| Glass fiber-reinforced epoxy resin (GF/EP) composites have been widely used in many fields because of their excellent mechancial properties covering specific strength, specific modulus, mechanical, and process ability, such as aviation, automotive, shipbuilding, and athletic equipment manufacturing. In these years, more and more attention is being paid to the application of GF/EP composites in ground effect aircraft.On the base of this, in this paper, GF/EP composites are selected to modify its surface and interface properties for its application of ground effect aircraft. At the same time, the amount of microorganisms attachment on different surfaces are investigated. The main results of this study are as follows:The optimum ratio and non-isothermal curing kinetics of epoxy resin (EP2008)/hardener (EP2008-S) system are studied by using Differential Scanning Calorimetry (DSC). In view of the gel time, viscosity and curing reaction heat, the optimum ratio of m (EP2008)/m (EP2008-S) can be confirmed as 100:20. Non-isothermal curing kinetics of m (EP2008)/m (EP2008-S) is investigated by dynamic DSC. The kinetics mechanism function is analyzed with the nth-order model and two-parameter (m and n) autocatalytic model (Sestak-Berggren model), respectively. Results indicate that the Malek method discloses the autocatalytic behavior, and two-parameter autocatalytic model is able to well simulate the curing reaction. Through the analysis of chemical composition of EP2008/EP2008-S and the value of E, the possible curing reaction mechanism may be the intermolecular catalytic effect of amino and phenolic hydroxy towards epoxy groups.GF/EP composites containing high amounts of silane coupling agent y-glycidyloxipropyltrimethoxysilane (GPTMS) are developed by hand lay-up method. Experiment results indicate that the introduction of 5wt% GPTMS improve the tensile strength, glass transition temperature, friction and wear, hardness, and water absorption behaviours. This is because that the introduction of GPTMS improves the cross-link density of the polymeric network and the bonding of interface between glass fiber and epoxy. However, with the amount of GPTMS increasing, the adhesion ability of epoxy matrix decrease and the properties of composites above-mentioned begin to decrease. Interestingly, the brittle-tough transition phenomenon is observed in tensile test for composites adding 10wt% and 15wt% GPTMS into epoxy. Which can be explained by the variation of free volume. In addition, the equilibrium water content also depends on the number of polar groups.A facile method is reported for the preparation of superhydrophobic GF/EP composites surfaces with controlled adhesion. By simply adjusting the content of CaCO3 and SiO2 of surface coating, after surface treatment, we can obtain the different GF/EP composites surfaces with diverse morphologies. The results confirm that GF/EP composites samples not only can achieve superhydrophobicity but also present huge differences in adhesive abilities. The "microlens" surface presents a strong sticky performance which can hold a 10 μL water droplet even tilted vertically or turned upside down. Such property is very similar to the "rose petal effect". In comparison, the "microbowls" surface presents a slippery property which can be regarded as lotus effect. The water roll-off angle is as low as of approximately 9°. At the same time, the adhesion work of the surfaces is decreased from extreme high (34.7 mN/m) to very low (7.9 mN/m). Noticeably, the heat-resistance and anti-friction of the "microbowls" surface are better than that of the "microlens".The superhydrophobic GF/EP composites surfaces are prepared by spray coating a mixture. The mixture is comprised of EP2008, EP2008-S, hydrophobic silica nanoparticles (HSNPs), and acetone. By simply controlling the concentration of HSNPs in the mixture, the tunable adhesive superhydrophobic surfaces can be obtained. The results confirm that the as-prepared samples not only can achieve superhydrophobicity but also present huge differences in adhesive abilities. Noticeably, the superhydrophobic GF/EP composites surfaces can keep the excellent stability in many kinds of solvents for 3 days, such as water (25℃), toluene, acetone, tetrahydrofuran, and ethanol. In addition, water droplets with different pH (1-14) have similar contact angles and adhesion on the surfaces, indicating that these surfaces are chemical resistant to acid and alkali. Furthermore, after being stored in ambient environment for six months, no obvious decrease in water contact angle (CA) is observed. Moreover, the damaged surfaces could be restored completely after spray coating again.The amount of microorganisms attachment have great impact on marine vessels and engineering facilities, resulting in huge losses to the development of marine economy and security risks. In this paper, the attachment of materials surface with different wettability is investigated for different microorganisms. There is no significant difference in the amount of attachment on hydrophilic, hydrophobic and superhydrophobic GF/EP composites for pseudomonas aeruginosa. However, forcandida albicans, the amount of attachment on superhydrophobic GF/EP composites decreases 80% relative to hydrophilic GF/EP composites. |
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