Chain scission by ultrasonication of polycaprolactone with different initial molecular weight and concentration

Ultrasonication-mediated scission of three commercially available polycaprolactone (PCL) with different initial molecular weights (designated as low-, intermediate- and high-IMW PCL) was investigated. Each IMW PCL solution at different concentrations were subjected to sonication intervals. Scission-...

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Bibliographic Details
Published in:Journal of polymer research 2022-04, Vol.29 (4), Article 134
Main Authors: Ishak, Khairul Anwar, Annuar, Mohamad Suffian Mohamad, Aris, Muhammad Haziq
Format: Article
Language:English
Subjects:
Chain scission
Chains
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Constraining
Energy dissipation
Industrial Chemistry/Chemical Engineering
Molecular weight
Original Paper
Polycaprolactone
Polydispersity
Polymer Sciences
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Summary:Ultrasonication-mediated scission of three commercially available polycaprolactone (PCL) with different initial molecular weights (designated as low-, intermediate- and high-IMW PCL) was investigated. Each IMW PCL solution at different concentrations were subjected to sonication intervals. Scission-induced molecular size reduction, polydispersity index alteration, and a limiting molecular weight of the sonicated PCL samples depend on their initial molecular weight and effective concentration, whereby interaction forces play an important role. ε -caprolactone was identified post-scission event. It is hypothesized that a single scission event occurs at the upward/downward vicinity to the mid-point of the chain involving unzipping mechanism, driven by known forces associated with sonication energy dissipation. Further scission event of the generated fragment is no longer feasible below a limiting molecular weight for the designated IMW PCL.
ISSN:1022-9760
1572-8935
DOI:10.1007/s10965-022-02982-y