Effect of processing temperature and foaming agent loading on properties of polylactic acid/kenaf fiber composite foam

2019 ◽  
Vol 7 ◽  
pp. 601-606 ◽  
Author(s):  
Nur Adilah Abu Hassan ◽  
Sahrim Ahmad ◽  
Ruey Shan Chen ◽  
Farrah Diyana Zailan ◽  
Dalila Shahdan
Keyword(s):  
Polylactic Acid ◽  
Fiber Composite ◽  
Processing Temperature ◽  
Kenaf Fiber ◽  
Composite Foam ◽  
Foaming Agent

scholarly journals Production of Biopolymer Foams Based on Polylactic Acid Plasticized With Lactic Acid Oligomer

2021 ◽  
Vol 4 (1) ◽  
pp. 32-37
Author(s):  
Katalin Litauszki ◽  
Ákos Kmetty
Keyword(s):  
Electron Microscopy ◽  
Lactic Acid ◽  
Polylactic Acid ◽  
Cell Structure ◽  
Processing Temperature ◽  
Foaming Agent ◽  
Fracture Surfaces ◽  
Density Reduction ◽  
Foaming Process ◽  
The Future

Abstract In our work, we modified polylactic acid biopolymer using oligomeric lactic acid. We have successfully plasticised polylactic acid compounds with 5, 10, 20 wt% oligomeric lactic acid using a liquid dosing system connected to a compounder extruder. The produced compounds were foamed with an exothermic chemical foaming agent. The density of the foams was measured and the fracture surfaces were examined by electron microscopy to assess the homogeneity of the cell structure. Based on this, we believe that the plasticising effect of oligomeric lactic acid is undeniable, but a processing temperature of 190 °C is not optimal for the foaming process. In the future, the production of biopolymer foam structures with a higher density reduction can be achieved by reducing and optimizing the foam processing temperature.

scholarly journals Resistance to Cleavage of Core–Shell Rubber/Epoxy Composite Foam Adhesive under Impact Wedge–Peel Condition for Automobile Structural Adhesive

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 152 ◽  
Author(s):  
Jong-Ho Back ◽  
Dooyoung Baek ◽  
Jae-Ho Shin ◽  
Seong-Wook Jang ◽  
Hyun-Joong Kim ◽  
...  
Keyword(s):  
Pore Size ◽  
Epoxy Composite ◽  
Impact Resistance ◽  
Expansion Ratio ◽  
Core Shell ◽  
Scanning Calorimetry ◽  
Composite Foam ◽  
Foaming Agent ◽  
Epoxy Foam ◽  
The Impact

Epoxy foam adhesives are widely used for weight reduction, watertight property, and mechanical reinforcement effects. However, epoxy foam adhesives have poor impact resistance at higher expansion ratios. Hence, we prepared an epoxy composite foam adhesive with core–shell rubber (CSR) particles to improve the impact resistance and applied it to automotive structural adhesives. The curing behavior and pore structure were characterized by differential scanning calorimetry (DSC) and X-ray computed tomography (CT), respectively, and impact wedge–peel tests were conducted to quantitatively evaluate the resistance to cleavage of the CSR/epoxy composite foam adhesives under impact. At 5 and 10 phr CSR contents, the pore size and expansion ratio increased sufficiently due to the decrease in curing rate. However, at 20 phr CSR content, the pore size decreased, which might be due to the steric hindrance effect of the CSR particles. Notably, at 0 and 0.1 phr foaming agent contents, the resistance to cleavage of the adhesives under the impact wedge–peel condition significantly improved with increasing CSR content. Thus, the CSR/epoxy composite foam adhesive containing 0.1 phr foaming agent and 20 phr CSR particles showed high impact resistance (EC = 34,000 mJ/cm2) and sufficient expansion ratio (~148%).

Pultrusion Technology Optimization for Hybrid Fiber Composites Based on DSC and Mechanical Property Testing

2011 ◽  
Vol 295-297 ◽  
pp. 383-387 ◽  
Author(s):  
Li Chen ◽  
Qi Lin Zhao ◽  
Ke Bin Jiang ◽  
Yong Ding
Keyword(s):  
Mechanical Properties ◽  
Fiber Composite ◽  
Processing Parameters ◽  
Fiber Composites ◽  
Processing Temperature ◽  
Processing Parameter ◽  
Heating Rates ◽  
Hybrid Fiber ◽  
Scanning Calorimetry ◽  
Parameter Ranges

In the interest of improving the curing effect and mechanical properties of pultruded carbon/glass bybrid fiber composites, the DSC (Differential Scanning Calorimetry) technology was introduced and the curing DSC curves for the hybrid fiber composites at 4 different heating rates was attained. Then the range of the processing temperature for the three-stage heating pultrusion was primarily determined with T-β method. Subsequently a kind of carbon/glass hybrid composite pole with a diameter of 11mm was selected as the research object, and was manufactured with varies of processing temperatures and speeds. The produced poles were mechanically tested to investigate the effect of processing parameters on the mechanical properties of the composite, so as to further more ascertain the processing parameter ranges fitting to this material formula. As the result shows: the pultrusion processing parameters for the hybrid fiber composite acquired in this study can satisfy the require of manufacturing; compared with the traditional method that attain processing parameters by experience, the method for attaining processing parameters suggested in this paper is more efficiency, more economical and more accurate.

