Revealing Temperature-Dependent Polymer Aggregation in Solution with Small-Angle X-ray Scattering

2022 ◽  
Author(s):  
Thomas Chaney ◽  
Maged A. Abdelsamie ◽  
Hongping Yan ◽  
Sebastian Schneider ◽  
Ismail Alperen Ayhan ◽  
...  
Keyword(s):  
Organic Photovoltaics ◽  
Small Angle ◽  
Bulk Heterojunction ◽  
Temperature Dependent ◽  
X Ray ◽  
X Ray Scattering ◽  
Active Layers ◽  
Ray Scattering

Improving the morphology of bulk heterojunction active layers remains a primary challenge for organic photovoltaics (OPVs), and much research has been devoted to achieving this through modifying OPV casting solutions...

Temperature-dependent small-angle x-ray scattering from poly(vinylidene fluoride)

1980 ◽  
Vol 51 (10) ◽  
pp. 5508 ◽  
Author(s):  
J. M. Schultz ◽  
J. S. Lin ◽  
R. W. Hendricks ◽  
R. R. Lagasse ◽  
R. G. Kepler
Keyword(s):  
Small Angle ◽  
Vinylidene Fluoride ◽  
Temperature Dependent ◽  
X Ray ◽  
X Ray Scattering ◽  
Poly Vinylidene Fluoride ◽  
Ray Scattering

scholarly journals Supramolecular Dimerization in a Polymer Melt from Small-Angle X-ray Scattering and Rheology: A Miscible Model System

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 880
Author(s):  
Mariapaola Staropoli ◽  
Margarita Kruteva ◽  
Jürgen Allgaier ◽  
Andreas Wischnewski ◽  
Wim Pyckhout-Hintzen
Keyword(s):  
Hydrogen Bonding ◽  
Small Angle ◽  
Full Range ◽  
Polymer Melt ◽  
Self Healing ◽  
Temperature Dependent ◽  
Base Pairs ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

We present a structural and dynamic study on the simplest supramolecular hetero-association, recently investigated by the authors to prepare architectural homogeneous structures in the melt state, based on the bio-inspired hydrogen-bonding of thymine/diaminotriazine (thy–DAT) base-pairs. In the combination with an amorphous low Tg poly(butylene oxide) (PBO), no micellar structures are formed, which is expected for nonpolar polymers because of noncompatibility with the highly polar supramolecular groups. Instead, a clear polymer-like transient architecture is retrieved. This makes the heterocomplementary thy–DAT association an ideal candidate for further exploitation of the hydrogen-bonding ability in the bulk for self-healing purposes, damage management in rubbers or even the development of easily processable branched polymers with built-in plasticizer. In the present work, we investigate the temperature range from Tg + 20 °C to Tg + 150 °C of an oligomeric PBO using small-angle X-ray scattering (SAXS) and linear rheology on the pure thy and pure DAT monofunctionals and on an equimolar mixture of thy/DAT oligomers. The linear rheology performed at low temperature is found to correspond to fully closed-state dimeric configurations. At intermediate temperatures, SAXS probes the equilibrium between open and closed states of the thy–DAT mixtures. The temperature-dependent association constant in the full range between open and closed H-bonds and an enhancement of the monomeric friction coefficient due to the groups is obtained. The thy–DAT association in the melt is more stable than the DAT–DAT, whereas the thy–thy association seems to involve additional long-lived interactions.

Temperature-Dependent Atomic Models of Detergent Micelles Refined against Small-Angle X-Ray Scattering Data

2018 ◽  
Vol 130 (20) ◽  
pp. 5737-5741
Author(s):  
Miloš T. Ivanović ◽  
Linda K. Bruetzel ◽  
Jan Lipfert ◽  
Jochen S. Hub
Keyword(s):  
Small Angle ◽  
Scattering Data ◽  
Temperature Dependent ◽  
X Ray ◽  
Atomic Models ◽  
X Ray Scattering ◽  
Detergent Micelles ◽  
Ray Scattering

Portable mini-chamber for temperature dependent studies using small angle and wide angle x-ray scattering

2018 ◽  
Author(s):  
Arun Singh Dev ◽  
Dileep Kumar ◽  
Satish Potdar ◽  
Pallavi Pandit ◽  
Stephan V. Roth ◽  
...  
Keyword(s):  
Small Angle ◽  
Wide Angle ◽  
Temperature Dependent ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals Temperature-Dependent Small-Angle X-Ray Scattering from Polyethylene

1977 ◽  
Vol 9 (2) ◽  
pp. 115-120
Author(s):  
Rakesh Raman ◽  
Basanti L Deopura ◽  
Dharmendra S Varma ◽  
Vishambher D Gupta
Keyword(s):  
Small Angle ◽  
Temperature Dependent ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Aggregation in aluminium hydroxide solutions investigated by small-angle X-ray scattering

1994 ◽  
Vol 27 (5) ◽  
pp. 682-692 ◽  
Author(s):  
S. S. Kumru ◽  
H. D. Bale
Keyword(s):  
Small Angle ◽  
Aluminium Hydroxide ◽  
Radius Of Gyration ◽  
Fractal Structures ◽  
Temperature Dependent ◽  
X Ray ◽  
X Ray Scattering ◽  
Hydrolysis Of ◽  
Nitrate Solutions ◽  
Ray Scattering

Aluminium hydroxide particles, created by hydrolysis of aluminium nitrate solutions with sodium carbonate, aggregate rapidly to form mass fractal structures for which the fractal dimension varies from 1.7 to 2.1 depending on the OH/Al-ion ratio of the solution. This system has been studied by small-angle X-ray scattering (SAXS). The OH/Al ratios for the solutions were 1.5, 2.0 and 2.15. The maximum radius of gyration of the aggregates of about 50 Å is found in the solutions having the highest OH/Al ratio. SAXS measurements made at various stages of the aging process show that, in addition to fractal aggregation, there is a second process active in the solutions that leads to the break up of the fractal structure and formation of nonfractal particles, which are probably Al13 ions, [AlO4Al12(OH)24(OH2)12]7+. This process, which is strongly temperature dependent, is governed by an activation energy of approximately 162 kJ mol−1.

A Revised O2 Reduction Model in Li-O2 Batteries as Revealed by in Situ Small Angle X-Ray Scattering

2019 ◽  
Author(s):  
Christian Prehal ◽  
Aleksej Samojlov ◽  
Manfred Nachtnebel ◽  
Manfred Kriechbaum ◽  
Heinz Amenitsch ◽  
...  
Keyword(s):  
Small Angle ◽  
Wide Angle ◽  
Reduction Mechanism ◽  
Reduction Model ◽  
X Ray ◽  
X Ray Scattering ◽  
O2 Reduction ◽  
Ray Scattering

<b>Here we use in situ small and wide angle X-ray scattering to elucidate unexpected mechanistic insights of the O2 reduction mechanism in Li-O2 batteries.<br></b>

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