Polymer / Montmorillonite Nanocomposites And Montmorillonite Price Of Electronic Theory

Polymer/montmorillonite nanocomposites is a variety of composites being widely studied in the past decade. Excellent thermal and mechanical properties, special barrier properties to gas and liquid and flame-retardent characteristic give it the high promise for industrial application. As a first part, a review is given to describe the latest research and development in technology of Polymer/montmorillonite nanocomposites.Designed the MMT structure unit according to it's crystal structure, the valence electron structure of MMT was calculated and analyzed by means of "EET" (empirical electron theory of solids and molecules) theory. The solution shows that covelance electron of Si-0 and Al-O connected with oxygen bridge are 2.2374 and 0.6704, and bonding energy of them are 352.8741KJ/mol and 99.8769KJ/mol respectively, proves that Al³⁺ in MMT is easier to cause multipile isomorphous replacement than Si⁴⁺ and the binding force of three sub-layer in MMT layer is much stronger than the Van Der Waals force between layers of MMT.Polyaniline/montmorillonite (PAn/MMT) nanocomposites were synthesized by a simple solution intercalation polymerization technology, polystyrene/montmorillonite (PS/MMT) nanocomposites were synthesized by emulsion intercalation polymerization, polyvinyl chloride/montmorillonite (PVC/MMT) nanocomposites and PVC/PS/MMT nanocomposites were synthesized by polymer melted intercalation. Fourier Transition Infrared (FTIR) and X-ray Diffraction (XRD) characterization for composites' structure showed that, the chains of PAn, PS and PVC have been intercalated into the galleries of MMT, the position of the diffraction peak of MMT's 001 plane excursed to left (which means that the distance between layers has broadened), and the peaks intensity of MMT in PS/MMT, PVC/MMT and PVC/PS/MMT nanocomposites have weakened greatly. The diffraction peaks of MMT's 001 plane have become a dispersed peak, which indicates an exfoliated state.Thermal properties of nanocomposites containing different contents of MMT have been studied. The result of TG and DTA showed that, compared with pure PAn, onset temperature of PAn/3wt%⁵wt%CTAB-MMT nanocomposites is improved by 48.5%. DTA showed that, compared with pure PS, onset temperature of PS/4wt%CTAB-MMT nanocomposites is improved by 10℃.Tribology properties of PS/MMT nanocomposites with different content MMT have been studied through UMT-2MT. The solution showed that, friction and wear properties of nanocomposites containing 2wt% MMT is better than pure PS, under 200g load, wear coefficient of composites declined by 28%, this phenomena becomes more obviously with the decrease of load.Hardness of PS/MMT nanocomposites was tested with HBRVU-187.5. The solution showed that, comparing with pure PS, Hardness of PS/6wt%MMT is improved by 12.8%.