Cross-linked networks that selectively and controllably disassemble on-demand via cascading bond cleavage,Materials Horizons

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Cross-linked networks that selectively and controllably disassemble on-demand via cascading bond cleavage
Materials Horizons ( IF 12.2 ) Pub Date : 2018-06-06 , DOI: 10.1039/c8mh00117k
Grant C. Daniels _{1,

2,

3,

4} , Eugene Camerino _{1,

2,

3,

4,

5} , James H. Wynne _{1,

2,

3,

4} , Erick B. Iezzi _{1,

2,

3,

4}

Affiliation

Cross-linked polymeric networks are found in numerous consumer, medical, and industrial materials. However, these materials require harsh chemical treatments to degrade their covalently bonded and tangled matrix of chains, often leading to environmental and safety issues. Herein, we describe the first networks, silyl-containing polyurethanes, which are highly cross-linked, rigid, and possess good thermal stability, yet will disassemble in multiple directions via cascading bond cleavage upon exposure to a selective chemical stimulus. These materials are formed from aliphatic polyisocyanates and synthesized silyl-diols with varying electrophilicity and chain lengths, and disassembly is initiated by reaction with mild fluoride ion to release small molecules via slightly different mechanisms, which enables the time of disassembly to be controlled. These silyl-containing polyurethanes are resistant to disassembly with strong acid and base, which demonstrates their selectivity and robustness compared to other degradable cross-linked materials.

中文翻译：

通过级联键裂解可选择性和可控地按需拆卸的交联网络

交联的聚合物网络存在于众多消费，医疗和工业材料中。但是，这些材料需要经过严格的化学处理才能降解其共价键和缠结的链基质，通常会导致环境和安全问题。在这里，我们描述了第一个网络，含甲硅烷基的聚氨酯，其高度交联，刚性且具有良好的热稳定性，但在暴露于选择性化学刺激下会通过级联键断裂在多个方向上分解。这些材料由具有不同亲电性和链长的脂肪族多异氰酸酯和合成的甲硅烷基二醇形成，并且通过与轻度的氟离子反应以通过小分子释放小分子而引发分解略有不同的机制，可以控制拆卸时间。这些含甲硅烷基的聚氨酯具有抗强酸和强碱分解的能力，与其他可降解的交联材料相比，具有选择性和坚固性。

更新日期：2018-08-29

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