We report on structural investigations of a series regioregular poly(3-hexylthiophene) with well-defined molecular weight (5−19 kg/mol) using DSC, small angle and wide-angle X-ray scattering, AFM. With increasing temperature, we identify three ordered phases, namely 3D crystalline, 2D crystalline disordered side chains, layered phase smectic symmetry, followed by complete melting. Although all samples crystallize in extended chain conformation, the lower material exhibits crystallinity, most...

Kitset hollow spheres: The combination of twin polymerization with hard templates makes carbon spheres (HCSs) tailored properties easily accessible. thickness and pore texture the HCS shells also diameter spherical cavity can be varied. application potential synthesized is substantiated by an excellent cycling stability lithium–sulfur batteries.

Crystallization of polymers from entangled melts generally leads to the formation semicrystalline materials with a nanoscopic morphology consisting stacks alternating crystalline and amorphous layers. The factors controlling thickness layers are well studied; however, there is no quantitative understanding We elucidate effect entanglements on by use series model blends high-molecular-weight unentangled oligomers leading reduced entanglement density in melt as characterized rheological...

To achieve better performance and processability of semicrystalline polymers [especially with ultrahigh molecular weight (MW)], miscible oligomers or solvents are usually involved to disentangle polymer melt reduce its viscosity. Entanglements, crystallization temperature, possible phase segregation behavior make it complicated predict the morphologies crystals containing low MW fractions. In our recent work [Proc. Natl. Acad. Sci. U. S. A. 2023, 120 (27), e2217363120], by blending high-MW...

We present a model free analysis of the structure microporous carbon (Kynol fiber cloth) with neutrons (SANS) and X-rays (SAXS). SANS contrast matching is used to analyze accessible pores. It shown that SAXS- SANS-intensities agree after correction specific background. Moreover, we scattering contribution due finite size bending sheets. This scales q−2 at high q-values (q: magnitude vector) subtracted remaining intensity exhibits q−4 final slope gives inner surface (1090 m2/g) porosity (29%)...

Metal ion tracking allows monitoring of the healing process in supramolecular polymers on nanoscale.

Semicrystalline polymers have been classified into crystal-mobile and crystal-fixed polymers, depending on the existence or absence of intracrystalline chain dynamics. Although it was claimed that with dynamics generally a higher crystallinity, its effect semicrystalline morphology is not known in detail. Using new approach for quantitative analysis small-angle X-ray scattering data, we compare structural characteristics fully crystallized samples two model without motion crystallites....

The analysis of sulfur distribution in porous carbon/sulfur nanocomposites using small-angle X-ray scattering (SAXS) is presented. Ordered CMK-8 carbon was used as the host matrix and gradually filled with (20-50 wt %) via melt impregnation. Owing to almost complete match between electron densities sulfur, present essence a two-phase system filling material can be precisely followed by this method. absolute intensities normalized per unit mass were corrected accounting for contribution...

The structural, thermomechanical, and viscoelastic properties of metallosupramolecular polymers (MSPs) can be controlled through the choice multiligand monomer nature metal salt from which these materials are assembled. This versatility dynamic certain metal–ligand (ML) complexes make MSPs very interesting for design stimuli-responsive materials. We here report on investigation structure–property relationships based a macromonomer formed by terminating telechelic poly(ethylene-co-butylene)...

Using Fast Scanning Calorimetry we investigate the effect of intracrystalline chain dynamics on melting, recrystallization and crystal reorganization during heating, whereby employ polyethyleneoxide (PEO) polycaprolactone (PCL) as model polymers with without such dynamics. We show that in PCL marginally stable crystallites form isothermal crystallization, which melt immediately upon heating. During further heating continuous melting occurs. At low crystallization temperatures PEO shows a...

Abstract Based on a limited set of model samples it has been recently shown that semicrystalline polymers exhibit different morphological characteristics depending the existence and timescale intracrystalline chain diffusion (ICD) relative to kinetics crystal growth. Here, generality these reports for case so‐called crystal‐fixed without or very slow ICD is tested by providing detailed nuclear magnetic resonance (NMR) small‐angle X‐ray scattering analysis polybutylene succinate (PBS),...

Starting from established concepts that describe the dynamics of cantilever in a scanning force microscope operated intermittent contact mode as driven harmonic oscillator, we introduce effective interaction parameters based on Fourier coefficients to forces. These are linear forces and separate conservative dissipative contributions. They allow qualitative description process enable thorough discussion influence experimental measured data. Exemplary spectroscopy data obtained hard soft...

This study highlights the advantages of using wide-angle X-ray scattering (WAXS) and small-angle neutron (SANS) methods to analyse turbostratic D-glucose-derived hard carbons (GDCs) over a wide range length scales. It demonstrates reasons for superior performance (HCs) pyrolysed at 1100°C compared those 700°C, 1000°C, or 1400°C in sodium-ion batteries (SIBs). Twelve WAXS thirteen SANS structural parameters were simultaneously determined HCs. The investigation incorporates WAXS-derived...

Hohlkugeln in Leichtbauweise: Die Kombination der Zwillingspolymerisation mit harten Templaten macht Kohlenstoffhohlkugeln (KHK) maßgeschneiderten Eigenschaften zugänglich. Dabei können die Dicke und Porentextur Schalen sowie Durchmesser des Kugelhohlraumes gezielt eingestellt werden. Das Anwendungspotenzial auf diese Weise hergestellter poröser KHK wird durch eine herausragende Zyklenstabilität Lithium-Schwefel-Zellen illustriert.

The biodegradation of isodimorphic random butanediol-succinate/adipate copolymers (PBSAs) can be affected by a change in the semicrystalline morphology. A crucial point for final structure is incorporation monomers minority component into crystals majority component. We use proton time-domain NMR and wide-angle X-ray scattering to characterize across their complete composition range analyze possible inclusion comonomers PBA-rich 20/80 PBS-rich 60/40 applying different solid-state 13C...

The application of porous carbon is versatile. It used for high-performance catalyst support, electrode material in batteries, and gas storage. In each these fields nanostructuring improves the properties. Supercapacitors store a high energy density. Exactly adapted structures increase life lithium batteries protect catalysts with increasing reaction rate selectivity. Most materials have spherical shape. To best our knowledge, there no procedure to synthesize nanostructured cylindrical...

The manuscript describes quantitative morphological and structural information for the nanoporous RP-20 powder andelectrode based on that carbon - studied with X-ray microcomputed tomography, small-angle neutron scattering, scattering techniques. μCT measurements demonstrated diffusion process inside of electrode is significantly influenced by nature solvent. SAXS were performed in order to collect powder-polytetrafluoroethylene binder material. Comparison complementary techniques, i.e.,...

Water-insoluble α-glucans synthesized from sucrose by glucansucrases Streptococcus spp. are essential in dental plaque and caries formation. Because limited information is available on the fine structure of these biopolymers, we analyzed structures unmodified glucans produced five recombinant (S.) mutans DSM 20523 S. salivarius 20560 detail. A combination methylation analysis, endo-dextranase endo-mutanase hydrolyses, HPSEC-RI was used. Furthermore, crystal-like regions were using XRD