Sum Frequency Generation Vibrational Spectroscopy Studies on Molecular Conformation of Liquid Polymers Poly(ethylene glycol) and Poly(propylene glycol) at Different Interfaces

2002 ◽  
Vol 35 (24) ◽  
pp. 9130-9135 ◽  
Author(s):  
Chun-yan Chen ◽  
Mark A. Even ◽  
Jie Wang ◽  
Zhan Chen
Keyword(s):  
Ethylene Glycol ◽  
Propylene Glycol ◽  
Vibrational Spectroscopy ◽  
Molecular Conformation ◽  
Poly Ethylene Glycol ◽  
Sum Frequency ◽  
Liquid Polymers ◽  
Poly Ethylene ◽  
Spectroscopy Studies ◽  
Poly Propylene

Detection of Interfacial Structures of Poly(ethylene glycol), Poly(propylene glycol) and Their Copolymers at Liquid/Solid Interfaces Using Sum Frequency Generation Vibrational Spectroscopy

2003 ◽  
Vol 790 ◽  
Author(s):  
Chunyan Chen ◽  
Jie Wang ◽  
Mark A. Even ◽  
Zhan Chen
Keyword(s):  
Ethylene Glycol ◽  
Vibrational Spectroscopy ◽  
Molecular Level ◽  
Fused Silica ◽  
Methyl Groups ◽  
Poly Ethylene Glycol ◽  
Sum Frequency ◽  
Interfacial Structures ◽  
Poly Ethylene ◽  
Poly Propylene

ABSTRACTWe have applied sum frequency generation (SFG) vibrational spectroscopy, a submonolayer surface sensitive analytical technique, to study interfacial structures of poly (ethylene glycol) (PEG), poly (propylene glycol) (PPG), their solutions, their copolymers, and copolymer solutions while contacting different media including air, fused silica, and various polymers.For the first time, conformations of polyether materials at various interfaces have been shown at the molecular level in situ. Depending on the hydrophobicity of the solid contacting media, the liquid polymers PEG and PPG show different conformations at different interfaces, which can be correlated to molecular interactions at these interfaces. The favorable interaction between hydrophobic media and the hydrophobic segments, methylene or methyl groups, of polyethers causes an ordered conformation with these groups standing up at the interface. The unfavorable interaction between hydrophilic media and hydrophobic segments of the polyethers induces interfacial methylene or methyl groups to have a random structure or to lie down at the interfaces, indicated by the weakening or even absence of SFG signals. For comparison, interfaces between aqueous PEG or PPG solutions and air, polystyrene (PS), poly(methyl methacrylate) (PMMA), and fused silica have also been investigated. In addition, we have studied conformations of pluronics at various interfaces, showing that different blocks have different interface activities. The interfaces are always dominated by the PPG segments. The studies on molecular level interfacial structures of PEG, PPG and pluronics will help us to understand and control the interfacial behavior of liquids at interfaces.

A chitosan/poly(ethylene glycol)-ran-poly(propylene glycol) blend as an eco-benign separator and binder for quasi-solid-state supercapacitor applications

2019 ◽  
Vol 3 (3) ◽  
pp. 760-773 ◽  
Author(s):  
M. Raja ◽  
Balaji Sadhasivam ◽  
Janraj Naik R ◽  
Dhamodharan R ◽  
Kothandaraman Ramanujam
Keyword(s):  
Activated Carbon ◽  
Solid State ◽  
Ethylene Glycol ◽  
Propylene Glycol ◽  
Tamarindus Indica ◽  
Poly Ethylene Glycol ◽  
Active Electrode ◽  
Poly Ethylene ◽  
Poly Propylene ◽  
Supercapacitor Applications

In this study chitosan/poly(ethylene glycol)-ran-poly(propylene glycol) blend was developed as separator and binder for supercapacitor (SC) applications. The activated carbon (ACTS-900) derived fromTamarindus indicaseeds is used as active electrode material.

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