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- W3204753908 abstract "Abstract To improve the mechanical properties of polyaspartate polyurea (PAEP), functionalized nano‐silica reinforced polyurea composites were prepared. The original nano‐silica (O‐SiO 2 ) was treated with 3‐aminopropyltriethoxysilane (APTES), and the amino group at the end of APTES was used as the initiation site to realize the coating modification of poly(γ‐benzyl l ‐glutamate) (PBLG) onto O‐SiO 2 . The dispersion, wettability, and interfacial properties of functionalized nano‐silica (PBLG‐SiO 2 ) in PAEP were analyzed. The tensile and tear properties of PBLG‐SiO 2 /PAEP composites were tested, and the reinforcement mechanism was revealed. The results showed the dispersibility of PBLG‐SiO 2 in PAEP had been improved markedly. The contact angle of PBLG‐SiO 2 with PAEP was 29.31°, which was significantly lower than that of O‐SiO 2 (76.48°). The adhesion work between PBLG‐SiO 2 and PAEP was 97.16 mJ/m 2 , an increase of 51.7% compared with O‐SiO 2 . When the content of PBLG‐SiO 2 was 2 phr, the tensile strength, Young's modulus, and tear strength of PAEP composites reached the maximum of 17.43 MPa, 157.12 MPa, and 127.38 N/mm, an increase of 33.6%, 77.9%, and 71.3%, respectively, compared with pure PAEP. The analysis of cross‐section showed that the strengthening mechanism of PBLG‐SiO 2 on PAEP was mainly manifested by non‐planar cracks, deflection and bifurcation of cracks, and plastic deformation of PAEP matrix caused by peeling of PBLG‐SiO 2 from matrix." @default.
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- W3204753908 date "2021-09-27" @default.
- W3204753908 modified "2023-10-03" @default.
- W3204753908 title "Preparation and mechanical properties of poly(γ‐benzyl <scp>l</scp>‐glutamate) modified nano‐silica reinforced polyurea composites" @default.
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- W3204753908 doi "https://doi.org/10.1002/pat.5514" @default.
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