Abstracts Book - IMRC 2018

• SF7-P011
EVALUATION OF THE SHAPE MEMORY EFFECT IN A COMPOSITE
MATERIAL FROM PMMA AND METAL 0D NANOPARTICLES OF Ag.
Benjamin Portillo Rodriguez 1,2
1 Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM (CCIQS), Material
Chemistry, Mexico. 2 Universidad Autónoma del Estado de Morelos, Chemistry, Mexico.
The shape memory polymers (SMPs) are those capable of remembering their
original form, returning to it even after they have been deformed, due to the
action of an external stimulus (temperature, electricity, pressure, solvents, light
and others). The stimulus selected in this work was the temperature, which has
been reported that for SMPs its mechanism of action depends to a great extent
on a glass transition temperature (T g ), where this T g can be modified with the
addition of metallic nanoparticles. Therefore, our work was based on the
assumption that adding silver nanoparticles (AgNp) in the polymer (PMMA) and
modifying its thermal properties influence directly the shape memory effect
(SME). It was reported that the added amount of AgNp in the polymer directly
changed the T g , so it was decided to use an in situ addition method, suspension
polymerization, which uses the interface formed between two insoluble media
to induce the deposition of AgNp on the surface of polymer and together with
an adequate stirring rate to obtain small polymer spheres and achieve the
lowest repulsion energy between the AgNp and the polymer to achieve
maximum AgNp addition. This method was successful as seen with EDS analysis,
in which the percentages of silver could reach up to 60 % w, this percentages
varied directly with the stirring rate, however, thermal analysis showed that the
increase in AgNp, increased the T g , this was explained because AgNp dissipated
heat instead of being transmitted in the polymer. Further our testing showed
that the amount of AgNps did not had a clear effect on SME since some tests
were the amount of Ag was only 0.3 %w had the highest SME as well as a
decrease in the T g value, hence, the primary property affecting SME is the
interaction between AgNps and polymer chains.
Keywords: Shape Memory, Nanoparticles, PMMA
Presenting authors email: bportillor158@alumno.uaemex.mx