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Chemical Synthesis of Atactic Poly-3-hydroxybutyrate (a-P3HB) by Self-Polycondensation: Catalyst Screening and Characterization.
Polymers (Basel)
June 2024
Department of Applied Logistics and Polymer Sciences, Kaiserslautern University of Applied Science, Schoenstr. 11, 67659 Kaiserslautern, Germany.
Poly-3-hydroxybutyrate (P3HB) is a biodegradable polyester produced mainly by bacterial fermentation in an isotactic configuration. Its high crystallinity (about 70%) and brittle behavior have limited the process window and the application of this polymer in different sectors. Atactic poly-3-hydroxybutyrate (a-P3HB) is an amorphous polymer that can be synthesized chemically and blended with the isotactic P3HB to reduce its crystallinity and improve its processability Ring-opening polymerization (ROP) is the most cited synthesis route for this polymer in the literature.
View Article and Find Full Text PDFComplex role of chemical nature and tacticity in the adsorption free energy of carboxylic acid polymers at the oil-water interface: molecular dynamics simulations.
Phys Chem Chem Phys
October 2023
Macromolecular Modeling and Simulation Laboratory, Department of Chemical Engineering, Indian Institute of Technology (IIT) Madras, Chennai, 600036, India.
Scientific understanding of the molecular structure and adsorption of polymers at oil-water liquid interfaces is very limited. In this study the adsorption free energy at the oil (CCl)-water interface was estimated using umbrella sampling molecular dynamics simulations for six carboxylate type vinyl polymers differing in hydrophobic nature and tacticity: and poly(acrylic acid) (-PAA, -PAA), and poly(methacrylic acid) (-PMA, -PMA), and and poly(ethylacrylic acid) (-PEA, -PEA). Δ values are in the order -PMA < -PEA < -PEA < -PAA < -PAA < -PMA.
View Article and Find Full Text PDFPolymer Waste-Based Highly Efficient Maleated Interfacial Modifier in iPP/SCF Composites-Some Notes on the Role of Processing in Their Thermal and Dynamic Mechanical Properties.
Polymers (Basel)
March 2023
Polymer Engineering Group (GIP), Polymer Science and Technology Institute (ICTP), Spanish National Research Council (CSIC), C/Juan de la Cierva, 3, 28006 Madrid, Spain.
This work has a two-fold objective. First, it attempts to present the excellent efficiency of a maleated interfacial agent (obtained by the authors by using atactic polypropylene industrial waste) when used as interfacial additive in polypropylene/short carbon fiber composites (iPP/SCF). Second, in this paper, we pay attention to the role played by processing in the final properties of the composite.
View Article and Find Full Text PDFEffect of Polystyrene Synthesis Method on Water Sorption and Glass Transition.
Membranes (Basel)
October 2022
Surface Measurement Systems, 2125 28th Street SW, Suite 1, Allentown, PA 18103, USA.
Commodity PS is synthesized via free radical polymerization, whereas PS in block copolymers (BCPs) is typically synthesized via living anionic polymerization. The purpose of this work is to investigate how the synthesis method impacts important properties such as water sorption and glass transition temperature (). Water sorption is important because the performance of nanostructured polymer membranes in various applications is known to be affected by environmental conditions such as humidity.
View Article and Find Full Text PDFPotential of Functionalized Polyolefins in a Sustainable Polymer Economy: Synthetic Strategies and Applications.
Acc Chem Res
August 2022
SABIC Technology & Innovation, STC Geleen, Urmonderbaan 22, 6160 AH Geleen, The Netherlands.
Polymers play a crucial role in our modern life as no other material exists that is so versatile, moldable, and lightweight. Consequently, the demand for polymers will continue to grow with the human population, modernization, and technological developments. However, depleted fossil resources, increasing plastic waste production, ocean pollution, and related growing emission of greenhouse gases has led to a change in the way we think about the use of polymers.
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