Plateau Regime Research Articles

Erratum: Proton solvation in protic and aprotic solvents [J. Comput. Chem. 2015, 37, 1082-1091

The authors were using for dimethyl sulfoxide (DMSO) a value of the dielectric constant of 36.7, which is lower than the correct value of 46.7. We are sorry for this confusion. The purpose of this erratum is to demonstrate the consequences on the results using the correct value of the DMSO dielectric constant. With the larger value of the dielectric constant the individual electrostatic solvation energies of the protonated and deprotonated molecular species are all more negative. However, for the computation of pKA values differences of these solvation energies are used, where these changes are nearly compensated. As final result no change in the value of proton solvation in DMSO was obtained remaining at −266.4 kcal/mol.1 The individual computed pKA values exhibit minor changes (see Table 1) with a root mean square deviation (pKA-RMSD) of 0.42 and a mean signed deviation (pKA-MSDnew-old) of −0.2 between the new and old pKA values. The pKA-RMSD between computed and measured pKA values is with 0.65 (without outliers) slightly smaller than before, where it was 0.75. The value of pKA-MSDcomp-exp remains practically the same.1 Hence, pKA values seem to be robust against moderate deviations (less than 20%) of the dielectric constant used for the computation. It can be expected that this is less the case for variations of atomic radii and atomic partial charges. As an aprotic solvent DMSO does not possess polar hydrogen atoms. Due to the lack of polar hydrogens the atomic charges of the solvent molecules come less close to atoms of solute molecule than in case of a protic solvent like water. To account for this solvation effect the solute atomic radii must be enlarged compared to the atomic radii in water. For this purpose, we use radii enhancement factors, which are determined by minimizing the pKA-RMSD of measured and computed pKA values. Figure 1 shows the dependence of the pKA-RMSD and the proton solvation energy as a function of the enhancement factor α. The optimal value of the enhancement factor is α = 1.28, if the three compounds, 17, 18, 19, involving a sulfur atom are ignored. The resulting proton solvation energy of −266.4 kcal/mol is again in a plateau regime. Considering the three sulfur compounds separately, the optimized sulfur radius is 2.18 Å, which is the same value as before.1 However, when including these three sulfur compounds in the optimization procedure the smallest pKA-RMSD of 0.65 is obtained with the enhancement factor α = 1.25 and the proton solvation energy is −266.4 kcal/mol as obtained before.1 pKA-RMSD value (•, left scale) and proton solvation energy [kcal/mol] (◊, right scale) for DMSO are plotted as a function of the multiplicative atomic radius enhancement factor α. Ignoring the three sulfur compounds (No. 17–19) the optimal enhancement factor is 1.28 yielding a pKA-RMSD value of 0.65. The resulting proton solvation energy is −266.4 kcal/mol.1 Finally we like to correct Table 1 in the referred article, since the references to the literature were skewed. Again we are very sorry for the confusion.

Phase properties of the cutoff high-order harmonics

The cut-off regime of high-order harmonic generation (HHG) by atoms in an intense laser field is studied numerically and analytically. We find that the cut-off regime is characterized by equal dephasing between the successive harmonics. The change of the harmonic phase-locking when HHG evolves from the cut-off to the plateau regime determines the optimal bandwidth of the spectral region which should be used for attosecond pulse generation via amplitude gating technique. The cut-off regime is also characterized by a linear dependence of the harmonic phase on the fundamental intensity. The proportionality coefficient grows as the cube of the fundamental wavelength, thus this dependence becomes very important for the HHG by mid-infrared fields. Moreover, for every high harmonic there is a {\it range} of laser intensities providing the generation in the cut-off regime and the atomic response magnitude in this regime can be greater than that in the plateau regime. Thus the cut-off regime substantially contributes to the harmonic energy emitted under typical experimental conditions where the laser intensity varies in time and space.

