Thermodynamic study of poly(ethylene glycol) in water/acetone solutions by viscometry

2011 ◽  
Vol 31 (5) ◽  
Author(s):  
Abbas Mehrdad ◽  
Mohammad Taghi Taghizadeh ◽  
Roghieh Moladoust
Keyword(s):  
Ethylene Glycol ◽  
Polymer Chains ◽  
Viscosity Data ◽  
Poly Ethylene Glycol ◽  
Solvent Interaction ◽  
Solvent Interactions ◽  
Volume Fractions ◽  
Poly Ethylene ◽  
Increasing Temperature ◽  
Mixed Water

Abstract In this work, the intrinsic viscosities of poly(ethylene glycol) (PEG) with a molar mass of 20,000 g·mol-1 were measured in water/acetone solutions from (283.1 to 313.1) K. The expansion factors of the polymer chains were calculated from the intrinsic viscosity data. The thermodynamic para­meters (entropy of dilution parameter, the heat of dilution para­meter, θ temperature, polymer-solvent interaction parameter and second osmotic virial coefficient) were derived by the temperature dependence of the polymer chain expansion factor. The thermodynamic parameters indicate that mixtures of water/acetone are changed to the poorer solvents for PEG, by increasing temperature and volume fractions of acetone. Also, the temperature dependency of segment-segment and segment-solvent interactions for PEG in mixed water/acetone, is decreased by increasing volume fractions of acetone.

scholarly journals Studies on Chemical IR Images of Poly(hydroxybutyrate–co–hydroxyhexanoate)/Poly(ethylene glycol) Blends and Two-Dimensional Correlation Spectroscopy

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 507 ◽  
Author(s):  
Yeonju Park ◽  
Sila Jin ◽  
Yujeong Park ◽  
Soo Kim ◽  
Isao Noda ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Ethylene Glycol ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Poly Ethylene Glycol ◽  
Biodegradable Poly ◽  
Poly Ethylene ◽  
Increasing Temperature ◽  
Kinetics Of

Biodegradable poly-[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoates] (PHBHx) have been widely studied for their applications in potentially replacing petroleum-based thermoplastics. In this study, the effect of the high molecular weight (Mn = 3400) poly(ethylene glycol) (PEG) blended in the films of PHBHx with different ratios of PEG was investigated using chemical FTIR imaging. Chemical IR images and FTIR spectra measured with increasing temperature revealed that PEG plays an important role in changing the kinetics of PHBHx crystallization. In addition, two-dimensional correlation spectra clearly showed that thermal properties of PHBHx/PEG blend film changed when the blending ratio of PHBHx/PEG were 60/40 and 50/50. Consequently, PEG leads to changes in the thermal behavior of PHBHx copolymers.

Hydration Parameters of Aqueous Solutions of Poly(Ethylene Glycol)s by Viscosity Data

2002 ◽  
Vol 66 (2) ◽  
pp. 175-179 ◽  
Author(s):  
C Branca ◽  
S Magazù ◽  
G Maisano ◽  
P Migliardo ◽  
F Migliardo ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Aqueous Solutions ◽  
Viscosity Data ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

scholarly journals Surfactant-free emulsion polymerization of vinylidene fluoride mediated by RAFT/MADIX reactive poly(ethylene glycol) polymer chains

2021 ◽  
Author(s):  
Mathieu Fuentes Exposito ◽  
Sébastien Norsic ◽  
Thibaut Février ◽  
Pierre-Yves Dugas ◽  
Salima Boutti ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Emulsion Polymerization ◽  
Vinylidene Fluoride ◽  
Polymer Chains ◽  
Poly Ethylene Glycol ◽  
Poly Vinylidene Fluoride ◽  
Emulsion Polymerizations ◽  
Poly Ethylene

A robust and straightforward synthesis of surfactant-free poly(vinylidene fluoride) (PVDF) latexes is presented using RAFT/MADIX-mediated emulsion polymerization. VDF emulsion polymerizations were conducted in the presence of commercial poly(ethylene glycol) chains...

