Interfacial shear strength of opaque resin/carbon fiber based on mapping from energy dispersive X‐ray spectroscopy

2020 ◽  
Vol 41 (6) ◽  
pp. 2134-2144 ◽  
Author(s):  
Tianshuai Ma ◽  
Xiaoyuan Pei ◽  
Liangsen Liu ◽  
Chunhong Wang ◽  
Liyan Liu ◽  
...  
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Energy Dispersive ◽  
X Ray

scholarly journals Lignin as a Functional Green Coating on Carbon Fiber Surface to Improve Interfacial Adhesion in Carbon Fiber Reinforced Polymers

Materials ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 159 ◽  
Author(s):  
László Szabó ◽  
Sari Imanishi ◽  
Fujie Tetsuo ◽  
Daisuke Hirose ◽  
Hisai Ueda ◽  
...  
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Interfacial Adhesion ◽  
Interfacial Shear Strength ◽  
Fiber Surface ◽  
Covalent Bond ◽  
Interfacial Shear ◽  
Fiber Reinforced ◽  
X Ray ◽  
Carbon Fiber Surface

While intensive efforts are made to prepare carbon fiber reinforced plastics from renewable sources, less emphasis is directed towards elaborating green approaches for carbon fiber surface modification to improve the interfacial adhesion in these composites. In this study, we covalently attach lignin, a renewable feedstock, to a graphitic surface for the first time. The covalent bond is established via aromatic anchoring groups with amine functions taking part in a nucleophilic displacement reaction with a tosylated lignin derivative. The successful grafting procedures were confirmed by cyclic voltammetry, X-ray photoelectron spectroscopy, and field emission scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. Both fragmentation and microdroplet tests were conducted to evaluate the interfacial shear strength of lignin coated carbon fiber samples embedded in a green cellulose propionate matrix and in a commercially used epoxy resin. The microdroplet test showed ~27% and ~65% increases in interfacial shear strength for the epoxy and cellulose propionate matrix, respectively. For the epoxy matrix covalent bond, it is expected to form with lignin, while for the cellulosic matrix hydrogen bond formation might take place; furthermore, plastisizing effects are also considered. Our study opens the gates for utilizing lignin coating to improve the shear tolerance of innovative composites.

Effect of Water Temperature on Interfacial Shear Strength of Resin Particles Added CFRTP

2018 ◽  
Vol 774 ◽  
pp. 7-12
Author(s):  
Hideaki Katogi ◽  
Kenichi Takemura ◽  
Mao Mochizuki
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Water Temperature ◽  
Room Temperature ◽  
Interfacial Shear Strength ◽  
Water Immersion ◽  
Interfacial Shear ◽  
Water Penetration ◽  
Resin Particle ◽  
Particle Addition

In this study, interfacial shear strength of resin particles added carbon fiber/maleic acid anhydride grafted polypropylene under water temperature was investigated. Water temperature range was from room temperature to 80 oC. The maximum immersion time was 24 hours. Micro debonding tests of non and resin particles added composites were conducted. Fracture surface of resin particles added composite were observed by Scanning Electron Microscope (SEM). As a result, interfacial shear strengths of non particles added composite monotonously decreased with an increase of water temperature. Interfacial shear strength of resin particles added composite was higher than that of non resin particles added composite under all water temperatures except for 50 oC. From SEM observation, large resin particles on surface of carbon fiber after water immersion at 50 oC were found. And, many matrices and large resin particles on surface of carbon fiber after water immersion at 80 oC were found. Therefore, interfacial shear strength of composite was improved because resin particle addition prevented water penetration into the interface between fiber and matrix under water immersion less than 50 oC. And, interfacial shear strength of composite was probably improved by anchor effect of resin particle under water immersion at 80 oC.

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