Ageing Scher–Montroll Transport

We study the properties of ageing Scher–Montroll transport in terms of a biased subdiffusive continuous time random walk in which the waiting times $$\tau $$ between consecutive jumps of the charge carriers are distributed according to the power law probability $$\psi (t)\simeq t^{-1-\alpha }$$ with $$0<\alpha <1$$ . As we show, the dynamical properties of the Scher–Montroll transport depend on the ageing time span $$t_{a}$$ between the initial preparation of the system and the start of the observation. The Scher–Montroll transport theory was originally shown to describe the photocurrent in amorphous solids in the presence of an external electric field, but it has since been used in many other fields of physical sciences, in particular also in the geophysical context for the description of the transport of tracer particles in subsurface aquifers. In the absence of ageing ( $$t_{a}=0$$ ) the photocurrent of the classical Scher–Montroll model or the breakthrough curves in the groundwater context exhibit a crossover between two power law regimes in time with the scaling exponents $$\alpha -1$$ and $$-1-\alpha $$ . In the presence of ageing a new power law regime and an initial plateau regime of the current emerge. We derive the different power law regimes and crossover times of the ageing Scher–Montroll transport and show excellent agreement with simulations of the process. Experimental data of ageing Scher–Montroll transport in polymeric semiconductors are shown to agree well with the predictions of our theory.

Steady shear viscosity and oscillatory complex viscosity of poly(p-phenylene terephthalamide) solutions in sulfuric acid

This study investigated the steady shear viscosity η and the oscillatory complex viscosity η ∗ of poly(p-phenylene terephthalamide) solutions in sulfuric acid (PPTA/H2SO4) by rheometric measurements. The influences of steady shear rate, concentration, and temperature were investigated in detail. The results indicated that in the plateau regime (η independent of $$ \overset{.}{\gamma } $$ regime), η shows a non-monotonic variation with the concentration increase, which reaches the maximum value when the solution changes from the isotropic phase into the nematic–isotropic biphasic system. At the low shear rate, the corresponding critical concentration $$ {C}_{\eta}^{\ast } $$ is close to the critical concentration C ∗, at which the birefringence emerges in solutions. In the plateau regime, the dependence of η on temperature follows different rules when the system is in different phases. In the isotropic phase, η decreases with the increasing temperature and obeys the Arrhenius exponential rule. Unlike the isotropic solution, η increases with the temperature in the nematic–isotropic biphasic region and decreases linearly with the temperature in the nematic phase region. The η ∗measured at different angular frequencies (ω) was compared with η measured at different $$ \overset{.}{\gamma } $$ . For the isotropic solutions, the |η ∗|~ω curve coincides with the η~ $$ \overset{.}{\gamma } $$ variation in a wide shear rate range for the plateau regime, while in the nematic phase region, |η ∗| is always smaller than η. For the biphasic systems, the consistency can be seen only in a narrow shear rate range and |η ∗| deviates from η with the increasing shear rate.

Dielectric, complex impedance and electrical conductivity studies of the multiferroic Sr2FeSi2O7-crystallized glass-ceramics

In this paper, the Sr2FeSi2O7-crystallized glass-ceramics was successfully prepared by conventional melt casting followed by heat treatment method in the SrO–Fe2O3–SiO2–B2O3 glass system. The XRD, SEM and EDS results show that the crystalline Sr2FeSi2O7 is obtained with uniform microstructures and its grain size around 0.5–0.7 μm. The magnetization hysteresis (M−H) loop of the glass-ceramics exhibits typical ferromagnetic behavior with saturation magnetization values Ms = 10.527 emu/g and coercive field Hc = 210.462 Oe. In addition, some electric characteristics of (dielectric, impedance and conductivity) of the glass-ceramics have been investigated in a wide rang of frequency (20 Hz–2000 kHz) and temperature (220–440 °C) ranges. The dielectric dispersion phenomenon in ε′ and ε'' with frequency can be explained by Maxwell–Wagner model. Moreover, the complex impedance measurement provides a clear rationalization of the Maxwell–Wagner type of relaxation, namely crystalline phase and glassy phase contributions. The step-like feature of ac conductivity, plateau and dispersive regime can be explained by the Jump Relaxation Model (JRM) and dc conductivity is found to obey the Arrhenius law. The temperature dependence of n is investigated to explain the conduction mechanism in the different parts, which is attributed to the CBH model in Part-1 and the OLPT model in Part-2. The investigations of both complex impedance and conductivity show the NTCR character of the sample.

Mixed-mode fracture in a quasi-brittle material: R-curve and fracture criterion – Application to wood

Mixed-Mode Bending tests are performed on spruce specimens for several mixed mode ratios and are completed by pure mode I (DCB) and pure mode II (ENF) fracture tests. For each test, the mixed mode resistance to crack growth and those relative to its mode I and mode II components are estimated. The separation of the fracture modes is estimated from an analytical formulation and verified from the invariant Mθ-integral method. A mixed mode fracture criterion applicable to the overall R-curve (i.e., rising part and plateau regime) is then proposed and allows describing the mixed mode resistance with a reasonable accuracy.

