Thermomechanical properties of silica-polyacrylic nanocomposites
- PDF / 285,539 Bytes
- 6 Pages / 432 x 648 pts Page_size
- 76 Downloads / 201 Views
Thermomechanical properties of silica-polyacrylic nanocomposites Adán Fuentes-Miranda1,2*, Bernardo Campillo-Illanes1,2, Marta Fernández-Garcia3 and Daniel López-García3 1 Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca, Mor. 62210, MEXICO. 2 Departamento de Ingeniería Química Metalúrgica, Facultad de Química, Universidad Nacional Autónoma de México, CDMX. 04510, MEXICO. 3 Ingeniería Macromolecular, Instituto de Ciencia y Tecnología de Polímeros, Madrid, 28006, ESPAÑA. *To whom correspondence should be addressed: [email protected]
ABSTRACT The synthesis of inorganic/organic nanocomposite systems, well known as hybrid materials, represents a new class of polymeric materials, which combine properties of inorganic particles, such as barrier, optical, catalytic and conductive properties, among others, with flexibility and transparency of the organic polymer matrix, being easily processable. They could be applied in a diversity of areas such as textiles, inks, adhesion, biomaterials, paints, adhesives, and electronics [1-2]. Within the inorganic materials, silica nanoparticles which present excellent properties, such as high mechanical strength, thermal and chemical stability, and high surface area, have been widely incorporated into a polymer matrix to prepare polymer/silica hybrid materials [3-4]. It is reported that the quantity and the dispersion of nano-SiO 2 in the polymer matrix have a real effect on the properties of the final materials [5-6]. In this work, hybrid silica/poly(butyl acrylate-methyl methacrylate-acrylic acid) (SiO 2 /P(BA-MMA-AA)) were synthesized via in situ semi-batch emulsion polymerization. The results showed that this process was produced with high monomer conversion and low formation of agglomerates. The thermomechanical behavior of the films obtained from latexes was characterized by using thermogravimetric analysis, differential scanning calorimetry, and tensile test. The nanocomposite films displays significantly improved mechanical and thermal properties over its pure polymer film, and also presents almost the same high transparency. INTRODUCTION The recent efforts to obtain materials with high strength have focused on the use of nanotechnology. In coatings research, nanotechnology plays an important role, which focuses on the use of nanoscale particles, in the search for greater surface area to promote more interaction with the surrounding polymer matrix, thus contributing to the increase of properties of the hybrid polymer materials. These nanocomposites are constructed by dispersing nanofiller material into a polymeric matrix. There are three common methods to produce polymer nanocomposites: melt compounding, in situ polymerization, and the solvent method. Different types of nanofillers are currently utilized, e.g. nanoclays, carbon nanotubes, and hybrid organic–inorganic nanoparticles such as polyhedral silsesquioxane (POSS). The effect of the fillers on the composites properties depends on their concentration, the shape and particle size, aggr
Data Loading...
