scholarly journals Preparation and Characterization of Polymer Composite Materials Based on PLA/TiO2 for Antibacterial Packaging

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1365 ◽  
Author(s):  
Edwin A. Segura González ◽  
Dania Olmos ◽  
Miguel Ángel Lorente ◽  
Itziar Vélaz ◽  
Javier González-Benito
Keyword(s):  
Composite Materials ◽  
Tio2 Nanoparticles ◽  
Polymer Composite ◽  
Bacterial Growth ◽  
Thermal Characterization ◽  
Polymer Composite Materials ◽  
Thermal Transitions ◽  
Scanning Calorimetry ◽  
Particle Content ◽  
Fourier Transformed Infrared Spectroscopy

Polymer composite materials based on polylactic acid (PLA) filled with titanium dioxide (TiO2) nanoparticles were prepared. The aim of this work was to investigate the antibacterial action of TiO2 against a strain of E. Coli (DH5α) to obtain information on their potential uses in food and agro-alimentary industry. PLA/TiO2 systems were prepared by a two-step process: Solvent casting followed by a hot-pressing step. Characterization was done as a function of particle size (21 nm and < 100 nm) and particle content (0%, 1%, 5%, 10%, and 20%, wt %). Structural characterization carried out by X-ray diffraction (XRD) and Fourier Transformed Infrared spectroscopy (FTIR) did not reveal significant changes in polymer structure due to the presence of TiO2 nanoparticles. Thermal characterization indicated that thermal transitions, measured by differential scanning calorimetry (DSC), did not vary, irrespective of size or content, whereas thermogravimetric analysis (TGA) revealed a slight increase in the temperature of degradation with particle content. Bacterial growth and biofilm formation on the surface of the composites against DH5α Escherichia Coli was studied. Results suggested that the presence of TiO2 nanoparticles decreases the amount of extracellular polymeric substance (EPS) and limits bacterial growth. The inhibition distances estimated with the Kirby-Bauer were doubled when 1% TiO2 nanoparticles were introduced in PLA, though no significant differences were obtained for higher contents in TiO2 NPs.

scholarly journals The Influence of Inorganic Fillers on the Protective Properties of Epoxy Polymer Composite Materials

2018 ◽  
Vol 7 (4.3) ◽  
pp. 279 ◽  
Author(s):  
Yuliya Danchenko ◽  
Vladimir Andronov ◽  
Tatyana Obizhenko ◽  
Anatoliy Kosse ◽  
Igor Khmyrov
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Epoxy Polymer ◽  
Polymer Composite Materials ◽  
Scanning Calorimetry ◽  
Protective Properties ◽  
Polymeric Compositions ◽  
Inorganic Fillers ◽  
Dsc Method ◽  
Amine Curing

The influence of regularities of the chemical-mineralogical nature, the dispersity, and the surface properties of inorganic fillers on the protective properties of epoxy polymer composite materials have been investigated. Polymeric compositions based on epoxy resin of ED-20 brand and aliphatic amine curing agent of diethylenetriamine of DETA brand have been chosen as the research materials. The fillers were the air-dry dispersed materials of different nature: oxide, clay and quartz. The resistance of the composites to water and aqueous solutions (absorbency) was investigated by dipping the samples into an aggressive aqueous medium. For the received samples of the filled composites, thermogravimetric (TG) and differential scanning calorimetry (DSC) method were used using the SDT Q600 device manufactured by TA Instruments (USA). It has been found that the thermal stability and the absorbing capacity of the filled composites in water and aqueous acidic and alkaline mediums correlate with each other. It has been shown that to obtain materials with improved protective characteristics, it is necessary to use oxide or clay fillers with the basic (alkaline) surface function.  

scholarly journals Dielectric Properties of Nanocomposites based on Epoxy Resins and Titanium Dioxide

2021 ◽  
Vol 15 ◽  
pp. 1400-1406
Author(s):  
A. G. Getmanov ◽  
Tran Quyet Thang
Keyword(s):  
Titanium Dioxide ◽  
Composite Materials ◽  
Dielectric Properties ◽  
Tio2 Nanoparticles ◽  
Polymer Composite ◽  
Epoxy Resins ◽  
Epoxy Polymer ◽  
Polymer Composite Materials ◽  
Relaxation Processes

In this work, polymer composite materials based on nanoparticles of titanium dioxide and epoxy polymer have been obtained. The dielectric properties of the obtained composite are investigated. Studies have shown that the introduction of TiO2 nanoparticles into an epoxy polymer leads not only to a slowdown in relaxation processes, but also increases the value of the through conduction. It was shown that the greatest influence of the introduction of nanoparticles on relaxation processes is observed on the α-relaxation

FSUE "VIAM" solvent-free binders for polymer composite materials

2016 ◽  
Vol 2 (2) ◽  
pp. 37-42 ◽  
Author(s):  
E. N. Kablov ◽  
L. V. Chursova ◽  
A. N. Babin ◽  
R. R. Mukhametov ◽  
N. N. Panina
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Solvent Free ◽  
Polymer Composite Materials

Aging of polymer composite materials under loading. (See Beginning in #10-2020)

2020 ◽  
pp. 2-12
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Cyclic Loads ◽  
Reinforced Plastics ◽  
Water Exposure ◽  
Laboratory Conditions ◽  
Bending Loads ◽  
Moisture Conditions

A study review of aging polymer composite materials (PCM) under different heat-moisture conditions or water exposure with the sequential or parallel influence of static or cyclic loads in laboratory conditions is presented. The influence of tension and bending loads is compared. Conditions of the different load influence on parameters of carbon-reinforced plastics and glass-reinforced plastics are discussed. Equipment and units for climatic tests of PCM under loading are described. Simulation examples of indices of mechanical properties of PCM under the influence of environment and loads are shown.

Aging of polymer composite materials under loading

2020 ◽  
pp. 7-18
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Cyclic Loads ◽  
Reinforced Plastics ◽  
Water Exposure ◽  
Laboratory Conditions ◽  
Bending Loads ◽  
Moisture Conditions

A study review of aging polymer composite materials (PCM) under different heat-moisture conditions or water exposure with the sequential or parallel influence of static or cyclic loads in laboratory conditions is presented. The influence of tension and bending loads is compared. Conditions of the different load influence on parameters of carbon-reinforced plastics and glass-reinforced plastics are discussed. Equipment and units for climatic tests of PCM under loading are described. Simulation examples of indices of mechanical properties of PCM under the influence of environment and loads are shown.

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