MultiDark simulations: the story of dark matter halo concentrations and density profiles

Accurately predicting structural properties of dark matter halos is one of the fundamental goals of modern cosmology. We use the new suite of MultiDark cosmological simulations to study the evolution of dark matter halo density profiles, concentrations, and velocity anisotropies. The MultiDark simulations cover a large range of masses 1e10-1e15Msun and volumes upto 50Gpc**3. The total number of dark matter halos in all the simulations exceeds 60 billion. We find that in order to understand the structure of dark matter halos and to make ~1% accurate predictions for density profiles, one needs to realize that halo concentration is more complex than the traditional ratio of the virial radius to the core radius in the NFW profile. For massive halos the averge density profile is far from the NFW shape and the concentration is defined by both the core radius and the shape parameter alpha in the Einasto approximation. Combining results from different redshifts, masses and cosmologies, we show that halos progress through three stages of evolution. (1) They start as rare density peaks that experience very fast and nearly radial infall. This radial infall brings mass closer to the center producing a high concentrated halo. Here, the halo concentration increases with the increasing halo mass and the concentration is defined by the alpha parameter with nearly constant core radius. Later halos slide into (2) the plateau regime where the accretion becomes less radial, but frequent mergers still affect even the central region. Now the concentration does not depend on halo mass. (3) Once the rate of accretion slows down, halos move into the domain of declining concentration-mass relation because new accretion piles up mass close to the virial radius while the core radius is staying constant. We provide accurate analytical fits to the numerical results for halo density profiles and concentrations.

Transport theory for energetic alpha particles in finite aspect ratio tokamaks with broken symmetry

Transport theory for the energetic alpha particles in finite aspect ratio tokamaks with broken symmetry is developed for the case where the slowing down collision operator dominates. The transport fluxes in the 1/ν and superbanana plateau regimes are derived. Here, ν is the typical collision frequency. They can be used in modeling the energy loss of the alpha particles in thermonuclear fusion reactors. Numerical realizations of the superbanana orbits of alpha particles in tokamaks with broken symmetry are also presented. The existence of the superbananas corroborates the predictions of the theories presented here and elsewhere.

Mechanical Reinforcement of Proteins with Polymer Conjugation.

Conjugating poly(ethylene glycol) (PEG) to peptides, also known as PEGylation, is proven to increase the thermodynamical stability of peptides, and has been successfully applied to prolong the lifetime of peptide-based vaccines and therapeutic agents. While it is known that protein structure and function can be altered by mechanical stress, whether PEGylation can reinforce proteins against mechanical unfolding remains to be ascertained. Here, we illustrate that PEGylation prolongs the lifetime of α-helices subject to constant stress. PEGylation is found to increase the unfolding time through two mechanisms. We see that (1) the unfolding rate of a helical segment is decreased through prolonged plateau regimes where the peptide helical content remains constant, and (2) the proportion of refolding to unfolding is increased, primarily by shielding water molecules from replacing forcibly exposed backbone hydrogen bonds near the conjugation site. Our findings demonstrate the feasibility of improving peptide mechanical stability with polymer conjugation. This provides a basis for future studies on optimizing conjugation location and chemistry to build custom biomolecules with unforeseen mechanical functions and stability.

Cell Wall Buckling Mediated Energy Absorption in Lotus-type Porous Copper

The energy absorption characteristics of the lotus-type porous coppers at the strain rate of 10–3 s–1 to ~2400 s–1 were systematically investigated. Depending on the relative density and loading rate, the energy absorption capability of the tested samples varied from ~20 to ~85 MJ m–3, while the energy absorption efficiency fluctuated around ~0.6. An energy absorption efficiency curve based approach was proposed for unambiguous identification of the plateau regime, which gave an extension of ~0.50 strain range for the presently investigated porous coppers. With detailed observations of cell wall morphologies at various deformation stages, it was suggested that buckling of cell walls was the dominant mechanism mediating the energy absorption in lotus-type porous coppers.

