The Effects of Addition of Surface-treated Silica Particle in Polycarbonate Composites.
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The thermal stability of polycarbonate resin (PC) composites filled with silica particles surface-treated with polyphenol reagents has been investigated. The composites were prepared by mixing the surface-treated silica particle with PC using a plastometer at 280°C. For the composites containing 15vol% non-treated silica particles, the number-average molecular weight (Mn) of PC in the composites, measured by gel permeation chromatography, decreased from 24300 to 18100 at a mixing time of 60min, while unfilled PC resin control decreased to 21700. The magnitude of the storage modulus (E′) and the glass transition temperature (Tg) of the composites were evaluated by dynamic viscoelastometry. Both decreased with decreasing molecular weight of PC. These results suggest that the PC molecule depolymerized during the mixing process due to the thermal energy and stress. On the other hand, we found that the surface treatment of silica particles with tannic acid reduced the decrease in PC Mn to 22400 and also reduced the decrease in E′ and Tg. In addition, we studied the effects of surface treatment of silica particles using polyphenol groups with different numbers of hydroxy groups. Reagents with many hydroxy groups resulted in higher Mn retention than those containing reagents with fewer hydroxy groups. These findings suggest that the addition of surface-treated particles in PC improved the stability of PC composites. This implies that surface treatment may be an effective method in recycle of PC resin composites.
- 一般社団法人 プラスチック成形加工学会の論文
一般社団法人 プラスチック成形加工学会 | 論文
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