Compatibilization of immiscible ethylene-vinyl acetate copolymer/thermoplastic polyurethane blends by nano-silica particles grafted maleic anhydride
In this work, the nano-silica particles grafted maleic anhydride (SiO 2 -g-MAH) was designed to enhance the compatibility of the ethylene-vinyl acetate copolymer/thermoplastic polyurethane (EVA/TPU) immiscible blend system. The silane side chains on SiO 2 -g-MAH can physically entangle with the molecular chains of both EVA and TPU, while the maleic anhydride groups on the surface of SiO 2 -g-MAH can react with TPU to form crosslinking structures. This enables SiO 2 -g-MAH to anchor at the interface, enhances interfacial adhesion and improves significantly the compatibility of the EVA/TPU blends. As a result, the dispersed phase size of the blends significantly decreases, meanwhile, their adhesive and mechanical properties get noticeably improved. When the addition amount of SiO 2 -g-MAH is 2 wt%, the size of the TPU dispersed phase decreases from the original 3.38 ± 0.59 μm to 0.69 ± 0.05 μm, and the lap shear strength and tensile strength of the blend reach respectively 8.76 MPa and 15.51 MPa, representing enhancements of 159.2 % and 45.1 % compared to the EVA/TPU blends without SiO 2 -g-MAH.
危险品化学品经营许可证（带存储）