Properties of nanocomposites substantially improved:

1
Romanian Academy of Science Institute of Physical
Chemistry Ilie Murgulescu Spl. Independentei
202, 060021 Bucharest,
A Nano- Composite Polyethylene glycol-epoxy as
Building Element
M.Constantinescu1,E.M.Anghel1, M.Olteanu1,
A.Stoica1, L.Dumitrache2, M.Ladaniuc2,
D.Constantinescu3, C.Perianu Marin3 1 Institute
of Physical Chemistry of Rumanian AcademyIlie
Murgulescu , Bucharest , 2ICECHIM Bucharest, 3
INCERC Bucharest . mariella_const_at_yahoo.com
Objectives and importance of this research
Nano composites preparation
Material characterization and testing
Heat storage hanging materials for heating and
cooling of buildings, reducing the conventional
energy consumption with a direct impact on CO2
emissions, becomes an attractive alternative.
The goal of this study was to find the
physico-chemical fundamentals of realization of
nanocomposites PEG-epoxy as building materials
with different geometries and destinations.
Unpolarized Raman spectra of the PEG1500-epoxy
30 epoxy resin Ropoxid 501 70 PEG 1500 Al
powder melted and mixed with TETA or I 3361
hardener

PEG
The advantages of phase change materials A
constant temperature domain for the phase
transformation, chosen for each
application. High storage density 70-100 kWh/m3
c) Lorenzian deconvolution of the spectrum
within 1400-3100 cm-1
(b) Lorenzian deconvoluted Raman spectrum within
160-1400 cm-1
(a) raw spectrum
hardener
An epoxy- polyethylene glycol 1500 was obtained
and characterized This nano composite material
obtained as cross-linked three dimensional
structure is attractive for heating and cooling
of buildings, reducing space and costs for
containerization. Presents good mechanical
stability, is homogeneous as can be seen from the
SEM measurements
Results of the fitting procdure, assignments and
literature data of the PEG 1500-epoxy (488 nm
laser, room temperature)

• Properties of nanocomposites substantially
  improved
• Mechanical properties Strength modulus and
  dimensional stability
• Thermal stability , flame retardancy and reduced
  smoke emissions
• Decreased permeability to gases, water and
  hydrocarbons

PEG
Thermo-physical properties of PEG-epoxi
nanocomposite
Hardening reaction of epoxi resin with PCM
Tridimensional epoxi with PCM
epoxy
Kinetics of hardening reaction for the studied
systems in isotherm regime
from DSC experiments.
PEG1500

where Tf is the phase change temperature,
specific heat a was calculated from thermal
conductivity thermal diffusivity and density
were measured in standard conditions. The maximum
error for dimensional variation was 1.5 even
after PEG was melted.
DSC for PEG 1500-epoxyAl
Maximum PCM in an epoxi matrix
Ropoxid 501I 3361 , 0 PCM - Ropoxid 501I 3361
PCM had no influence on the kinetics of the
hardening process
Green data are for PEG
CONCLUSIONS 1. The nanocomposite material to be
used as building element was obtained by using
melted (PEG1500 0.1 wtAl powder, added for
enhancing the thermal conductivity of the
material ) 70 wt incorporated in an epoxidic
resin 30 wt. The Epoxidic resin used was Ropoxid
501 (Policolor), with a hardener
threeethylentetramine (TETA) or I 3361
(Policolor). The system hardened at the ambient
temperature in 24h and the total reaction was
ended after 7 days. 2. From Raman spectra and
from the kinetics of hardening reaction can be
concluded that epoxy resin is completed cured (
Raman bands of the PEG 1500 1275 and 1437 cm-1
are very closed to the epoxide modes 1264 and
1442 cm-1 and the epoxide CH2 stretch at about
3012 cm-1 is absent ) 3. Epoxy resin induces a
10-20 cm-1 deviation toward lower wavenumber of
the Raman modes of the polyoxyethylenoglycols
1500 matrix, indicating some interactions at
nanoscale. 4. The material presents good
mechanical, thermal and chemical properties
suitable for building materials. 5. It can be
used in different geometries, in active or pasive
systems, depending on the chosen application. 6.
Energy storage in building materials will reduce
the conventional energy consumptions, will
increase the living comfort, decreasing the CO2
emissions.
Thermal conductivity in stationary regime
SEM micrographs for polyethylene glycol (PEG)
1500-epoxy