Polymer Composite
S. Manjunatha
Abstract
Nano-sized inorganic oxide materials dispersed polymers constitute a special class of composite materials that improve the properties of the base polymer. The way of designing the composite materials by fine dispersion of inorganic nanofillers in polymers leads to special properties and applications. ...
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Nano-sized inorganic oxide materials dispersed polymers constitute a special class of composite materials that improve the properties of the base polymer. The way of designing the composite materials by fine dispersion of inorganic nanofillers in polymers leads to special properties and applications. Metal oxide-based polymer nanocomposite materials integrate the science and technology of materials in terms of enhanced properties in comparison with basic materials. A bimetallic oxide material like nanosized cobalt nickelate (CoNiO2) is considered as an inorganic filler in polyaniline for its composite material. CoNiO2 was synthesized by microwave-assisted route using polyvinyl alcohol (PVA) as a fuel. The in-situ chemical oxidation polymerization method was adopted for the synthesis of nanosized cobalt nickelate dispersed polyaniline nanocomposite (PANI/CoNiO2) sample. Structural characterization of the derived nanocomposite sample was studied by employing X- ray diffraction (XRD) tool and morphology by Scanning Electron Micrograph (SEM) tool respectively. Fourier transform-Infrared (FT-IR) instrumentation is used to know the bonding nature of the sample. The presence of metal oxygen confirms the sample. Absorption behavior was analyzed by UV-vis study. The presence of metal components is confirmed by EDX analysis. The thermal behavior of the prepared polymer composite sample was carried out to know its thermal behavior.
Polymer Composite
Gabriela Herrera Rodriguez; Andya J Ramírez Irigoyen; Karla F García Verdugo; Ana V Torres Figueroa; Brianda M Salazar Salas; José C Encinas Encinas; Cinthia Jhovanna Perez Martinez; Teresa del Castillo-Castro
Abstract
The development of conjugated polymer- and carbonaceous-based platforms as NIR photothermal materials is a valuable contribution to modern-day cancer therapies. Measurements of the thermal response of these materials under same NIR irradiation conditions allows accurately comparing their photothermal ...
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The development of conjugated polymer- and carbonaceous-based platforms as NIR photothermal materials is a valuable contribution to modern-day cancer therapies. Measurements of the thermal response of these materials under same NIR irradiation conditions allows accurately comparing their photothermal capacities to accomplish specific biomedical requirements. In this work, polydopamine (PDA) and polypyrrole (PPy) nanoparticles were synthesized by green-based methods and their photothermal behavior, compared to that of acid-treated carbon nanotubes (CNT), was studied under the same experimental setup. Furthermore, PDA, PPy, and CNT nanostructures were embedded within a crosslinked poly(N-isopropylacrylamide-co-acrylic acid) (P(NIPAM-co-AA)) matrix, and the photothermal properties of these novel nanocomposite hydrogels were also comparatively studied. Experimental conditions such as the filler concentration, irradiation time, and laser power, as well as the nanocomposite hydrogel composition can be tuned to yield mild (39–43 °C) or high (47-50 °C) hyperthermia conditions, as required. The photothermal results of P(NIPAM-co-AA) nanocomposite hydrogels containing PDA, PPy, or CNT nanostructures evidenced the potential of these materials in controlled drug delivery and for combined chemo-photothermal therapies of tumors by NIR laser irradiation.
Polymer Composite
Daily Maria Gallegos; Denis Mayta; Gerhard Paúl Rodriguez; Fredy Alberto Huaman; Fernando Alonso Cuzziramos
Abstract
The effect of the addition of alpaca fibers on the mechanical response of geopolymeric mortars was studied using uniaxial compression tests. The studied mortars were manufactured by mixing mining tailings, fine sand and variable percentages of alpaca wool fibers. The mechanical results show a higher ...
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The effect of the addition of alpaca fibers on the mechanical response of geopolymeric mortars was studied using uniaxial compression tests. The studied mortars were manufactured by mixing mining tailings, fine sand and variable percentages of alpaca wool fibers. The mechanical results show a higher degree of deformation, up to 6%, for the mortar mixtures with higher amounts of wool fiber in their composition, that is, the decrease in maximum compressive strength was demonstrated as the volume increased of added fibers, the values were from 32 to 9 MPa for samples with 0 and 8 % Vol. of added fibers, respectively. On the other hand, studies of the real density and the average porosity were carried out, obtaining values of 2.59 g/cm3 and 31 %, respectively. Additionally, the morphological analysis was carried out using microscopy in which a continuous binder geopolymer phase could be seen and within this phase a phase of sand and fibers.
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