scholarly journals Tailoring the Diameters of Electro-Mechanically Spun Fibers by Controlling Their Deborah Numbers

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1358 ◽  
Author(s):  
Domingo R. Flores-Hernandez ◽  
Braulio Cardenas-Benitez ◽  
Sergio O. Martinez-Chapa ◽  
Jaime Bonilla-Rios
Keyword(s):  
Ethylene Glycol ◽  
Polymer Solution ◽  
Polymer Solutions ◽  
Low Voltage ◽  
Near Field ◽  
Operating Conditions ◽  
Poly Ethylene Glycol ◽  
Tetrabutyl Ammonium ◽  
Poly Ethylene ◽  
Spun Fibers

Polymer solutions with different concentrations of SU-8 2002/poly(ethylene) glycol/tetrabutyl ammonium tetrafluoroborate (SU-8/PEO/TBATFB) were electrospun in a low-voltage near-field electrospinning platform (LVNFES) at different velocities. Their diameters were related to the concentration contents as well as to their Deborah (De) numbers, which describes the elasticity of the polymer solution under determined operating conditions. We found a direct correlation between the concentration of PEO/TBATFB, the De and the diameter of the fibers. Fibers with diameters as thin as 465 nm can be achieved for De ≈ 1.

Molar mass fractionation in aqueous two-phase polymer solutions of dextran and poly(ethylene glycol)

2016 ◽  
Vol 1452 ◽  
pp. 107-115 ◽  
Author(s):  
Ziliang Zhao ◽  
Qi Li ◽  
Xiangling Ji ◽  
Rumiana Dimova ◽  
Reinhard Lipowsky ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Molar Mass ◽  
Polymer Solutions ◽  
Poly Ethylene Glycol ◽  
Two Phase ◽  
Mass Fractionation ◽  
Poly Ethylene

Thermodynamic properties of aqueous polymer solutions: poly(ethylene glycol)/dextran

1989 ◽  
Vol 93 (14) ◽  
pp. 5612-5617 ◽  
Author(s):  
C. A. Haynes ◽  
R. A. Beynon ◽  
R. S. King ◽  
H. W. Blanch ◽  
J. M. Prausnitz
Keyword(s):  
Thermodynamic Properties ◽  
Ethylene Glycol ◽  
Polymer Solutions ◽  
Poly Ethylene Glycol ◽  
Aqueous Polymer ◽  
Poly Ethylene

Phase separation in binary polymer solution: Gelatin/Poly(ethylene glycol) system

2014 ◽  
Vol 200 ◽  
pp. 2-6 ◽  
Author(s):  
Miho Yanagisawa ◽  
Yutaro Yamashita ◽  
Sada-atsu Mukai ◽  
Masahiko Annaka ◽  
Masayuki Tokita
Keyword(s):  
Phase Separation ◽  
Ethylene Glycol ◽  
Polymer Solution ◽  
Poly Ethylene Glycol ◽  
Binary Polymer ◽  
Poly Ethylene

Origin of the low-frequency plateau and the light-scattering slow mode in semidilute poly(ethylene glycol) solutions

Soft Matter ◽  
2019 ◽  
Vol 15 (12) ◽  
pp. 2666-2676 ◽  
Author(s):  
Martha Koziol ◽  
Karl Fischer ◽  
Sebastian Seiffert
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Ethylene Glycol ◽  
Autocorrelation Function ◽  
Phase Angle ◽  
Polymer Solutions ◽  
Low Frequency ◽  
Slow Mode ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

The low-frequency plateau often found in the rheological spectra of semidilute polymer solutions is shown to be an artifact due to imprecise phase-angle determination; furthermore, the slow mode in the dynamic light scattering autocorrelation function of such solutions is shown to result from minor fractions of 20–200 nm sized impurities.

scholarly journals Alpha-beta transition induced by C18-conjugation of polyalanine and its implication in aqueous solution behavior of poly(ethylene glycol)-polyalanine block copolymers

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
Min Hee Park ◽  
Jinkyung Park ◽  
Hyun Jung Lee ◽  
Byeongmoon Jeong
Keyword(s):  
Aqueous Solution ◽  
Block Copolymers ◽  
Ethylene Glycol ◽  
Polymer Solutions ◽  
Poly Ethylene Glycol ◽  
Solution Behavior ◽  
Aqueous Polymer ◽  
Poly Ethylene ◽  
Α Helix ◽  
Β Sheet

Abstract Background The aqueous solution behavior of thermosensitive PEG-PA block copolymers as well as secondary structure of PA is expected to significantly change through modification of the hydrophobic PA by long chain alkyl (C18) groups with different configurations. Method Oleoyl and stearoyl (C18) groups were conjugated to poly(ethylene glycol)-poly(L-alanine) (PEG-PA; EG45A16) diblock copolymers to compare their conjugation effect on nano-assemblies and corresponding aqueous solution behavior of the polymers. Results Due to the nature of a hydrophilic PEG block and a hydrophobic PA or C18-modified PA, PEG-PA, oleoyl group-conjugated PEG-PA (PEG-PAO), and stearoyl group-conjugated PEG-PA (PEG-PAS) block copolymers form micelles in water. Compared with PEG-PA, the micelle size of PEG-PAO and PEG-PAS increased. Circular dichroism and FTIR spectra of aqueous polymer solutions showed that β sheet content increased, whereas α helix content decreased by C18 modification of PEG-PA. PEG-PAS showed better performance in ice crystallization inhibition than PEG-PAO. The sol-to-gel transition temperatures of aqueous PEG-PAO solutions were 25–37 °C higher than those of aqueous PEG-PA solutions, whereas aqueous PEG-PAS solutions remained as gels in the temperature range of 0–80 °C. 1H-NMR spectra indicated that the oleoyl groups increased core mobility, whereas stearoyl groups decreased the core mobility of the micelles in water. The difference in micromobility between PAO and PAS interfered or promoted gelation of the aqueous polymer solutions, respectively. Conclusions This study suggests that a hydrophobic C18-modification of polypeptide induces α helix-to-β sheet transition of the polypeptide; however, aqueous solution behaviors including ice recrystallization inhibition and gelation are significantly affected by the nature of the hydrophobic molecule. Graphical abstract

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