Effect of wood fibers on the rheological properties of i-PP/wood fiber composites

2003 ◽  
Vol 91 (1) ◽  
pp. 644-650 ◽  
Author(s):  
S. N. Maiti ◽  
R. Subbarao ◽  
Mohd. Nordin Ibrahim
Keyword(s):  
Rheological Properties ◽  
Wood Fiber ◽  
Fiber Composites ◽  
Wood Fibers

Quantifying effects of compositional variations on microstructural properties of polypropylene-wood fiber composites by melt rheology and tensile test data

2018 ◽  
Vol 53 (4) ◽  
pp. 503-514 ◽  
Author(s):  
Ali Durmus ◽  
Mehmet Ozcan ◽  
Ismail Aydin
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
Wood Fiber ◽  
Micromechanical Model ◽  
Viscoelastic Behavior ◽  
Alkaline Treatment ◽  
Fiber Composites ◽  
Test Machine ◽  
Wood Fibers ◽  
Compositional Variations

In this study, melt-state rheological behavior and solid-state mechanical properties of polypropylene-wood fiber composites were investigated in detail depending on compositional variations such as (i) alkaline treatment on wood fibers, (ii) fiber size, (iii) wood fiber content, and (iv) compatibilizer/wood fiber ratio. Composite samples were prepared in a lab-scale co-rotating twin screw extruder by using a maleic anhydride grafted polypropylene as compatibilizer. Morphological features of composites were examined in a scanning electron microscopy. Viscoelastic behavior and mechanical properties of samples were analyzed by performing oscillatory tests in a rotational rheometer and a universal tensile test machine. It was found that the increasing amounts of wood fiber and compatibilizer/wood fiber ratio led to improve melt elasticity and tensile strength. It was concluded that the amount of compatibilizer into composite formulation was the most important compositional parameter compared to size and chemical treatment of wood fibers for improving the physical properties of composites. The Nicolais-Nicodemo micromechanical model showed that the increasing amount of compatibilizer yielded lower parameters which implied better interfacial adhesion between polypropylene and wood fibers.

A Novel Design for Producing Fine-Celled Foams of Plastic/Wood-Fiber Composites

2000 ◽  
Author(s):  
Ghaus M. Rizvi ◽  
Chul B. Park
Keyword(s):  
System Design ◽  
Cell Morphology ◽  
Fiber Composite ◽  
Wood Fiber ◽  
Fiber Composites ◽  
Wood Fibers ◽  
Blowing Agent ◽  
Composite Foams ◽  
Innovative System ◽  
Novel Design

Abstract This paper presents an innovative system design for production of plastic/wood-fiber composite foams based on a chemical blowing agent (CBA). Wood-fiber inherently contains moisture, which adversely affects the foam processing and the resultant cell morphology. To improve the cell morphology, the moisture content in the final foam should be minimized. A novel system design is presented for achieving this goal. Undried wood-fibers were processed together with HDPE, CBA and a coupling agent (CA) in a tandem extrusion system. At the interconnection of the two extruders, a vent was provided to purge the moisture into the atmosphere. HDPE/wood-fiber composite foams were produced on this system and on a single extruder without the vent, for comparison. The cellular morphology and volume expansion ratios of the foamed composites were characterized. The foams produced on the newly developed tandem system exhibited significantly improved cell morphology and surface quality.

scholarly journals Rheological Properties of Wood–Plastic Composites by 3D Numerical Simulations: Different Components

Forests ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 417
Author(s):  
Xingcong Lv ◽  
Xiaolong Hao ◽  
Rongxian Ou ◽  
Tao Liu ◽  
Chuigen Guo ◽  
...  
Keyword(s):  
Flow Field ◽  
Rheological Properties ◽  
Wood Fiber ◽  
Velocity Shear ◽  
Wood Plastic Composites ◽  
Shear Rates ◽  
Plastic Composites ◽  
Power Law Fluids ◽  
Field Information ◽  
Computational Fluid Dynamics Cfd

The rheological properties of wood–plastic composites (WPCs) with different wood fiber contents were investigated using a rotational rheometer under low shear rates. The flow field information was analyzed and simulated by Ansys Polyflow software. The results showed that the WPCs with different wood fiber contents behaved as typical power-law fluids. A higher wood fiber content increased the shear thinning ability and pseudoplasticity of the WPCs. The pressure, velocity, shear rate, and viscosity distributions of the WPC during extrusion could be predicted by computational fluid dynamics (CFD) Ansys Polyflow software to explore the effects of different components on the flow field of WPCs.

Effect of the delignification of wood fibers on the mechanical properties of wood fiber–polypropylene composites

2006 ◽  
Vol 102 (5) ◽  
pp. 4759-4763 ◽  
Author(s):  
Alinaghi Karimi ◽  
Saleh Nazari ◽  
Ismaeil Ghasemi ◽  
Mehdi Tajvidi ◽  
Ghanbar Ebrahimi
Keyword(s):  
Mechanical Properties ◽  
Wood Fiber ◽  
Wood Fibers ◽  
Polypropylene Composites

UV aging of poly(propylene)/wood-fiber composites

2004 ◽  
Vol 25 (5) ◽  
pp. 543-553 ◽  
Author(s):  
Ragnar Seldén ◽  
Birgitha Nyström ◽  
Runar Långström
Keyword(s):  
Wood Fiber ◽  
Fiber Composites ◽  
Uv Aging ◽  
Poly Propylene

scholarly journals Thermal insulation properties of green vacuum insulation panel using wood fiber as core material

