Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education, Tianjin University , Tianjin 300072, P. R. China.
ACS Appl Mater Interfaces. 2013 Dec 11;5(23):12499-509. doi: 10.1021/am4037806. Epub 2013 Nov 20.
The high-volume resistivity and surface resistance of poly(ether ether ketone)/multiwalled carbon nanotubes (PEEK/MWCNT) composites restrict their use in an electronic field. To decrease the volume resistivity and surface resistance, we metalized the composites by electroless plating. The composites and metal coatings were characterized by SEM, XPS, AFM, EDX, and XRD spectroscopy. The swelling ratio of the composites, volume resistivity of two-side-coated composites, sheet resistance of plated composites, and adhesion between the coating and PEEK/MWCNT were tested. The results are as follows. A high roughness and a small swelling ratio were obtained by swelling in 18 mol/L H2SO4 for 3 min. Most of the MWCNT on the surface were still wrapped with PEEK after swelling. To expose the MWCNT, an environmentally friendly and effective etchant (MnO2-NaH2PO4-H2SO4) was used. After etching, not only were high roughness and partially exposed MWCNT obtained but also the percentage of hydrophilic groups on the surface was increased. A dense cauliflower-like Ni-P coating was produced, and the exposed MWCNT were embedded in the metal coating after electroless plating for 20 min. The coating exhibited an amorphous structure with a phosphorus content of 11.21 wt %. The volume resistivity of two-side-coated PEEK/MWCNT dropped sharply to 38 Ω·m after electroless plating for 5 min. The sheet resistance decreased with increasing the electroless-plating time, and it dropped to 0.88 Ω/square after electroless plating for 40 min. The adhesion of the coating reached the highest 5 B scale (ASTM D3359) and could even undergo the test 20 times.
高体积电阻率和表面电阻使聚醚醚酮/多壁碳纳米管（PEEK/MWCNT）复合材料在电子领域的应用受到限制。为了降低体积电阻率和表面电阻，我们通过化学镀对复合材料进行了金属化。通过 SEM、XPS、AFM、EDX 和 XRD 光谱对复合材料和金属涂层进行了表征。测试了复合材料的溶胀率、双面涂层复合材料的体积电阻率、电镀复合材料的片电阻以及涂层与 PEEK/MWCNT 之间的附着力。结果如下。在 18 mol/L H2SO4 中浸泡 3 分钟可获得高粗糙度和小的溶胀率。溶胀后，大部分表面上的 MWCNT 仍被 PEEK 包裹。为了暴露 MWCNT，使用了一种环保且有效的蚀刻剂（MnO2-NaH2PO4-H2SO4）。蚀刻后，不仅获得了高粗糙度和部分暴露的 MWCNT，而且表面的亲水性基团百分比也增加了。在化学镀 20 分钟后，生成了致密的菜花状 Ni-P 涂层，暴露的 MWCNT 嵌入金属涂层中。涂层具有非晶结构，磷含量为 11.21wt%。化学镀 5 分钟后，双面涂层 PEEK/MWCNT 的体积电阻率急剧下降至 38 Ω·m。随着化学镀时间的增加，片电阻逐渐降低，化学镀 40 分钟后降至 0.88 Ω/square。涂层的附着力达到最高的 5B 级（ASTM D3359），甚至可以经受 20 次测试。
