The effect of filler surface modification and processing conditions on distribution behaviour of silica nanofillers in polyesters |
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Authors: | Karol Bula Teofil Jesionowski Andrzej Krysztafkiewicz Jolanta Janik |
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Institution: | (1) Institute of Materials Technology, Poznan University of Technology, Piotrowo 3 Street, 60-965 Poznan, Poland;(2) Institute of Chemical Technology and Engineering, Poznan University of Technology, M. Sklodowskiej-Curie 2 Sq., 60-965 Poznan, Poland;(3) Institute of Polymer Science, Technical University of Szczecin, 10 Pulaskiego Street, 70-332 Szczecin, Poland |
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Abstract: | Dispersion and distribution of nanosized precipitated amorphous silica particles in poly(ethylene terephthalate) PET and poly(butylene
terephthalate) PBT matrices have been studied. The effect of silane coupling agent as well as processing conditions has been
analysed on the basis of microscopic analysis of sample morphology. N-2-(aminoethyl)-3-aminopropyltrimethoxysilane (A-1120) has been used as a silica surface modifier. The effect of the extrusion
process performance with a single and a twin screw extruder has been tested. It has been found that the processing conditions
are more important factors determining fine dispersion and homogenous distributions of filler particles in the matrix than
the filler surface modification. The results obtained have revealed that single screw extrusion is preferred only for processing
the composites comprising the silica modified with aminosilane, while the application of twin screw extrusion leads to homogenous
dispersion and fully deagglomeration of filler particles without silane treatment. It has been established that when the concentration
of silica filler increased from 3 up to 7% by weight, the secondary process of particle aggregation occurs. |
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Keywords: | Amorphous spherical silica Silanes Dispersion of fillers Composite materials |
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