Improving Mechanoluminescent Sensitivity of 1,2-Dioxetane-Containing Thermoplastic Polyurethanes by Controlling Energy Transfer across Polymer Chains

2018 ◽  
Vol 51 (21) ◽  
pp. 9019-9025 ◽  
Author(s):  
Wei Yuan ◽  
Yuan Yuan ◽  
Fan Yang ◽  
Mengjiao Wu ◽  
Yulan Chen
Keyword(s):  
Energy Transfer ◽  
Polymer Chains ◽  
Thermoplastic Polyurethanes

Energy Transfer in Labeled Polymer Chains in Semidilute Solutions

1977 ◽  
Vol 10 (4) ◽  
pp. 862-864 ◽  
Author(s):  
I. Ohmine ◽  
R. Silbey ◽  
J. M. Deutch
Keyword(s):  
Energy Transfer ◽  
Polymer Chains ◽  
Semidilute Solutions

Photophysical studies of hydrophobically functionalized polyionene systems in aqueous solutions

1995 ◽  
Vol 73 (11) ◽  
pp. 2041-2046 ◽  
Author(s):  
P. Uznanski ◽  
J. Pecherz ◽  
M. Kryszewski
Keyword(s):  
Energy Transfer ◽  
Conformational Changes ◽  
Hydrophobic Interaction ◽  
Polymer Chains ◽  
Anionic Dyes ◽  
Fluorescence Studies ◽  
Surfactant Aggregates ◽  
Modified Polymers ◽  
Characteristic Behaviour ◽  
Polymer Surfactant

Complexes of polyionene and anionic dyes and surfactant were prepared by exchange reaction of counterions in the parent polymer. Fluorescence studies were conducted to observe some characteristic behaviour of these complexes in water Polyionenes with aromatic hydrocarbons adopt an open conformation and there is no evidence for interpolymer interactions. On the contrary, polyionenes with long aliphatic counterions easily form microdomains in aqueous solution due to hydrophobic interaction as evidenced by an increase in excimer emission. Microdomains have an interpolymer nature, as confirmed by measurements of energy transfer from naphthalene to pyrene moieties. Polyionenes with SDS counterions interact with external surfactant molecules and form polymer–surfactant aggregates. Electrostatic repulsions between aggregates dominate on hydrophobic interaction between polymer chains and are responsible for conformational changes. Keywords: hydrophobically modified polymers, surfactants, complexation, fluorescence, nonradiative energy transfer

scholarly journals Conformational Transitions of Polymer Chains in Solutions Characterized by Fluorescence Resonance Energy Transfer

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1007 ◽  
Author(s):  
Linlin Qin ◽  
Linling Li ◽  
Ye Sha ◽  
Ziyu Wang ◽  
Dongshan Zhou ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Resonance Energy Transfer ◽  
Conformational Changes ◽  
Conformational Transition ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Polymer Chains ◽  
Donor And Acceptor ◽  
Transition Concentration ◽  
Fluorescence Resonance

The critical overlap concentration C* is an important concept in polymer solutions and is defined as the boundary between dilute and semidilute regimes. In this study, the chain conformational changes of polystyrene (PS) with both high (Mn = 200,000 Da) and low (Mn = 13,000 Da) molecular weights in cis-decalin were compared by intrachain fluorescence resonance energy transfer (FRET). The random labeling of donor and acceptor chromophores strategy was employed for long PS chains, whereas chain-end labeling was used for short PS chains. By monitoring the spectroscopic intensity ratio between acceptor and donor, the concentration dependence on chain conformation from dilute to semidilute solutions was determined. Both long and short chains exhibit a conformational transition concentration, above which the polymer chains begin to collapse with concentration significantly. Interestingly, for randomly labeled polymer long chains, such concentration is consistent with C* determined from the viscosity result, below which only slight conformational change of polymer chain takes place. However, for the chain-end labeled short chain, the conformational transition concentration takes place earlier than C*, below which no significant polymer conformation change is observed.

scholarly journals FRET Measurement of Polymer Response under Shear

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 8033
Author(s):  
Ryo Iwao ◽  
Hiroki Yamaguchi ◽  
Makoto Obata ◽  
Yu Matsuda
Keyword(s):  
Energy Transfer ◽  
Shear Flow ◽  
Fluorescence Intensity ◽  
Time Variation ◽  
Diagnostic Method ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Polymer Chains ◽  
Manufacturing Processes ◽  
Spring Model

Polymer solutions under shear flow are often observed in manufacturing processes. Classically, polymer behavior is represented by Kuhn’s bead-spring model, in which only the elongation of polymer chains is assumed. In recent years, the compression of polymer chains under shear flow has been reported. In this study, we investigated the behavior of polymer chains dissolved in various concentrations under shear flow. We measured the time variation of the fluorescence intensity emitted from a FRET (fluorescence resonance energy transfer) polymer, which enabled us to study the change in the distance between both ends of a polymer chain. The polymer chains appeared to stretch and compress depending on the concentration of the polymer solution. The results showed that the deformation of polymer chains was different from the classical theory. The FRET measurement is a promising diagnostic method for understanding the dynamics of polymer chains.

Fluorescence Blinking, Exciton Dynamics, and Energy Transfer Domains in Single Conjugated Polymer Chains

2008 ◽  
Vol 130 (22) ◽  
pp. 7042-7051 ◽  
Author(s):  
Hongzhen Lin ◽  
Seyed R. Tabaei ◽  
Daniel Thomsson ◽  
Oleg Mirzov ◽  
Per-Olof Larsson ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymer ◽  
Polymer Chains ◽  
Exciton Dynamics ◽  
Conjugated Polymer Chains ◽  
Fluorescence Blinking

Direct energy transfer in solutions of ideal polymer chains

1995 ◽  
Vol 103 (22) ◽  
pp. 9864-9875 ◽  
Author(s):  
G. Oshanin ◽  
A. Blumen ◽  
M. Moreau ◽  
S. F. Burlatsky
Keyword(s):  
Energy Transfer ◽  
Polymer Chains ◽  
Direct Energy ◽  
Direct Energy Transfer
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