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In-situ encapsulating MMT intermediate particles by suspension polymerization of poly (methyl methacrylate-co-styrene): preparation, tunable dispersion and properties

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Abstract

Effectively encapsulating large size inorganic particles by polymeric materials is of great significance in making functional materials. In this paper, poly (methyl methacrylate-co-styrene)/montmorillonite (MMT) intermediate particles (PMMAS/I-MMT) were prepared by the suspension polymerization method. The chemical composition, dispersion behavior, particle size distribution and properties of PMMAS/I-MMT composite particles were characterized by energy dispersive spectrometer (EDS), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), transmission electron microscopy (TEM), thermo-gravimetric analysis (TGA) and a laser particle analyzer. By using a step-by-step intercalation process of MMT clay and a careful separation process, the interlayer spacing of pristine Na-MMT was well tuned from 1.2 nm to 1.9 nm to provide I-MMT phase. MMT layers encapsulated in PMMAS copolymer were characterized by FTIR. XRD indicated that I-MMT interlayer spacing was further enlarged to 3.3 nm in the PMMAS composite with 3.0 wt% I-MMT loading and these composite films showed tunable and gradual exfoliation behavior, which was consistent with TEM analysis. The obtained volume average size of PMMAS/I-MMT composite particles had a narrow size distribution from 52.0 μm to 79.0 μm. The active layer exfoliations had greatly enhanced PMMAS thermal stability up to 453 °C by TGA, and the properties of its surface wetting and barrier against water were stably improved. Such encapsulated MMT composite particles may provide candidate materials for modifying fluid channels of petroleum engineering.

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Acknowledgments

Financial supports of forward-looking guidance project of China University of Petroleum (Beijing) (QZDX-2010-04), National major project (2011ZX05009-005), Natural science foundation of China (No.21076229), PRP/open-1105, and the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant, No.51221003) and Science Foundation of China University of Petroleum, Beijing (No.KYJJ2012-06-30) were greatly appreciated.

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  1. Nanotechnology Center of Energy Resources, State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum, Beijing, 102249, China

    Jingshui Xu, Yangchuan Ke, Qian Zhou & Xianglong Hu

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  1. Jingshui Xu
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  2. Yangchuan Ke
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Correspondence to Yangchuan Ke or Qian Zhou.

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Xu, J., Ke, Y., Zhou, Q. et al. In-situ encapsulating MMT intermediate particles by suspension polymerization of poly (methyl methacrylate-co-styrene): preparation, tunable dispersion and properties. J Polym Res 20, 196 (2013). https://doi.org/10.1007/s10965-013-0196-3

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