Photonic crystals in biology

Poster Session, Tuesday, June 15
Theme A1 - B702
Phos phine oxi de bas ed polyurethane / silica nanocompos ites via nonisocyanate route
1,2 1 , Nilhan Kayaman-Apohan 1 *,
3 , Atilla Güngör 1
1 Marmara University, Department of Chemistry, 34722 Göztepe-Istanbul/ Turkey
2 Trakya University, Department of Chemistry, Edirne/ Turkey
3 -Istanbul/ Turkey
Abstract-The main objective of this work is to develop environmentally friendly and flame-resistant polyurethane-silica nanocomposite coatings.
For t his purpose, a novel carbonate modified bis (4-glycidyloxy phenyl) phenyl phosphine oxide (CBGPPO) was synthesized to prepare
nanocomposites via nonisocyanate route. The cupping, impact and gloss measurements were performed on aluminum panels, and the tensile test,
gel content, thermal and morphological analyses were conducted on the free films.
Applications of polyurethane (PU) materials have
significantly increased in comparison with some other
thermosetting polymer materials. Conventional polyurethanes
have good mechanical properties but they are porous and
possess poor hydrolytic stability and insufficient permeability.
The involvement of toxic components, such as isocyanates, in
their fabrication process makes the production extremely toxic
and dangerous. In this sense, a pioneering method, which
depends on the reaction between cyclocarbonate oligomers
and primary amine oligomers, has been developed for
environmental-friendly PU manufacturing. Cyclocarbonates
that can be synthesized from corresponding epoxy precursors
are attracting research interest due to their potential use in the
preparation of green, porous free and moisture insensitive
polyurethanes.[1,2]
A feasible approach for improving flame retardation of
polyurethanes involves the synthesis of phosphorus containing
polyurethanes. Since traditional halogen-based flameretardants
have disadvantages such as the potentiality of
corroding metal components and toxic corrosive fumes of
hydrogen halide during the combustion, halogen-free flameretardants
for polymers have attracted more attention from
scientists in recent years.[3,4]
Therefore, eight different formulations of nanocomposites
were prepared to investigate the effects of silica and phosphine
oxide based cyclocarbonate oligomer on the coating
properties.
Table 1. Formulation ratios of naocomposites
KOD
SOL-
JEL
%
CPPG
(g)
1
2
3
4
5
6
7
8
CBGPPO
(g)
HMDA
(g)
CPPG(100)-
CBGPPO(0)-Si(0) 0 8 - 1.534
CPPG(75)-
CBGPPO(25)-Si(0) 0 6 2 1.663
CPPG(50)-
CBGPPO(50)-Si(0) 0 4 4 1.86
CPPG(100)-
CBGPPO(0)-Si(20) 20 8 - 1.63
CPPG(75)-
CBGPPO(25)-Si(20) 20 6 2 1.76
CPPG(50)-
CBGPPO(50)-Si(20) 20 4 4 1.96
CPPG(75)-
CBGPPO(25)-Si(10) 10 6 2 1.71
CPPG(75)-
CBGPPO(25)-Si(5) 5 6 2 1.687
impact, cupping, gel content and stress-strain tests. Thermal
behaviors and morphologic properties of the coatings were
also investigated. Incorporation of silica and CBGPPO into
formulations increased modulus and hardness of the coatings.
It was also observed that, the thermal stability of hybrid
coatings enhanced with the addition of silica and CBGPPO.
O
O
CH 2
-CH-CH 2 O P O CH 2
-CH-CH 2
O
CH 2
-CH-CH 2 O P O CH 2
-CH-CH 2
O
O
O
Figure 1. Synthesis reaction of CBGPPO
1500 psi CO 2
TBAB
80 C
2 saat
This work was supported by TUBITAK (The
Scientific&Technological Research Council of Turkey)
Research Project under grant Project Number: 106T083.
*Corresponding author: 6Tnapohan@marmara.edu.tr
[1] Türünç, O., Kayaman-Apohan, N., Kahraman, M.V.,
Men Gungor, A., 2008, J Sol-Gel
Sci Techno l, 47, 290-299.
[2] Figovsky, O.L.; Shapovalov, 2002, L. M acrool Symp, 187, 325-
332.
[3] Kahraman, M.V.; Kayaman-Apohan, N.; Arsu, N.; Güngör, A.,
2004, Progress in Organic Coatings, 51, 213-219.
[4] Karatas,S.; Hosgor,Z.; Menceloglu,Y.; Kayaman-Apohan,N.;
Gungor,A., 2006, J.Appl. Polym. Sci., 102, 1906-1914.
O
O
O
O
Nanocomposite coatings were prepared by curing these
formulations with diamine thermally and their characterization
was performed by analyses of various properties such as
6th Nanoscience and Nanotechnology Conference, zmir, 2010 270