polyperoxide

In this paper the method of modification of polypropylene planar surfaces and microfibers through covalent grafting of a polyacrylic acid nanolayer by a free radical mechanismis presented.After grafting of the nanolayers, the hydrophobic surface of the polypropylene acquires hydrophilic properties. These changes are confirmed by the alteration of the free surface energy on the planar surfaces and by the increase of retentioned water by the microfibers before and after modification.

Flame-retardant polymer composites based on homo- or copolymers of propylene as the matrix polymer and dispersed magnesium hydroxide, surface-modified by polyperoxides, as the filler have been obtained and characterized. The influence of the polyperoxide nature and the content of peroxide groups immobilized at the filler surface onto the mechanical and rheological properties as well as flame retardancy of composites have been studied.