Optimization of CNTs and SiO2 for thermostability and mechanical properties of PF microcapsules : used for self-healing of closed wall cracks in goaf

• Autorzy: Fu Mingming , Ma Boyu , Zhang Yuanping , Jia Xinlei , Chen Lu , Zhang Yuping , Sun Kaidi , Zhao Guanning , Wang Mengyao

Identyfikatory

DOI

10.37190/ppmp/170020

• Języki publikacji: EN

Abstrakty

EN

Air leakage of closed wall in coal mine goaf would cause spontaneous combustion of remained coal. Most of measures to repair cracks are carried out after cracks are penetrated, which is not conducive to early prevention of spontaneous combustion. Repairing damage at the initial stage of cracking makes prevention effect to the best. Phenol-formaldehyde resin (PF) microcapsules embedded in closed wall to achieve self-healing of initial cracks, but the actual repair effect is often less than expected. PF microcapsules (PFM) of carbon nanotubes (CNTs) and silicon dioxide (SiO₂) decorated shell for self-healing of closed wall cracks were prepared by in-situ polymerization. The effects of nanomaterials on morphology, chemical constitution, thermal performance and mechanical properties of PF microcapsules were characterized by scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and nanoindentation test. The test results indicated that nanomaterials were successfully introduced into the shell of PF microcapsules. The CNTs-SiO₂@PF microcapsules were uniformly dispersed, the thermal decomposition was delayed, and the residual carbon was significantly increased, and the brittleness of PF microcapsules was significantly enhanced. The 0.2CNTs-SiO₂@PF microcapsules (0.2CNTs-SiO₂@PFM) had a uniform and full particle size, the initial decomposition temperature was 267.6℃, the residual mass was 41.3%, the maximum load on the capsule wall reached 94.79 mN, and the load dropped sharply after the capsule wall rupture. Finally, the self-healing mechanism of closed wall doped with microcapsules was discussed. The exploration of modified phenolic microcapsules provides a new idea for the repair of closed wall in goaf.

Słowa kluczowe

EN

PF microcapsule; crack repair; closed wall; nanomaterials; heat resistance; brittleness

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2023
• Tom: Vol. 59, iss. 3
• Strony: art. no. 170020
• Opis fizyczny: Bibliogr. 27 poz., rys., wykr.

Twórcy

autor

Fu Mingming

• College of Civil Engineering and Architecture, Binzhou University, Shandong, Binzhou 256600, China

autor

Ma Boyu

• School of Coal Engineering, Shanxi Datong University, Shanxi, Datong 037003, China

autor

Zhang Yuanping

• School of Coal Engineering, Shanxi Datong University, Shanxi, Datong 037003, China

autor

Jia Xinlei

• College of Civil Engineering and Architecture, Binzhou University, Shandong, Binzhou 256600, China

autor

Chen Lu

• College of Civil Engineering and Architecture, Binzhou University, Shandong, Binzhou 256600, China

autor

Zhang Yuping

• College of Civil Engineering and Architecture, Binzhou University, Shandong, Binzhou 256600, China

autor

Sun Kaidi

• College of Civil Engineering and Architecture, Binzhou University, Shandong, Binzhou 256600, China

autor

Zhao Guanning

• College of Civil Engineering and Architecture, Binzhou University, Shandong, Binzhou 256600, China

autor

Wang Mengyao

• College of Civil Engineering and Architecture, Binzhou University, Shandong, Binzhou 256600, China

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).