Multifunctional nanocomposites of poly(vinylidene fluoride) reinforced by carbon nanotubes and magnetite nanoparticles

Tsonos, Christos; Pandis, C.; Soin, Navneet; Sakellari, Dimitra; Myrovali, Eirini; Kripotou, S.; Kanapitsas, A.; Σιώρης, Ηλίας

doi:10.3144/expresspolymlett.2015.99

Cited by 74 publications

(36 citation statements)

References 52 publications

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“…FTIR spectra and β‐phase content of electrospun PVDF fibrous membranes thermo‐pressed at different pressures with increasing temperatures are shown in Figure . Figure (a) presents the characteristic bands corresponding to the crystalline phases, revealing that the bands at 760, 976, 1210, and 1383 cm −1 correspond to the α‐phase, while the ones at 840 and 1279 cm −1 are exclusively of the β‐phase, as mentioned in previous report . It can be seen that as for the pristine electrospun PVDF membrane, the β‐phase absorption bands are clearly identified at 840 and 1279 cm −1 , while the α‐phase absorption bands are very weak.…”

Section: Resultssupporting

confidence: 69%

“…Figure 4(a) presents the characteristic bands corresponding to the crystalline phases, revealing that the bands at 760, 976, 1210, and 1383 cm 21 correspond to the a-phase, while the ones at 840 and 1279 cm 21 are exclusively of the b-phase, as mentioned in previous report. 29,30 It can be seen that as for the pristine electrospun PVDF membrane, the b-phase absorption bands are clearly identified at 840 and 1279 cm 21 , while the a-phase absorption bands are very weak. As for the thermo treated electrospun PVDF membranes without pressure, the a-phase at 760 cm 21 becomes strong while the b-phase becomes weak and even disappears at 180 8C.…”

Section: Full Papermentioning

confidence: 95%

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Improving waterproof/breathable performance of electrospun poly(vinylidene fluoride) fibrous membranes by thermo‐pressing

Lin

Bian

et al. 2017

J Polym Sci B Polym Phys

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Facing the ever-increasing demand for waterproof/ breathable materials, a rapid and efficient fabrication method of these functional materials with excellent performance as well as robust mechanical properties remains challenging. Herein, a simple and scalable strategy referred to as thermopressing is introduced to improve the waterproof/breathable performance and mechanical properties of electrospun PVDF fibrous membranes. The synergistic effect of temperature and pressure acted on the electrospun PVDF membranes on the fiber morphology and crystal structure was investigated, which can be able to effectively enhance waterproof performance and mechanical properties, endowing the as-prepared membranes with a modest breathability. The membranes thermo-pressed at 150 8C with a pressure of 8.27 MPa exhibit robust tensile strength of 40.65 MPa, which is superior to those of the previous reports (below 32.8 MPa). Notably, the optimized membranes enable to show a high hydrostatic pressure of 102 kPa, good WVTR of 10.87 kg m 22 d 21 and excellent abrasion resistance, which implies that the thermo-pressing is an efficient and facile way to steer the fiber morphology and crystal structure of electrospun membranes to improve their application performance.

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Section: Resultssupporting

confidence: 69%

Section: Full Papermentioning

confidence: 95%

Improving waterproof/breathable performance of electrospun poly(vinylidene fluoride) fibrous membranes by thermo‐pressing

Lin

Bian

et al. 2017

J Polym Sci B Polym Phys

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“…3(a). The quantification of the β-phase in crystalline PVDF matrix relative to α-phase was carried out using the signature vibrational bands at 760 cm -1 (CF 2 bending and skeletal bending) and 840 cm -1 (CH 2 rocking and CF 2 asymmetric stretching vibration) [19,[30][31][32][33][34][35][36]. Upon phase inversion, a significant increase in the β-phase is achieved for the PVDF membranes, wherein the β-phase is enhanced to ~49% from an initial value of from ~35% for the starting PVDF pellets.…”

