Visible-light reversible photopolymerisation: insights via online photoflow – electrospray ionisation – mass spectrometry,Polymer Chemistry

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Visible-light reversible photopolymerisation: insights via online photoflow – electrospray ionisation – mass spectrometry
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-09-30 , DOI: 10.1039/d0py01119c
Matthias Van De Walle _{1,

2,

3,

4,

5} , Charlotte Petit _{1,

2,

3,

4,

5} , James P. Blinco _{1,

2,

3,

4,

5} , Christopher Barner-Kowollik _{1,

2,

3,

4,

5}

Affiliation

Light as a non-invasive and clean external stimulus provides a facile route towards macromolecular design. Herein, we demonstrate the scalable synthesis of catalyst-free, visible-light mediated photo-oligomers and -polymers via a step-growth mechanism. Both a batch approach and a continuous photoflow setup are employed to investigate the degree of polymerisation and scalability. Violet blue light at 415 nm triggers [2 + 2]-cycloadditions of a pyrene-chalcone derivative to grow linear step-growth polymers, while subsequent UV-B light irradiation triggers the depolymerisation. The process was monitored online via a photoflow – high resolution electrospray ionisation mass spectrometry setup (ESI-MS). Size exclusion chromatography provides additional offline analysis of both the polymerisation and photodegradation over time. By changing the colour of light, photopolymers can be recycled and reshaped, allowing these macromolecular precursors to be applied to reversible and photodegradable material design.

中文翻译：

可见光可逆光聚合：通过在线光流获得的见解–电喷雾电离–质谱

光作为一种非侵入性的清洁外部刺激，为大分子设计提供了一条便捷的途径。在本文中，我们证明了无催化剂，可见光介导的光低聚物和聚合物通过逐步生长机理的可扩展合成。批处理方法和连续光流设置都用于研究聚合度和可扩展性。415 nm的紫色蓝光触发[-查耳酮衍生物的[2 + 2]-环加成反应，以生长线性逐步增长的聚合物，而随后的UV-B光照射触发解聚反应。该过程通过以下方式在线监控光流–高分辨率电喷雾电离质谱仪（ESI-MS）。体积排阻色谱提供了随时间推移聚合和光降解的附加离线分析。通过改变光的颜色，光聚合物可以被回收和重塑，从而允许将这些大分子前体应用于可逆和可光降解的材料设计。

更新日期：2020-10-08

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