Exfoliated epoxy / nano-phase structure of composite materials

    In economic production activities, both in the general area of technology, or in the cutting-edge technology, epoxy resin (Epoxy, EP) to paint, casting materials, molding materials, adhesives, laminating materials, injection molding materials, and composite materials form, be applied directly or indirectly. For example: aircraft, spacecraft in reinforced composite materials, large scale integrated circuit packaging materials, insulation of large generators, steel and wood preservative coating materials, machining civil construction adhesives, and even building and furnishing materials, inner coating of food cans and metal corrosion resistant coating so extensive use of epoxy resin electrophoresis.

    With the construction of industrial and economic development of thermosetting epoxy resin as an important more and more attention, but with the application environment and conditions of its people are constantly making new demands, the ordinary epoxy resin material is There performance has seriously hampered its application in a wider area, such as toughness and heat resistance is poor and so on. At present the development and application of epoxy resin focused on improving its heat resistance, electrical properties and impact resistance, but the effect is not too significant, and there are great differences [1-4], need further research and development . The research topic is the use of MMT was modified epoxy resin, with a view to improve the performance of the integrated use of epoxy resin.

    In the field of polymer nanocomposites, either basic research or industrial applications, polymer/layered silicate (Polymer/Lay-eredSilicate, PLS) nanocomposites have shown very active. One of the most value of the layered silicate is montmorillonite (Montmorillonite, MMT), belongs to a class of natural bentonite clay. PLS nanocomposites preparation of economic and practical, the performance of impressive physical and mechanical properties and good processing properties and known.

    At present, for the preparation of PLS nanocomposites are mainly montmorillonite layered silicate clay. Without a surface treatment of MMT organically with a strong hydrophilic (Hydrophilic), poor compatibility with the polymer, so the preparation of polymer/clay nanocomposites must be conducted on a clay surface treatment machines. The basic principle of organic treatment is: organic quaternary ammonium montmorillonite interlayer exchangeable cations and cation ion exchange reaction, the organic groups covered in the clay mineral surface, change its surface properties, changes from the hydrophilic to lipophilicity. Organic treated montmorillonite with many organic solvents and polymers have a good affinity. Studies have shown that [5-7], layered silicate treatment is the preparation of organic polymer/clay nanocomposites essential key steps.

Test Part 1

    Interphase interface structure of composites is to determine the macroscopic properties of composite materials a key factor. Research on the subject of the PLS-based EP/MMT nanocomposites in terms of, EP resin matrix has a certain amount of dispersion of the layered inorganic nanoparticles. Yin Nami unique characteristics of particles, such as small size effect, surface effect, quantum size effect, and macroscopic quantum tunnel effect, resulting in organic/inorganic nano-size range in the two phases within the composite, interfacial area between the two phases is very large, the interface has a strong interaction between; at this time is different from the common interface between two phases of organic/inorganic composite, clear and sharp phase interface becomes blurred. The interface structure changes, the macroscopic properties of composite materials, especially the mechanical properties and dielectric properties of significant impact.

    EP/MMT nanocomposite organic/inorganic phase interface between two phases were formed by spin-off of its own premise of MMT. MMT nano-structure itself, and its unit cell has a thickness of about 1nm of the sheet, sheet length and width of about 100nm. Such separated from lamellar nanostructures after the formation of the one-dimensional in space layers, by means of mechanical action of the scattered dispersion of these nano-layers to the polymer matrix after the composite and the matrix resin to form good contact to form a true sense of the nano-composite, so that the interface of composite materials with nano and have real claim to nano-materials. Therefore, the phase structure of composite materials characterization, will mainly focus on nano-MMT in the stripping and the generation and expansion interface.

Added2011-01-05 12:19:23       Clicks2895      Source