A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of the selective localization of carbon nanotubes in polystyrene/poly(vinylidene fluoride) blends on their dielectric, thermal, and mechanical properties
Highlights Employing two-step mixing process can make MWNTs localize in different phase successfully. The MWNTs selectively localize in the PVDF phase. The selective localization of MWNTs in the PVDF phase can offer composites higher dielectric performance.
Graphical abstract
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 3.9vol%, the selective localization of MWNTs in PVDF phase produces higher dielectric constant (ε′, ca. 485) than the case when the fillers are only in PS phase (ε′ of ca. 16) at 100Hz and room temperature of 25°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.
Effect of the selective localization of carbon nanotubes in polystyrene/poly(vinylidene fluoride) blends on their dielectric, thermal, and mechanical properties
Highlights Employing two-step mixing process can make MWNTs localize in different phase successfully. The MWNTs selectively localize in the PVDF phase. The selective localization of MWNTs in the PVDF phase can offer composites higher dielectric performance.
Graphical abstract
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 3.9vol%, the selective localization of MWNTs in PVDF phase produces higher dielectric constant (ε′, ca. 485) than the case when the fillers are only in PS phase (ε′ of ca. 16) at 100Hz and room temperature of 25°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.
Effect of the selective localization of carbon nanotubes in polystyrene/poly(vinylidene fluoride) blends on their dielectric, thermal, and mechanical properties
Zhao, Xiaodong (author) / Zhao, Jun (author) / Cao, Jian-Ping (author) / Wang, Dongrui (author) / Hu, Guo-Hua (author) / Chen, Fenghua (author) / Dang, Zhi-Min (author)
2013-11-28
9 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2014
| British Library Online Contents | 2014
| British Library Online Contents | 2014
| British Library Online Contents | 2010
| British Library Online Contents | 2011