The Effect of Compression Temperature and Time on 2D Woven Kenaf Fiber Reinforced Acrylonitrile-Butadiene-Styrene (ABS)

2013 ◽  
Vol 315 ◽  
pp. 630-634
Author(s):  
Mohd Pahmi bin Saiman ◽  
Wahab Saidin ◽  
Mat Uzir Wahit
Keyword(s):  
Acrylonitrile Butadiene Styrene ◽  
Natural Fibre ◽  
Woven Fabric ◽  
Processing Temperature ◽  
Hot Press ◽  
Kenaf Fiber ◽  
Good Penetration ◽  
Plain Fabric ◽  
Woven Kenaf ◽  
Butadiene Styrene

A natural fibre-based composite from woven kenaf was fabricated using hydraulic hot press machine. Plain woven kenaf fabrics were prepared and used as reinforced material with ABS sheet followed by hot press. Woven fabric was treated using sodium hydroxide and being compare with untreated fabric. The effect of the processing temperature and time towards tensile properties of the composite were investigated. Tensile test was carried out to measure the strength of the composite towards the effect of processing temperature and time. The surface morphology of the composite was studied with Scanning Electron Microscope (SEM) and Optical Microscopic. The result shows that woven Kenaf degrade in strength when expose with high temperature and long exposure to the heat. The permeability of woven Kenaf plain fabric does not indicate a good penetration as observed by microscopy.

scholarly journals Effect of Environmental Degradation on Mechanical Properties of Kenaf/Polyethylene Terephthalate Fiber Reinforced Polyoxymethylene Hybrid Composite

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Mohamad Zaki Abdullah ◽  
Yakubu Dan-mallam ◽  
Puteri Sri Melor Megat Yusoff
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Environmental Degradation ◽  
Hybrid Composite ◽  
Fiber Composite ◽  
Accelerated Weathering ◽  
Fiber Reinforced ◽  
Kenaf Fiber ◽  
Pet Fibers ◽  
Outdoor Application

The main objective of this research is to investigate the effect of environmental degradation on the mechanical properties of kenaf/PET fiber reinforced POM hybrid composite. Kenaf and PET fibers were selected as reinforcements because of their good mechanical properties and resistance to photodegradation. The test samples were produced by compression molding. The samples were exposed to moisture, water spray, and ultraviolet penetration in an accelerated weathering chamber for 672 hours. The tensile strength of the long fiber POM/kenaf (80/20) composite dropped by 50% from 127.8 to 64.8 MPa while that of the hybrid composite dropped by only 2% from 73.8 to 72.5 MPa. This suggests that the hybrid composite had higher resistance to tensile strength than the POM/kenaf composite. Similarly, the results of flexural and impact strengths also revealed that the hybrid composite showed less degradation compared to the kenaf fiber composite. The results of the investigation revealed that the hybrid composite had better retention of mechanical properties than that of the kenaf fiber composites and may be suitable for outdoor application in the automotive industry.

scholarly journals Mechanical Properties of Banana Fabric and Kenaf Fiber Reinforced Epoxy Composites: Effect of Treatment and Hybridization

2019 ◽  
Vol 8 (10) ◽  
pp. 1870-1874
Keyword(s):  
Mechanical Properties ◽  
Natural Fiber ◽  
Fiber Composite ◽  
Fiber Reinforced Composites ◽  
Synthetic Fiber ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Kenaf Fiber ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

Nowadays, Natural Fiber Reinforced composites (NFCs) are emerging to be a good substitute for synthetic fiber reinforced composites as NFCs have many advantages such as low density, high specific strength, recyclability, low cost and good sound abatement quality etc. Among all types of NFCs, a vast study has been done on banana fiber and kenaf fiber reinforced composite. However, only limited work has been done on the banana fabric, kenaf fiber reinforced composite and the effect of their hybridization on mechanical properties. In this paper, an attempt has been made to study the mechanical properties of the banana fabric, kenaf fiber and hybrid banana fabric/kenaf fiber reinforced composites. Effect of alkali treatment on kenaf fiber reinforced composite is discussed in the paper. For the present work, plain-woven banana fabric and randomly oriented kenaf fiber are used as reinforcement while the epoxy resin is used as a matrix. samples are fabricated using hand lay-up and vacuum bagging method. Curing is done at ambient temperature (250C-300C) for 48h. Tensile, impact and hardness test has been performed on a specimen according to ASTM standards. Improvement in mechanical properties is observed after alkali (6% NaOH) treatment on kenaf fiber reinforced composite. Tensile testing behavior of randomly oriented kenaf fiber composite has been studied using Finite element method and results are compared with experimental investigations. This topic present big potential because it seeks to find solution for sustainable development with environmental concerns.

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