Compressive Properties of Polylactic Acid-Based Nanocomposite Foams Reinforced with Coconut Fibers

2016 ◽  
Vol 851 ◽  
pp. 19-25
Author(s):  
Tarinee Nampitch ◽  
Thiti Kaisone ◽  
Pran Hanthanon ◽  
Chanon Wiphanurat
Keyword(s):  
Silica Nanoparticles ◽  
Compressive Force ◽  
Compressive Properties ◽  
Coconut Fiber ◽  
Composite Foam ◽  
Molding Method ◽  
Nanocomposite Foams ◽  
Nanocomposite Foam ◽  
Properties Of Composites ◽  
Coconut Fibers

The investigation focused on the properties of composite foam obtained by a compression molding method. The results could clarify the interaction among PLA, silica nanoparticles and coconut fiber. The compressive properties, including the compressive force and modulus of composites, contained in coconut fiber were improved. The incorporation of silica nanoparticles was able to modify the compressive properties slightly, whereas the thermal properties were decreased explicitly. Hydrogen bonding between the carboxylic group of PLA and the silica bonded group affected the increment in mechanical properties of composites. However, the incorporation of coconut fibers in composites exhibited a rougher surface. In addition, beneficial distribution of silica nanoparticles and porosity in the nanocomposite foam, equivalent to neat PLA foam, could be obtained.

Mechanical and Thermal Properties of Toughened PLA Composite Foams with Modified Coconut Fiber

2016 ◽  
Vol 851 ◽  
pp. 179-185
Author(s):  
Thiti Kaisone ◽  
Nathdanai Harnkarnsujarit ◽  
Thanawadee Leejarkpai ◽  
Tarinee Nampitch
Keyword(s):  
Natural Rubber ◽  
Compressive Stress ◽  
Nucleating Agent ◽  
Mechanical And Thermal Properties ◽  
Coconut Fiber ◽  
High Fiber ◽  
Molding Method ◽  
Composite Foams ◽  
Rubber Phase ◽  
Coconut Fibers

Composite foams from PLA, natural rubber and modified coconut fibers was prepared employing a compression molding method, which is suitable for the fabrication of composites containing high fiber content. The results revealed that the incorporation of natural rubber into composite foams increases the compressive stress to 101.17 kN/m2. Further, a 10% wt increase of modified coconut fiber added into composite foams resulted in an increase of compressive stress to 105.24 kN/m2. The addition of modified coconut fibers in composite foams showed a slight decrease of the crystallization state, obtained by DSC results by about 1-3 oC. Thus, modified coconut fibers played a role as a nucleating agent. Moreover, the combination of modified coconut fibers in composite foams could lead to improved adhesion between the surface area of PLA matrix and the natural rubber phase.

Preparation and properties of polyimide/Fe3O4 composite foams

2018 ◽  
Vol 47 (2) ◽  
pp. 173-179 ◽  
Author(s):  
Ling Weng ◽  
Ting Wang ◽  
Pei-Hai Ju ◽  
Li-Zhu Liu
Keyword(s):  
Electromagnetic Interference ◽  
Temperature Stability ◽  
Electromagnetic Shielding ◽  
Great Promise ◽  
Electromagnetic Interference Shielding ◽  
High Temperature Stability ◽  
Composite Foam ◽  
Content Type ◽  
Nanocomposite Foams ◽  
Composite Foams

Purpose This paper aims to develope the electromagnetic interference shielding materials with high performance. To develop advanced polymer-based electromagnetic interference shielding materials with rather high temperature stability, good processability and moderate mechanical properties, the authors chose the polyimide (PI) foam as matrix and ferriferrous oxide (Fe3O4) as fillers to prepare the composite foams with lightweight and rather good electromagnetic interference shielding performance. Design/methodology/approach Some polyimide nanocomposite foams with Fe3O4 as fillers have been prepared by in situ dispersion and foaming with pyromellitic dianhydride (PMDA) and isocyanate (PAPI) as raw materials and water as foaming agent. By varying the Fe3O4 contents, a series of PI/Fe3O4 nanocomposite foams with fine microstructures and high thermal stability were obtained. The structure and performances of nanocomposite foams were examined, and the effects of Fe3O4 on the microstructure and properties of composite foams were investigated. Findings This work demonstrates that PI/Fe3O4 foams could be fabricated by thermally treating the polyimide foam intermediates with Fe3O4 nanoparticles through a blending reaction of precursors. The final PI/Fe3O4 composite foams maintained the excellent thermal property and showed a super paramagnetic behaviour, which has a positive effect on the improvement of electromagnetic shielding performance. Research limitations/implications In this paper, the effects of Fe3O4 on the performances of PI/Fe3O4 composite foam were reported. It provided an effective methodology for the preparation of polymer/Fe3O4 nanocomposite foams, which hold great promise towards the potential application in the areas of electromagnetic shielding materials. Originality/value A series of PI/Fe3O4 composite foams with different contents of Fe3O4 were prepared by blending reaction of the precursors. The effects of Fe3O4 on the structures and properties of PI/Fe3O4 composite foam were discussed in detail.

