The microstructure and mechanical properties of new HDPE-chalk composites
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Technological Centre, A. Mickiewicz University
Technical and Agricultural Academy of Bydgoszcz
Department of Macromolecular Physics, A. Mickiewicz University
Maciej Kozak   

Department of Macromolecular Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
Publication date: 2003-01-01
Physicochem. Probl. Miner. Process. 2003;37(1):141–147
Increasing demands on the quality and specific properties of polymers imply increasing demands on the mineral fillers used in composite materials. They are expected not only to reduce the cost of production but also improve the mechanical properties of the composites or endow them with new features, e.g. thermostability. The paper presents a method for obtaining polyethylene composites with chalk modified by two new 1-alcoxymethyl-3-hydroxypyridinium chlorides: 3-hydroxy-1- octyloxymethylpyridinium chloride (salt 1) and 3-hydroxy-1-octadecyloxymethylpyridinium chloride (salt 2) and gives a characterisation of the composites obtained. Introduction of chalk modified with ammonium salts results in an increased values of MFI of the composites. The MFI changes are the most pronounced for the PE composites containing the filler in concentrations from 0.05 to 2.0% wt. Addition of the chalk modified with the ammonia salts causes greater changes in some mechanical properties of the composites (Young modulus) than addition of unmodified chalk, while changes in some other properties (stress at break) was practically the same.