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Polymers
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Luminescent Polymers from Theory to Application
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Luminescent Polymers from Theory to Application

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Physics and Theory".

Deadline for manuscript submissions: closed (20 April 2021) | Viewed by 3215

Special Issue Editor

Prof. Dr. José Manuel Gaspar Martinho

E-Mail Website
Guest Editor
Centro de Quimica Estrutural, Department of Chemical Engineering, Instituto Superior Tecnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
Interests: polymers; colloids; hybrid materials; optical microscopy; biphotonic absorption; photophysic; photochemistry
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Special Issue Information

Dear Colleagues,

This Special Issue is devoted to a very interesting class of polymers, luminescent polymers. Polymers can be intrinsically luminescent or become luminescent by dye-labeling at specific chain points. In this issue, we call for manuscripts dealing with both intrinsically luminescent polymers (for use in photovoltaic devices) and dye-labeled polymers (to characterize chain dynamics and polymer-polymer interactions, based on luminescence quenching, Förster resonance energy transfer or excimer formation). Applications of luminescent polymers in sensing and imaging, with an emphasis in biological media, are also welcome.

Prof. Dr. José Manuel Gaspar Martinho
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

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Published Papers (1 paper)

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Research

12 pages, 2227 KiB  
Article
Unfolding of Helical Poly(L-Glutamic Acid) in N,N-Dimethylformamide Probed by Pyrene Excimer Fluorescence (PEF)
by Weize Yuan, Remi Casier and Jean Duhamel
Polymers 2021, 13(11), 1690; https://doi.org/10.3390/polym13111690 - 22 May 2021
Cited by 1 | Viewed by 2384
Abstract
The denaturation undergone by α–helical poly(L-glutamic acid) (PLGA) in N,N-dimethylformamide upon addition of guanidine hydrochloride (GdHCl) was characterized by comparing the fluorescence of a series of PLGA constructs randomly labeled with the dye pyrene [...] Read more.
The denaturation undergone by α–helical poly(L-glutamic acid) (PLGA) in N,N-dimethylformamide upon addition of guanidine hydrochloride (GdHCl) was characterized by comparing the fluorescence of a series of PLGA constructs randomly labeled with the dye pyrene (Py-PLGA) to that of a series of Py-PDLGA samples prepared from a racemic mixture of D,L-glutamic acid. The process of pyrene excimer formation (PEF) was taken advantage of to probe changes in the conformation of α–helical Py-PLGA. Fluorescence Blob Model (FBM) analysis of the fluorescence decays of the Py-PLGA and Py-PDLGA constructs yielded the average number (<Nblob>) of glutamic acids located inside a blob, which represented the volume probed by an excited pyrenyl label. <Nblob> remained constant for randomly coiled Py-PDLGA but decreased from ~20 to ~10 glutamic acids for the Py-PLGA samples as GdHCl was added to the solution. The decrease in <Nblob> reflected the decrease in the local density of PLGA as the α–helix unraveled in solution. The changes in <Nblob> with GdHCl concentration was used to determine the change in Gibbs energy required to denature the PLGA α–helix in DMF. The relationship between <Nblob> and the local density of macromolecules can now be applied to characterize the conformation of macromolecules in solution. Full article
(This article belongs to the Special Issue Luminescent Polymers from Theory to Application)
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