scholarly journals Synthesis and Characterization of Polyurethane-Nanoclay Composites

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Manasa Nayani ◽  
Subhashini Gunashekar ◽  
Nidal Abu-Zahra
Keyword(s):  
Thermal Properties ◽  
Cell Structure ◽  
Thermoplastic Polyurethane ◽  
Mechanical And Thermal Properties ◽  
Composite Foam ◽  
Weight Percentage ◽  
Nanocomposite Foams ◽  
Methylene Diphenyl Diisocyanate ◽  
Closed Mold

In this study polyurethane (PUR)-nanoclay composites were synthesized using methylene diphenyl diisocyanate, polyol, and hectorite clay. The weight percentage of hectorite clay was varied at three different levels to study its effect on the properties of the thermoplastic polyurethane nanocomposite. The nanocomposite polyurethane foam was synthesized in a 2-step reaction process. The first step involved the addition and dispersion of nanoclay into the isocyanate. The mixture was then mixed with the polyol, and the foam was cast in a preheated closed mold. The PUR-nanocomposite foams were analyzed for cell structure, physical, mechanical, and thermal properties. The composite foam showed significant increase in tensile and flexural strengths, abrasion resistance, and thermal properties.

Preparation, characterization, and properties of castor oil-based flexible polyurethane/Cloisite 30B nanocomposites foam

2017 ◽  
Vol 52 (4) ◽  
pp. 531-542 ◽  
Author(s):  
Siva Sankar Panda ◽  
Sushanta K Samal ◽  
Smita Mohanty ◽  
Sanjay K Nayak
Keyword(s):  
Polyurethane Foam ◽  
Castor Oil ◽  
Soft Segment ◽  
Weight Ratio ◽  
Nanocomposite Foams ◽  
Cloisite 30B ◽  
Flexible Polyurethane Foam ◽  
Nanocomposite Foam ◽  
Flexible Polyurethane ◽  
The Impact

The present study represents the synthesis of flexible polyurethane nanocomposite foam using Cloisite 30B nanoclays varying at 1, 2, and 3 wt%. The polyurethane nanocomposite foam formulated with 50:50 weight ratio of synthetic polyether polyol and renewable resource-based castor oil. The progress of isocyanate reaction and formation of bidentate urea through H-bonding in the polymeric matrix phase were confirmed from Fourier transform infrared analysis. The surface morphology of the nanocomposite foams was examined by scanning electron microscopy and X-ray diffraction analysis. Polyurethane nanocomposite foam displayed exfoliated structures at 3 wt% Cloisite 30B. The thermal and mechanical properties were also studied to report the impact of Cloisite 30B in biobased flexible polyurethane foam. Enhanced thermogravimetric outcome signified higher thermal stability of polyurethane nanocomposite foam as compared to polyurethane foam. Further, improvement of the soft segment glass transition temperature (Tg) confirmed the role of Cloisite 30B in the phase separation behavior between the hard segment and soft segment in nanocomposite foams. A significant enhancement in the mechanical strength with incorporation of a small amount of Cloisite 30B nanoclay to the flexible polyurethane foam allows it for various low cost applications.

scholarly journals Properties of green particleboard manufactured from coconut fiber using a potato starch based adhesive

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 2279-2292 ◽  
Author(s):  
Amina Adedoja Owodunni ◽  
Junidah Lamaming ◽  
Rokiah Hashim ◽  
Owolabi Folahan Abdulwahab Taiwo ◽  
Mohd Hazwan Hussin ◽  
...  
Keyword(s):  
Citric Acid ◽  
Elasticity Modulus ◽  
Potato Starch ◽  
Cocos Nucifera ◽  
Modulus Of Rupture ◽  
Coconut Fiber ◽  
Japanese Industrial Standard ◽  
Internal Bonding Strength ◽  
Particle Weight ◽  
Coconut Fibers

Particleboards were manufactured using coconut fibers (Cocos nucifera). The panels were made using different green adhesives, i.e., native potato starch, citric acid, and glutardialdehyde modified potato starch, that were applied at 10%, 12%, and 15% based on oven-dry particle weight for each green adhesive type. The properties of the panels were determined according to the Japanese industrial standard. The results showed that the panels that were bonded with the 15% citric acid-modified starch green adhesive yielded the best mechanical properties (the modulus of elasticity, modulus of rupture, and internal bonding strength). The modified potato starch had potential as a green adhesive used for the production of particleboards from coconut fibers.

