Depolymerizable semi-fluorinated polymers for sustainable functional materials
Depolymerizable semi-fluorinated polymers for sustainable functional materials
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DOI：
10.1039/d2py00240j
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发表时间：
2022-04-06
影响因子：
4.6
通讯作者：
Wang, Junpeng
中科院分区：
文献类型：
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作者：
Sathe, Devavrat;Zhou, Junfeng;Wang, Junpeng
氟化聚合物是一种重要的功能材料，具有广泛的应用，但目前氟化聚合物的回收利用是一个挑战。我们提出了半氟化聚合物的第一个例子，它可以在环境条件下进行化学循环以形成相应的单体。通过官能化反式环丁烷稠合环辛烯（tCBCO）单体的开环易位聚合制备，这些聚合物显示出可调的玻璃化转变温度（-2 ° C至88 ° C）、优异的热稳定性（分解起始温度>280 ° C）和疏水性（水接触角>90度）。半氟化聚合物的疏水性进一步用于两亲性二嵌段共聚物中，其在水溶液中形成具有类似于88 nm的尺寸的自组装胶束。最后，通过有效的、区域选择性的对氟硫醇取代反应，实现了具有五氟苯基酰亚胺取代基的聚合物的聚合后官能化。易于制备、官能化和回收，沿着不同的热机械性能和表现出的疏水性，使得基于tCBCO的可解聚半氟化聚合物成为可持续功能材料的有希望的候选物，其可以为循环经济提供解决方案。
Fluorinated polymers are important functional materials for a broad range of applications, but the recycling of current fluorinated polymers is challenging. We present the first example of semi-fluorinated polymers that can undergo chemical recycling to form the corresponding monomers under ambient conditions. Prepared through ring-opening metathesis polymerization of functionalized trans-cyclobutane fused cyclooctene (tCBCO) monomers, these polymers show tunable glass transition temperatures (-2 degrees C to 88 degrees C), excellent thermal stability (decomposition onset temperatures >280 degrees C) and hydrophobicity (water contact angles >90 degrees). The hydrophobicity of the semi-fluorinated polymers was further utilized in an amphiphilic diblock copolymer, which forms self-assembled micelles with a size of similar to 88 nm in an aqueous solution. Finally, through an efficient, regioselective para-fluoro-thiol substitution reaction, post-polymerization functionalization of a polymer with a pentafluorophenyl imide substituent was achieved. The ease of preparation, functionalization, and recycling, along with the diverse thermomechanical properties and demonstrated hydrophobicity make the tCBCO-based depolymerizable semi-fluorinated polymers promising candidates for sustainable functional materials that can offer a solution to a circular economy.