Acrylic resin and organic silicon polymer materials both have excellent properties and are widely used in fields such as coatings, adhesives, electronic packaging, medical materials, etc. Acrylic resin has good film-forming properties, transparency, and adhesion, while silicone materials have excellent high temperature resistance, weather resistance, and low surface energy characteristics. However, due to the significant difference in molecular structure and poor compatibility between the two, direct blending can easily lead to phase separation and affect material properties. Therefore, studying how to improve the compatibility between acrylic resin and silicone materials is of great significance for the development of high-performance composite materials.


1、 Molecular Structure and Compatibility Analysis of Acrylic Resin and Organosilicon Materials
1.1 Structural characteristics of acrylic resin
Acrylic resin is a polymer material made by polymerizing acrylic acid and its ester monomers (such as methyl methacrylate, butyl acrylate, etc.). The molecular chain contains polar carboxyl and ester groups, which give it good adhesion and film-forming properties.


1.2 Structural characteristics of organic silicon polymers
The main chain of organic silicon polymers (such as polydimethylsiloxane, PDMS) is composed of Si-O bonds, and the side chains are organic groups (such as methyl, phenyl, etc.). The Si-O bond energy is high, endowing the material with excellent heat resistance and flexibility, but the non-polar organic side chains make it less compatible with polar polymers such as acrylic resin.


1.3 Factors affecting compatibility
Polarity difference: Acrylic resin has a stronger polarity, while organic silicon material has a lower polarity, which leads to phase separation when the two are mixed.


Surface energy difference: The surface energy of organic silicon materials (~20 mN/m) is much lower than that of acrylic resins (~40 mN/m), which affects interfacial bonding.


Molecular chain interaction: Acrylic resin molecules are prone to form hydrogen bonds between each other, while organic silicon molecules mainly rely on van der Waals forces between each other, resulting in weaker interactions.


2、 Methods for improving the compatibility between acrylic resin and organic silicon materials
2.1 Introduction of compatibilizers
Silane coupling agents can form chemical bonds between acrylic resin and organosilicon materials, improving interfacial adhesion.


Block or graft copolymers (such as acrylic organosilicon block copolymers) can reduce the tendency of phase separation and enhance compatibility.


2.2 Co polymerization modification
Introducing organic silicon monomers (such as vinyl triethoxysilane) into acrylic resin through copolymerization reaction to improve the compatibility between the two phases.


Adopting a core-shell structure design, with organic silicon material as the core and acrylic resin as the shell, to reduce phase separation.


2.3 Nanocomposite Technology
Add fillers such as nano SiO ₂ and nano clay to enhance the interfacial adhesion between the two phases.


The organic-inorganic hybrid materials were prepared by the sol-gel method to enhance the compatibility.