Effect of Screw Rotation Speed on the Properties of Polycarbonate/Vapor-Grown Carbon Fiber Composites Prepared by Melt Compounding
Effect of Screw Rotation Speed on the Properties of Polycarbonate/Vapor-Grown Carbon Fiber Composites Prepared by Melt Compounding
复制标题
螺杆转速对熔融共混聚碳酸酯/气相生长碳纤维复合材料性能的影响
DOI：
10.3139/217.2799
复制
发表时间：
2014
影响因子：
1.3
通讯作者：
Y. Iemoto
中科院分区：
文献类型：
--
作者：
S. Tanoue;J. Nithikaranjanatharn;H. Okuzono;H. Ueda;H. Uematsu;Y. Iemoto
研究了螺杆转速对双螺杆挤出法制备聚碳酸酯(PC)/气相碳纤维（VGCF）复合材料力学性能和导热性能的影响。采用两种VGCF （VGCF- h，长宽比为40，VGCF- s，长宽比为100）。在拉伸试验中，添加VGCF-H后，无论螺杆转速如何，PC复合材料的破坏模式都转变为脆性破坏。随着螺杆转速的增加，PC/VGCF-H的杨氏模量略有增加。另一方面，PC/VGCF的断裂应变在150 min−1以上急剧下降。PC/VGCF-S的杨氏模量在150 min−1前随螺杆转速略有增加，但在175 min−1时有所下降。PC/VGCF-H的导热系数与螺杆转速无关。PC/VGCF-S的导热系数随着螺杆转速的增加逐渐增大，直到150 min−1,175 min−1时导热系数也逐渐减小。从SEM观察和流变学行为来看，VGCF-H在PC/VGCF-H中的分散状态与螺杆转速无关。另一方面，在PC/VGCF-S中观察到VGCF-S的网络结构，这些网络结构的状态取决于螺杆旋转速度。阐明了PC/VGCF的力学性能和导热性能与VGCF的分散状态有关。
Abstract The effect of screw rotation speed on the mechanical property and thermal conductivity of polycarbonate (PC)/vapor-grown carbon fiber (VGCF) composites prepared by a twin screw extruder was discussed in this paper. Two types of VGCF (VGCF-H, the aspect ratio of 40, and VGCF-S, the aspect ratio of 100) were used. In the tensile test, the breaking pattern of PC composite changed to brittle failures by adding VGCF-H irrespective of screw rotation speed. Young's modulus of PC/VGCF-H slightly increased with the screw rotation speed. On the other hands, the breaking strain of PC/VGCF drastically decreased above 150 min−1. Young's modulus of PC/VGCF-S slightly increased with screw rotation speed until 150 min−1, however, it decreased at 175 min−1. The thermal conductivity of PC/VGCF-H was independent of the screw rotation speed. In contrast, the thermal conductivity of PC/VGCF-S gradually increased with screw rotation speed until 150 min−1 and it also decreased at 175 min−1. From the SEM observation and rheological behavior, the dispersion state of VGCF-H in PC/VGCF-H was independent of the screw rotation speed. On the other hands, the network structures of VGCF-S were observed in PC/VGCF-S and the state of these network structures depended on the screw rotation speed. It was clarified that the mechanical property and thermal conductivity of PC/VGCF were attributable to the dispersion state of VGCF.