Ultra-Strong and Proton Conductive Aqua-Based Adhesives from Facile Blending of Polyvinyl Alcohol and Tungsten Oxide Clusters
Ultra-Strong and Proton Conductive Aqua-Based Adhesives from Facile Blending of Polyvinyl Alcohol and Tungsten Oxide Clusters
复制标题
由聚乙烯醇和氧化钨簇轻松混合而成的超强质子传导水基粘合剂
DOI：
10.1002/adfm.202111892
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发表时间：
2022-05-03
影响因子：
19
通讯作者：
Yin, Panchao
中科院分区：
文献类型：
--
作者：
Chen, Jiadong;Dong, Zhenchuan;Yin, Panchao
粘合剂工业的爆炸式增长刺激了强胶粘剂的发展，这些胶粘剂兼具多功能、高成本效益和环保可加工性。聚乙烯醇（PVA）和亚纳米级金属氧化物团簇磷钨酸（PTA）在水中通过氢键络合，两者都具有广泛的商业用途。获得的纳米复合材料具有良好的透光性和质子导电性，最重要的是，在典型的玻璃基板上，具有前所未有的高粘附强度，剥离强度接近4 kN m(-1)，单次剪切强度为8.2 +/- 1.7 MPa。PVA与PTA的超分子络合可以显著降低其结晶度，加速PVA链动力学，使其在干燥时内应力和膜收缩可以忽略，从而与玻璃基板紧密接触，具有很强的附着力。同时，PVA和PTA之间的超分子相互作用提高了纳米复合材料的机械强度，解决了粘聚失效问题，保证了高粘接强度。快速链动力学也有利于质子的快速传输，有助于提高质子的电导率。粘合剂设计协议可以扩展到具有所需功能的一般聚合物系统，并允许扩大加工规模，为安全玻璃和电子工业的功能粘合剂提供了巨大的机会。
The explosive growth of binder industry spurs the development of strong adhesives with the integration of multi-functionalities as well as cost-effective and eco-friendly processability. Here, polyvinyl alcohol (PVA) and sub-nanoscale metal oxide cluster, phosphotungstic acid (PTA), both with broad commercial availability, are complexed through hydrogen bonding in water. The obtained nanocomposites demonstrate promising light transmittance and proton conductivity, and most importantly, unprecedentedly high adhesive strengths as approximate to 4 kN m(-1) for peeling strength and 8.2 +/- 1.7 MPa for single lap shear strength on typical glass substrate. The supramolecular complexation of PVA with PTA can significantly reduce its crystallinity and accelerate PVA chain dynamics for negligible internal stress and membrane shrinkage upon drying, leading to close contact with glass substrates for strong adhesion. Meanwhile, the supramolecular interaction between PVA and PTA contributes to the nanocomposites' enhanced mechanical strength and resolves the issue of cohesion failure to ensure high adhesive strengths. The fast chain dynamics also benefit rapid proton transportation, contributing to the high proton conductivities. The binder design protocol can be extended to general polymer systems integrated with desired functionalities and allows scale up processing, providing great opportunities for functional adhesives for safety glass and electronic industry.