Effect of ionic liquid on crystallization kinetics and crystal form transition of poly(vinylidene fluoride) blends
Effect of ionic liquid on crystallization kinetics and crystal form transition of poly(vinylidene fluoride) blends
复制标题
离子液体对聚偏二氟乙烯共混物结晶动力学和晶型转变的影响
DOI：
10.1007/s10973-018-7029-x
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发表时间：
2018-05-01
影响因子：
4.4
通讯作者：
Wang, Limin
中科院分区：
文献类型：
--
作者：
Zhang, Hao;Shi, Weihe;Wang, Limin
与离子液体（IL）结合的半晶聚（偏二氟乙烯）（PVDF）表现出作为电解质的适用性。本文利用差示扫描量热法、傅里叶变换红外光谱（FTIR）和X射线散射研究了PVDF与离子液体（1-己基-3-甲基氯化咪唑鎓，[HMIM]Cl）共混的结晶动力学和晶型转变。 PVDF/[HMIM]Cl共混物的Tg高于纯PVDF，表明[HMIM]Cl与PVDF分子链之间存在强相互作用。当[HMIM]Cl含量相同时，随着离子液体含量的增加，溶剂浇铸膜和再加热膜的电导率均增加，且两者差异不大。为了归一化，我们引入相对时间tr来代替t以消除冷却速率的影响。从结晶动力学来看，纯 PVDF 具有最快的结晶速率。通过添加[HMIM]Cl，tr1/2与PVDF/[HMIM]Cl共混物的结晶度呈正相关，而XtA与结晶度呈负相关。此外，[HMIM]Cl在再结晶过程中促进了PVDF β相的形成，这一点通过FTIR和X射线散射得到证实。该研究为高质量凝胶聚合物电解质的开发提供了线索。
Semicrystalline poly(vinylidene fluoride) (PVDF) incorporated with ionic liquids(IL) exhibits applicability as electrolyte. In this paper, crystallization kinetics and crystal form transition of PVDF blending with ionic liquid (1-hexyl-3-methylimidazolium chloride, [HMIM]Cl) were studied by using differential scanning calorimetry, Fourier transform infrared spectroscopy (FTIR), and X-ray scattering. Tg of the PVDF/[HMIM]Cl blends are higher than that of the pure PVDF, suggesting the strong interaction between [HMIM]Cl and molecular chains of PVDF. With the ionic liquid content increased, both the conductivities of solvent casting and reheated films increased with little difference between them when the [HMIM]Cl content is same. For normalization, we introduce relative time tr to replace t to eliminate the influence of cooling rate. Pure PVDF had the fastest crystallization rate through the crystallization kinetics. By addition of the [HMIM]Cl, the tr1/2 has a positive correlation, while the XtA has negative correlation with the degree of crystallization of the PVDF/[HMIM]Cl blends. What’s more, [HMIM]Cl promotes the formation of PVDF β phase during the recrystallization process, which is confirmed by FTIR and X-ray scattering. This study gives a clue for the development of high-quality gel polymer electrolytes.