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.

Keywords

Suspension polymerization Encapsulated montmorillonite composite particles Styrene monomer Methyl methacrylate monomer Layered silicate intermediate particles 
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Notes

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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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Nanotechnology Center of Energy Resources, State Key Laboratory of Heavy Oil Processing, College of ScienceChina University of PetroleumBeijingChina

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