Wettability and hydrolytic stability of 3-aminopropylsilane coupling agent and phenol-urea-formaldehyde binder on silicate surfaces and fibers

D. V. Okhrimenko*, A. Budi, M. Ceccato, D. B. Johansson, Dorthe Lybye, Klaus Bechgaard, S. L.S. Stipp

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The stability of phenol-urea-formaldehyde (PUF) binder and 3-aminopropylsilane (APS) on composite silicate materials (fibers and wafers) was studied with surface sensitive techniques (X-ray photoelectron spectroscopy (XPS) and streaming potential) through a wide range of humidity and temperature and ab initio modelling complemented the results. Behavior was compared for wettability properties, determined by vapor adsorption and contact angle analysis. APS and PUF, deposited on the silicate surfaces, decrease surface energy and wettability but water adsorption remains high, facilitating hydrolytic decomposition of the composite material. Deposited APS is unstable at T>50°C and 75% RH, while PUF is less sensitive to high humidity and temperature. Molecular dynamics confirmed APS sensitivity to humidity. Water adsorption and surface energy decrease, and material stability increases when a hydrophobization agent is applied to APS/PUF treated surfaces. The direct correlation between wettability and stability of PUF/APS/fiber composites can contribute in designing new materials with controlled hydrophobic properties.
Original languageEnglish
Article number109431
JournalPolymer Degradation and Stability
Number of pages13
ISSN0141-3910
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Amorphous materials
  • Coupling agents
  • Fibre/matrix bond
  • Interface
  • Surface treatments

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