Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Covalent bonding of the extruded polystyrene foams to mortar through ultraviolet-ozone irradiation
Highlights The construction of inherent reactive XPSF surface by ultraviolet-zone. The fabrication of covalently bonded XPSF/mortar interfaces. The thorough investigation of the reactions between APTES and XPSF surface.
Abstract The inert surface of extruded polystyrene foams (XPSF) was activated by ultraviolet-ozone (UVO) for the first time to improve the interfacial compatibility with mortar. From the structural analysis (X-ray photoelectron spectroscopic (XPS) and contact angle (CA)), it was suggested that a 10 min UVO exposure was efficient enough to introduce oxygen-contained elements (such as carboxyl groups) upon the obtained UVO-XPSF surface, leading to the increased bonding strength (BS) from 0.058 MPa of neat XPSF/mortar composites to 0.088 MPa. Then, 3-aminopropyl triethoxysilane (APTES) was selected as the promoter to further enhance the BS value of XPSF/mortar composites. The presence of the silane was confirmed by CA, Fourier transform infrared-attenuated total reflection (FTIR-ATR) and XPS. By optimizing the reaction conditions (activation and reaction time: 7 and 3 min, concentration of APTES: 2% and pH value of the silane solution: 10), a maximum BS of 0.168 MPa could be obtained. Through the mechanism analysis, it was demonstrated that APTES acted as a chemical bridge that covalently jointed XPSF by the formation of amide peptide and inorganic mortar by the condensation of silanols.
Covalent bonding of the extruded polystyrene foams to mortar through ultraviolet-ozone irradiation
Highlights The construction of inherent reactive XPSF surface by ultraviolet-zone. The fabrication of covalently bonded XPSF/mortar interfaces. The thorough investigation of the reactions between APTES and XPSF surface.
Abstract The inert surface of extruded polystyrene foams (XPSF) was activated by ultraviolet-ozone (UVO) for the first time to improve the interfacial compatibility with mortar. From the structural analysis (X-ray photoelectron spectroscopic (XPS) and contact angle (CA)), it was suggested that a 10 min UVO exposure was efficient enough to introduce oxygen-contained elements (such as carboxyl groups) upon the obtained UVO-XPSF surface, leading to the increased bonding strength (BS) from 0.058 MPa of neat XPSF/mortar composites to 0.088 MPa. Then, 3-aminopropyl triethoxysilane (APTES) was selected as the promoter to further enhance the BS value of XPSF/mortar composites. The presence of the silane was confirmed by CA, Fourier transform infrared-attenuated total reflection (FTIR-ATR) and XPS. By optimizing the reaction conditions (activation and reaction time: 7 and 3 min, concentration of APTES: 2% and pH value of the silane solution: 10), a maximum BS of 0.168 MPa could be obtained. Through the mechanism analysis, it was demonstrated that APTES acted as a chemical bridge that covalently jointed XPSF by the formation of amide peptide and inorganic mortar by the condensation of silanols.
Covalent bonding of the extruded polystyrene foams to mortar through ultraviolet-ozone irradiation
Jin, Xiaodong (Autor:in) / Cui, Suping (Autor:in) / Zhang, Yao (Autor:in) / Zhao, Xinxin (Autor:in) / Lv, Feng (Autor:in) / Sun, Shibing (Autor:in) / Tian, Yingliang (Autor:in) / Zhao, Zhiyong (Autor:in) / Liu, Donghua (Autor:in)
06.02.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Method for improving tensile bonding strength of extruded polystyrene board and mortar
| Europäisches Patentamt | 2023