通过缺陷网络设计实现室温自愈合玻璃态热固性聚合物

IF 9.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY CCS Chemistry Pub Date : 2024-08-06 DOI:10.31635/ccschem.024.202404486
Hao Wang, Biqiang Jin, Haitao Wu, Changcheng Wang, Jinrong Wu
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引用次数: 0

摘要

玻璃状热固性聚合物具有优异的机械性能、结构稳定性和耐溶剂性,但由于其交联网络不可逆,因此无法愈合和回收。共价自适应网络可以解决这些缺点,因为其化学网络能够通过交换反应对动态共价键进行洗牌,但这需要高温或溶剂的辅助。在此,我们报告了一种室温自愈合玻璃态热固性材料,它是通过设计一种带有大量悬垂链(即通常所说的网络 "缺陷")的二硫键和氢键杂化网络实现的。不过,这些 "缺陷 "不会使聚合物塑化,因为它们通过 H 键与网络链结合在一起。因此,这种聚合物在室温下具有很高的模量和强度。重要的是,这些 "缺陷 "可以推动二硫键的偏析反应和玻璃态 H 键的重新排列,从而使热固性网络在室温甚至低于室温的条件下自我修复。
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Room-Temperature Self-Healing Glassy Thermosetting Polymers via Defective Network Design

Glassy thermosetting polymers, which possess excellent mechanical properties, structural stability, and solvent resistance, cannot be healed and recycled due to the irreversible crosslinking network. Covalent adaptive networks could address these drawbacks, as their chemical networks are able to shuffle dynamic covalent bonds through exchange reactions, which nevertheless need high temperature or solvent assistance. Here we report a room-temperature self-healing glassy thermoset enabled by designing a disulfide-bond and H-bond hybridized network carrying abundant dangling chains, which are commonly known as network “defects.” However, the “defects” do not plasticize the polymer, as they are bound to network chains through H-bonds. Therefore, the polymer possesses high modulus and strength at room temperature. Importantly, the “defects” can drive the metathesis reaction of disulfide bonds and the rearrangement of H-bonds in the glassy state, enabling the thermosetting network to self-heal at and even below room temperature.

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来源期刊
CCS Chemistry
CCS Chemistry Chemistry-General Chemistry
CiteScore
13.60
自引率
13.40%
发文量
475
审稿时长
10 weeks
期刊介绍: CCS Chemistry, the flagship publication of the Chinese Chemical Society, stands as a leading international chemistry journal based in China. With a commitment to global outreach in both contributions and readership, the journal operates on a fully Open Access model, eliminating subscription fees for contributing authors. Issued monthly, all articles are published online promptly upon reaching final publishable form. Additionally, authors have the option to expedite the posting process through Immediate Online Accepted Article posting, making a PDF of their accepted article available online upon journal acceptance.
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