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Interface Properties of Epoxy and Polyurethane Mutually Sized Carbon Fiber Reinforced Composites
Shengxia Li,Changling Yang,Lili Yao,Bo Wu,Yonggen Lu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.3
Anodized carbon fiber (OCF) is sized with epoxy sizing agent (EPS) and polyurethane sizing agent (PUS) toreinforce epoxy resin (EP) and polyurethane resin (PU) mutually. The dependence of interlaminar shear strength (ILSS) andfailure strain on the sizing agent and amount is investigated. The ILSS of the as-received OCF reinforced EP composite is59.5 MPa, while that of EPS sized OCF reinforced EP composite can be optimally increased to 66.7 MPa, and that of PUSsized OCF reinforced EP composite can be increased maximumly to 72.8 MPa. The ILSS of the as-received OCF reinforcedPU composite is 39.5 MPa, while that of PUS sized OCF reinforced PU composite can be optimally increased to 50.5 MPa,and that of EPS sized OCF reinforced PU composite can be increased maximumly to 63.9 MPa. The results show the EPS ismore suitable to size OCF for reinforcing PU while the PUS is more suitable to size OCF for reinforcing EP. Hence it isconcluded that the law of similarity and intermiscibility does not always work, rather the chemical reactions are moreimportant for strong interface formation. The sizing amount has a great influence on both the ILSS and failure strain.
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Suyuan Zeng,Rongfeng Tang,Huaifen Su,Shengxia Duan,Yuanwei Sun,Lei Li,Dezhi Sun 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.4
In this report, an inorganic salt assisted micro-emulsion method was reported for the preparation of mono-disperse CaWO4 microspheres with hierarchical structures. The as-obtained microspheres are composed of tiny nanorods, which have been proved by the field emission scanning electronic microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM) observations. The formation of these hierarchical mono-disperse microspheres is considered to be the synergistic effect of both surfactant and the inorganic salt. Based on the time-dependent experiments, a probable formation mechanism based on surface adsorption and oriented attachment has been proposed. The photoluminescence properties of the microspheres were investigated. The generality of this synthetic method for other metal tungstates were also carefully investigated, which indicates that the morphologies of the final product not only depend on the synthetic conditions, but also depend on the growth habit of the materials.
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