Core-Shell-Structured Copolyaniline-Coated Polymeric Nanoparticle Suspension and Its Viscoelastic Response under Various Electric Fields

Semi-conducting poly(n-methylaniline) (PNMA)-coated poly(methyl methacrylate) (PMMA) composite nanoparticles were synthesized using cross-linked and grafted PMMA particles as a core, and then, the PNMA shell was coated via chemical oxidative polymerization on the surface of modified PMMA nanoparticles. Their electroresponsive electrorheological characteristics when dispersed in silicone were confirmed under applied electric fields using a rotational rheometer, focusing on their viscoelastic response. Using a frequency sweep test, the frequency dependence of both the storage and loss moduli was confirmed to increase upon increasing the electric field, with a stable plateau regime over the entire angular frequency range.

Experimental and computational micro-mechanical investigations of compressive properties of polypropylene/multi-walled carbon nanotubes nanocomposite foams

The compressive behavior of nanocomposite foams is studied by both experimental and computational micro-mechanics approaches with the aim of providing an efficient computational model for this kind of material.The nanocomposites based on polypropylene (PP) and different contents of multi-walled carbon nanotubes (CNTs) are prepared by melt mixing method. The nanocomposite samples are foamed using super-critical carbon dioxide (ScCO2) as blowing agent at different soaking temperatures. The influence of this foaming parameter on the morphological characteristics of the foam micro-structure is discussed. Differential Scanning Calorimetry (DSC) measurements are used to quantify the crystallinity degree of both nanocomposites and foams showing that the crystallinity degree is reduced after the foaming process. This modification leads to mechanical properties of the foam cell walls that are different from the raw nanocomposite PP/CNTs material. Three-point bending tests are performed on the latter to measure the flexural modulus in terms of the crystallinity degree. Uniaxial compression tests are then performed on the foamed samples under quasi-static conditions in order to extract the macro-scale compressive response.Next, a two-level multi-scale approach is developed to model the behavior of the foamed nanocomposite material. On the one hand, the micro-mechanical properties of nanocomposite PP/CNTs cell walls are evaluated from a theoretical homogenization model accounting for the micro-structure of the semi-crystalline PP, for the degree of crystallinity, and for the CNT volume fraction. The applicability of this theoretical model is demonstrated via the comparison with experimental data from the described experimental measurements and from literature. On the other hand, the macroscopic behavior of the foamed material is evaluated using a computational micro-mechanics model using tetrakaidecahedron unit cells and periodic boundary conditions to estimate the homogenized properties. The unit cell is combined with several geometrical imperfections in order to capture the elastic collapse of the foamed material. The numerical results are compared to the experimental measurements and it is shown that the proposed unit cell computational micro-mechanics model can be used to estimate the homogenized behavior, including the linear and plateau regimes, of nanocomposite foams.

Critical examination of chemically modified hybrid thermosets: Synthesis, characterization and mechanical behavior in the plateau regime of polyaminosiloxane-nitrile-DGEBA

Poly(3-aminopropylmethylsiloxane) has been modified with acrylonitrile via aza Michael addition and a broad range of modified oligomers have been prepared with CN:NH2 ratio ranging between 0.1 and 1. NMR and FTnIR analysis reveals that acrylonitrile modification proceeds without formation of tertiary amines. Modified oligomers have been characterized by DSC and analysis of Tg reveals that the adducts are self-associated probably due to weak hydrogen bonding and dipole interactions. The modified oligomers with a modification degree higher than 0.4 were miscible with DGEBA. The low and high temperature relaxations of the cured thermosets have been measured by DMTA. In addition to the commonly observed β2 relaxation, a new β1 process linked by an isosbestic point to β2 has been found. β1 is attributed to an extended segment comprising the pendant propionitrile group as well as the aminopropyl segment that connects tertiary amines to the polysiloxane backbone. Elastic modulus as well as the α relaxation can be tuned from high Tg and high rubbery modulus to low Tg and high damping thermosets changing the nitrile content. The experimental network structure obtained from elastic measurements and the Tg were related through well established structure-property relations.

Foam-like compression behavior of fibrin networks.

