EVALUATION OF EFFECT OF SURFACE MODIFICATION ON CORRELATION BETWEEN PERMEABILITY OF GLASS FIBER/RESIN AND CAPILLARY NUMBER

2021 ◽  
Author(s):  
TAKUYA SAITO ◽  
KENJI MIZUTANI ◽  
HIROSHI SAITO ◽  
ISAO KIMPARA
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Capillary Number ◽  
Silane Coupling Agent ◽  
Fiber Bundles ◽  
Resin Flow ◽  
Glass Cloth ◽  
Resin Impregnation ◽  
Silane Coupling ◽  
Effect Of Surface

In this study, we experimentally evaluated the correlation between the microscopic resin flow and permeability of a glass cloth, which surface was modified by silane coupling agent. We focused on the capillary number, which is a parameter determining the microscopic resin impregnation behavior within and between fiber bundles. The capillary numbers were classified into different parameters based on their dependency on temperatures and pressures. First, we obtained the temperature condition for each resin, to make the ratio between resin viscosity and (surface tension ・contact angle), constant be Under these temperature conditions, the pressure conditions were determined to be the resin impregnation rate constant. The permeability was evaluated with three types of resins under three conditions of capillary numbers. As a result, the permeabilities of the different resin systems were approximately equal. Therefore, it was found that the macroscopic permeability was not significantly influenced by the capillary number representing microscopic resin flow.

scholarly journals Comparison of Surface Modification Methods for Improving the Compatibility of Recycled Plastic Film-Based Aggregates

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3956
Author(s):  
Jea Uk Lee ◽  
Jin-Yong Hong
Keyword(s):  
Contact Angle ◽  
Surface Modification ◽  
Coupling Agent ◽  
Atmospheric Pressure ◽  
Silane Coupling Agent ◽  
Atmospheric Pressure Plasma ◽  
Ozone Treatment ◽  
Plastic Film ◽  
Pressure Plasma ◽  
Silane Coupling

The surface modification of recycled plastic film-based aggregates was investigated to improve the compatibility between the aggregates and a cement paste. Surface modification was performed using ultraviolet–ozone treatment (UV-O3), a silane coupling agent, O2 atmospheric pressure plasma, and acrylic binder coating methods. The surface properties of the modified aggregates were analyzed using a contact angle measuring instrument. The results revealed that for all surface modification methods, the contact angle decreased with an increase in the treatment time. According to the comparative evaluation results of the changes in the surface characteristics of the aggregates through various surface modification methods, the contact angle reduction rates were 58.9%, 51.4%, 25.5%, and 24.5% for the O2 atmospheric pressure plasma, the acrylic binder coating, the silane coupling agent, and the UV-O3 method, respectively. After 48 h, the contact angle had increased by 110.9%, 29.9%, 16.4%, and 5.9% for the O2 atmospheric pressure plasma, UV-O3, the silane coupling agent, and the acrylic binder coating, respectively. Namely, the surface modification using the acrylic binder coating method was found to be the most effective method in terms of the wettability increase effect and the long-term storage stability.

Design of Experiment: A Statistical Approach to Understanding Factors Influencing Surface Properties of Sol-Gel Based Non-Stick Ceramic Coatings

2012 ◽  
Vol 622-623 ◽  
pp. 420-425
Author(s):  
Alex Kwasi Kumi ◽  
Allan Chelashaw ◽  
Yu Mei Zhang ◽  
Li Feng Li
Keyword(s):  
Contact Angle ◽  
Surface Properties ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Sol Gel ◽  
Ceramic Coatings ◽  
Curing Temperature ◽  
Factors Influencing ◽  
Silane Coupling ◽  
Advancing Contact Angle

Ceramic coatings based on sol-gel method have increasingly gained much attention in recent times. In order to ascertain important experimental factors (variables) influencing surface properties, such as adhesion, pencil hardness and advancing contact angle (non-stick) of sol coatings, a 26-1-factorial screening design with six experimental variables, precursor mole ratio, low surface energy polymer concentration, silane coupling agent (SCA) concentration, silica nanoparticles concentration (SNP’s),curing temperature and three responses ( surface properties) were investigated. The results indicate that silane coupling agent concentration, SNP’s concentration and their interaction were the most significant experimental factors influencing advancing contact angle. None of the experimental factors studied were statistically significant with respect to hardness and adhesion.

