Anisotropically Functionalized Nanotube Anchors for Improving the Mechanical Strength of Immiscible Polymer Composites
Anisotropically Functionalized Nanotube Anchors for Improving the Mechanical Strength of Immiscible Polymer Composites
复制标题
用于提高不混溶聚合物复合材料机械强度的各向异性功能化纳米管锚
DOI：
10.1021/acsanm.0c02886
复制
发表时间：
2021
影响因子：
5.9
通讯作者：
Crossley, Steven
中科院分区：
文献类型：
--
作者：
Barrett, Lawrence;Ide Seyni, Fatoumata;Komarneni, Mallikharjuna Rao;Zapata-Hincapie, John A.;Glatzhofer, Daniel T.;Grady, Brian P.;Crossley, Steven
由于大多数聚合物的不相容性和相应界面的脆弱性，塑料回收受到限制。这里，描述了以可扩展的方式合成嵌段纳米管的方法，并且示出了其中这些纳米管增强聚合物-聚合物界面的一个示例。该方法依赖于在生长期间将氮原子选择性地结合在纳米管结构内。通过快速改变反应环境，产生沿纳米管长度沿着的氮官能团的嵌段。利用氮原子附近的纳米管的局部电子环境和自由基清除特性的变化，选择性地将苯乙烯从氮原子结合的纳米管壁中除去。这些双嵌段功能化的纳米管被放置在聚（甲基丙烯酸甲酯）/聚苯乙烯（PMMA/PS）界面，并通过不对称双悬臂梁测试的断裂韧性。的界面的断裂韧性被发现增加超过1000%相比，裸露的界面和400%以上的界面与非官能化的纳米管。
Plastic recycling is limited due to the immiscibility of most polymers and the weakness of the corresponding interface. Here, a method to synthesize block nanotubes in a scalable manner is described, and one example is shown where these nanotubes strengthen polymer–polymer interfaces. The method relies on the incorporation of nitrogen atoms selectively within the nanotube structure during growth. By rapidly changing the reaction environment, blocks of nitrogen functionality along the length of the nanotube result. The change in the local electronic environment and radical scavenging property of the nanotube near the nitrogen atoms was used to selectively polymerize styrene from the nanotube wall where nitrogen is incorporated. These diblock-functionalized nanotubes were placed at a poly(methyl methacrylate)/polystyrene (PMMA/PS) interface, and the fracture toughness was measured by the asymmetrical double cantilever beam test. The fracture toughness of the interface was found to increase by over 1000% compared to that of the bare interface and 400% over the interface with nonfunctionalized nanotubes.