Optimization of adhesive performance of waterborne poly(urethane-urea)s for adhesion on high and low surface energy surfaces
Optimization of adhesive performance of waterborne poly(urethane-urea)s for adhesion on high and low surface energy surfaces
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DOI：
10.1016/j.porgcoat.2019.105495
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发表时间：
2020-03-01
影响因子：
6.6
通讯作者：
Tercjak, Agnieszka
中科院分区：
文献类型：
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作者：
Diez-Garcia, Inigo;Keddie, Joseph L.;Tercjak, Agnieszka
在设计新型软粘合剂时，实现对低表面能材料的粘合是一个挑战。考虑到这个问题，制备了基于聚环氧乙烷（PEO）均聚物和聚（环氧乙烷-b-环氧丙烷-b-环氧乙烷）（PEO-b-PPO-b-PEO）和聚（环氧丙烷-b-环氧乙烷-b-环氧丙烷）（PPO-b-PEO-b-PPO）三嵌段共聚物的水性聚（聚氨酯-脲）（WPUU）分散体。由分散体浇铸的粘合剂在低表面能聚丙烯（PP）探针上比在高表面能钢探针上表现出更好的粘附力。此外，为了提高压敏粘合剂（PSA）应用中WPUU的粘合性能，设计了双层系统。它们是使用两种具有不同粘弹性行为的 WPUU（一种更像固体，另一种更像液体）来制备的，以产生粘弹性特性的梯度。这种策略导致粘合剂材料在使用钢探针进行探针粘性测量时表现出原纤化，这是PSA的典型特征。最后，由双层系统之一制备原型胶带。这些胶带在剥离测试中的表现与国内商用胶带类似，这使得它们对于潜在应用很感兴趣。
Achieving adhesion to materials with a low surface energy is a challenge when designing new soft adhesives. With this question in mind, waterborne poly(urethane-urea) (WPUU) dispersions based on poly(ethylene oxide) (PEO) homopolymer and poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) (PEO-b-PPO-b-PEO) and poly (propylene oxide-b-ethylene oxide-b-propylene oxide) (PPO-b-PEO-b-PPO) triblock copolymers were prepared. Adhesives cast from the dispersions exhibited better adhesion on a low surface energy polypropylene (PP) probe than on a high surface energy steel probe. Moreover, with the aim of improving the adhesive performance of the WPUUs for pressure sensitive adhesive (PSA) applications, bilayer systems were designed. They were prepared using two WPUUs with differing viscoelastic behavior (one more solid-like and the other one, more liquid-like) to create a gradient in the viscoelastic properties. This strategy led to adhesive materials that exhibited fibrillation during probe tack measurements using a steel probe, which is typical of PSAs. Finally, prototype adhesive tapes were prepared from one of the bilayer systems. These adhesive tapes performed in a peel test in a similar way as a domestic commercial adhesive tape, making them interesting for that potential application.