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yexuqing木虫之王 (文学泰斗)
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聚合驱动自发组装形成长程扩展链
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Long-range extended chains arising from polymerization-driven spontaneous assembly 聚合驱动自发组装形成长程扩展链 ▲ 作者：MIN CHEN, DONGYANG WANG, YE ZOU, CHANGSHENG CHEN, XIXIAN YANG, LIXIN NIU, JIN WANG, LUCAS Q. FLAGG, AND JIANGUO MEI, etc. ▲链接： https://www.science.org/doi/10.1126/science.aef1777 ▲摘要： 共轭聚合物面临的一个核心挑战是在保持溶液可加工性的同时实现长程有序，这对于匹配晶体无机半导体材料的电学性能至关重要。研究表明，n型掺杂的聚苯并二呋喃二酮（n-PBDF）能够发生聚合驱动的自发组装，在此过程中链增长、化学掺杂和结构有序内在耦合，从而形成数百纳米尺度的长程链扩展。 研究表明，自发形成的n-PBDF纳米带源于一种自引发、收敛生长的机制，该机制由单体—聚合物协同相互作用驱动，并通过质子耦合的双链和聚合物本身固有的聚电解质特性得以稳定。凭借纳米带中长程扩展的链结构，取向排列的n-PBDF薄膜表现出金属级别的电导率（>10? S/cm）。 ▲ Abstract： A central challenge for conjugated polymers is to achieve long-range order while remaining solution processable, which is essential for matching the electrical performance of their counterparts of crystalline inorganic semiconductors. In this work, we show that n-doped poly(benzodifurandione) (n-PBDF) can undergo polymerization-driven spontaneous assembly (PSA), in which chain growth, chemical doping, and structural ordering are intrinsically coupled, yielding long-range chain extension over hundreds of nanometers. We reveal that the spontaneously formed n-PBDF nanoribbons arise from a self-initiated, convergent growth mechanism driven by cooperative monomer-polymer interactions and stabilized by proton-coupled duplex chains and the polymer’s intrinsic polyelectrolyte character. With long-range extended chains in the nanoribbons, the aligned n-PBDF thin films demonstrate metallic-level conductivity (>104 siemens per centimeter). |
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