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Evaluation of mechanical properties and hydrophobicity of room‐temperature, moisture‐curable polysilazane coatings

Zhan, Ying ; Grottenmüller, Ralf ; Li, Wei ; Javaid, Farhan ; Riedel, Ralf (2021):
Evaluation of mechanical properties and hydrophobicity of room‐temperature, moisture‐curable polysilazane coatings.
In: Journal of Applied Polymer Science, 138 (21), p. 50469. Wiley, ISSN 0021-8995, e-ISSN 1097-4628,
DOI: 10.1002/app.50469,
[Article]

Abstract

Polysilazane coatings have a broad need in real-life applications, which require low processing or working temperature. In this work, five commercially available polysilazanes have been spin-coated on polycarbonate substrates and cured in ambient environment and temperature to obtain transparent, crack-free, and dense films. The degree of crosslinking is found to have a significant impact on the hardness and Young's modulus of the polysilazane films but has a minor influence on the film thickness and hydrophobicity. Among all five polysilazane coatings, the inorganic perhydropolysilazane-based coating exhibits the largest hardness (2.05 +/- 0.01 GPa) and Young's modulus (10.76 +/- 0.03 GPa) after 7 days of curing, while the polyorganosilazane-derived films exhibit higher hydrophobicity. The molecular structure of polysilazanes plays a key role in mechanical properties and hydrophobicity of the associated films, as well as the adhesion of coatings to substrates, providing an intuitive and reliable way for selecting a suitable polysilazane coating material for a specific application.

Item Type: Article
Erschienen: 2021
Creators: Zhan, Ying ; Grottenmüller, Ralf ; Li, Wei ; Javaid, Farhan ; Riedel, Ralf
Title: Evaluation of mechanical properties and hydrophobicity of room‐temperature, moisture‐curable polysilazane coatings
Language: English
Abstract:

Polysilazane coatings have a broad need in real-life applications, which require low processing or working temperature. In this work, five commercially available polysilazanes have been spin-coated on polycarbonate substrates and cured in ambient environment and temperature to obtain transparent, crack-free, and dense films. The degree of crosslinking is found to have a significant impact on the hardness and Young's modulus of the polysilazane films but has a minor influence on the film thickness and hydrophobicity. Among all five polysilazane coatings, the inorganic perhydropolysilazane-based coating exhibits the largest hardness (2.05 +/- 0.01 GPa) and Young's modulus (10.76 +/- 0.03 GPa) after 7 days of curing, while the polyorganosilazane-derived films exhibit higher hydrophobicity. The molecular structure of polysilazanes plays a key role in mechanical properties and hydrophobicity of the associated films, as well as the adhesion of coatings to substrates, providing an intuitive and reliable way for selecting a suitable polysilazane coating material for a specific application.

Journal or Publication Title: Journal of Applied Polymer Science
Journal volume: 138
Number: 21
Publisher: Wiley
Uncontrolled Keywords: Coatings, crosslinking, mechanical properties, structure-property relationships, surfaces and interfaces
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Date Deposited: 12 Mar 2021 07:20
DOI: 10.1002/app.50469
Official URL: https://onlinelibrary.wiley.com/doi/10.1002/app.50469
Projects: Merck KGaA, German Research Foundation (DFG), European Commission, Grant Number DU 424, ProjektDEAL
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