Poly(ethylene glycol)-Grafted Liposomes with Oligopeptide or Oligosaccharide Ligands Appended to the Termini of the Polymer Chains

1997 ◽  
Vol 8 (2) ◽  
pp. 111-118 ◽  
Author(s):  
Samuel Zalipsky ◽  
Nasreen Mullah ◽  
Jennifer A. Harding ◽  
Joshua Gittelman ◽  
Luke Guo ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Polymer Chains ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

Semipermeable poly(ethylene glycol) films: the relationship between permeability and molecular structure of polymer chains

Soft Matter ◽  
2009 ◽  
Vol 5 (21) ◽  
pp. 4104 ◽  
Author(s):  
Robert Schlapak ◽  
Daren Caruana ◽  
David Armitage ◽  
Stefan Howorka
Keyword(s):  
Molecular Structure ◽  
Ethylene Glycol ◽  
Polymer Chains ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
The Relationship

scholarly journals Photocontrolled Radical Polymerization from Hydridic C–H Bonds

2019 ◽  
Author(s):  
Erin Stache ◽  
Veronika Kottisch ◽  
Brett Fors
Keyword(s):  
Hydrogen Atom ◽  
Ethylene Glycol ◽  
Polymer Chains ◽  
Hydrogen Atom Abstraction ◽  
Graft Polymer ◽  
Poly Ethylene Glycol ◽  
Controlled Polymerization ◽  
Poly Ethylene ◽  
Grafting From ◽  
Powerful Strategy

<p>Given the ubiquity of C–H bonds in biomolecules and polymer backbones, the development of a photocontrolled polymerization from a C–H bond would represent a powerful strategy for selective polymer conjugation precluding several synthetic steps to introduce complex functionality. We have developed a hydrogen-atom abstraction strategy that allows for a controlled polymerization from a C­–H bond using a benzophenone photocatalyst, a trithiocarbonate-derived disulfide, and visible light. We perform the polymerization from a variety of ethers, alkanes, unactivated C–H bonds, and alcohols as well as showcase the applicability of the method to several monomer classes. Our method lends itself to photocontrol which has important implications for building advanced macromolecular architectures. Finally, we demonstrate that we can graft polymer chains controllably from poly(ethylene glycol) showcasing the potential application of this method for controlled grafting from C–H bonds of commodity polymers.</p>

scholarly journals Miscibility Studies of Hydroxypropyl Cellulose/Poly(Ethylene Glycol) in Dilute Solutions and Solid State

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
K. Sudharsan Reddy ◽  
M. N. Prabhakar ◽  
P. Kumara Babu ◽  
G. Venkatesulu ◽  
U. Sajan Kumarji Rao ◽  
...  
Keyword(s):  
Refractive Index ◽  
Ethylene Glycol ◽  
Ultrasonic Velocity ◽  
Analytical Techniques ◽  
Hydroxypropyl Cellulose ◽  
Hydroxyl Groups ◽  
Viscosity Data ◽  
Poly Ethylene Glycol ◽  
Solution Casting Method ◽  
Poly Ethylene

The miscibility of Hydroxypropyl cellulose (HPC)/poly(ethylene glycol) (PEG) blends over an extended range of concentrations in water. The viscosity, ultrasonic velocity, and refractive index of the above blend solutions have been measured at 30°C. The interaction parameters such as and μ proposed by Chee and α proposed by Sun have been obtained using the viscosity data to probe the miscibility of the polymer blends. The values indicated that the blends were miscible when HPC content is more than 40% in the blend. The obtained results have been confirmed by the ultrasonic velocity and refractive index studies. The films of the blends were prepared by solution casting method using water as a solvent. The prepared films have been characterized by analytical techniques such as FTIR, DSC, X-RD, and SEM to probe the miscibility of HPC/PEG blends. The compatibility in the above compositions may be due to the formation of H-bonding between hydroxyl groups of HPC and etheric oxygen atom of PEG molecules.

scholarly journals Photocontrolled Radical Polymerization from Hydridic C–H Bonds

2019 ◽  
Author(s):  
Erin Stache ◽  
Veronika Kottisch ◽  
Brett Fors
Keyword(s):  
Hydrogen Atom ◽  
Ethylene Glycol ◽  
Polymer Chains ◽  
Hydrogen Atom Abstraction ◽  
Graft Polymer ◽  
Poly Ethylene Glycol ◽  
Controlled Polymerization ◽  
Poly Ethylene ◽  
Grafting From ◽  
Powerful Strategy

<p>Given the ubiquity of C–H bonds in biomolecules and polymer backbones, the development of a photocontrolled polymerization from a C–H bond would represent a powerful strategy for selective polymer conjugation precluding several synthetic steps to introduce complex functionality. We have developed a hydrogen-atom abstraction strategy that allows for a controlled polymerization from a C­–H bond using a benzophenone photocatalyst, a trithiocarbonate-derived disulfide, and visible light. We perform the polymerization from a variety of ethers, alkanes, unactivated C–H bonds, and alcohols as well as showcase the applicability of the method to several monomer classes. Our method lends itself to photocontrol which has important implications for building advanced macromolecular architectures. Finally, we demonstrate that we can graft polymer chains controllably from poly(ethylene glycol) showcasing the potential application of this method for controlled grafting from C–H bonds of commodity polymers.</p>

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