Structure and properties of poly(ethylene-co-chlorotrifluoroethylene) and polyvinylidene fluoride exposed to water, hydrochloric acid, hydrobromic acid and tetrachloroethylene

2004 ◽  
Vol 44 (1) ◽  
pp. 113-122 ◽  
Author(s):  
M. S. Hedenqvist ◽  
J. E. Ritums ◽  
M. Condé-Brana ◽  
G. Bergman
Keyword(s):  
Hydrochloric Acid ◽  
Hydrobromic Acid ◽  
Polyvinylidene Fluoride ◽  
Structure And Properties ◽  
Poly Ethylene

scholarly journals The influences of polydopamine immersion time on characteristics and performance of polyvinylidene fluoride ultrafiltration membrane

2018 ◽  
Vol 197 ◽  
pp. 09007
Author(s):  
Syawaliah Syawaliah ◽  
Nasrul Arahman ◽  
Medyan Riza ◽  
Sri Mulyati
Keyword(s):  
Polyvinylidene Fluoride ◽  
Water Flux ◽  
Sem Analysis ◽  
Inversion Method ◽  
Asymmetric Structure ◽  
Pvdf Membrane ◽  
Before And After ◽  
Poly Ethylene ◽  
And Performance ◽  
Phase Inversion Method

The Polyvinylidene Fluoride (PVDF) membrane has been prepared by phase inversion method using N,N-dimethylacetamide (DMAc) as solvent and Poly Ethylene Glycol (PEG) as additive. The fabricated membrane was modified by Polydopamine (PDA) coating in concentration of 0.5 mg/ml and immersion times of 2 hours, 6 hours, and 24 hours. The characteristics and performance of the PVDF membranes before and after the modification are studied in this paper. The result of the water flux experiment showed that the PDA-coated PVDF membranes showcased a higher flux than that of pure PVDF membrane. Scanning Electron Microscopy (SEM) analysis confirmed that the membrane had an asymmetric structure consisting of two layers. There was no significant influence on the addition of PDA to the morphology of the pore matrix because the modification was done by surface coating. Fourier Transform Infrared Spectroscopy (FTIR) analysis showed that PDA was successfully introduced on the surface of PVDF membrane with the appearance of O-H from cathecol and N-H peaks at wavenumber range of 3300-3600 cm-1. Modification with PDA increased the mechanical strength of the membrane which affirmed by the results of the tensile and elongation at break evaluation.

Structure and Properties of Urea-Crosslinked Star Poly[(ethylene oxide)-ran-(propylene oxide)] Hydrogels

2008 ◽  
Vol 8 (10) ◽  
pp. 923-931 ◽  
Author(s):  
Paul D. Dalton ◽  
Carolin Hostert ◽  
Krystyna Albrecht ◽  
Martin Moeller ◽  
Juergen Groll
Keyword(s):  
Ethylene Oxide ◽  
Propylene Oxide ◽  
Structure And Properties ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Effects of post-treatment on the structure and properties of PVDF/FEP blend hollow fiber membranes

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 77407-77416 ◽  
Author(s):  
Qing-lin Huang ◽  
Yan-jie Wu ◽  
Chang-fa Xiao ◽  
Kai-kai Chen ◽  
Liang Song ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Polyvinylidene Fluoride ◽  
Melt Spinning ◽  
Post Treatment ◽  
Structure And Properties ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes

Polyvinylidene fluoride (PVDF)/poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) blend hollow fiber membranes were prepared by the melt-spinning method.

Structure and Properties of Blends of Polycarbonate and Poly(Ethylene-Terephthalate-Co-p-Hydroxybenzoate): Phase Diagram and Mechanical Behavior

1989 ◽  
Vol 171 ◽  
Author(s):  
Robert Kosfeld ◽  
Frank Schubert ◽  
Michael Hess ◽  
Witold Brostow
Keyword(s):  
Phase Diagram ◽  
Liquid Crystal ◽  
Thermal Behavior ◽  
Polymer Blends ◽  
Ethylene Terephthalate ◽  
Structure And Properties ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Equilibrium Phases ◽  
Polymer Liquid Crystal

ABSTRACTThe investigation of the thermal behavior of polymer blends leads to phase diagrams which involve Important information about the system. From these diagrams, equilibrium as well as non-equilibrium phases can be deduced and ranges of miscibility or partial miscibility of the polymers become obvious. Hence the diagrams are of a great value for processing of advanced polymer blends, especially If a polyphasic polymers such as a polymer liquid crystal is one of the constituents of the system.

ChemInform Abstract: Selective Si-Si Bond Cleavage of Decaisopropylbicyclo[2.2.0]hexasilane with Hydrobromic Acid and Hydrochloric Acid.

ChemInform ◽  
2010 ◽  
Vol 33 (19) ◽  
pp. no-no
Author(s):  
Akira Meguro ◽  
Haruaki Sakurai ◽  
Kei Kato ◽  
Soichiro Kyushin ◽  
Hideyuki Matsumoto
Keyword(s):  
Hydrochloric Acid ◽  
Hydrobromic Acid ◽  
Bond Cleavage

The influence of polymerization temperature on structure and properties of polyaniline

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Faris Yılmaz ◽  
Zuhal Küçükyavuz
Keyword(s):  
Thermal Analysis ◽  
Electrical Conductivity ◽  
Molecular Weight ◽  
Hydrochloric Acid ◽  
Liquid Medium ◽  
Thermal Studies ◽  
Ammonium Persulfate ◽  
Morphological Properties ◽  
Polymerization Temperature ◽  
Structure And Properties

AbstractThe influence of polymerization temperature (from -25 to +25 oC) on molecular weight, crystallinity, electrical conductivity, thermal and morphological properties of polyaniline has been investigated. Aniline was oxidized in an aqueous medium with ammonium persulfate and 1.0 M hydrochloric acid. The reaction mixture freezes below -10 oC and hence lithium chloride was used in sufficient amount to prevent freezing. As the reaction temperature decreases, both the molecular weight of polyaniline and its crystallinity increase. Thermal studies show a common three step decomposition pattern irrespective of the temperature used during synthesis. The morphology of polyaniline changes from granular (reaction in liquid medium) to tubular (polymerization in the frozen state). Thermal analysis indicated that the polyaniline stability increased with decreasing synthesis temperatures. Electrical conductivity of polyaniline was found to be independent of the polymerization temperature and, consequently, of the molecular weight.

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