4th EucheMs chemistry congress

Poster Session 1
s1107
chem. Listy 106, s587–s1425 (2012)
Poster session 1 - organic chemistry
P - 0 4 9 1
eLeCtroCheMiCAL ChArACterizAtion of
Pvdf BASed PoLyMer eLeCtroLyteS for
SeCondAry BAtterieS
e. zeytuni 1 , M. h. uGur 1 , e. CAKMAKCi 1 ,
A. GunGor 1
1 Institute of Science, Chemistry, Istanbul, Turkey
PVDF-based polymer electrolytes have many different uses
according to the intended use. For example; also being used as
electrolyte in rechargeable batteries [1] , they can also be used in
fuel batteries (electrolyte) [2] , besides, they can be used as a binder
for the preparation of cathode material in rechargeable batteries [3] ,
as an electrolyte for supercapacitor applications [4] and as polymer
electrolytes in solar batteries [5] .
The chemical and the thermal stability that the PVDF-based
gel polymers show, make such type of materials attractive for
battery and fuel cell applications. Being among the cheapest
fluoropolymers and having a wide melting point range
(115°C–175°C), PVDF is a processable polymer which also has
properties such as low surface tension.
In this study; the electrochemical stability window of the
membrane has been evaluated with the recyclable voltametry
technique using the 3 (triple) electrode system. All
electrochemical measurements have been performed within glove
box (argon gas cabin). Ac conductivity values of the membranes
containing with Li salts have been found within the range of
10-5 –10-6 S/cm. In this study lithium salts such as LiClO , LiPF 4 6
and LiBF were used by dissolving them in solvents like PC
4
(propylene carbonate), EC (ethylene carbonate), DEC (diethylene
carbonate). The obtained polymer electrolyte membrane has been
characterized in Li (anode)?Polymer electrolyte?LiCoO 2
(cathode) battery assembly.
references:
1. M-K. Song, Y-T. Kim, B. W. Cho, B. N. Popov and
Hee-Woo Rhee,m Thermally Stable Gel Polymer
Electrolytes, Journal of The Electrochemical Society,
Vol. 150, Issue 4, pp. A439–A444, 2003
2. B. Ameduri, From Vinylidene Fluoride (VDF)
to the Applications of VDF-Containing Polymers and
Copolymers, Recent Developments and Future Trends,
Chemical Reviews, 109, 6632–6686, 2009
3. Dong-Min Im, Young-Min Choi, Gue-Sung Kim,
Hyo-Sugtee, Jung-Jong Park,Cathode Active Material for
Lithium Rechargeable Battery and Lithium Rechargeable
Battery Using The Same, United States Patent, US7, 601,
462 B2, 2009
4. Ionic liquid incorporated polymer electrolytes for
supercapacitor application, G. P. Pandey, Y. Kumar,
S. A. Hashmi; Indian Journal of Chemistry, Vol. 49A,
pp. 743–751, 2010
5. YW Chen-Yang *; YT Chen; CC Lia; HC Yu; YC Chuang;
CH Su, YT Lin, Preparation of UV-filter Encapsulated
Mesoporous Silica with High Sunscreen Ability,
Mater. Lett., Vol.65, No.6 p.1060–1062, 2011
Keywords: secondary batteries; gel polymer electrolyte; ionic
conductivity;
4 th EucheMs chemistry congress
P - 0 4 9 2
SyntheSiS of the Side ChAin deuterAted
BrASSinoSteroidS
v. zhABinSKii 1 , y. erMoLoviCh 1 , A. hurSKi 1 ,
o. GuLyAKeviCh 1 , v. KhiPACh 1
1 Institute of Bioorganic Chemistry National Academy of
Sciences of Belarus, Laboratory of Steroids, Minsk, Belarus
Since the discovery of brassinolide in 1979, about 70 related
compounds called as brassinosteroids (BS) have been identified
in plants. Because of a very low content of BS in natural sources,
only few of them have been isolated as individual compounds. In
most cases, their presence in plant sources has been proven by
instrumental methods. The necessary prerequisite for such
investigation is elaboration of appropriate biochemical hypothesis
and the presence of a set of compounds which are expected to be
found. These compounds have to meet some requirements. At
least three deuterium atoms should be present in the molecule to
avoid possible interferences with the peaks [M+1] and [M+2]
belonging to natural 13C and 18O containing species.
The identification procedure implies feeding of plants with
labeled precursors followed by analysis of plant extracts by
instrumental methods (GC/MS or LC/MS). The success of search
is very much influenced by the proper choice of labeled
compounds. The label should be located in a metabolically inert
position and not be subjected to spontaneous isotopic exchange.
In the present work, new results concerning the preparation
of BS and their biosynthetic precursors with three deuterium
atoms in the side chain will de discussed.
Keywords: Brassinosteroids; Labeling; Brassinolide;
Epibrassinolide;
AUGUst 26–30, 2012, PrAGUE, cZEcH rEPUbLIc