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Molecular dynamics study of polymeric chemical gels: Effect of persistence length and crosslinker density
Journal of polymer science. Part B, Polymer physics, 2019-10, Vol.57 (19), p.1343-1350
Pereyra, Rodolfo G.
Carignano, Marcelo A.
2019
Details
Autor(en) / Beteiligte
Pereyra, Rodolfo G.
Carignano, Marcelo A.
Titel
Molecular dynamics study of polymeric chemical gels: Effect of persistence length and crosslinker density
Ist Teil von
Journal of polymer science. Part B, Polymer physics, 2019-10, Vol.57 (19), p.1343-1350
Ort / Verlag
Hoboken, USA: John Wiley & Sons, Inc
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
ABSTRACT Using molecular dynamics, we study the formation of chemical gels from an initial solution of reactive polymers that undergo a crosslinking reaction. We study the effect of the polymer persistence length and different densities of crosslinkers along the chains. As the reaction progresses, different structural features are identified in the system leading to the development of a percolated cluster. These features are (a) single strands, (b) double strands, and (c) bridges. We found that the total numbers of these three kinds of features are roughly independent of the persistence length; however, the average lengths of single and double strands grow with this variable. The average length of double strands strongly increases with increasing crosslinker density and the amount of single strands sharply falls as crosslinker density grows. We also found that general structural features of polymer networks are highly dependent on chain persistence length and crosslinker density. Fully flexible chains with high density of crosslinkers result in inhomogeneous network structures with large voids. In contrast, precursor chains with high rigidity and scarce number of crosslinkers result in homogeneous networks having small cavities. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 1343–1350 A solution of linear polymer molecules undergoes a crosslinking chemical reaction process to form a chemical gel. The relationship between the gel mesh size with the polymer persistence length and the density of crosslinkers is studied using molecular dynamics simulations. The structures are classified in terms of single and double strands and bridges.
Sprache
Englisch
Identifikatoren
ISSN: 0887-6266
eISSN: 1099-0488
DOI: 10.1002/polb.24882
Titel-ID: cdi_proquest_journals_2303472872
Format
–
Schlagworte
chain flexibility
,
crosslinker density
,
Crosslinking
,
Density
,
gelation
,
Gels
,
Molecular dynamics
,
Organic chemistry
,
persistence length
,
polymer networks
,
polymeric chemical gels
,
Polymers
,
Strands
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