Mechanical and Thermal Properties of Reactable Nano-SiO₂/polyoxymethylene Composites

Abstract:

The polyoxymethylene-based composites containing reactable nano-SiO₂ were prepared in a twin-screw extruder by melt compounding, and mechanical and thermal properties of pure polyoxymethylene (POM) and composites were investigated. The results showed that reactable nano-SiO₂ could reinforce the tensile strength and Young’s modulus of composites. To the impact strength of composites, there was obvious improvement when a small amount of silica was added into POM. With the increase of silica content, the impact strength of composites showed a gradually decrease trend. It was worthy to note that reactable nano-SiO₂ could significantly increase the decomposition temperature of POM. When the content of reacta_{Subscript text}ble nano-SiO₂ was up to 5 wt%, the degradation temperature of composites could increase about 38.3°C under n_{Subscript text}itrogen atmosphere and 43.8°C under air atmosphere, respectively, compared with pure POM. Furthermore, the differential scanning calorimetry (DSC) analysis showed that reactable nano-SiO₂ had a good heterogeneous nucleation capability in POM, and could increase crystallization temperature of POM, but surface structure of reactable nano-SiO₂ was not propitious to the growth of POM crystals, accordingly leading to the decreasing crystallinity of composites.

• Periodical: Advanced Materials Research (Volumes 535-537)
• Pages: 103-109
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.535-537.103
• Online since: June 2012
• Authors: Xiang Min Xu, Li Ping Guo, Yu Dong Zhang, Zhi Jun Zhang
• Keywords: Mechanical Property, Polyoxymethylene, Reactable Nano-SiO₂, Thermal Property

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