Effect of dispersion method of modified nano or micro SiO2 on mechanical properties of wood flour-SiO2/polypropylene composites

被引：0
|
作者：
Mu H. [1 ]
Hao X. [2 ]
Xiao Z. [1 ]
Wang H. [1 ]
Zhou H. [1 ]
机构：
[1] Key Laboratory of Bio-based Material Science & Technology (Ministry of Education), Northeast Forestry University, Harbin
[2] College of Materials and Energy, South China Agricultural University, Guangzhou
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2019年 / 36卷 / 11期
关键词：
Creep; Dispersion; Interfacial modification; Polypropylene; Reinforcement effect; SiO[!sub]2[!/sub; Wood flour;
D O I：
10.13801/j.cnki.fhclxb.20190227.001
中图分类号：
学科分类号：
摘要：
The unmodified and vinyl trimethoxysilane (VTS) modified nano SiO2 and micro SiO2 were used as the reinforcement phases to incorporate into polypropylene (PP) by direct dispersion (dry dispersion) or by dispersion in solution (wet dispersion), respectively. The wood flour (WF) was used as modifier to prepare WF-SiO2/PP composites. The effects of the SiO2 particle size, dispersibility and interfacial modification on the reinforcement of the WF-SiO2/PP composites were determined. Infra-red spectra show that SiO2 is grafted onto the PP matrix. Compared with the unfilled WF/PP composites, the resulting WF-SiO2/PP composites incorporated with 9% micro SiO2 or 9% nano SiO2 (mass ratio) via dry dispersion mode exhibit 21% and 18% reduction in the flexural strength, respectively. However, wet dispersion and VTS modification result in 17% and 22% increase in flexural modulus for incorporating the micro SiO2 and nano SiO2, respectively. The creep resistance is also improved obviously via wet dispersion process and VTS modification. The impact strength of the WF-SiO2/PP composites increases by 17% by filling the micro SiO2 via dry or wet dispersed modes. This study demonstrates that adding proper amount of nano or micro SiO2 can increase the impact strenth of WF-SiO2/PP composites by 15%-25% on the premise of a uniform dispersion and establishment of a well-bonded interface between the SiO2 and the matrix. © 2019, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.
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页码：2603 / 2613
页数：10
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