Thermal stability of styrene grafted and sulfonated proton conducting membranes based on poly(vinylidene fluoride)

1998 ◽  
Vol 8 (5) ◽  
pp. 1127-1132 ◽  
Author(s):  
Sami Hietala ◽  
Mihkel Koel ◽  
Eivind Skou ◽  
Matti Elomaa ◽  
Franciska Sundholm
Keyword(s):  
Thermal Stability ◽  
Vinylidene Fluoride ◽  
Proton Conducting ◽  
Poly Vinylidene Fluoride ◽  
Conducting Membranes ◽  
Thermal Stability Of

Crystallization Behaviours of Poly(vinylidene fluoride) (PVDF) Nanocomposites with MoS2 Nanosheets with Different Surface Functional Groups

2020 ◽  
Vol 20 (12) ◽  
pp. 7535-7543
Author(s):  
Guihai Gan ◽  
Cheng Wang ◽  
Pengpeng Chen ◽  
Jichang Liu
Keyword(s):  
Thermal Stability ◽  
Crystallization Temperature ◽  
Vinylidene Fluoride ◽  
Crystallization Rate ◽  
Cold Crystallization ◽  
Degree Of Crystallinity ◽  
Mos2 Nanosheets ◽  
Surface Functional Groups ◽  
Poly Vinylidene Fluoride ◽  
Thermal Stability Of

The crystallization behaviours of amorphous poly(vinylidene fluoride) (PVDF) nanocompositesmodified with two different kinds of molybdenum disulfide (MoS2) at different filler loadings were investigated in detail in this work. The crystallinity, melting temperature and crystallization temperature of the PVDF/MoS2 nanocomposites were transformed from α-phase to β-phase with the addition of MoS2, MoS2-COOH and MoS2-NH2. During isothermal cold crystallization, the overall crystallization rate of PVDF was slowed with increased MoS2 loading relative to that of neat PVDF. Moreover, the crystallization temperature of the PVDF nanocomposites increased with the addition of MoS2 despite the cooling rate during nonisothermal cold crystallization. DMA tests showed that the storage modulus of PVDF was decreased with the addition of MoS2, while those of PVDF/MoS2-COOH and PVDF/MoS2-NH2 were enhanced to different degrees. The decomposition of the PVDF/MoS2 nanocomposites were also discussed. Relative to neat PVDF, the thermal stability of PVDF was obviously improved with the addition of MoS2, MoS2-COOH and MoS2-NH2, which could be ascribed to the increased degree of crystallinity.

scholarly journals Influence of dopant on the specific features of formation and properties of nanocomposites of poly(3-methylthiophene) with polyvinylidene fluoride

2021 ◽  
pp. 159-174
Author(s):  
Alexander A. Pud ◽  
◽  
Nikolay A. Ogurtsov ◽  
Olga S. Kruglyak ◽  
◽  
...  
Keyword(s):  
Thermal Stability ◽  
Polyvinylidene Fluoride ◽  
Vinylidene Fluoride ◽  
Thermal Studies ◽  
Shell Morphology ◽  
Inhomogeneous Layer ◽  
Transmission Electron ◽  
Oxidant Concentration ◽  
Poly Vinylidene Fluoride ◽  
Thermal Stability Of

The work is devoted to the development and study of conducting nanocomposites of poly(3-methylthiophene) (P3MT) and poly(vinylidene fluoride) (PVDF), suitable for changing properties when interaction with of the environment components, and to find factors of influence on properties of such materials. The kinetic aspects of P3MT formation in the process of 3-methylthiophene (3MT) polymerization in PVDF dispersions in the presence of dopants of different nature, in particular, chloride (Cl-), as well as surface-active dodecylbenzenesulfonate (DBS-) and perfluorooctanoate (PFO-) anions are studied. It is found that DBS- and PFO- anions inhibit 3MT oxidation and decrease P3MT yield in comparison with those of chloride anions. It is shown that P3MT is formed through two consecutive kinetically different reactions of pseudo-first order in terms of the oxidant concentration. Transmission electron microscopy revealed that as a result of such polymerization nanoparticles of doped P3MT formed a surface inhomogeneous layer on PVDF particles, thus forming nanocomposite particles with core-shell morphology. Thermal studies showed higher thermal stability of the doped P3MT phase in the nanocomposite compared to the pure polymer. It is found that thermal stability of the P3MT phase in the PVDF/P3MT-DBS nanocomposites is higher than in the PVDF/P3MT-Cl. The influence of the dopant nature and content of doped P3MT on conductivity and sensitivity of the nanocomposites to vapors of harmful volatile organic compounds (acetone and isopropanol) is characterized. The strongest responses to acetone are shown by the nanocomposite with PFO- dopant. In the DBS- dopant case medium intensity responses are found and the lowest ones are observed for Cl- dopant. It is shown that the sensitivity of nanocomposites extremely depends on the conducting polymer content.

Functionalized poly(vinylidene fluoride) for selective proton-conducting membranes

2021 ◽  
Vol 260 ◽  
pp. 124148
Author(s):  
Rosalin Rath ◽  
Piyush Kumar ◽  
Lakshmi Unnikrishnan ◽  
Smita Mohanty ◽  
Sanjay K. Nayak
Keyword(s):  
Vinylidene Fluoride ◽  
Proton Conducting ◽  
Poly Vinylidene Fluoride ◽  
Conducting Membranes

Effect of accelerated protons on the molecular-topological structure and thermal stability of poly(vinylidene fluoride)

2012 ◽  
Vol 46 (2) ◽  
pp. 84-90 ◽  
Author(s):  
S. R. Allayarov ◽  
Yu. A. Ol’khov ◽  
I. N. Shtefan ◽  
K. I. Muntele ◽  
D. Ila ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Topological Structure ◽  
Vinylidene Fluoride ◽  
Poly Vinylidene Fluoride ◽  
Accelerated Protons ◽  
Thermal Stability Of

Thermal stability of poly(vinylidene fluoride) films pre-annealed at various temperatures

2007 ◽  
Vol 92 (10) ◽  
pp. 1833-1840 ◽  
Author(s):  
Masahiro Inoue ◽  
Yasunori Tada ◽  
Katsuaki Suganuma ◽  
Hiroshi Ishiguro
Keyword(s):  
Thermal Stability ◽  
Vinylidene Fluoride ◽  
Poly Vinylidene Fluoride ◽  
Thermal Stability Of

The state of water and the nature of ion clusters in crosslinked proton conducting membranes of styrene grafted and sulfonated poly(vinylidene fluoride)

2000 ◽  
Vol 10 (12) ◽  
pp. 2678-2684 ◽  
Author(s):  
Matti Elomaa ◽  
Sami Hietala ◽  
Mikael Paronen ◽  
Nadia Walsby ◽  
Kaija Jokela ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
The State ◽  
Proton Conducting ◽  
Ion Clusters ◽  
State Of Water ◽  
Poly Vinylidene Fluoride ◽  
Conducting Membranes ◽  
Sulfonated Poly
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