The rheological properties of fibrin networks have been of long-standing interest. As such there is a wealth of studies of their shear and tensile responses, but their compressive behavior remains unexplored. Here, by characterization of the network structure with synchronous measurement of the fibrin storage and loss moduli at increasing degrees of compression, we show that the compressive behavior of fibrin networks is similar to that of cellular solids. A nonlinear stress-strain response of fibrin consists of three regimes: (1) an initial linear regime, in which most fibers are straight, (2) a plateau regime, in which more and more fibers buckle and collapse, and (3) a markedly nonlinear regime, in which network densification occurs by bending of buckled fibers and inter-fiber contacts. Importantly, the spatially non-uniform network deformation included formation of a moving "compression front" along the axis of strain, which segregated the fibrin network into compartments with different fiber densities and structure. The Young's modulus of the linear phase depends quadratically on the fibrin volume fraction while that in the densified phase depends cubically on it. The viscoelastic plateau regime corresponds to a mixture of these two phases in which the fractions of the two phases change during compression. We model this regime using a continuum theory of phase transitions and analytically predict the storage and loss moduli which are in good agreement with the experimental data. Our work shows that fibrin networks are a member of a broad class of natural cellular materials which includes cancellous bone, wood and cork.

Disorder-enhanced nuclear spin relaxation at Landau level filling factor one**Project supported by the National Basic Research Program of China (Grant Nos. 2012CB921703 and 2015CB921102), the National Natural Science Foundation of China (Grant Nos. 91121003, 11374337, and 61425015), the Chinese Academy of Sciences, the BMBF, and the German–Israel Foundation.

The nuclear spin relaxation rate (1/T1) is measured for GaAs two-dimensional (2D) electron systems in the quantum Hall regime with an all-electrical technique for agitating and probing the nuclear spins. A “tilted plateau” feature is observed near the Landau level filling factor ν = 1 in 1/T1 versus ν. Both the width and magnitude of the plateau increase with decreasing electron density. At low temperatures, 1/T1 exhibits an Arrhenius temperature dependence within the tilted plateau regime. The extracted energy gaps are up to two orders of magnitude smaller than the corresponding charge transport gaps. These results point to a nontrivial mechanism for the disorder-enhanced nuclear spin relaxation, in which microscopic inhomogeneities play a key role for the low energy spin excitations related to skyrmions.

Planar laser-induced incandescence of turbulent sooting flames: the influence of beam steering and signal trapping

The influence of beam steering and signal trapping on the accuracy of soot volume fractions measured using planar laser-induced incandescence (LII) has been investigated in turbulent non-premixed sooting flames at atmospheric pressure. In turbulent non-premixed C2H4/air flames, the influence of local de-focusing/focusing of the laser sheet from beam steering can result in the underestimate of the averaged LII signal by 30 %, even when operating within the so-called plateau regime of laser fluence. Beam steering was also found to be significant in both the upstream region of C2H4/air flames and non-reacting C2H4 flows, because the fuel has a relatively high refractive index compared with ambient air. The extent of beam steering at different heights of reacting and isothermal flows as well as its dependence on exit Reynolds number (Re) has been measured. The measurements reveal that even at low turbulence levels (2000 < Re < 3000), beam steering effects can be significant. Also found is that the LII signal at a 450 nm wavelength can be attenuated by a few per cent at high soot loading regions in turbulent flames due to signal trapping. Finally, the feasibility of directly evaluating the signal attenuation via planar LII results was assessed by comparing the virtual soot attenuation calculated based on the planar LII result with that measured using light-of-sight extinction.

Systematics, biogeography, and character evolution of Deutzia (Hydrangeaceae) inferred from nuclear and chloroplast DNA sequences

The genus Deutzia (Hydrangeaceae), containing ca. 60 species circumscribed in three sections, is disjunctly distributed in eastern Asia and Central America (Mexico). Although the genus is well delimited, its subdivisions into sections and series have not been the subject of an explicit test of monophyly based on molecular data. A comprehensive examination of the evolutionary relationships within the genus is thus still lacking. We present a fossil-calibrated, molecular phylogeny of Deutzia based on two nuclear ribosomal DNA (ITS and 26S) and three chloroplast DNA regions (matK, rbcL, and trnL-F intergenic spacer). Within this framework, we examine character evolution in petal arrangement, filament shape, and the number of stamens, and infer the ancestral area and biogeographic history of the genus. Our molecular phylogeny suggests that Deutzia is monophyletic. Two major clades are recovered: one composed of the species of sect. Neodeutzia from Mexico, and the other containing all remaining Deutzia species of sections Mesodeutzia and Deutzia from SW China and Northeast Asia. The latter two Asian sections were each revealed to be polyphyletic. The induplicate petals, 2-dentate filaments, and polystemonous androecia are inferred to be ancestral character states. Biogeographic reconstructions suggest a Northeast Asian origin for the genus and subsequent spread to Mexico during the Oligocene and to SW China during the Miocene. Based on our results, a new infrageneric classification of Deutzia inferred from molecular phylogeny is required. We propose to merge sections Mesodeutzia and Deutzia to ensure the monophyly at the sectional level. Cooling trends during the Oligocene resulted in isolation, separating eastern Asian and Mexican taxa, while the warm period during the middle Miocene stimulated the diversification from Northeast Asia to SW China. The uplift in the Qinghai-Tibetan Plateau and monsoon regimes are important in promoting high species diversification of Deutzia in SW China.

