Effect of the silsesquioxane structure on the mechanical properties of the silsesquioxane-reinforced polymer composite films

Seon Oh Hwang, Ju Yeon Lee, Jung Hyun Lee

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


As additives for reinforcing the physical properties of polymer coating materials, silicone-based silsesquioxanes (SQs) have received considerable attention owing to their excellent mechanical and thermal robustness. To understand the effect of the SQ structure on the mechanical properties of SQ-reinforced polymer composite films, a series of SQs with different siloxane structures, i.e., randomly branched SQ (RSQ), cage-like SQ (POSS) and ladder-like SQs (LPSQs), were incorporated into the poly(urethane acrylate) (PUA) polymer. Regardless of the SQ structure and loading, all the SQ-reinforced PUA (SQ-PUA) composite films exhibited excellent optical transparency and high colorlessness. Moreover, the incorporation of the SQs increased the hardness and scratch resistance, but decreased the elastic modulus of the PUA film for all the SQs due to the strong and compliant nature of the SQ network. Importantly, at the same SQ loading, the SQ-PUA films exhibited the increasing hardness, scratch resistance and modulus in the order of RSQ < POSS < LPSQ (4 K) < LPSQ (7 K). The results suggested that the highly ordered and one-dimensional LPSQ with a higher aspect ratio is desirable for effectively reinforcing the mechanical properties of polymers with guaranteeing their excellent optical transparency.

Original languageEnglish
Article number105316
JournalProgress in Organic Coatings
Publication statusPublished - 2019 Dec

Bibliographical note

Funding Information:
This research was supported by the KCC Corporation (South Korea) research fund and the National Research Foundation of Korea (NRF) grant funded by the Korean government ( NRF-2018R1A4A1022194 , 2019R1A2C1002333 and 2019M3E6A1064103 ).

Publisher Copyright:
© 2019 Elsevier B.V.

Copyright 2019 Elsevier B.V., All rights reserved.


  • Composites
  • Hard coatings
  • Mechanical properties
  • Poly(urethane acrylate)
  • Silsesquioxanes

ASJC Scopus subject areas

  • General Chemical Engineering
  • Surfaces, Coatings and Films
  • Organic Chemistry
  • Materials Chemistry


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