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Effect of the selective localization of carbon nanotubes in polystyrene/poly(vinylidene fluoride) blends on their dielectric, thermal, and mechanical properties

Abstract : The selective localization of multiwalled carbon nanotubes (MWNTs) in immiscible polystyrene (PS)/ poly(vinylidene fluoride) (PVDF) blends (volume ratio of both components is 1/1) and its effect on composites' dielectric, thermal, and mechanical properties are systematically studied. Employing two-step mixing process can make MWNTs localize in PS or PVDF phase successfully. When three components are simply mixed together by one-step processing, the MWNTs are selectively distributed in PVDF phase, which is supported by the dielectric measurements and the SEM observations and is consistent with the wetting coefficient evaluation. For the two-step mixing, when the fillers are first mixed with PS in the first step, some of them will migrate into PVDF phase in the second step although the migration is very slow. When the overall volume fraction of MWNTs is 3.9 vol%, the selective localization of MWNTs in PVDF phase produces higher dielectric constant (e0, ca. 485) than the case when the fillers are only in PS phase (e0 of ca. 16) at 100 Hz and room temperature of 25 degrees C. Differential scanning calorimetry (DSC) measurements and mechanical tests show that the selective localization of all the fillers in PVDF phase produces little change of the melting point and crystallinity of PVDF component but slightly higher tensile strength. In contrast to the one-step mixing process, the two-step mixing to selectively localize the fillers in their favorite phase could be used to control the dielectric and mechanical properties of the materials.
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https://hal.univ-lorraine.fr/hal-01275726
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Submitted on : Thursday, February 18, 2016 - 9:35:51 AM
Last modification on : Monday, March 29, 2021 - 4:06:42 PM

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Xiaodong Zhao, Jun Zhao, Jian-Ping Cao, Dongrui Wang, Guo-Hua Hu, et al.. Effect of the selective localization of carbon nanotubes in polystyrene/poly(vinylidene fluoride) blends on their dielectric, thermal, and mechanical properties. Materials and Design, Elsevier, 2014, 56, pp.807-815. ⟨10.1016/j.matdes.2013.11.073⟩. ⟨hal-01275726⟩

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