4th EucheMs chemistry congress

Poster Session 1
s1072
chem. Listy 106, s587–s1425 (2012)
Poster session 1 - organic chemistry
P - 0 4 2 1
3-PyrAnone dioxACorroLe - An
extrAordinAry trAnSforMAtion
of 21,23-dioxAPorPhyrin
M. PAwLiCKi 1 , d. ByKowSKi 1 , L. SzterenBerG 1 ,
L. LAtoS GrAzynSKi 1
1 University of Wroclaw, Chemistry, Wroclaw, Poland
A ubiquitous nature of furan places this heterocycle in a row
of significant players involved in several widely explored aspects
of current research in the organic chemistry, starting from the total
synthesis of natural products ending on formation of extended
π-systems responsible for an optoelectronic behaviour. Within
these paths a reactivity of furan stays in the central point of
investigation as that heterocycle takes a crucial role in the
formation of other systems (oxidative reactions) but also a
cycloaddition observed on a post-synthetic level and widely used
in the total synthesis. Similarly, the reactivity observed with a
support of Al O is an example of derivatization on a surface of
2 3
the solid used in the wide range of environment concerning
reactions.
While comparing the modifiability of furan, a transformation
of such heterocycle with subtly changed electronic structure i.e. as
an integral part of oxaporphyrin(s) stays in opposite side of
mentioned rules as this building block remains unreactive in such
systems as the demands of macrocycle take control over the
subunit independence. Nevertheless an application of alumina to
dioxaporphyrin led to an extraordinary transformations observed
for the first time in the porphyrin-like skeleton. Here we present
an unprecedented example of the Achmatowicz reaction observed
for 21,23-dioxaporphyrin giving a 3-pyranone dioxacorrole
skeleton. The new macrocycle presents features characteristic for
a non aromatic molecule, and formally is a product of addition of
a water molecule followed by a sequence of transformation leading
to formation of presented molecule. The coordination of
palladium(II) forces the formation of an unstable tautomer
obtained by a creation of a palladium(II)-carbon bond within the
coordination cavity. Characteristic features observed for the
macrocycle and its behaviour will be discussed based on the
spectroscopic premises (NMR, UV-Vis) along with a single
crystal analysis.
Keywords: Macrocycles; Oxidation; Porphyrinoids;
4 th EucheMs chemistry congress
P - 0 4 2 2
fABriCAtion And ChArACterizAtion of
LLdPe-Modified nAnoSiLiCA/LdPe/LLdPe fiLM:
MiCrowAvABLe PACKAGinG APPLiCAtion
C. PeChyen 1 , S. thAnAKKASArAnee 1 , t. JinKArn 1
1 Kasetsart University, Packaging and Materials Technology,
Bangkok, Thailand
LDPE and LLDPE are popular applied in the flexible food
packaging. Because there are strong, tough, clear, good moisture
barrier and can be sealed with heat. However, they are poor gas
barrier or moisture resistances are not enough to be able to
preserve food. Therefore, the concept of this work was used the
nanosilica applied in preparing LLDPE/nanosilica as a outer layer
film for LLDPE reinforced nanosilica/LDPE/LLDPE multilayer
film for microwavable packaging materials in future work.
Therefore, the objective of this work was to study the optimal
conditions for preparing linear low density polyethylene film
reinforced with uncoated and coated nanosilica and LLDPE
reinforced nanosilica/LDPE/LLDPE multilayer film on
mechanical properties, Thermal properties, barrier properties and
physical properties. The experiment of this work was divided into
4 main steps. First, coating nanosilica with vinyltriethoxysilane
by internal mixer. Preparation of linear low density polyethylene
film reinforced with uncoated and coated nanosilica which
different silica quantities are 1, 3, and 5 phr by blown film
extruder. Preparation of LLDPE/nanosilica as a outer layer film
for LLDPE reinforced nanosilica/LDPE/LLDPE multilayer film
And then the surface morphology of film was examined by SEM
and contact angle of film was measure by optical contact angle
measurement systems. The properties of the film were analyzed;
oxygen permeability by OTR and water vapor permeability by
WVTR. Tensile properties of film were examined by universal
testing machine and thermal properties of film was characterized
by TGA. Results indicated that addition at 1 phr of treated
nanosilica into LLDPE matrix (LLDPE-nano-SiO 1 phr)
2
presented the highest tensile strength, modulus and elongation of
these films. LLDPE treated nano-SiO /LDPE/LLDPE multilayer
2
film presented the lowest of water vapor permeability but
presented the highest of oxygen permeability. However, LLDPE
treated nano-SiO /LDPE/LLDPE multilayer film presented the
2
highest of degradation temperature.
Keywords: LLDPE film; Nanosilica; Vinyltriethoxysilane;
Barrier properties; Mechanical properties;
AUGUst 26–30, 2012, PrAGUE, cZEcH rEPUbLIc