Browsing by Author "Krastev P."

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    In-situ preparation of polyamide-6/polypropylene glycol copolymers with mineral fillers
    (2014-01-01) Krastev P.; Mateva R.
    Polyamide-6 /Polypropylene glycol (PPG) copolymers were synthesized via anionic polymerization of e-caprolactam in the presence of inorganic additives - graphite and boron carbide using isophorone diisocyanate end functionalized PPG prepared in-situ as a macroactivator. Sodium caprolactam was used as an initiator. The influence of the graphite and boron carbide fillers on the degree of conversion was investigated. The copolymers obtained were characterized by 1 H NMR and FTIR spectroscopies. The charpy impact strength of the composites was evaluated.
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    Neutron absorption of composites based on polyamide-6
    (2015-01-01) Krastev P.
    Composites based on Polyamide-6 with graphite and boron carbide were synthesized in an one step process, via activated anionic polymerization of e-caprolactam. Possible application of the composites as radiation protective materials was investigated by evaluating the absorption of thermal and fast neutrons. Based on the relationship between mechanical properties and fillers content, determined by dynamic mechanical thermal analysis, optimum ratios between the components were proposed. Composites structures were observed by scanning electronic microscopy.