Determination of composites nano structure parameters by very cold neutrons scattering

Full text: A method for materials research based oneself on the unique properties of the very cold neutrons (VCN) have been developed in Lebedev Physical Institute. In this work VCN scattering was used to study the super molecular structure (SMS) of polyolefine based composites. The multiwalled carbon nano tubes (MWCNT), calcium carbonate and montmorillonite submicron particles were used as the fillers. The first type filler was used to obtain the multi functional material with high modulus of elasticity and high electro- and thermo-conductivity. These properties depend on the parameters of the MWCNT and its distribution in composite. The second type filler was used to increase the stroking solidity of polypropylene without the loss of material cruelty. The coefficient of elasticity and the yield point dependencies on the filler concentration were obtained for . The montmorillonite/polyethylene sample was studied to compare its SMS with the same of the sample obtained by polymerization intercalation technology. The fractal type structure model was used to describe the VCN scattering on the fillers agglomerates. The volume part of isolated filler particles in composite was obtained by VCN scattering, as well as its average dimensions. The thickness of MWCNT wall was also determined by X-ray diffraction method. (author)