Effect of Microbial Mineralization Modified Montmorillonite Reinforced Natural Rubber
MENG Ziyi1,2, LI Jing2, KUAI Rong2, LEI Qianjie2, FU Xudong1,2, ZHANG Rong1,2, HU Shengfei1,2, LIU Qingting1,2
1 Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China 2 School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China
Abstract: The hydrophilic montmorillonite in the lipophilic rubber matrix tends to aggregate and cannot achieve an ideal reinforcement effect. Using Traditional physical or chemical methods to modify the surface of montmorillonite can cause many problems such as environmental pollution, huge energy or time consuming. In this work, a novel microbial montmorillonite was prepared through both the microbial corrosion and mineralization. The microbial montmorillonite with exfoliated/intercalated lamellar structures was initially achieved by utilizing biomineralization of sulfate-reducing bacteria and then applied to the reinforcement of rubber compounds. Compared with the pristine montmorillonite, the microbial montmorillonite had characteristic peaks of amination corrosion of microorganism in FTIR spectra and the decrease of the zeta potential, showing the effect of microbial corrosion; the (001) diffraction peaks in X-ray spectra dropped to 6.15° while new diffraction peaks appeared at 1—3°, indicating that the microbial mineralization generated CaCO3 crystals which expanded the distance between montmorillonite layers. When the microbial mont-morillonite was added into the natural rubber, the tensile strength of the compound achieved 20.4 MPa, which was almost the same as the rei-nforcement effect of carbon black N774, attributing to the enlarged interlayer space allowing the easy penetration of rubber chains and the surface-attached biofilms acting as the compatibilizer. Similar results were also obtained from microbial corrosion reinforcing the polar neoprene rubber, showing the good application prospects of microbial mineralized montmorillonite as reinforcing fillers in rubber industry.
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2022, Vol. 36 
