Curing Temperature Effects on Network Structure and Chemistry of Silane Coupling Agent Layers and Their Influence on Water-Assisted Crack Growth

Abstract 1. A silane coupling agent (Si-69) reduces the viscosity and increases the scorch lime in silica- and clay-filled EPDM. The cure lime of silica-filled mixes remained unchanged and that of clay-filled mixes increased on addition of Si-69. 2. In the presence of Si-69, the silica-EPDM system exhibits higher polymer-filler interaction than the clay-EPDM system. 3. Vulcanizates containing Si-69 exhibit higher apparent crosslink density and a higher proportion of polysulfidic crosslinks than the control vulcanizates. 4. Vulcanizates containing Si-69 show improved physical properties. Lower tensile and tear properties in vulcanizates with Si-69 at higher filler loadings is explained via a slippage mechanism. 5. SEM studies of fractured surfaces created under tension, tear, flexing, and abrasion have been made, and changes in the strength of the vulcanizates have been correlated with the fractographs.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.622-623.420 ◽

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.

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

Pigment & Resin Technology ◽

10.1108/prt-09-2018-0098 ◽

2019 ◽

Vol 48 (3) ◽

pp. 237-242 ◽

Cited By ~ 1

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.

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Effect of Reinforcing Silica on Vulcanization, Network Structure, and Technical Properties of Natural Rubber

Rubber Chemistry and Technology ◽

10.5254/1.3535935 ◽

1982 ◽

Vol 55 (5) ◽

pp. 1370-1388 ◽

Cited By ~ 54

Author(s):

P. K. Pal ◽

S. K. De

Keyword(s):

Network Structure ◽

Coupling Agent ◽

Silane Coupling Agent ◽

Scanning Electron Micrographs ◽

Polymer Filler ◽

Silica Filler ◽

Silane Coupling ◽

Aging Resistance ◽

Failure Properties ◽

Technical Properties

Abstract Reinforcement of silica filler in NR in the presence of a silane coupling agent (Si-69), and an additive (TEA) has been analyzed by studies on swelling of the vulcanizate, network structure, technical properties, and scanning electron micrographs. Failure properties in the presence of a coupling agent have been explained on the basis of coupling (polymer-filler) bonds. Improved flex endurance in the presence of TEA has been explained on the basis of good dispersion and better aging resistance of the TEA compounds. Network structure of the rubber during vulcanization undergoes only minor changes on addition of silica filler in the presence of both coupling agent and additive.

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Hydrophilic carrageenan functionalized magnetic carbon‐based framework linked by silane coupling agent for the enrichment of N ‐glycopeptides from human saliva

Journal of Separation Science ◽

10.1002/jssc.202001216 ◽

2021 ◽

Author(s):

Xueting Jin ◽

Canhong Zhu ◽

Jiani Wu ◽

Yinghua Yan ◽

Chuan‐Fan Ding ◽

...

Keyword(s):

Coupling Agent ◽

Silane Coupling Agent ◽

Human Saliva ◽

Silane Coupling ◽

Magnetic Carbon ◽

Carbon Based

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Improved Hydrophobicity of Macroalgae Biopolymer Film Incorporated with Kenaf Derived CNF Using Silane Coupling Agent

Molecules ◽

10.3390/molecules26082254 ◽

2021 ◽

Vol 26 (8) ◽

pp. 2254

Author(s):

Adeleke A. Oyekanmi ◽

N. I. Saharudin ◽

Che Mohamad Hazwan ◽

Abdul Khalil H. P. S. ◽

Niyi G. Olaiya ◽

...

Keyword(s):

Thermal Stability ◽

Coupling Agent ◽

Silane Coupling Agent ◽

Cellulose Nanofibrils ◽

Hydroxyl Groups ◽

Water Contact ◽

Silane Coupling ◽

Cnf Films ◽

Kenaf Bast ◽

Thermal Stability Of

Hydrophilic behaviour of carrageenan macroalgae biopolymer, due to hydroxyl groups, has limited its applications, especially for packaging. In this study, macroalgae were reinforced with cellulose nanofibrils (CNFs) isolated from kenaf bast fibres. The macroalgae CNF film was after that treated with silane for hydrophobicity enhancement. The wettability and functional properties of unmodified macroalgae CNF films were compared with silane-modified macroalgae CNF films. Characterisation of the unmodified and modified biopolymers films was investigated. The atomic force microscope (AFM), SEM morphology, tensile properties, water contact angle, and thermal behaviour of the biofilms showed that the incorporation of Kenaf bast CNF remarkably increased the strength, moisture resistance, and thermal stability of the macroalgae biopolymer films. Moreover, the films’ modification using a silane coupling agent further enhanced the strength and thermal stability of the films apart from improved water-resistance of the biopolymer films compared to unmodified films. The morphology and AFM showed good interfacial interaction of the components of the biopolymer films. The modified biopolymer films exhibited significantly improved hydrophobic properties compared to the unmodified films due to the enhanced dispersion resulting from the silane treatment. The improved biopolymer films can potentially be utilised as packaging materials.

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