Section: Microstructural Characterisation Of Phase-inversion Membranesmentioning

confidence: 99%

High performance triboelectric nanogenerators based on phase-inversion piezoelectric membranes of poly(vinylidene fluoride)-zinc stannate (PVDF-ZnSnO3) and polyamide-6 (PA6)

et al. 2016

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Vertical contact-separation mode triboelectric generator (TEG) based on lead-free perovskite, zinc stannate (ZnSnO 3 )-polyvinylidene fluoride (PVDF) composite and polyamide-6 (PA6) membrane is demonstrated. For the 5wt% PVDF-ZnSnO 3 nanocomposites, the facile phaseinversion method provides a simple route to achieve high crystallinity and β-phase with a piezoelectric coefficient d 33 of -65 pmV -1 , as compared to -44 pmV -1 for pristine PVDF membranes. Consequently, at a cyclic excitation impact of 490 N/3 Hz, the PVDF-ZnSnO 3 /PA6 based TEGs provide a significantly higher voltage of 520 V and a current © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ 2 density of 2.7 mAm -2 (corresponding charge density of 62.0 µCm -2 ), as compared to the pristine PVDF-PA6 TEG which provides up to 300 V with a current density of 0.91 mAm -2(corresponding to a charge density of 55.0 µCm -2 ). This increase in the electrical output can be attributed to not only the enhanced polarisation of PVDF by ZnSnO 3 leading to an increase in the β-phase content, but also to the surface charge density increase by stress induced polarisation of ZnSnO 3 , leading to the generation of stronger piezoelectric potential.The work thus introduces a novel method of enhancing the surface charge density via the addition of suitable high polarization piezoelectric materials thus eliminating the need for prior charge injection for fluoropolymer membranes.

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“…The outstanding mechanical and conductive properties of carbon nanoparticles (CNPs), together with their unique structure and low density, place them among the most common fillers. Carbon nanofiber and carbon nanotubes (CNT) [14][15][16][17][18][19][20] 1,2 , N. Miklósi 1 and its derivatives [21][22][23][24], mainly graphene oxide (GO), have attracted marked interest in the last few years. In biomedical applications, however, the uncertainty surrounding the toxicity of CNTs [14] could affect choices of nanocarbon filler.…”

Section: Introductionmentioning

confidence: 99%

Thermal sensitivity of carbon nanotube and graphene oxide containing responsive hydrogels

Manek

Berke

Miklósi

et al. 2016

Express Polym. Lett.

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Abstract.Comparative investigations are reported on poly(N-isopropylacrylamide) (PNIPA) gels of various carbon nanotube (CNT) and graphene oxide (GO) contents synthesized under identical conditions. The kind and concentration of the incorporated carbon nanoparticles (CNPs) influence the swelling and stress-strain behaviour of the composites. Practically independently of the filler content, incorporation of CNPs appreciably improves the fracture stress properties of the gels. The time constant and the swelling ratio of the shrinkage following an abrupt increase in temperature of the swelling medium from 20 to 50°C can be adjusted by selecting both the type and the amount of nanoparticle loading. This offers a means of accurately controlling the deswelling kinetics of drug release with PNIPA systems, and could be employed in sensor applications where fast and excessive shrinkage are a significant drawback. Both CNTs and GO enhance the infrared sensitivity of the PNIPA gel, thus opening a route for the design of novel drug transport and actuator systems. It is proposed that the influence of the CNPs depends more on their surface reactivity during the gel synthesis rather than on their morphology. One of the important findings of this study is the existence of a thermally conducting network in the GO filled gels.

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Multifunctional nanocomposites of poly(vinylidene fluoride) reinforced by carbon nanotubes and magnetite nanoparticles

Cited by 74 publications

References 52 publications

Improving waterproof/breathable performance of electrospun poly(vinylidene fluoride) fibrous membranes by thermo‐pressing

Improving waterproof/breathable performance of electrospun poly(vinylidene fluoride) fibrous membranes by thermo‐pressing

High performance triboelectric nanogenerators based on phase-inversion piezoelectric membranes of poly(vinylidene fluoride)-zinc stannate (PVDF-ZnSnO3) and polyamide-6 (PA6)

Thermal sensitivity of carbon nanotube and graphene oxide containing responsive hydrogels

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