Abstract
Poly(butylene terephthalate) (PBT) is one of the most widely used semicrystalline thermoplastics polyester because of its superior thermal and mechanical properties, high dimensional stability and excellent processability. In this research PBT-based nanocomposites, including various amounts (up to 10 wt%) of commercial alumina whiskers, have been prepared by using a Brabender internal chamber mixer and analysed in terms of morphological features and dielectric properties. Specific attention has been focused on the effect of the filler functionalization considering 3-glycidoxy propylmethoxysilane (GPS) or 3-methacryloxypropyltrimethoxysilane (MPS) as coupling agents. Tests, performed on compounds filled with neat and functionalized alumina whiskers, show a clear dependence of relative dielectric permittivityεr, invariance of dissipation factor (tgδ), and a sensible increase of volume electrical resistivity(ρv)with the filler’s content and are encouraging for a future introduction of such composites in many electrical applications.
Highlights
Poly(butylene terephthalate) (PBT) resins are semicrystalline thermoplastics with very interesting properties such as excellent dimensional stability, high stiffness and hardness, good resistance to chemicals, good mechanical properties, and processability
With the awareness that optimal combinations of organic and inorganic phases can lead to novel functional materials, if an optimal distribution of the filler is achieved, interesting results are already reported in terms of improvements of several performances as UV resistance [12, 13] and flammability [14,15,16,17] of poly(butylene) terephthalate resins
After having verified the achievement of a satisfactory dispersion of the filler in the host PBT matrix by morphological observations, effects related to filler content and type of applied particle functionalization on dielectric parameters of products such as volume resistivity, permittivity, and dissipation factor evaluated at room temperature have been reported and discussed invoking the previous mentioned approaches
Summary
Poly(butylene terephthalate) (PBT) resins are semicrystalline thermoplastics with very interesting properties such as excellent dimensional stability, high stiffness and hardness, good resistance to chemicals, good mechanical properties, and processability. The ever increasing use of plastics in place of traditional materials has fed an increasing demand to develop higher performance PBT resins suitable for various processing conditions and, to be utilized in various advanced fields by blending with other resins [1,2,3,4,5] or compounding with inorganic fillers [6,7,8,9,10,11] In this latter case, with the awareness that optimal combinations of organic (polymer) and inorganic (nanofiller) phases can lead to novel functional materials, if an optimal distribution of the filler is achieved, interesting results are already reported in terms of improvements of several performances as UV resistance [12, 13] and flammability [14,15,16,17] of poly(butylene) terephthalate resins. After having verified the achievement of a satisfactory dispersion of the filler in the host PBT matrix by morphological observations, effects related to filler content and type of applied particle functionalization on dielectric parameters of products such as volume resistivity, permittivity, and dissipation factor evaluated at room temperature have been reported and discussed invoking the previous mentioned approaches
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