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

scholarly journals Interplay of entanglement and association effects on the dynamics of semidilute solutions of multisticker polymer chains

2017 ◽  
Vol 61 (6) ◽  
pp. 1231-1241 ◽  
Author(s):  
Maksim E. Shivokhin ◽  
Tetsuharu Narita ◽  
Laurence Talini ◽  
Axel Habicht ◽  
Sebastian Seiffert ◽  
...  
Keyword(s):  
Polymer Chains ◽  
Semidilute Solutions

Dimensions of Polymer Chains in Critical Semidilute Solutions

1997 ◽  
Vol 78 (4) ◽  
pp. 686-688 ◽  
Author(s):  
Yu. B. Melnichenko ◽  
G. D. Wignall
Keyword(s):  
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.

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