Abstract
The objective of the study was to investigate the effect of the method of synthesis on properties of aqueous hybrid silicone-acrylic (SIL-ACR) and acrylic-silicone (ACR-SIL) dispersions. SIL-ACR dispersions were obtained by emulsion polymerization of mixtures of acrylic and styrene monomers (butyl acrylate, styrene, acrylic acid and methacrylamide) of two different compositions in aqueous dispersions of silicone resins synthesized from mixtures of silicone monomers (octamethylcyclotetrasiloxane, vinyltriethoxysilane and methyltriethoxysilane) of two different compositions. ACR-SIL dispersions were obtained by emulsion polymerization of mixtures of the same silicone monomers in aqueous dispersions of acrylic/styrene copolymers synthesized from the same mixtures of acrylic and styrene monomers, so the compositions of ACR and SIL parts in corresponding ACR-SIL and SIL-ACR hybrid dispersions were the same. Examination of the properties of hybrid dispersions (particle size, particle structure, minimum film forming temperature, Tg of dispersion solids) as well as of corresponding coatings (contact angle, water resistance, water vapour permeability, impact resistance, elasticity) and films (tensile strength, elongation at break, % swell in toluene), revealed that they depended on the method of dispersion synthesis that led to different dispersion particle structures and on composition of ACR and SIL part. Generally, coatings produced from hybrid dispersions showed much better properties than coatings made from starting acrylic/styrene copolymer dispersions.
Highlights
Aqueous polymer dispersions are currently produced in quantities exceeding globally 20 million tons per annum [1] and are commonly used, inter alia, as binders for organic coatings, especially for aqueous dispersion-based architectural paints
For coatings and films produced from starting dispersion ACR B and hybrid coatings and films where ACR B composition of monomers was applied in synthesis of the relevant dispersions, the Simultaneous synthesis of aqueous silicone-acrylic and acrylic-silicone hybrid dispersions results of mechanical tests were much less convincing, presumably because Tg of ACR B was quite (SIL-ACR and ACR-SIL) by (1) emulsion polymerization of acrylic/styrene monomers
Cupping test results were good for all coatings and in direct elasticity and MA) mixtures of different composition (ACR A and ACR B) in aqueous dispersions of silicone measurements, only coatings produced from starting dispersion ACR B failed
Summary
Aqueous polymer dispersions are currently produced in quantities exceeding globally 20 million tons per annum [1] and are commonly used, inter alia, as binders for organic coatings, especially for aqueous dispersion-based architectural paints. (It is worth to note that generally a âhybrid materialâ is a material that is composed of at least two note that generally a âhybrid materialâ is a material that is composed of at least two components components mixed at molecular scale [2] and this term is normally used for polymermixed at molecular scale [2] and this term is normally used for polymer-inorganic structure inorganic structure composites [3], it can be applied to polymer-polymer systems) structure (i.e., composites [3], it can be applied to polymer-polymer systems) structure (i.e., are composed of at are composed of at least two different polymers) and their diameter is less than 100 nm they may be least two different polymers) and their diameter is less than 100 nm they may be called âdispersion called âdispersion nanoparticles with hybrid structureâ within which the occurrence of specific nanoparticles with hybrid structureâ within which the occurrence of specific interactions between interactions between these polymers optionally leading to synergistic effect may be expected These polymers optionally leading to synergistic effect may be expected. Due to a synergistic due to a synergistic effect, new and sometimes quite unexpected features of coatings or films made effect, new and sometimes quite unexpected features of coatings or films made using such hybrid using such hybrid dispersions as binders may be foundâsee Figure 1.
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