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首页> 外文期刊>RSC Advances >Influence of lithium salt-induced phase separation on thermal behaviors of poly(vinylidene fluoride)/ionic liquid gels and pore/void formation by competition with crystallization
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Influence of lithium salt-induced phase separation on thermal behaviors of poly(vinylidene fluoride)/ionic liquid gels and pore/void formation by competition with crystallization

机译：锂盐诱导的相分离对聚偏二氟乙烯/离子液体凝胶的热行为和与结晶竞争的孔/空隙形成的影响

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The thermal behavior of poly(vinylidene fluoride)/1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide/lithium bis(trifluoromethylsulfonyl)amide (PVDF/[C _(2) mim][TFSA]/LiTFSA) gels, prepared by cooling from the hot solution, was investigated with various concentrations of LiTFSA ( C _(LiTFSA) ). The peak melting temperature ( T _(m) ) of the gels shifted toward higher temperatures with increased C _(LiTFSA) . However, the thickness of lamellar crystal was found to decrease with the increase in C _(LiTFSA) , which meant that the increase in T _(m) was not caused by the thickening of lamellar crystal. Furthermore, we found the appearance of domains above T _(m) in the high C _(LiTFSA) region (≥20 wt%), which was a lithium ion-rich phase caused by the phase separation. Therefore, it is considered on the basis of Nishi–Wang equation that an increase in the interaction parameter with increasing C _(LiTFSA) toward the phase separation increased the T _(m) . The phase-separated domains competed with the subsequent crystallization, which resulted in the formation of micrometer-sized pores and nanometer-sized voids in the spherulites. Spectral measurements revealed that PVDF was not specifically solvated in the solution state above the crystallization temperature, while [TFSA] ~(?) anion formed a complex with lithium ion irrespective of the PVDF content. These results led to the consideration that an increase in the interaction parameter might be caused by the strong interaction between lithium ion and [TFSA] ~(?) anion to form the complex, which would also lower the interaction between PVDF and [TFSA] ~(?) anion.
机译：聚偏二氟乙烯/ 1-乙基-3-甲基咪唑双（三氟甲基磺酰基）酰胺/双（三氟甲基磺酰基）酰胺锂（PVDF / [C _（2）mim] [TFSA] / LiTFSA）凝胶的热行为用各种浓度的LiTFSA（C_（LiTFSA））研究了从热溶液中冷却的过程。随着C_（LiTFSA）的增加，凝胶的峰值熔融温度（T_（m））向更高的温度移动。然而，发现层状晶体的厚度随C _（LiTFSA）的增加而减小，这意味着T _（m）的增加不是由层状晶体的增厚引起的。此外，我们发现高C _（LiTFSA）区域（≥20 wt％）中T _（m）以上的区域出现，这是由相分离引起的富锂离子相。因此，根据Nishi-Wang方程可以认为，随着C _（LiTFSA）的增加，相互作用参数随着相分离的增加而增加T _（m）。相分离的畴与随后的结晶竞争，这导致在球晶中形成微米级的孔和纳米级的空隙。光谱测量表明，在高于结晶温度的溶液状态下，PVDF并没有特异地被溶剂化，而[TFSA]〜（α）阴离子与锂离子形成了络合物，而与PVDF的含量无关。这些结果导致认为，相互作用参数的增加可能是由于锂离子与[TFSA]〜（？）阴离子形成复合物之间的强相互作用而引起的，这也会降低PVDF与[TFSA]〜之间的相互作用。 （？）阴离子。

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