Albehaijan Hamad A, Piedrahita Camilo R, Cao Jinwei, Soliman Maria, Mitra Susanta, Kyu Thein
Department of Polymer Engineering , University of Akron , Akron , Ohio 44325 , United States.
SABIC Plastic Applications Development Center (SPADC) , Riyadh 12373 , Kingdom of Saudi Arabia.
ACS Appl Mater Interfaces. 2020 Feb 12;12(6):7518-7528. doi: 10.1021/acsami.9b15599. Epub 2020 Jan 29.
The role of side-chain branching in flexoelectric properties of a flexible, ionic solid polymer electrolyte membrane (PEM) has been investigated subjected to mechanical bending. These PEMs were synthesized via photopolymerization of the bifunctional poly(ethylene glycol) diacrylate (PEGDA) network attached with monofunctional poly(ethylene glycol) methyl ether acrylate (PEGMEA) branches in their ternary mixtures with lithium bis(tri-fluoromethane sulfonyl) imide (LiTFSI) salt. Both the PEGDA polymer precursor and PEGDMA side branches are capable of ionizing the lithium salt, but the dissociated lithium cations can also form the complexation with ether oxygen of PEGDA. With increasing PEGMEA content, not only the glass transition temperature is lowered, but also the ionic conductivity increases with temperature, which may be attributed to plasticization by dangling PEGMEA side chains. The flexoelectric responses of PEMs were investigated under various intermittent and oscillatory cantilever bending modes as a function of PEM composition and frequency. Last but not the least, the mechanoelectrical energy conversion was evaluated for various PEGDA/PEGMEA compositions and discussed its potential applications in energy harvesting from natural resources such as wind and wave motions.
研究了侧链支化在柔性离子固体聚合物电解质膜（PEM）的挠曲电性能中的作用，该膜承受机械弯曲。这些PEM是通过双官能聚乙二醇二丙烯酸酯（PEGDA）网络与单官能聚乙二醇甲基醚丙烯酸酯（PEGMEA）支链在与双（三氟甲烷磺酰）亚胺锂（LiTFSI）盐的三元混合物中进行光聚合反应合成的。PEGDA聚合物前体和PEGDMA侧链都能够使锂盐电离，但解离的锂阳离子也能与PEGDA的醚氧形成络合物。随着PEGMEA含量的增加，不仅玻璃化转变温度降低，而且离子电导率随温度升高，这可能归因于PEGMEA悬垂侧链的增塑作用。在各种间歇和振荡悬臂弯曲模式下，研究了PEM的挠曲电响应与PEM组成和频率的关系。最后但同样重要的是，评估了各种PEGDA/PEGMEA组成的机电能量转换，并讨论了其在从风能和波浪能等自然资源中收集能量方面的潜在应用。
