Dielectric Behavior of SBS/Polyaniline Thermally Processable Blends

et al. 2021

Geopolymers are materials composed of aluminosilicates, which upon activation by the alkaline solution, form repeating units, being classified as inorganic polymers. Geopolymers have gained prominence due to obtaining the raw material that can be natural or residual, the ease of production, and cost-effective. These materials are widely used in civil construction for the replacement of Portland cement and also in the environmental area for the remediation of toxic compounds. However, there is a lack in the literature about the applications of these materials. Thus, this work deals with geopolymers for the sorption of hydrogen sulfide gas.

Section: Introductionmentioning

confidence: 99%

Geopolymer Microparticles as Up‐and‐Coming H₂S Sorbers

Maranhão¹,

Almeida²,

et al. 2021

“…[ 28–33 ] Among the last three, polymers are vital materials for the Humankind and have been widely researched by Biopolymers and Sensors Lab Group from UFRJ. [ 34–145 ]…”

Section: Introductionmentioning

confidence: 99%

Novel Core‐Shell System Based on Gelatin and Hydrophilic Polymers Useful as Concrete Self‐healing Systems

Costa

Sousa

et al. 2021

Concrete structures repair results in substantial economic and environmental issues. So, new technologies able to increase concrete lifetime are being developed. Among them, the self-healing mechanisms, which can be improved by using polymers. Thus, three different materials are synthesized to act as self-healing systems. They are: (I) cross-linked gelatin mixed with CaCO 3 (the self-healing agent); (II) a core-shell system based on the material I layered by poly(hydroxypropyl methacrylate); and (III) a second core-shell structure based on the material I covered with poly(vinyl alcohol). Cross-linking and grafting are performed using glutaraldehyde. Fourier-transform infrared spectroscopy (FTIR) proves the structure obtaining. Thermogravimetric analysis and differential scanning calorimetry prove that the materials show thermal properties that allow their use in concrete applications. Swelling degree shows that all materials swell when in contact with water. Granulometry shows the materials are mostly in the millimeter scale. Last, an aqueous media release test shows that the three tested systems did not liberate significant amounts of CaCO 3 . Therefore, both the gelatin and gelatin + polymer systems can protect the healing material, avoiding the release of the self-healing agent before the concrete cracking takes place.

“…Polymers are vital materials for the Humankind and have been widely researched by Biopolymers and Sensors Lab Group from UFRJ. [ 2–115 ] Based on this background, our group can state that an alternative to mitigate this impact is research and biopolymers. [ 76 ] One of the preferred routes for producing these biomaterials is by applying specific bacteria that can accumulate energy in biopolymers.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo Assisted FTIR Spectroscopy: A Python Tool for the Determination of the Constituents in Blended Biopolymer Samples

Cunha

Pereira

et al. 2021

A massive number of biopolymers and complex polymer blends are being developed every day. One of the significant challenges related to these materials is their characterization. In more specific terms, estimating the composition of polymeric mixtures is a substantial challenge for the technologist, who must understand the nuances of the material's composition for its proper application. Thus, this work develops a Python code capable of handling the composition analysis using the FTIR spectra of some biopolymers found in the literature. Through the Monte Carlo method associated with the Mixture Rule, these spectra are combined, generating a myriad of signals referring to different compositions. These signals are compared with the one from the FTIR spectrum of the mixture, allowing the root-mean-square error (RMSE) calculation. Finally, minimizing the RMSE value leads to the final composition of the material, which is presented and saved in a text file.