具有隔离结构的聚丙烯/碳纳米管复合材料的制备及电磁屏蔽性能

doi:10.11944/j.issn.1000-0518.2020.08.200083

摘要/Abstract

摘要： 通过共挤出包覆-热压法制备了具有隔离结构的聚丙烯(PP)/碳纳米管(CNTs)电磁屏蔽复合材料。其中,CNTs随机分布于PP基体中形成导电相,该导电复合物作为包覆层包敷在纯PP颗粒表面,形成包覆复合粒子,经热压后形成隔离导电网络。结果表明,所制备的隔离结构复合材料呈现良好的导电性能,可获得较低的导电逾渗值0.28%(体积分数);在CNTs质量分数为5.6%时,该复合材料电磁屏蔽性能达到25.6 dB,同时具有良好的力学性能。本文结果表明,共挤出包覆-热压法制备隔离结构导电复合材料方法简单可控、绿色环保,对开发高性能电磁屏蔽复合材料具有重要指导意义。

关键词: 隔离结构, 碳纳米管, 聚丙烯, 逾渗值, 电磁屏蔽

Abstract: Constructing segregated structure in polypropylene (PP)/carbon nanotubes (CNTs) composites via co-extrusion coating-compression molding technique is an effective way to achieve high electromagnetic interference shielding with low percolation threshold. Among them, CNTs are randomly distributed inside PP matrix to form conductive composites, which is coated on the outer surface of pure PP to form a segregated structure. The results show that the PP/CNTs composites exhibit an excellent electromagnetic interference shielding effectiveness (EMI SE) of 25.6 dB at 5.6% (mass fraction) of CNTs, and high-performance electrical conductivity with a low percolation threshold of 0.28% (volume fraction) CNTs. Furthermore the PP/CNTs composites have excellent mechanical properties. In a word, the co-extrusion coating-compression molding technique is a facile and green method, which plays a role in developing high-performance electromagnetic shielding composites.

Key words: segregated structure, carbon nanotubes, polypropylenes, percolation threshold, electromagnetic interference

邱健, 姜治伟, 邢海平, 李明罡, 刘杰, 唐涛. 具有隔离结构的聚丙烯/碳纳米管复合材料的制备及电磁屏蔽性能[J]. 应用化学, 2020, 37(8): 904-911.

QIU Jian, JIANG Zhiwei, XING Haiping, LI Minggang, LIU Jie, TANG Tao. Preparation and Electromagnetic Shielding Properties of Polypropylene/Carbon Nanotubes Composites with Segregated Structure[J]. Chinese Journal of Applied Chemistry, 2020, 37(8): 904-911.

参考文献

[1] Thomassin J M,Pardoen T,Bailly C,et al. Polymer/Carbon Based Composites as Electromagnetic Interference(EMI) Shielding Materials[J]. Mat Sci Eng R,2013,74(7):211-232.
[2] Yan D X,Pang H,Li B,et al. Structured Reduced Graphene Oxide/Polymer Composites for Ultra-efficient Electromagnetic Interference Shielding[J]. Adv Funct Mater,2015,25(4):559-566.
[3] Pang H,Xu L,Li Z M,et al. Conductive Polymer Composites with Segregated Structures[J]. Prog Polym Sci,2014,39(11):1908-1933.
[4] Feng D,Xu D W,Wang Q Q,et al. Highly Stretchable Electromagnetic Interference (EMI) Shielding Segregated Polyurethane/Carbon Nanotube Composites Fabricated by Microwave Selective Sintering[J]. J Mater Chem C,2019,7(26):7938-7946.
[5] Wang G L,Mark L H,Park C B,et al. Ultralow-Threshold and Lightweight Biodegradable Porous PLA/MWCNT with Segregated Conductive Networks for High-Performance Thermal Insulation and Electromagnetic Interference Shielding Applications[J]. ACS Appl Mater Interfaces,2018,10(1):1195-1203.
[6] Yu W C,Xu J Z,Li Z M,et al. Constructing Highly Oriented Segregated Structure Towards High-Strength Carbon Nanotube/Ultrahigh-Molecular-Weight Polyethylene Composites for Electromagnetic Interference Shielding[J]. Compos Part A-Appl Sci Manuf,2018,110:237-245.
[7] Mamunya Y,Matzui L,Vovchenko L,et al. Influence of Conductive Nano- and Microfiller Distribution on Electrical Conductivity and EMI Shielding Properties of Polymer/Carbon Composites[J]. Compos Sci Technol,2019,170:51-59.
[8] Xu D W,Wang Q Q,Liu P J,et al. Facile Fabrication of Multifunctional Poly(ethylene-co-octene)/Carbon Nanotube Foams Based on Tunable Conductive Network[J]. Ind Eng Chem Res,2020,59(5):1934-1943.
[9] Chen J,Liao X,Li G X,et al. Facile and Green Method to Structure Ultralow-Threshold and Lightweight Polystyrene/MWCNT Composites with Segregated Conductive Networks for Efficient Electromagnetic Interference Shielding[J]. ACS Sustainable Chem Eng,2019,7(11): 9904-9915.
[10] Zhang K,Yu HO,Gao Y,et al. A Facile Approach to Constructing Efficiently Segregated Conductive Networks in Poly(Lactic Acid)/Silver Nanocomposites via Silver Plating on Microfibers for Electromagnetic Interference Shielding[J]. Compos Sci Technol,2018,156:136-143.
[11] Hu H L,Zhang G,Zhao Z D,et al. Preparation and Electrical Conductivity of Graphene/Ultrahigh Molecular Weight Polyethylene Composites with a Segregated Structure[J]. Carbon,2012,50:4596-4599.
[12] Oren R,Paul N B,Joachim L. Preparation of Conductive Nanotube-Polymer Composites Using Later Technology[J]. Adv Mater,2004,16(3):248-251.
[13] Al-Saleh M H,Sundararaj U. An Innovative Method to Reduce Percolation Threshold of Carbon Black Filled Immiscible Polymer Blends[J]. Compos Part A-Appl Sci Manuf,2008,39(2):284-293.
[14] Wu H Y,Jia L C,Li Z M,et al. Simultaneously Improved Electromagnetic Interference Shielding and Mechanical Performance of Segregated Carbon Nanotube/Polypropylene Composite via Solid Phase Molding[J]. Compos Sci Technol,2018,156:87-94.
[15] Wu H Y,Zhang Y P,Li Z M,et al. Injection Molded Segregated Carbon Nanotube/Polypropylene Composite for Efficient Electromagnetic Interference Shielding[J]. Ind Eng Chem Res,2018,57(37):12378-12385.
[16] Zhang R,Baxendale M,Peijs T. Universal Resistivity-Strain Dependence of Carbon Nanotube/Polymer Composites[J]. Phys Rev B,2007,76:195433-195437.
[17] Deng H,Lin L,Fu Q,et al. Progress on the Morphological Control of Conductive Network in Conductive Polymer Composites and the Use as Electroactive Multifunctional Materials[J]. Prog Polym Sci,2014,39(4):627-655.