Abstract
Polypropylene (PP) and polyvinylidene fluoride (PVDF) polymer materials have been widely used because PP has excellent piezoelectricity and PVDF has a robust tensile strength. However, few studies have been reported about PP/PVDF blends, and the main issue has proven to be the interfacial compatibility of blends. This research investigated the microstructure of blends to characterize their compatibility. X-ray diffraction (XRD) and scanning electron microscope (SEM) analysis showed the poor interactions between PP and PVDF interface, and thus this study adopted styrene maleic anhydride (SMA) copolymer as compatibilizer to modify the properties of blends. The XRD and SEM investigations showed an enhancement in the interactions between PP and PVDF after the addition of SMA. The dielectric properties of PP/SMA/PVDF blends showed a significant increase when PP content was 40%–60% and the dielectric constant (ε) was up to 13; meanwhile, the dielectric loss (tanδ) of PP/SMA/PVDF was lower than PP/PVDF blends.
Highlights
Requirements for polymer materials have gradually increased with the development of technology [1,2]
The dielectric properties of PP/styrene maleic anhydride (SMA)/Polyvinylidene fluoride (PVDF) blends showed a significant increase when PP content was 40%–60% and the dielectric constant (ε) was up to 13; the dielectric loss of PP/SMA/PVDF was lower than polypropylene/polyvinylidene fluoride fluoride (PP/PVDF) blends
The blends comprised of PVDF and other organic materials have demonstrated that the organic–polymer composites possess very distinct dielectric properties that can be applied in electrics, such as hydroacoustic sensors and medical applications [8,9,10,11]
Summary
Requirements for polymer materials have gradually increased with the development of technology [1,2]. Polyvinylidene fluoride (PVDF) is known as the polymer with the best dielectric properties, and has stable chemical and mechanical performance. There are anhydride groups on the backbone structure of SMA which result in various reactions with other groups and produce derivatives that enhance the interactions between two polymers [8]. There are some studies about the dielectric properties of PP/PVDF blends [15,16], few correlate the results with the microstructures of blends. This research studies the correlation between blend microstructures and dielectric properties. Some discussions about the relationships between microstructures and dielectric properties of blends are presented and are followed by conclusions of the research
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