Improvement of interfacial adhesion for plasma-treated aramid fiber-reinforced poly(phthalazinone ether sulfone ketone) composite and fiber surface aging effects

2008 ◽  
Vol 41 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Ping Chen ◽  
Jing Wang ◽  
Baichen Wang ◽  
Wei Li ◽  
Chengshuang Zhang ◽  
...  
Keyword(s):  
Interfacial Adhesion ◽  
Fiber Surface ◽  
Aramid Fiber ◽  
Fiber Reinforced ◽  
Aging Effects

Sulfone-functionalized poly(p-phenylene terephthalamide) copolymer fibers with improved interfacial adhesion to epoxy matrices

2021 ◽  
pp. 095400832110089
Author(s):  
Ting Li ◽  
Zengxiao Wang ◽  
Hao Zhang ◽  
Yutong Cao ◽  
Zuming Hu ◽  
...  
Keyword(s):  
Interfacial Adhesion ◽  
Interfacial Shear Strength ◽  
Aramid Fiber ◽  
Fiber Reinforced Composites ◽  
Epoxy Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Regular Arrangement ◽  
Epoxy Matrices ◽  
Polymerization Conditions

The poor interfacial adhesion of aramid fiber and matrix limits the application of the final composites. In this study, a series of the sulfone-functionalized poly( p-phenylene terephthalamide) (SPPTA) copolymers were satisfactorily synthesized and the effects of polymerization conditions (contents of the additional monomer and the cosolvent LiCl, molar concentration and ratio of the monomer, reaction temperature and time) on the molecular weight of the copolymer were discussed. The introduction of the sulfone group in aromatic polyamides not only increased the polarity of poly( p-phenylene terephthalamide) (PPTA) but destroyed the regular arrangement of the molecular chains, which greatly improved the surface free energy and the solubility of the polymers in organic solvents. The polymer maintained excellent thermal and interfacial properties. Compared with the PPTA fiber/epoxy composites, the interfacial shear strength (IFSS) of SPPTA fiber-reinforced epoxy composites reached 43.5 MPa, with a significantly enhancement of 20.8%, implying that the study provided an effective method to achieve highly interfacial adhesion of aramid fiber-reinforced composites.

Influence of Oxygen Plasma Treatment on Surface Properties of Armos Fiber

2008 ◽  
Vol 373-374 ◽  
pp. 430-433 ◽  
Author(s):  
Ping Chen ◽  
Jing Wang ◽  
Cheng Shuang Zhang ◽  
Chun Lu ◽  
Zhen Feng Ding ◽  
...  
Keyword(s):  
Surface Energy ◽  
Plasma Treatment ◽  
Functional Groups ◽  
Interfacial Adhesion ◽  
Oxygen Plasma ◽  
Treatment Time ◽  
Fiber Surface ◽  
Aramid Fiber ◽  
Oxygen Plasma Treatment ◽  
Polar Functional Groups

Armos fiber (F-12 aramid fiber in paper) was provided with broad application foreground as reinforcement material for advanced composites in aviation and spaceflight field, due to its outstanding properties, such as high modulus, high strength, high temperature resistance, erosion resistance and so on. However, the exertion of property was still limited by slippery surface, low surface energy and weak interfacial adhesion performance. In this study, the effects of oxygen plasma treatment time on polar functional groups introduced onto the fiber surface, surface free energy and surface topographic images were discussed by X-ray photoelectron spectroscopy (XPS) analysis, dynamic contact angle analysis system (DCA) and atomic force microscopy (AFM), respectively. It was found that the content of oxygen element and polar functional groups on fiber surface were all increased obviously after oxygen plasma treatment. The content of oxygen element on surface for untreated F-12 aramid fiber was 11.13%, while it increased to 15.20% after oxygen plasma treatment for 10 min; The content of polar functional groups on surface for untreated F-12 aramid fiber was 28.14%, while it increased to 38.11% after oxygen plasma treatment for 10 min. The polar component (γp) of fiber surface energy increased sharply from 6.82 mN/m to 36.68 mN/m after 10 min plasma treatment, the total surface free energy was increased from 46.26 mN/m to 64.66 mN/m.The results indicated that oxygen plasma treatment had introduced a large amount of reactive functional groups onto the fiber surface, and these groups can form together as covalent bonding to improve the surface wettability and increase the surface energy of fibers. At the same time, oxygen plasma treatment was able to generate a mass of bulges and grooves on F-12 aramid fiber surface, which had an active effect on increasing the chemical bond and mechanical function between fiber and resin and enhancing the interfacial adhesion performance of composite. The fiber surface grooves had been increased with the time prolonging before 10 min while decreased after 10 min, the results maybe relate to partial organic on fiber surface melting. It had an adverse effect on the interfacial adhesion properties of composite. Therefore, the optimum plasma treatment time was between 5 min and 10 min.

Natural Fiber Reinforced Polystyrene Matrix Based Composites

2010 ◽  
Vol 123-125 ◽  
pp. 1175-1178 ◽  
Author(s):  
Amar Singh Singha ◽  
Raj K. Rana ◽  
Ashvinder Rana
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Interfacial Adhesion ◽  
Graft Copolymerization ◽  
Natural Fiber ◽  
Fiber Surface ◽  
Fiber Reinforced ◽  
Polystyrene Matrix ◽  
Polystyrene Resin ◽  
Scanning Electron

The present study deals with the preparation of natural fiber reinforced polystyrene composites by compression molding technique in which good interfacial adhesion is generated by fiber surface modification. The fiber surface was modified through graft copolymerization of methyl methacrylate onto the fiber surface. The short grafted fibers were then spread between the alternate layers of polystyrene resin by hand lay up method to obtain the composites. The samples of the composites thus prepared were characterized by FTIR spectroscopy, scanning electron microscopy and thermogravimetric analysis. The composites were then evaluated for mechanical properties like tensile strength, compressive strength, flexural strength and wear resistance etc.

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.

scholarly journals Modeling of Bridging Law for Bundled Aramid Fiber-Reinforced Cementitious Composite and its Adaptability in Crack Width Evaluation

Materials ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 179
Author(s):  
Daiki Sunaga ◽  
Takumi Koba ◽  
Toshiyuki Kanakubo
Keyword(s):  
Fiber Orientation ◽  
Crack Width ◽  
Volume Fraction ◽  
Characteristic Point ◽  
Crack Opening ◽  
Aramid Fiber ◽  
Cementitious Composite ◽  
Fiber Reinforced ◽  
Cross Sectional ◽  
Bridging Law

Tensile performance of fiber-reinforced cementitious composite (FRCC) after first cracking is characterized by fiber-bridging stress–crack width relationships called bridging law. The bridging law can be calculated by an integral calculus of forces carried by individual fibers, considering the fiber orientation. The objective of this study was to propose a simplified model of bridging law for bundled aramid fiber, considering fiber orientation for the practical use. By using the pullout characteristic of bundled aramid fiber obtained in the previous study, the bridging laws were calculated for various cases of fiber orientation. The calculated results were expressed by a bilinear model, and each characteristic point is expressed by the function of fiber-orientation intensity. After that, uniaxial tension tests of steel reinforced aramid-FRCC prism specimens were conducted to obtain the crack-opening behavior and confirm the adaptability of the modeled bridging laws in crack-width evaluation. The experimental parameters are cross-sectional dimensions of specimens and volume fraction of fiber. The test results are compared with the theoretical curves calculated by using the modeled bridging law and show good agreements in each parameter.

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