scholarly journals PEMANFAATAN LIMBAH SERABUT KELAPA DI DESA KORLEKO KECAMATAN LABUHAN HAJI KABUPATEN LOMBOK TIMUR

2020 ◽  
Vol 1 (3) ◽  
Author(s):  
Ahmad Ardian Ariatma ◽  
Abdul Kadir ◽  
Fahruddin Fahruddin
Keyword(s):  
Economic Value ◽  
Coconut Fiber ◽  
The People ◽  
Lombok Island ◽  
Economic Income ◽  
Coconut Fibers

ABSTRAK. Kelapa merupakan salah satu sumber pendapatan ekonomi masyarakat Desa Korleko. Desa Korleko terkenal sebagai salah satu penghasil kelapa terbesar di Pulau Lombok, namun saat ini potensi kelapa tersebut belum dimanfaatkan secara optimal. Kelapa dijual tanpa melalui proses pengolahan terlebih dahulu. Jika dilakukan pengolahan kelapa terlebih dahulu sebelum dilakukan pemasaran maka nilai jual kelapa akan meningkat. Serabut kelapa adalah hasil produk sampingan dari kelapa yang menjadi limbah dan kurang dimanfaatkan. Serabut kelapa dapat diolah menjadi cocofiber (serat sabut kelapa) dan cocopeat (serbuk sabut kelapa atau gabus) yang dapat di manfaatkan menjadi berbagai produk diantaranya serabut kelapa menjadi keset, sapu, isi bantal dan media tanam holtikultura, serta masih banyak lagi. Semua produk tersebut dapat diproses dengan mudah oleh masyarakat dan memiliki nilai ekonomi yang tinggi sehingga dapat meningkatkan ekonomi masyarakat.______________________ Kata kunci : Kelapa, Limbah Serabut Kelapa, cocofiber, cocopeat, Desa Korleko ABSTRACT. Coconut is a source of economic income for the people of Korleko Village. Korleko village is famous as one of the biggest coconut producers on Lombok Island, but at present the potential of coconut has not been used optimally. Coconut is sold without going through the processing first. If coconut processing is carried out prior to marketing, the selling value of coconuts will increase. Coconut fiber is a byproduct of coconut which is waste and is underused. Coconut fiber can be processed into cocofiber (coconut fiber) and cocopeat (coconut fiber powder or cork) which can be utilized as various products including coconut fibers into mats, brooms, pillow contents and horticultural planting media, and many more. All of these products can be processed easily by the community and have high economic value so as to improve the community's economy.______________________ Keywords: Coconut, Coconut Fiber Waste, cocofiber, cocopeat, Korleko Village

scholarly journals Study on Durability Properties of Coconut Shell Concrete with Coconut Fiber

Buildings ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 107 ◽  
Author(s):  
Anandh Sekar ◽  
Gunasekaran Kandasamy
Keyword(s):  
Water Immersion ◽  
Coconut Shell ◽  
Test Results ◽  
Coconut Fiber ◽  
Conventional Concrete ◽  
Curing Conditions ◽  
Temperature Resistance ◽  
Durability Properties ◽  
Dry Conditions ◽  
Coconut Fibers

Coconut fiber was used in coconut shell concrete (CSC) and its durability properties were studied. The properties include: water absorption, volume of permeable pore voids, rapid chloride penetration test, sorptivity and resistance at elevated temperature. For comparison purpose, these properties were also studied on conventional concrete (CC) with coconut fibers. Three different curing conditions viz. full water immersion, site curing and air-dry conditions were employed except for temperature resistance study in which only full water immersion was used. Test results show that the durability properties were better in full water immersion condition in case of CC mixes and in site curing condition in case of CSC mixes. Temperature resistance tests gave a minimum guarantee of both CC and CSC mixes without and with coconut fibers for 2 h resistance and hence they were deemed safe for construction.

The Effect of Nano Cement on the Compressive Strength of Coconut Fibers Reinforced Concrete Composite

2020 ◽  
Vol 831 ◽  
pp. 110-114
Author(s):  
Riana Herlina Lumingkewas ◽  
Sigit Pranowo Hadiwardoyo ◽  
Abrar Husen ◽  
Saepudin
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Specific Gravity ◽  
Natural Fibers ◽  
Research Needs ◽  
Coconut Fiber ◽  
Ordinary Concrete ◽  
Fiber Concrete ◽  
Coconut Fibers

The development of nanotechnology continues to grow. The use of nanocement in concrete is expected to reduce the number of pores and improve hydration in concrete and provide more strength to the concrete. The use of natural fibers, in this case, coconut fiber can prevent cracks in concrete and make fiber concrete more ductile than ordinary concrete. The effect of using nanocement on coconut fiber concrete on the strength of the concrete to be studied. Methodology to complete the research objectives, use nanocement used in concrete, which has added coconut fiber. Tests reviewed the value of slump and specific gravity. Then, testing the compressive strength at 7, 24, 28 days. The results obtained were an increase of 48.19% in the strength of concrete. Further research needs to review on mixing nanocement with other natural fibers.

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