Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-8852
Main Title: Boehmite Nanofillers in Epoxy Oligosiloxane Resins: Influencing the Curing Process by Complex Physical and Chemical Interactions
Author(s): Topolniak, Ievgeniia
Hodoroaba, Vasile-Dan
Pfeifer, Dietmar
Braun, Ulrike
Sturm, Heinz
Type: Article
Language Code: en
Abstract: In this work, a novel boehmite (BA)-embedded organic/inorganic nanocomposite coating based on cycloaliphatic epoxy oligosiloxane (CEOS) resin was fabricated applying UV-induced cationic polymerization. The main changes of the material behavior caused by the nanofiller were investigated with regard to its photocuring kinetics, thermal stability, and glass transition. The role of the particle surface was of particular interest, thus, unmodified nanoparticles (HP14) and particles modified with p-toluenesulfonic acid (OS1) were incorporated into a CEOS matrix in the concentration range of 1–10 wt.%. Resulting nanocomposites exhibited improved thermal properties, with the glass transition temperature (Tg) being shifted from 30 °C for unfilled CEOS to 54 °C (2 wt.% HP14) and 73 °C (2 wt.% OS1) for filled CEOS. Additionally, TGA analysis showed increased thermal stability of samples filled with nanoparticles. An attractive interaction between boehmite and CEOS matrix influenced the curing. Real-time infrared spectroscopy (RT-IR) experiments demonstrated that the epoxide conversion rate of nanocomposites was slightly increased compared to neat resin. The beneficial role of the BA can be explained by the participation of hydroxyl groups at the particle surface in photopolymerization processes and by the complementary contribution of p-toluenesulfonic acid surface modifier and water molecules introduced into the system with nanoparticles.
URI: https://depositonce.tu-berlin.de/handle/11303/9831
http://dx.doi.org/10.14279/depositonce-8852
Issue Date: 9-May-2019
Date Available: 20-Aug-2019
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): boehmite
nanocomposite
cationic photocuring
cycloaliphatic epoxy oligosiloxane
epoxy conversion degree
real-time infrared spectroscopy
License: https://creativecommons.org/licenses/by/4.0/
Journal Title: Materials
Publisher: MDPI
Publisher Place: Basel
Volume: 12
Issue: 9
Article Number: 1513
Publisher DOI: 10.3390/ma12091513
EISSN: 1996-1944
Appears in Collections:FG Tribologie » Publications

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