Influence of Microcrystalline Cellulose on The Structure and Properties of PVDF/1-Allyl-3- methylimidazolium Chloride Composite Materials

In this study, the solution-casting method was utilized to prepare poly(allylidene fluoride)(PVDF)/1-allyl-3-methylimidazolium chloride ([AMIM]Cl)/microcrystalline cellulose (MCC) composite films at 100°C. Besides, investigations were conducted on the synergistic effect of [AMIM]Cl and MCC on the crystalline phase of PVDF and the dielectric property of the composites. The results show that the presence of [AMIM]Cl induced the formation of β-PVDF due to the ion-dipole interactions and increased the permittivity and dielectric loss. In the PVDF/[AMIM]Cl/MCC ternary composites, [AMIM]Cl significantly reduced the size of MCC and promoted its dispersion, which led to the further marked increase in permittivity and decrease in dielectric loss. With the addition of 7% [AMIM]Cl and 10% MCC, the permittivity rose to 135.15 while the loss decreased to only 0.71. Therefore, this work provides an efficient strategy to prepare PVDF-based composites with high permittivity and low dielectric loss, which holds sound promise for the development of high-performance materials in electronic devices and dielectric applications.