Interfacial Anchoring Behavior And Compatibilization Of Double Spherical Janus Particles To Acrylic Resin/Epoxy Resin Composites

Because of its special chemical composition and structure,Janus materials have broad application prospects in biomedicine,optoelectronics,magnetics,oil-water separation,phase interface control and other fields.Different chemical compositions of anisotropic double-spherical Janus particles at both lobes can produce physical interaction or chemical bonding force with the two phases of blends respectively.The double-spherical neck is anchored at the interface of the two phases.The Janus particles hinder the development of the crack front under the external force,thus playing the role of compatibilization,toughening and strengthening.In this paper,the SiO₂ lobe of double spherical organic-inorganic composite SiO₂@PDVB Janus particles was modified by Triethylenetetramine?TETA?in order to adjust its hydrophilic-lipophilic equilibrium value.The Janus particles were used as compatibilizers of acrylic resin and epoxy resin?EP?and its interfacial anchoring behavior and compatibilization were investigated,as compared with isotropic SiO₂ microspheres.1?SiO₂ particles with different particle sizes were prepared,and TETA was grafted onto the surface of SiO₂ particles.SiO₂ and SiO₂-TETA particles had barrier effect to heat and light,and could improve the heat and ultraviolet resistance of EP matrix.Both of them could physically entangle or formed chemical bonds with EP,increased the bonding point between EP molecular chains,and heightened its storage modulus and glass transition temperature.The effect of SiO₂-TETA containing active hydrogen atoms was more obvious.Both SiO₂ and SiO₂-TETA particles had toughening and reinforcing effects on EP.The toughening effect of 100 nm SiO₂ particles on EP was better than that of 300 and 500 nm SiO₂ particles on EP.The toughening effect of modified 100 nm SiO₂-TETA particles on EP was stronger than that of unmodified SiO₂ particles.When the particle size of SiO₂ and SiO₂-TETA is 100 nm and the addition amount was 3%,the impact strength of EP composites were 15.01 kJ/m² and 16.26 kJ/m² respectively,which were 17.85%and 27.67%higher than pure EP.2?With isotropic SiO₂,SiO₂-TETA nanoparticles and anisotropic SiO₂@PDVB,TETA-SiO₂@PDVB Janus particles as toughener and compatibilizer of thermoplastic acrylic resin?AR?/EP composites.The results showed that SiO₂ and SiO₂-TETA nanoparticles regulated the dispersed phase domain size of AR.SiO₂ and SiO₂-TETA particles could widen the AR domain distribution of dispersed phase.When subjected to external impact,small size and large size AR play the role of cavitation and passivation respectively.SiO₂@PDVB Janus particles did not form chemical bonds with AR/EP composites,and the compatibilization effect was poor.The lobe of TETA-SiO₂ could crosslinked with EP and TETA-SiO₂@PDVB Janus particles were embedded in the interface of AR and EP.TETA-SiO₂@PDVB Janus particles enhanced the interfacial adhesion between AR and EP,inhibited the coarsening and aggregation of AR phase,and reduced the domain phase just like an anchor.2%SiO₂,SiO₂-TETA and 3%SiO₂@PDVB and TETA-SiO₂@PDVB Janus endowed AR/EP composites the best impact,tensile and anti-aging properties.The anisotropic TETA-SiO₂@PDVB Janus particles had the most obvious effect on the impact,tensile and aging resistance of AR/EP composites.The impact strength and tensile strength of AR/EP composites were 161.7%and 36.6%higher than those of AR/EP composites,respectively.3?TETA-SiO₂@PDVB Janus particles were used as compatibilizers of thermosetting hydroxyl acrylic resin?HAR?/EP composites.The addition of TETA-SiO₂@PDVB Janus particles could hinder the growth of cracks of blends and produce plastic deformation to absorb external impact energy.When the TETA-SiO₂@PDVB Janus particle content was2%,the impact strength of H₅₀AR/EP and H₂₈AR/EP composites reaches the maximum,which were 15.17 kJ/m² and 17.62 kJ/m²,respectively.H₅₀AR/EP and H₂₈AR/EP composites had good weatherability.The glossiness and weatherability of H₅₀AR/EP and H₂₈AR/EP composites could be further improved by adding TETA-SiO₂@PDVB Janus particles.This paper will provide experimental and theoretical basis for the use of anisotropic Janus particles as compatibilizers for blends with the same or similar polarity.