STRUCTURAL INHOMOGENEITY OF POLYMER MATRI X IN GLASS-REINFORCED PLASTIC MATERIALS BASED ON BINARY PREPREGS

Molecular segmental mobility in polymer matrices of fiber-glass materi als, based on traditional mixed prepregs and new binary prepregs with separate application of the components was studied by dilatom etry and dynamic mechanical method (bending resonance vibrations) in the cours e of curing. Examination of the relaxation spectra of polymer matrix s hows that no complete concersion of functional groups of the initial b inding agent is achieved in the case of prepregs. This fact is explain ed by the possible development of a three-dimensional mosaic structure with a regular alternation of microvolumes with a high cross-linking density (high inner rigidity) and microvolumes with a low cross-linkin g density (high molecular mobility). This mosaic structure is shown to provide an optimal combination of elastic and relaxation properties i n the fiber glass plastic materials.