Material Property Tables

Osswald, Tim A.; Baur, Erwin; Brinkmann, Sigrid; Oberbach, Karl; Schmachtenberg, Ernst

doi:10.3139/9783446407923.bm

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Regardless of its variation as a function of the heating/cooling rate, the materials were selected to cover situations above and below T g when investigated at room temperature. There is a relatively good agreement between all references mentioned above and the typical temperature ranges of T g of the polymer matrices used in this study (PP −10–0 °C, LDPE −130–(−110) °C or up to −25 °C, PLA 50–70 °C, PMMA 85–160 °C) [ 33 , 34 , 35 , 36 , 37 ]. The complicated case of T g of polyethylenes is beyond the scope of this article, and readers are referred elsewhere for more details [ 38 ].…”

Section: Resultssupporting

confidence: 84%

“…In general, the polarity of chemical species is determined by the relative permittivity ( ε r ) of the given material. The relative permittivity of each polymer (at low frequencies, i.e., close to DC extrapolation) is known and tabulated (PP 2.1–2.3, LDPE 2.2–2.4, PLA 3.0–3.2, PMMA 3.2–3.4) [ 33 ] or (PP 2.27, LDPE 2.29, PMMA 3.3–3.9) [ 34 ] or (PLA 1.7 [ 35 ], 2.4 [ 36 ], and 2.7 [ 37 ]). The relative permittivity of PLA can be lower than that of polyolefines, which is somewhat contra-intuitive considering the presence of polar units in the polymer.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Polymer Labelling with a Conjugated Polymer-Based Luminescence Probe for Recycling in the Circular Economy

et al. 2020

View full text Add to dashboard Cite

In this paper, we present the use of a disubstituted polyacetylene with high thermal stability and quantum yield as a fluorescence label for the identification, tracing, recycling, and eventually anti-counterfeiting applications of thermoplastics. A new method was developed for the dispersion of poly[1-phenyl-2-[p-(trimethylsilyl)phenyl]acetylene] (PTMSDPA) into polymer blends. For such purposes, four representative commodity plastics were selected, i.e., polypropylene, low-density polyethylene, poly(methyl methacrylate), and polylactide. Polymer recycling was mimicked by two reprocessing cycles of the material, which imparted intensive luminescence to the labelled polymer blends when excited by proper illumination. The concentration of the labelling polymer in the matrices was approximately a few tens ppm by weight. Luminescence was visible to the naked eye and survived the simulated recycling successfully. In addition, luminescence emission maxima were correlated with polymer polarity and glass transition temperature, showing a marked blueshift in luminescence emission maxima with the increase in processing temperature and time. This blueshift results from the dispersion of the labelling polymer into the labelled polymer matrix. During processing, the polyacetylene chains disentangled, thereby suppressing their intermolecular interactions. Moreover, shear forces imposed during viscous polymer melt mixing enforced conformational changes, which shortened the average conjugation length of PTMSDPA chain segments. Combined, these two mechanisms shift the luminescence of the probe from a solid- to a more solution-like state. Thus, PTMSDPA can be used as a luminescent probe for dispersion quality, polymer blend homogeneity, and processing history, in addition to the identification, tracing, and recycling of thermoplastics.

show abstract

Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Polymer Labelling with a Conjugated Polymer-Based Luminescence Probe for Recycling in the Circular Economy

et al. 2020

View full text Add to dashboard Cite

show abstract

Fundamentals and Design‐Led Synthesis of Emulsion‐Templated Porous Materials for Environmental Applications

et al. 2021

View full text Add to dashboard Cite

Emulsion templating is at the forefront of producing a wide array of porous materials that offers interconnected porous structure, easy permeability, homogeneous flow-through, high diffusion rates, convective mass transfer, and direct accessibility to interact with atoms/ions/molecules throughout the exterior and interior of the bulk. These interesting features together with easily available ingredients, facile preparation methods, flexible pore-size tuning protocols, controlled surface modification strategies, good physicochemical and dimensional stability, lightweight, convenient processing and subsequent recovery, superior pollutants remediation/monitoring performance, and decent recyclability underscore the benchmark potential of the emulsion-templated porous materials in large-scale practical environmental applications. To this end, many research breakthroughs in emulsion templating technique witnessed by the recent achievements have been widely unfolded and currently being extensively explored to address many of the environmental challenges. Taking into account the burgeoning progress of the emulsion-templated porous materials in the environmental field, this review article provides a conceptual overview of emulsions and emulsion templating technique, sums up the general procedures to design and fabricate many state-of-the-art emulsion-templated porous materials, and presents a critical overview of their marked momentum in adsorption, separation, disinfection, catalysis/degradation, capture, and sensing of the inorganic, organic and biological contaminants in water and air.

show abstract

Continuous-flow reactor setup for operando x-ray absorption spectroscopy of high pressure heterogeneous liquid–solid catalytic processes

Deschner

Doronkin

Sheppard

et al. 2021

Review of Scientific Instruments

View full text Add to dashboard Cite

A continuous-flow reactor and a continuous-flow setup compatible with operando x-ray absorption spectroscopy (XAS) were designed for safely studying liquid-phase reactions on solid high atomic number transition metal catalysts (e.g., Au, Pd, and Pt) under pressures up to 100 bars with temperatures up to 100 °C. The reactor has a stainless-steel body, 2 mm thick polyether ether ketone (PEEK) x-ray windows, and a low internal volume of 0.31 ml. The rectangular chamber (6 × 5 × 1 mm3) between the PEEK x-ray windows allows us to perform XAS studies of packed beds or monoliths in the transmission mode at any position in the cell over a length of 60 mm. A 146° wide-angle beam access also allows recording complementary x-ray fluorescence or x-ray diffraction signals. The setup was engineered to continuously feed a single-phase liquid flow saturated with one or more gaseous reactants to the liquid–solid XAS reactor containing no free gas phase for enhanced process safety and sample homogeneity. The proof of concept for the continuous-flow XAS cell and high-pressure setup was provided by operando XAS measurements during the direct synthesis of hydrogen peroxide at room temperature and 40 bars using a 35 ± 5 mg catalyst (1 wt. % Pd/TiO2) and inline near-infrared spectroscopy. The experiments prove that the system is well suited to follow the reaction in the liquid phase while recording high-quality XAS data, paving the way for detailed studies on the catalyst structure and structure–activity relationships.

show abstract

Material Property Tables

Cited by 3 publications

References 0 publications

Polymer Labelling with a Conjugated Polymer-Based Luminescence Probe for Recycling in the Circular Economy

Polymer Labelling with a Conjugated Polymer-Based Luminescence Probe for Recycling in the Circular Economy

Fundamentals and Design‐Led Synthesis of Emulsion‐Templated Porous Materials for Environmental Applications

Continuous-flow reactor setup for operando x-ray absorption spectroscopy of high pressure heterogeneous liquid–solid catalytic processes

Contact Info

Product

Resources

About