BioResources ◽  
2019 ◽  
Vol 14 (2) ◽  
pp. 3339-3351 ◽  
Author(s):  
Baowen Wang ◽  
Zhihui Li ◽  
Xinglai Qi ◽  
Nairong Chen ◽  
Qinzhi Zeng ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Bulk Density ◽  
Thermal Insulation ◽  
Wood Fiber ◽  
Core Material ◽  
High Porosity ◽  
Total Thermal Conductivity ◽  
Wood Fibers ◽  
Vacuum Insulation ◽  
Vacuum Insulation Panel

Wood fibers were prepared as core materials for a vacuum insulation panel (VIP) via a dry molding process. The morphology of the wood fibers and the microstructure, pore structure, transmittance, and thermal conductivity of the wood fiber VIP were tested. The results showed that the wood fibers had excellent thermal insulation properties and formed a porous structure by interweaving with one another. The optimum bulk density that led to a low-cost and highly thermally efficient wood fiber VIP was 180 kg/m3 to 200 kg/m3. The bulk density of the wood fiber VIP was 200 kg/m3, with a high porosity of 78%, a fine pore size of 112.8 μm, and a total pore volume of 7.0 cm3·g-1. The initial total thermal conductivity of the wood fiber VIP was 9.4 mW/(m·K) at 25 °C. The thermal conductivity of the VIP increased with increasing ambient temperature. These results were relatively good compared to the thermal insulation performance of current biomass VIPs, so the use of wood fiber as a VIP core material has broad application prospects.

scholarly journals Uso de almidón de papa modificado como agente acoplante en compuestos polímero-fibras de madera/The effect of potato starch modified as a coupling agent in polymer-wood fiber composites

Prospectiva ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 107-113
Author(s):  
Yenny Marlén González Mancilla
Keyword(s):  
Coupling Agent ◽  
Potato Starch ◽  
Wood Fiber ◽  
Fiber Composites

En los materiales compuestos es importante lograr una buena unión entre la matriz y el refuerzo, para lo cual se utiliza un agente de acoplamiento. Se estudió el efecto del almidón de papa modificado como agente acoplante, en la resistencia mecánica y en la morfología de la interfase, de un compuesto polímero-aserrín de madera. Se utilizó polietileno de baja densidad (PEBD) reciclado de 70 a 80 % p/p, fibras de madera (aserrín) 15 a 25 %, que fueron secadas y clasificadas a tamaño de malla 60 y almidón de papa modificado (5 a 15 %), como agente acoplante. Las materias primas fueron mezcladas, conformadas por extrusión en caliente, a 110 °C (entrada) y 210 °C (salida). El material obtenido fue moldeado y prensado. Se fabricaron 4 mezclas y se obtuvieron láminas para fabricar probetas para ensayos de tracción y de flexión, se seleccionaron 32 por cada mezcla. Los resultados mostraron que el almidón de papa modificado incrementó la resistencia a la tracción y a la flexión del compuesto, con respecto a las muestras sin agente acoplante. Se observó la impregnación de las fibras con la matriz al usar almidón de papa modificado como agente acoplante, a lo que se atribuye el aumento en la resistencia.

scholarly journals Evaluation of Alternative Substrates and Fertilizer Regimes for the Nursery Cultivation of Phyllostachys pubescens (Carrière) J. Houz.

2017 ◽  
Vol 45 (2) ◽  
pp. 442-445
Author(s):  
Federica LARCHER ◽  
Luca BATTISTI ◽  
Walter GAINO ◽  
Marco DEVECCHI
Keyword(s):  
Rice Husk ◽  
Wood Fiber ◽  
Phyllostachys Pubescens ◽  
Wood Fibers ◽  
Alternative Materials ◽  
Before And After ◽  
Sustainable Cultivation ◽  
Recorded Data ◽  
Fertilizer Regimes ◽  
Coconut Fibers

The economic importance of the bamboo cultivation in Asia is well known, but the recent rise of interest in Europe required more deep studies on growing techniques. Among the bamboo species, the Phyllostachys pubescens (Carrière) J. Houz. is appreciated for its multiple uses: landscaping, timber and shoots production. In order to identify the best and sustainable combination of substrates and fertilization regimes, a nursery experimental trial was performed in 2016. Eight treatments (four substrates and two fertilization regimes) with 256 young plantlets divided into four randomized blocks were evaluated. The substrates used were: 40% peat, 40% coconut fibers, 20% pumice (standard substrate, S1); 30% peat, 40% coconut fibers, 10% rice husk, 20% pumice (S2); 30% peat, 40% coconut fibers, 20% rice husk, 10% pumice (S3); 30% peat, 40% coconut fibers, 20% wood fibers, 10% pumice (S4). The two fertilization regimes were: 1.6 g l-1 (A) and 0.8 g l-1 (B) NPK (16-11-10) Osmocote Exact®. All substrates were supplemented with a fungal inoculum (2.5 g l-1) and corrected with 2.5 × 10-3 g l-1 of CaCO3. The number of culms and leaves and the SPAD values of six plants of each blocks were monthly measured. Fresh and dry weights, before and after cultivation was recorded. Data were statistically analyzed. Results showed that rice husk should be used only in low percentage, but wood fiber can be more suitable for bamboo cultivation. The combination of alternative materials and low fertilization regimes (S1_B and S4_B) should be the key for a more sustainable cultivation for potted Phyllostachys pubescens in Europe.

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