Calculating Herman's Orientation Factor

Warrier, J. K. S.; Munshi, V.G.; Chidambareswaran, P. K.

doi:10.1177/004051758705700912

Cited by 6 publications

(6 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As illustrated by the azimuthal plot of the (100) scattering in Figure c, a clear trend in reduction in out-of-plane scattering intensities and increase in in-plane scattering intensities can be observed. The Herman’s orientational factor ( H ) − was calculated for these scatterings for a quantitative comparison of the orientation preferences. The (100) scattering from PM6 is predominately out of plane with H = 0.59, suggesting a highly textured structure.…”

Section: Resultsmentioning

confidence: 99%

Synergistically Improving the Absorption, Energy Level, and Crystallization of PM6 by a Dicyanobenzothiadiazole Block-Based Terpolymer Strategy

Shao

Liao

et al. 2022

Chem. Mater.

View full text Add to dashboard Cite

The current top performing polymer solar cells (PSCs) are predominately based on the polymer donor material PM6 paired with Y-series small-molecule acceptors. For the limited improvement space for the Y-series acceptors, it is of great importance to explore strategies to optimize the molecular structure of PM6 for further elevation of the power conversion efficiencies (PCEs). Evidently, the terpolymer strategy is an effective method to improve the inherent properties of PM6 by introducing units with different electron states as building blocks in the copolymer backbone. In this work, a dicyanobenzothiadiazole (CNBT) group was selected and incorporated into the backbone of PM6 to form random terpolymers in a (D−A 1 ) n −(D−A 2 ) m structure with various CNBT contents. The electron-deficient CNBT group induced a strong intermolecular charge transfer, resulting in the rise of a red absorption band, which covered the absorption gap between PM6 and L8-BO around 700 nm. The high electron deficiency of CNBT groups also enabled a downshift in the highest occupied molecular orbital (HOMO) of PM6 for causing improvement of V oc . Furthermore, the high dipole moment of CNBT groups enhanced intermolecular aggregation, which helped to overcome the crystallization reduction effect of the terpolymer structures, leading to optimization of the thin-film morphology. The synergistically enhanced absorption, energy level matching, and crystallization tendency led to simultaneously increased V oc , J sc , and FF, which all contributed to a significantly increased PCE of up to 18.01% compared with the PM6-based devices.

show abstract

Section: Resultsmentioning

confidence: 99%

Synergistically Improving the Absorption, Energy Level, and Crystallization of PM6 by a Dicyanobenzothiadiazole Block-Based Terpolymer Strategy

Shao

Liao

et al. 2022

Chem. Mater.

View full text Add to dashboard Cite

show abstract

“…Following subtraction of the intensity due to the isotropic fraction of the polymer chains (Fig. 1c), we used the azimuthal intensity distribution of the 040 reflection to calculate both its FWHM and the Hermans factor [18, 21–24] for the polymer chains with respect to the draw direction as two complementary measures of the alignment — shown in Fig. 1d and e, respectively.…”

Section: Resultsmentioning

confidence: 99%

Orientated CNT‐polypropylene nanocomposite films made from extruded monofilaments

Tanami¹,

Wachtel²,

Marom³

2013

Polymer Composites

View full text Add to dashboard Cite

In this study, a method for making an orientated polymer nanocomposite film was developed. Melt‐drawn nanocomposite monofilaments of isotactic polypropylene and acicular nanofillers, i.e. carbon nanotubes (CNT) or vapor grown carbon nanofibers (VGCF), were prepared and characterized from the aspect of polymer chain orientation, mechanical properties, and overall morphology. A marked improvement in mechanical properties was observed as a function of the addition of CNT, increasing draw down ratio (DDR) and annealing. Nanocomposite films were prepared from drawn monofilaments by hot‐pressing under low pressure in order to maintain the orientation of the monofilaments. Wide angle X‐ray diffraction showed a high degree of residual orientation in the films. Electron microscopy (high‐resolution scanning electron microscopy, transmission electron microscopy) unexpectedly revealed that the CNT‐matrix interface is amorphous. However, differential scanning calorimetry found no measurable influence of the CNT on the overall crystallinity as determined by the enthalpy of melting of the matrix. POLYM. COMPOS., 2013. © 2013 Society of Plastics Engineers

show abstract

“…The degree of orientation was calculated using Herman's factor. 31 Every sample was measured in three different positions, and the deconvolution and parameter calculation was performed following a reported procedure. 35 The degree of orientation and the Herman orientation factor were determined (Table 1).…”

Section: Waxs Measurementsmentioning

confidence: 99%

“…x CNC = 0.8 nanocellulose bers. 14,31 This is expected from the spinning set-up of the experiment where drawing of the bers was intentionally avoided to reveal the in uence of the inherent interactions between the cationic CNC and anionic TO-CNF on the strength of produced laments. In fact, CNC_acid were mostly disordered (no ow assisted or shear-induced orientation).…”

Section: Orientation In the Laments And Their Crystal Structurementioning

confidence: 99%

Cotton-Quality Fibers from Complexation between Anionic and Cationic Cellulose Nanoparticles

Jaekel,

Torres,

Antonietti

et al. 2024

Preprint

View full text Add to dashboard Cite

Natural polymers are attractive sustainable materials for production of fibers and composite materials. Cotton and flux are traditional plants used to produce textiles with comforting properties while technologies like Viscose, Lyocell and Ioncell-F allowed to extent fiber use into regenerated cellulose from wood. Neither natural nor man-made fibers completely satisfy the needs for cellulose based fabrics boosting development of new approaches to bring more sustainability into the fashion. Technologies like Spinnova® are arising based on the spinning of mechanically pretreated cellulose materials with a lower environmental impact though challenged by the fiber quality and strength related to the inconsistency of the mechanical fibers. Nanoscaled cellulose is an excellent solution to improve the consistency of spin fibers, but charges introduced by traditional chemical treatments prevent rebuilding native hydrogen bonding and compromise the mechanical properties especially in wet conditions. We used nanocellulose with low surface charge isolated using reactive eutectic media to spin fibers able to restore the native hydrogen bonding and enable constitutional mechanical strength of cellulose. We performed un-optimized spinning to reveal the intrinsic properties of the fibers and confirmed the preserved strength of wet fibers compliant with the low surface charge enabling further engineering towards cotton-like fabric from wood.

show abstract

Calculating Herman's Orientation Factor

Cited by 6 publications

References 2 publications

Synergistically Improving the Absorption, Energy Level, and Crystallization of PM6 by a Dicyanobenzothiadiazole Block-Based Terpolymer Strategy

Synergistically Improving the Absorption, Energy Level, and Crystallization of PM6 by a Dicyanobenzothiadiazole Block-Based Terpolymer Strategy

Orientated CNT‐polypropylene nanocomposite films made from extruded monofilaments

Cotton-Quality Fibers from Complexation between Anionic and Cationic Cellulose Nanoparticles

Contact Info

Product

Resources

About