The Preparation and Property of PMMA Nanocomposite and Nano-dispersed Montmorillonite Solution

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This thesis contains two parts. In the first part, we adopted the previous method to produce the chitosan/montmorillonite nanocomposites. With some modification, we obtained a nanoscale silicate chitosan solution (NSCS) and it can be used as emulsifier for PMMA emulsion polymerization to improve the properties of PMMA. In the second part, we employed KPS-modified montmorillonite as an initiator for PMMA emulsion polymerization. During polymerization, montmorillonites were exfoliated and intermingled with PMMA in polymer particles to form a will-dispersed nanocomposite. On the basis of the analysis of TGA, DSC, TMA, and MHT, the thermal and mechanical properties of such-formed nanocomposite have been significantly improved. On the other hand, nanoscale silicate solution (NSS) can be afforded after removal of PMMA by extraction with toluene. Both length and width of exfoliated montmorillonite are about 100 ~ 3000 nm and the thickness of exfoliated montmorillonite is about 6 ~ 8 nm which are confirmed by TEM and AFM analysis.