Film casting of polycarbonate/multi-walled carbon nanotubes composites using ultrasound-assisted twin-screw extruder: experiment and simulation

IF 1.1 4区 工程技术 Q4 ENGINEERING, CHEMICAL International Polymer Processing Pub Date : 2022-07-14 DOI:10.1515/ipp-2021-4200
Xiang Gao, A. Isayev
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Abstract

Abstract A one-step ultrasonic film casting process to manufacture nanocomposite films was developed, in which polycarbonate (PC) was mixed with multi-walled carbon nanotubes (CNT) and cast into films in one process. Numerical and experimental investigations of necking phenomenon were carried out for film casting of PC/CNT composites. Experimental results revealed that the necking along film line decreased with imposition of ultrasound and increasing CNT content, indicating that incorporation of CNT and imposition of ultrasound restrained the elongational flow behavior of melt, resulting in film of a larger width. Isothermal and nonisothermal numerical simulations of the process were performed. In isothermal simulations, the polymer melt was assumed to be maintained at the die temperature. In nonisothermal simulations, the temperature change along the film line was determined from heat transfer calculations with the WLF temperature-dependent viscosity. The simulated and experimental results on normalized film width, defined as a ratio of cast film width to die width, as a function of the distance from the die at various extension ratios were compared. The comparison indicated that changes in film width and thickness along the stretching direction in the nonisothermal process were in better agreement with experimental results than that in the isothermal process. Both experimental and simulated results showed a decrease of film width with take-up speed. Due to the presence of edge effect, the film width in experiment was lower than the simulated one. With incorporation of CNT, a better agreement between experimental and simulated results was obtained, due to a reduced edge effect in the film.
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超声辅助双螺杆挤出聚碳酸酯/多壁碳纳米管复合材料薄膜铸造:实验与仿真
摘要:提出了一种以聚碳酸酯(PC)与多壁碳纳米管(CNT)混合制备纳米复合膜的超声一步浇铸工艺。对PC/CNT复合材料薄膜铸造过程中的缩颈现象进行了数值和实验研究。实验结果表明,随着超声的施加和碳纳米管含量的增加,沿膜线的颈缩减小,表明碳纳米管的加入和超声的施加抑制了熔体的拉长流动行为,导致膜的宽度增大。对该过程进行了等温和非等温数值模拟。在等温模拟中,假设聚合物熔体保持在模具温度下。在非等温模拟中,沿膜线的温度变化由传热计算和WLF温度依赖粘度确定。比较了在不同拉伸比下,归一化膜宽(即铸膜宽度与模具宽度之比)与模具距离的函数关系的模拟结果和实验结果。对比结果表明,非等温过程中薄膜宽度和厚度沿拉伸方向的变化比等温过程中更符合实验结果。实验和模拟结果均表明,膜宽随卷取速度的增加而减小。由于边缘效应的存在,实验得到的膜宽小于模拟得到的膜宽。随着碳纳米管的加入,由于薄膜中的边缘效应减少,实验和模拟结果之间的一致性更好。
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来源期刊
International Polymer Processing
International Polymer Processing 工程技术-高分子科学
CiteScore
2.20
自引率
7.70%
发文量
62
审稿时长
6 months
期刊介绍: International Polymer Processing offers original research contributions, invited review papers and recent technological developments in processing thermoplastics, thermosets, elastomers and fibers as well as polymer reaction engineering. For more than 25 years International Polymer Processing, the journal of the Polymer Processing Society, provides strictly peer-reviewed, high-quality articles and rapid communications from the leading experts around the world.
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