Electrophysical behavior of ion-conductive organic-inorganic polymer system based on aliphatic epoxy resin and salt of lithium perchlorate

Abstract

In the present work, ion-conductive hybrid organic-inorganic polymers based on epoxy oligomer of diglycide aliphatic ester of polyethylene glycol (DEG) and lithium perchlorate (LiClO4) were synthesized. The effect of LiClO4 content on the electrophysical properties of epoxy polymers has been studied by differential scanning calorimetry (DSC) and broadband dielectric spectroscopy (BDS). The effect of LiClO4 content on the structure has been studied by wide-angle X-ray scattering (WAXS). It was found that LiClO4 impacts on the structure of the synthesized hybrid epoxy polymers, probably, by formation of coordinative complexes {ether oxygen-lithium cations-ether oxygen} as evidenced from a significant increase in their glass transition temperatures with increasing LiClO4 concentration and WAXS studies. The presence of ether oxygen in DEG macromolecules provides a transfer mechanism of the lithium cations with the ether oxygen similar to polyethylene oxide (PEO). Thus, the obtained hybrid polymers have high values of ionic conductivity σ' (approximately 10−3 S/cm) and permittivity ϵ' (6 × 105) at elevated temperatures (200°С). On the other hand, DEG has higher heat resistance compared to PEO that makes these systems perspective as solid polymer electrolytes able to operate at high temperature.PACS81.07.Pr; 62.23.St; 66.30.hk

Structural Peculiarities of Ion-Conductive Organic-Inorganic Polymer Composites Based on Aliphatic Epoxy Resin and Salt of Lithium Perchlorate

“…Analysis of the DSC studies as well as of the dielectric and electrical investigations of the synthesized composites with lithium perchlorate salt content from 0 to 20 phr was previously presented in our paper [ 22 ]. Further widening of LiClO 4 content (from 0 to 50 phr) maintains linear increase of glass transition temperature T g from −10 to 64 °C (Fig.…”

Structure-Morphology-Antimicrobial and Antiviral Activity Relationship in Silver-Containing Nanocomposites Based on Polylactide

“…Thus, the boundary layer on the surface of the filler with distended molecular packaging provides greater mobility of the segments of macromolecules, which reduces the glass transition temperature of the samples. It should be noted that the effect of the nanofiller on the value of T g can be different depending on the role it plays, for example in [42,43] a linear increase in the glass transition temperature with increasing filler content was observed, where its interaction with the polymer matrix led to the creation of the complexes and restrictions in molecular mobility.…”

“…provides greater mobility of the segments of macromolecules, which reduces the glass transition temperature of the samples. It should be noted that the effect of the nanofiller on the value of Tg can be different depending on the role it plays, for example in [42,43] a linear increase in the glass transition temperature with increasing filler content was observed, where its interaction with the polymer matrix led to the creation of the complexes and restrictions in molecular mobility. Also, the cold crystallization temperature Tccr of the studied samples shifts to the low-temperature region with increasing nanofiller content (Figure 6b).…”

Influence of Lithium Perchlorate on Structure of Epoxy Polymeric Composites

“…Зокрема, епоксидний олігомер ДЕГ-1, затверднення якого виконували поліетиленполіаміном (ПЕПÀ), характеризується близьким упорядкуванням при трансляції в просторі фраґментів його міжвузлових молекулярних ланок. Про це свідчить прояв на його дифрактограмі одного дифракційного максимуму дифузного (виходячи з його кутової напівширини) типу (аморфного гало), кутове положення (2 m ) якого становить близько 20,0 [12]. Середня величина періоду (d) близького упорядкування міжвузлових молекулярних ланок ДЕГ при розміщенні їх у просторі (в об'ємі полімеру), згідно з Бреґґовим рівнянням: Відсутність інтенсивних смуг поглинання в ІЧ-спектрі зразка ДЕГ-1-ПЕПÀ без вмісту солі (рис.…”