A5081956946- Polymer crystallization and properties
- Analytical Chemistry and Chromatography
- NMR spectroscopy and applications
- Crystallization and Solubility Studies
- Spectroscopy and Chemometric Analyses
- Microfluidic and Capillary Electrophoresis Applications
- Bone Tissue Engineering Materials
- biodegradable polymer synthesis and properties
- Polymer Nanocomposites and Properties
- X-ray Diffraction in Crystallography
- Metabolomics and Mass Spectrometry Studies
- Advanced Polymer Synthesis and Characterization
- Molecular spectroscopy and chirality
- Advanced NMR Techniques and Applications
- Dental materials and restorations
- Mass Spectrometry Techniques and Applications
- Mesoporous Materials and Catalysis
- Radioactive element chemistry and processing
- Dental Implant Techniques and Outcomes
- Environmental Science and Water Management
- Microplastics and Plastic Pollution
- Innovative Microfluidic and Catalytic Techniques Innovation
- Scientific Measurement and Uncertainty Evaluation
- Forensic Fingerprint Detection Methods
- Plant biochemistry and biosynthesis
Fraunhofer Institute for Structural Durability and System Reliability
2013-2023
Fraunhofer Society
2013-2015
Institut für das Bauen mit Kunststoffen
2011
Federal Institute For Materials Research and Testing
2005-2009
Though synthetic plastics are indispensable in our everyday life, the uncertainty surrounding sustainability of fossil reserves has led to development a novel class plastics, referred as bio-based plastics. Poly(lactic) acid (PLA) is most frequently used member this family. However, due lack holistic recycling strategy, its large scale utilization can turn out be an acute source plastic pollution future. Unlike other attempts directed towards chemical PLA which violate basic principles green...
Abstract The commercially available partially bio‐based poly(butylene succinate) (PBS) and succinate‐ co ‐adipate) (PBSA) are subjected to prolonged multiple extrusion cycles investigate their thermal behavior. Empirically, both PBS PBSA form branches at 190°C, with possessing a higher tendency for branching than as studied by rheology size exclusion chromatography (SEC). In each case, the is favored fumaric acid moieties, making susceptible accelerated oxidation. Indeed, NMR signal...
Abstract The chemical composition distribution (CCD) is a fundamental molecular parameter of copolymers. High‐temperature interactive liquid chromatography (HT‐HPLC) has recently emerged as new analytical technique for determination the CCD semicrystalline copolymers ethylene and polar comonomers. With aim comparing results HT‐HPLC with those from traditionally used temperature rising elution fractionation (TREF) crystallization analysis (CRYSTAF) techniques, three ethylene‐vinyl acetate...
The development of a chromatographic method capable to separate poly(methyl methacrylate-stat-methacrylic acid) samples with methacrylic acid contents up 50% by chemical composition is described. For this purpose gradient ranging from chloroform dimethylacetamide on PSS PROTEEMA column was applied. application conventional resulted in severe breakthrough peaks. Therefore, the recently developed concept SEC gradients used. No peaks were observed, and corresponding different content well...
Under the auspices of Organic Analysis Working Group (OAWG) Comité Consultatif pour la Quantité de Matière (CCQM) a laboratory comparison, CCQM-P20.e, was coordinated by Bureau International Poids et Mesures (BIPM) in 2006/2007. Nine national measurement institutes, two expert laboratories and BIPM participated comparison. Participants were required to assign mass fraction theophylline present as main component separate study samples (CCQM-P20.e.1 CCQM-P20.e.2).
High temperature thermal gradient interactive chromatography (HT-TGIC or TGIC) has emerged as an important analytical tool to determine the comonomer content distribution (CCD) present in copolymers of polyethylene (PE). The method separates macromolecules according differences their interactions, solution, with a graphite stationary phase using variant. It is vital gain insight into nature these interactions order further improve separation resolution and increase accuracy CCD measurement....
Multiblock copolymers (MBC) composed of blocks poly(1,4-dioxanone) (PPDO) and poly(∊-caprolactone) (PCL) were investigated in order to gain information on the extend chemical heterogeneity samples. A gradient chromatographic method was established allowing separation purely PPDO- from PCL-containing chains. Application MBC made PCL-diols connected by trimethylhexamethylene diisocyanate (TMDI) resulted two well separated peaks which analyzed means FTIR, 1 H-NMR pyrolysis GC-MS. It shown that...
A size exclusion chromatography (SEC)‐gradient method is developed allowing poly( n ‐butyl acrylate‐ stat ‐acrylic acid)s to be separated with respect content of acrylic acid over the complete composition range. After setting up chromatographic method, samples that, according amounts charged monomers, are expected have identical chemical compared. The chromatograms reveal differences in elution volume, which, by 1 H NMR spectroscopy, can partially traced back polymer composition. In...
We report a new method of preparation poly (butyl acrylate)-g-polystyrene/polystyrene blends by free-radical polymerization. Copolymerization glycidyl (meth)acrylate with butyl acrylate is followed polymer analogous reaction this copolymer acrylic acid and subsequent copolymerization the modified backbone styrene. Investigation on number reactive groups per chain its molecular weight allows grafting efficiencies about 35% to be reached, as well low cross-linking. Blends nanophase-separated...