mechanical Properties ◽  
Triblock Copolymer ◽  
Standard Test ◽  
Morphological Properties ◽  
Screw Extruder ◽  
Elongation At Break ◽  
Young’S Moduli ◽  
Morphological Studies ◽  
Twin Screw ◽  
Pp Blends

This work investigates the effect of compatibilizer concentration on the mechanical properties of compatibilized polyethylene terephthalate (PET) /polypropylene (PP) blends. A blend containing 70 % (wt) PET, 30 % (wt) PP and 5 - 15 phr compatibilizers were compounded using counter rotating twin screw extruder and fabricated into standard test samples using injection molding. The compatibilizer used is styrene-ethylene-butylene-styrene grafted maleic anhydride triblock copolymer (SEBS-g-MAH). Morphological studies show that the particle size of the dispersed PP phase is dependent on the compatibilizer content up to 10 phr. Impact strength and elongation at break showed maximum values with the addition of 10 phr SEBS-g-MAH and a corresponding decrease in flexural and young’s moduli; and strengths.. Overall the mechanical properties of PET/PP blends depend on the control of the morphology of the blend and can be achieved by effective compatibilization using 10 phr SEBS-g-MAH.

scholarly journals Properties of Raphia Palm Interspersed Fibre Filled High Density Polyethylene

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Henry C. Obasi
Keyword(s):  
Particle Size ◽  
Young’S Modulus ◽  
High Density Polyethylene ◽  
Young's Modulus ◽  
High Density ◽  
Screw Extruder ◽  
Elongation At Break ◽  
Twin Screw ◽  
Partial Degradation ◽  
Different Levels

Blends of nonbiodegradable and biodegradable polymers can promote a reduction in the volume of plastic waste when they undergo partial degradation. In this study, properties of raphia palm interspersed fibre (RPIF) filled high density polyethylene (HDPE) have been investigated at different levels of filler loadings, 0 to 60 wt.%. Maleic anhydride-graft polyethylene was used as a compatibilizer. Raphia palm interspersed fibre was prepared by grinding and sieved to a particle size of 150 µm. HDPE blends were prepared in a corotating twin screw extruder. Results showed that the tensile strength and elongation at break of the blends decreased with increase in RPI loadings and addition of MA-g-PE was found to improve these properties. However, the Young’s modulus increased with increase in the amount of RPI into HDPE and compatibilization further increased the Young’s modulus. The water absorption indices and weight loss for RPI/HDPE composites were found to increase with RPI loadings but were decreased on addition of MA-g-PE.

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