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 journalArticle

Abstract

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
Volume137
DOIs
Publication statusPublished - 2019 Dec 1

Fingerprint

Composite films
Polymer films
Polymers
Mechanical properties
Transparency
Hardness
Siloxanes
Ladders
Silicones
Aspect ratio
Physical properties
Elastic moduli
Coatings

Keywords

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

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Surfaces, Coatings and Films
  • Organic Chemistry
  • Materials Chemistry

Cite this

Effect of the silsesquioxane structure on the mechanical properties of the silsesquioxane-reinforced polymer composite films. / Hwang, Seon Oh; Lee, Ju Yeon; Lee, Jung-hyun.

In: Progress in Organic Coatings, Vol. 137, 105316, 01.12.2019.

Research output: Contribution to journalArticle

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