Magnesium sulfate whiskers

Magnesium sulfate whiskers have expansion coefficients similar to those of plastics, and good compatibility with plastics, and their composite materials have good physical and mechanical properties. Furthermore, they have properties such as nontoxicity, low smoke generation, and fire resistance. 

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Figure 3.10 SEM images of magnesium sulfate whiskers, (a) xIOOO. (b) X5000.

Magnesium sulfate whiskers have both reinforcing and flame retardant effects when hlled into plastic or resin matrix to make composite materials. Composites manufactured with magnesium sulfate whiskers can be used in some parts of trains, trucks, and other motorcars because of their excellent chemical and physical performances. Figure 3.10 shows the microstructure of magnesium sulfate whiskers. ... 

Han et al. modified basic magnesium sulfate whiskers using sodium stearate. The method is as follows. First, measure 50 g of basic magnesium sulfate whiskers and prepare a 5% (mass fraction) mixture of whiskers and water. Second, blend the mixture evenly and then keep it at constant temperature at 80°C in a water bath. Third, add sodium stearate to the mixture and stir for 30 minutes. Products are obtained after filtration and low-temperature drying. Finally, strong chemical adsorption between whiskers and sodium stearate develops after modification. 

Yuexin Han, Lixia Li, Wanzhong Yin et al. On the surface modification of basic magnesium sulfate whiskers. Journal of Northeastern University (Natural Science), 30(1) 133-136, 2009. 

Figure 4.9 shows the changing curve of the MFI of PP filled with different amounts of whiskers. M-PP represents PP modified with basic magnesium sulfate whiskers K-PP represents PP treated with potassium titanate whiskers. 

Modulus is the characterization of a rigid material. The elasticity modulus of plastic products made from pure resin is low, even for polyesters and polyamides with relatively higher elastic moduli, which is only 2.5%-10% of the metal elasticity modulus. The modulus of elasticity of filled plastics always increases with the addition of filler because the filler modulus is much larger than the modulus of polymers. For example, when 40 phr of magnesium sulfate whiskers are added to PVC, the breaking strength of the composite material increases by 62.43% and the modulus of elasticity increases by 52.38%.2o... 

PP is the most studied material in whisker reinforcing and toughening modification research. Zhou et al. studied PP modified with potassium titanate whiskers and found that the notched impact strength increased by 20% over that of pure PP. Lu et al. studied PE composite material modified with magnesium sulfate whiskers, and found that when... 

Wen Lei, Tao Yang, Chao Ren. Mechanical properties and thermal performance of UP resin/ramie cloth/basic magnesium sulfated whisker composites. China Plastics, 20(121 23-27, 2006. 

Jianjun Yin, Jingjing Li, Yunhua Song et al. Effect of basic magnesium sulfate whisker on properties of flexible polyvinyl chloride./owma/University of Technology, 35(3) 21-24, 2009. 

Yuexin Han, Xu Chen, Wanzhong Yin. The research of basic magnesium sulfate whisker filed up polypropylene. Non-Ferrous Mining and Metallurgy, 23(5) 42-45, 2007. 

Huawei Jia, Zaijiang Ding. Study of nylon 6 filled with magnesium sulfate whisker. China Plastics Lndustry, 35(S1) 141-143, 2007. 

Basic magnesium sulfate whisker Calcium titanate whisker Aluminum borate whisker Sepiolite (magnesium silicate)... 

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