Mechanical properties of ladder-like polysilsesquioxane-based hard coating films containing different organic functional groups

Seon Oh Hwang, Albert S. Lee, Ju Yeon Lee, Sang Hee Park, Kevin Injoe Jung, Hyun Wook Jung, Jung-hyun Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A series of ladder-like polysilsesquioxanes (LPSQs) containing the UV-curable methacryoxypropyl (MA) and different organic functional (R) groups (propyl, hexyl, cyclohexyl, phenyl or naphthyl) at the fixed MA/R molar ratio were synthesized as hard coating materials. The LPSQ hard coating films prepared by a simple UV curing process exhibited excellent optical transparency in the visible light range. X-ray diffraction analysis of the LPSQ films characterized how their intermolecular chain-to-chain distance and thus chain packing density varied according to the organic functional group. In addition, the hardness, elastic modulus and scratch resistance of the LPSQ films were evaluated by nanoindentation and nanoscratch tests. Although the mechanical properties of the LPSQ films were affected by both the chain rigidity of the organic functional group and the chain packing density of the siloxane backbones, chain rigidity played the dominant role in determining their mechanical robustness. Hence, despite its lowest chain packing density, the LPSQ film with the naphthyl group exhibited the best mechanical properties due to its high chain rigidity derived from the increased aromaticity of the naphthyl group. This study suggests the key factor when designing mechanically durable, scratch resistant hard coating films is the chain rigidity of the film network.

Original languageEnglish
Pages (from-to)105-111
Number of pages7
JournalProgress in Organic Coatings
Volume121
DOIs
Publication statusPublished - 2018 Aug 1

Fingerprint

Hard coatings
Ladders
Functional groups
Mechanical properties
Rigidity
Siloxanes
Nanoindentation
polysilsesquioxane
Transparency
X ray diffraction analysis
Curing
Elastic moduli
Hardness

Keywords

  • Hard coating films
  • Hybrid materials
  • Ladder-like polysilsesquioxanes
  • Mechanical properties
  • Scratch resistance
  • Silicone

ASJC Scopus subject areas

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

Cite this

Mechanical properties of ladder-like polysilsesquioxane-based hard coating films containing different organic functional groups. / Hwang, Seon Oh; Lee, Albert S.; Lee, Ju Yeon; Park, Sang Hee; Jung, Kevin Injoe; Jung, Hyun Wook; Lee, Jung-hyun.

In: Progress in Organic Coatings, Vol. 121, 01.08.2018, p. 105-111.

Research output: Contribution to journalArticle

@article{baea48c8fff9465c9eb2dfba06be3c5c,
title = "Mechanical properties of ladder-like polysilsesquioxane-based hard coating films containing different organic functional groups",
abstract = "A series of ladder-like polysilsesquioxanes (LPSQs) containing the UV-curable methacryoxypropyl (MA) and different organic functional (R) groups (propyl, hexyl, cyclohexyl, phenyl or naphthyl) at the fixed MA/R molar ratio were synthesized as hard coating materials. The LPSQ hard coating films prepared by a simple UV curing process exhibited excellent optical transparency in the visible light range. X-ray diffraction analysis of the LPSQ films characterized how their intermolecular chain-to-chain distance and thus chain packing density varied according to the organic functional group. In addition, the hardness, elastic modulus and scratch resistance of the LPSQ films were evaluated by nanoindentation and nanoscratch tests. Although the mechanical properties of the LPSQ films were affected by both the chain rigidity of the organic functional group and the chain packing density of the siloxane backbones, chain rigidity played the dominant role in determining their mechanical robustness. Hence, despite its lowest chain packing density, the LPSQ film with the naphthyl group exhibited the best mechanical properties due to its high chain rigidity derived from the increased aromaticity of the naphthyl group. This study suggests the key factor when designing mechanically durable, scratch resistant hard coating films is the chain rigidity of the film network.",
keywords = "Hard coating films, Hybrid materials, Ladder-like polysilsesquioxanes, Mechanical properties, Scratch resistance, Silicone",
author = "Hwang, {Seon Oh} and Lee, {Albert S.} and Lee, {Ju Yeon} and Park, {Sang Hee} and Jung, {Kevin Injoe} and Jung, {Hyun Wook} and Jung-hyun Lee",
year = "2018",
month = "8",
day = "1",
doi = "10.1016/j.porgcoat.2018.04.022",
language = "English",
volume = "121",
pages = "105--111",
journal = "Progress in Organic Coatings",
issn = "0300-9440",
publisher = "Elsevier",