Nonlinear ion transport in the supercooled ionic liquid 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide: Frequency dependence of third-order and fifth-order conductivity coefficients.

We have carried out nonlinear ion conductivity measurements on the supercooled ionic liquid 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide[C6mim][NTf2] by applying ac electric fields with amplitudes up to about 200 kV/cm. At these field amplitudes, 3ω and 5ω harmonic components in the current response were detected, and the higher-order conductivity coefficients σ3 (1),σ3 (3),σ5 (3), and σ5 (5) were determined. The frequency and temperature dependence of these conductivity coefficients was analyzed in detail. The most important findings were the following: (i) The third-order spectra σ3 (1) and σ3 (3) exhibit very similar values in the dc plateau regime but differ considerably in the dispersive regime. The same was observed for the fifth order spectra σ5 (3) and σ5 (5). (ii) In the dispersive regime, the third-order spectra display a minimum, while the fifth-order spectra display a maximum. (iii) The frequencies of these minima and maxima are thermally activated with the same activation energy as the low-field dc conductivity σ1,dc, whereas the dc values of the higher-order conductivity coefficients, σ3,dc and σ5,dc, are characterized by lower activation energies.

Langmuir monolayers of non-ionic polymers: Equilibrium or metastability? Case study of PEO and its PPO–PEO diblock copolymers

Stability and reorganization in Langmuir films of PEO in PEO homopolymers and PPO–PEO block copolymers were investigated using film balance measurements. The apparent fractional losses of EO segments transferred into the subphase resulting from successive compression–expansion cycles have been estimated. The apparent loss is mainly Γmax, Mn and time-dependent. At surface concentrations Γ⩽0.32mg/m2, PEO films are in equilibrium. For 0.32⩽Γ⩽0.7mg/m2, the losses remain modest. Further compression leads to densification of the monolayer, requiring the interplay of thermodynamics and kinetic factors In the plateau regime, the loss is higher and constant for 1⩽Γmax⩽2mg/m2 upon maintaining the achieved surface area for 15min. Similar losses were obtained for PEO homopolymers of high Mn and PPO353–PEO2295. It suggests that the PEO remains anchored in a metastable state at the air–water interface at surface concentration well above the onset of the plateau. Additional losses are incurred for PEO homopolymers for monolayers kept compressed in the plateau for 2h. For the interpretation of these phenomena a combination of elements from self-consistent field theory and scaling is desirable with as a trend an increasing contribution of the latter with increasing surface concentration.

Synthesis and Characterization of Polysulfone-Containing Poly(butylene terephthalate) Segmented Block Copolymers

A facile synthetic approach to segmented polysulfone-containing polyesters affords a versatile family of high-temperature thermoplastics with tunable thermomechanical properties. End-capping of phenol-terminated polysulfone (PSU) using ethylene carbonate generated telechelic oligomers with primary alcoholic functionality. Melt transesterification of dimethyl terephthalate and 1,4-butanediol in the presence of PSU oligomers yielded high molecular weight segmented block copolymers with alternating PSU and poly(butylene terephthalate) (PBT) sequences. Systematic variation in PSU incorporation resulted in tunable PBT segment length and accompanying thermal properties. DSC and SAXS elucidated a miscible, amorphous PSU and PBT phase, and PBT crystallinity remained below an 80 wt % incorporation of PSU. Dynamic mechanical analysis (DMA) revealed a crystallinity-dependent plateau regime above the copolymers glass transition temperature (Tg), while SAXS and WAXD confirmed a semicrystalline morphology below 80 wt %...