Enhancement of impact properties of CFRP by inserting the non-hydrophobized cellulose nanofiber dispersion layer using an aqueous solution of epoxy resin

2021 ◽  
pp. 1-10
Author(s):  
Kazuaki Katagiri ◽  
Toshihiko Okumura ◽  
Sonomi Kawakita ◽  
Hirosuke Sonomura ◽  
Shinya Honda ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Epoxy Resin ◽  
Cellulose Nanofiber ◽  
Impact Properties ◽  
Dispersion Layer

scholarly journals Assessing the Flexural Properties of Epoxy Composites with Extremely Low Addition of Cellulose Nanofiber Content

2020 ◽  
Vol 10 (3) ◽  
pp. 1159 ◽  
Author(s):  
Yingmei Xie ◽  
Hiroki Kurita ◽  
Ryugo Ishigami ◽  
Fumio Narita
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Flexural Modulus ◽  
Strengthening Mechanism ◽  
Short Fiber ◽  
Cellulose Nanofiber ◽  
Resin Matrix ◽  
Element Analysis ◽  
Epoxy Resin Matrix ◽  
The Matrix

Epoxy resins are a widely used common polymer due to their excellent mechanical properties. On the other hand, cellulose nanofiber (CNF) is one of the new generation of fibers, and recent test results show that CNF reinforced polymers have high mechanical properties. It has also been reported that an extremely low CNF addition increases the mechanical properties of the matrix resin. In this study, we prepared extremely-low CNF (~1 wt.%) reinforced epoxy resin matrix (epoxy-CNF) composites, and tried to understand the strengthening mechanism of the epoxy-CNF composite through the three-point flexural test, finite element analysis (FEA), and discussion based on organic chemistry. The flexural modulus and strength were significantly increased by the extremely low CNF addition (less than 0.2 wt.%), although the theories for short-fiber-reinforced composites cannot explain the strengthening mechanism of the epoxy-CNF composite. Hence, we propose the possibility that CNF behaves as an auxiliary agent to enhance the structure of the epoxy molecule, and not as a reinforcing fiber in the epoxy resin matrix.

scholarly journals Fabrication of Amperometric Glucose Sensor Using Glucose Oxidase-Cellulose Nanofiber Aqueous Solution

2015 ◽  
Vol 31 (11) ◽  
pp. 1111-1114 ◽  
Author(s):  
Mikito YASUZAWA ◽  
Yuya OMURA ◽  
Kentaro HIURA ◽  
Jiang LI ◽  
Yusuke FUCHIWAKI ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Glucose Oxidase ◽  
Glucose Sensor ◽  
Cellulose Nanofiber ◽  
Amperometric Glucose Sensor

Photoluminescence Properties of Ru(bpy)32+ in TEMPO-Oxidized Cellulose Nanofiber Films

2017 ◽  
Vol 900 ◽  
pp. 146-149
Author(s):  
Lu Yang Song ◽  
Kotaro Takahashi ◽  
Takeshi Higuchi ◽  
Tadahiro Aita
Keyword(s):  
Aqueous Solution ◽  
Polymer Films ◽  
Luminescence Intensity ◽  
Cellulose Nanofiber ◽  
Luminescence Spectra ◽  
Oxidized Cellulose ◽  
Photoluminescence Properties ◽  
Decay Measurement ◽  
Cnf Films ◽  
High Luminescence Intensity

In this work, photoluminescent properties of Ru (bpy)32+ incorporated in cellulose nanofiber (CNF) film was investigated by comparing with those in polyvinyl alcohol (PVA) and polyacrylic acid (PAA) films. In the polymer films, the luminescence intensity of Ru (bpy)32+ was high and λmax of luminescence spectra was blue-shifted compared with those in aqueous solution. The high luminescence intensity was also observed in cellulose nanofiber (CNF) films but the spectrum was red-shifted. Luminescence decay measurement showed that the decays in polymer films were exponential and the lifetimes were far longer than that in aqueous solution. On the other hand, in CNF films, the decays were composed of fast and slow ones. The luminescence properties of Ru (bpy)32+ in CNF films were discussed based on the stabilization of excited state and the dispersibility of Ru (bpy)32+ in the films.

Cyclodextrin functionalized cellulose nanofiber composites for the faster adsorption of toluene from aqueous solution

2017 ◽  
Vol 70 ◽  
pp. 352-358 ◽  
Author(s):  
Guohao Yuan ◽  
Mayakrishnan Prabakaran ◽  
Sun Qilong ◽  
Jung Soon Lee ◽  
Ill-Min Chung ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Cellulose Nanofiber

Influence of Different Matrices on the Tensile and Impact Properties of Treated Kenaf Composites

2016 ◽  
Vol 1133 ◽  
pp. 136-140
Author(s):  
Noor Haznida Bakar ◽  
Koay Mei Hyie ◽  
A. Jumahat ◽  
Eli Nadia A. Latip ◽  
Anizah Kalam ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Tensile Properties ◽  
Testing Machine ◽  
Low Velocity ◽  
Impact Properties ◽  
Weight Percentage ◽  
Kenaf Fibre ◽  
Naoh Solution ◽  
Kenaf Composites ◽  
The Impact

