Photo-responsive lignin fragment-based polymers as switchable adhesives
Photo-responsive lignin fragment-based polymers as switchable adhesives
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作为可切换粘合剂的光响应木质素片段聚合物
DOI：
10.1039/d2py01474b
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发表时间：
2023
影响因子：
4.6
通讯作者：
Saito Kei
中科院分区：
文献类型：
--
作者：
Sinha Roy Pallabi;Mention Matthieu M.;Patti Antonio F.;Garnier Gil;Allais Florent;Saito Kei
易于拆卸和可重复使用的粘合剂作为一次性粘合剂替代品具有吸引力，以减少浪费并促进重复使用，回收利用甚至升级循环选择。木质素，第二大最丰富的聚合物和纸浆工业的副产品，被用来设计一种新型的，高度可调的可逆聚合物粘合剂。所采用的方法是利用本工作中使用木质素氧化化合物合成的对羟基肉桂酸结构的α，β-不饱和酯部分的光响应性质，并进行改性以实现可逆的粘附切换。可逆性是通过暴露于紫外线来实现的，紫外线切割最初由酯的α，β-不饱和键形成的共价环丁烷环，这软化了材料并使其易于分离。原始聚合物结构可以通过再交联再次建立，以提供可再加工性。采用实验设计（DoE）方法对重要变量进行优化，以获得最佳的粘合剂搭接剪切强度。各种结构方面的效果显示出结构的高可调性，以满足性能要求。从可再生资源的聚合物粘合剂的设计策略，沿着的结构-性能分析机制，在这项工作中描述的，可以实施工程新的生物基和可重复使用的粘合剂。
Easily detachable and reusable adhesives are attractive as single-use adhesive replacements to reduce waste and promote reuse, recycling, or even upcycling options. Lignin, the second most abundant polymer and a byproduct of the paper-pulp industry, was utilized to design a novel, highly tunable reversible polymer adhesive. The approach adopted was to take advantage of the photo-responsive property of the α,β-unsaturated ester moiety of the p-hydroxycinnamic acid structure synthesized in this work using lignin-oxidation compounds and modified to attain reversible adhesion switching. The reversibility is achieved by the exposure of UV light that cleaves the covalent cyclobutane rings originally formed from the α,β-unsaturated bond of the ester, which softens the material and makes it easily separable. The original polymer structure can be established again by recrosslinking to offer reworkability. The design of experiments (DoE) method was introduced to optimize the significant variables to achieve optimum lap shear strength for the adhesive. The effect of various structural aspects shows a high tunability of the structure to meet the property requirements. The design strategy of the polymer adhesive from renewable resources, along with the structure–property analysis mechanisms described in this work, can be implemented to engineer new bio-based and reusable adhesives.