Study on UV-protection and hydrophobic properties of cotton fabric functionalized by graphene oxide and silane coupling agent

2019 ◽  
Vol 48 (3) ◽  
pp. 237-242 ◽  
Author(s):  
Feilong Shi ◽  
Jia Xu ◽  
Zhanzhu Zhang
Keyword(s):  
Contact Angle ◽  
Graphene Oxide ◽  
Cotton Fabric ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Uv Protection ◽  
Curing Temperature ◽  
Hydrophobic Properties ◽  
Content Type ◽  
Silane Coupling

Purpose This study aims to prepare UV protection and hydrophobic fabric through modifying cotton fabric by graphene oxide and silane coupling agent. The graphene oxide and silane coupling agent (KH570) are anchored on the cotton fabric by a stable chemical bond. Design/methodology/approach Graphene oxide was prepared by modified Hummers method. The fabric sample was treated with graphene oxide and silane coupling agent KH570 using simple dipping-padding-drying method. The effects of the dosage of graphene oxide, silane coupling agent KH570 and curing temperature were determined by single variable experiment and orthogonal experiment, The UVA and UVB transmittances in ultraviolet light of the sample fabric were characterized, and the contact angle test method with water was used to indicate the hydrophobicity of the sample fabric. The structure and surface of the fabric were analyzed using Fourier-transform infrared spectroscopy and scanning electron microscopy. Findings The cotton fabric was successfully modified by graphene oxide and silane coupling agent KH570. Compared with the untreated fabric, the surface of the fabric was smooth, and there was no gap on the fiber. The graphene oxide, silane coupling agent KH570 and cotton fabric combined tightly. The UPF value of the modified fabric was 50+, and the contact angle reached 138.1°. It had excellent UV protection and hydrophobic properties. Research limitations/implications Although graphene oxide and silane coupling agents KH570 had successfully endowed the cotton fabric with good UV protection and hydrophobic properties, graphene oxide and silane coupling agent KH570 are expensive and used in large quantities. There are certain limitations in the actual life and production process. Practical implications After treating with silane coupling agent, the hydrophilic fabric treated with graphene oxide is being translated into hydrophobic, and graphene oxide bonded with cotton. The modified fabrics also have excellent UV protection. This fabric can be used for outdoor sports such as clothes and tents. Originality/value Cotton fabric treated with graphene oxide generally by simple dip-dry-cure method is hydrophilic and graphene oxide is easy to drop. The usage of silane coupling agent KH570 as a crosslinking agent to link graphene oxide and cotton fibers has not been reported yet. The modified fabrics have both UV protection and hydrophobic properties.

Surface Hydrophobic Modification of T-ZnOw with Silane Coupling Agent

2013 ◽  
Vol 634-638 ◽  
pp. 3048-3051
Author(s):  
Zhong Yuan Wu ◽  
Liang Hu ◽  
Jia Xi Chen
Keyword(s):  
Contact Angle ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Liquid Paraffin ◽  
Distilled Water ◽  
Hydrophobic Modification ◽  
Silane Coupling Agents ◽  
Silane Coupling ◽  
Ft Ir ◽  
Settling Rates

Surface hydrophobic modification of T-ZnOw was experimented with silane coupling agent KH-570(gamma-(methylpropyl acyloxy)trimethoxysilane). It was shown by FT-IR that the whiskers was modified by silane coupling agents molecular compounded with the Zn-OH of whiskers. The effect of grafted modification with KH570 on hydrophobicity of T-ZnOw was characterized with dispersion stability test in an organic solvent and measuring the contact angle between the whiskers on distilled water. The results showed that surface treatment of T-ZnOw with KH570 improves hydrophobicity of whiskers simultaneously, and the modified whiskers have much slower settling rates than the pristine whiskers in the liquid paraffin. The contact angle between the modified whiskers with distilled water is 137.75 degrees, which is a significant increase.

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