}

TY - JOUR

T1 - Mechanical properties of ladder-like polysilsesquioxane-based hard coating films containing different organic functional groups

AU - Hwang, Seon Oh

AU - Lee, Albert S.

AU - Lee, Ju Yeon

AU - Park, Sang Hee

AU - Jung, Kevin Injoe

AU - Jung, Hyun Wook

AU - Lee, Jung-hyun

PY - 2018/8/1

Y1 - 2018/8/1

N2 - A series of ladder-like polysilsesquioxanes (LPSQs) containing the UV-curable methacryoxypropyl (MA) and different organic functional (R) groups (propyl, hexyl, cyclohexyl, phenyl or naphthyl) at the fixed MA/R molar ratio were synthesized as hard coating materials. The LPSQ hard coating films prepared by a simple UV curing process exhibited excellent optical transparency in the visible light range. X-ray diffraction analysis of the LPSQ films characterized how their intermolecular chain-to-chain distance and thus chain packing density varied according to the organic functional group. In addition, the hardness, elastic modulus and scratch resistance of the LPSQ films were evaluated by nanoindentation and nanoscratch tests. Although the mechanical properties of the LPSQ films were affected by both the chain rigidity of the organic functional group and the chain packing density of the siloxane backbones, chain rigidity played the dominant role in determining their mechanical robustness. Hence, despite its lowest chain packing density, the LPSQ film with the naphthyl group exhibited the best mechanical properties due to its high chain rigidity derived from the increased aromaticity of the naphthyl group. This study suggests the key factor when designing mechanically durable, scratch resistant hard coating films is the chain rigidity of the film network.

AB - A series of ladder-like polysilsesquioxanes (LPSQs) containing the UV-curable methacryoxypropyl (MA) and different organic functional (R) groups (propyl, hexyl, cyclohexyl, phenyl or naphthyl) at the fixed MA/R molar ratio were synthesized as hard coating materials. The LPSQ hard coating films prepared by a simple UV curing process exhibited excellent optical transparency in the visible light range. X-ray diffraction analysis of the LPSQ films characterized how their intermolecular chain-to-chain distance and thus chain packing density varied according to the organic functional group. In addition, the hardness, elastic modulus and scratch resistance of the LPSQ films were evaluated by nanoindentation and nanoscratch tests. Although the mechanical properties of the LPSQ films were affected by both the chain rigidity of the organic functional group and the chain packing density of the siloxane backbones, chain rigidity played the dominant role in determining their mechanical robustness. Hence, despite its lowest chain packing density, the LPSQ film with the naphthyl group exhibited the best mechanical properties due to its high chain rigidity derived from the increased aromaticity of the naphthyl group. This study suggests the key factor when designing mechanically durable, scratch resistant hard coating films is the chain rigidity of the film network.

KW - Hard coating films

KW - Hybrid materials

KW - Ladder-like polysilsesquioxanes

KW - Mechanical properties

KW - Scratch resistance

KW - Silicone

UR - http://www.scopus.com/inward/record.url?scp=85046122109&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85046122109&partnerID=8YFLogxK

U2 - 10.1016/j.porgcoat.2018.04.022

DO - 10.1016/j.porgcoat.2018.04.022

M3 - Article

AN - SCOPUS:85046122109

VL - 121

SP - 105

EP - 111

JO - Progress in Organic Coatings

JF - Progress in Organic Coatings

SN - 0300-9440

ER -