This study investigated the mechanical behavior of the treated and untreated kenaf with different matrix resin (epoxy and polyester) using the tensile and low velocity test. The long kenaf fibre was treated with 6% of sodium hydroxide (NaOH) solution for twelve hours in room temperature. The tensile properties of composites at different weight percentage (10,15,20 and 25%) were studied by using Instron Universal Testing Machine according to the standard ASTM D638. Impact test was conducted using an instrumented drop tower device at 10J incident energy level according to the standard ASTM D3763. The results of the study indicated that the epoxy resin reinforced with treated kenaf fibre exhibited higher tensile properties. On the other hand, the impact properties of polyester resin reinforced with treated kenaf fibre show better matrix bonding compared to those with epoxy resin matrices.

Effect of particle size on impact properties of epoxy resin filled with angular shaped silica particles

Polymer ◽  
1991 ◽  
Vol 32 (16) ◽  
pp. 2976-2979 ◽  
Author(s):  
Yoshinobu Nakamura ◽  
Miho Yamaguchi ◽  
Masayoshi Okubo ◽  
Tsunetaka Matsumoto
Keyword(s):  
Particle Size ◽  
Epoxy Resin ◽  
Silica Particles ◽  
Impact Properties ◽  
Effect Of Particle Size

scholarly journals Sustainable Boron Nitride Nanosheet-Reinforced Cellulose Nanofiber Composite Film with Improved Mechanical Properties and Oxygen Barrier without the Cost of Color and Brittleness

2018 ◽  
Author(s):  
Hoang-Linh Nguyen ◽  
Zahid Hanif ◽  
Seul-A. Park ◽  
Bong Gill Choi ◽  
Thang Hong Tran ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solution ◽  
Boron Nitride ◽  
Composite Film ◽  
Food Packaging ◽  
Color Change ◽  
Cellulose Nanofiber ◽  
Oxygen Barrier ◽  
Boron Nitride Nanosheet

Herein, we introduce a boron nitride nanosheet (BNNS)-reinforced cellulose nanofiber (CNF) film as a sustainable oxygen barrier film that can potentially be applied in food packaging. Most of commodity plastics are oxygen-permeable. CNF exhibits an ideal oxygen transmittance rate (OTR) of <1 cc/m2/day in highly controlled conditions. A CNF film typically fabricated by the air drying of a CNF aqueous solution reveals an OTR of 19.08 cc/m2/day. The addition of 0-5 wt% BNNS to the CNF dispersion before drying results in a composite film with highly improved OTR, 4.7 cc/m2/day, which is sufficient for meat and cheese packaging. BNNS as a 2D nanomaterial increases the pathway of oxygen gas and reduces the chances of pin-hole formation during film fabrication involving water drying. In addition, BNNS improves the mechanical properties of the CNF films (Young’s modulus and tensile strength) without significant elongation reductions, probably due to the good miscibility of CNF and BNNS in the aqueous solution. BNNS addition also produces negligible color change, which is important for film aesthetics. An in vitro cell experiment was performed to reveal the low cytotoxicity of the CNF/BNNS composite. This composite film has great potential as a sustainable high-performance food packaging material.

Optimization of Low-Velocity Impact Properties of E-Glass/Epoxy Composites Using Plasticizing Modifiers

2012 ◽  
Author(s):  
M. M. Rahman ◽  
N. Jahan ◽  
S. Zainuddin ◽  
M. V. Hosur ◽  
S. Jeelani ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Energy Absorption ◽  
Epoxy Composites ◽  
Low Velocity Impact ◽  
Resin System ◽  
Low Velocity ◽  
Flexure Strength ◽  
Impact Properties ◽  
Velocity Impact ◽  
Epoxy Resin System

The prime aim of this work is to enhance the energy absorbing capabilities of e-glass/epoxy composite under low velocity impact using plasticizing modifiers. Epoxy terminated polyol at 5–15 phr loading levels as plasticizing modifier was mixed into two-phase SC-15 epoxy resin system by a high speed mechanical stirrer. Modified epoxy resin system was then used to fabricate E-glass/epoxy composites by hot press processing. Low velocity impact test at two different energy levels was carried out to investigate the effectiveness of incorporating plasticizing modifier on impact properties of these composites. In addition, three point bend test was also conducted to examine the effects on flexure properties with plasticizing modifiers. Incorporation of epoxy terminated polyol in E-glass/epoxy laminates proved efficient with a significant improvement of 23% in impact energy absorption capability over control counterpart. On the other hand, flexure strength and modulus has been decreased upon polyol loading whereas failure strain has been increased. The flexible polymer chain of polyol group inserted between epoxy molecules by chemical reaction enhances the ductility of the composites and reduces the number of cross-linking. Hence, energy absorption capability or overall toughness was found to increase with a slight reduction of peak strength and flexure strength and stiffness.

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