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Open AccessArticle

Boehmite Nanofillers in Epoxy Oligosiloxane Resins: Influencing the Curing Process by Complex Physical and Chemical Interactions

1
Federal Institute for Material Research and Testing (BAM), 12205 Berlin, Germany
2
Institute Machine Tools and Factory Management, Technical University Berlin, 10587 Berlin, Germany
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(9), 1513; https://doi.org/10.3390/ma12091513
Received: 22 April 2019 / Revised: 6 May 2019 / Accepted: 6 May 2019 / Published: 9 May 2019
(This article belongs to the Special Issue Metal and Polymer Matrix Composites: Processing and Applications)
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. View Full-Text
Keywords: boehmite; nanocomposite; cationic photocuring; cycloaliphatic epoxy oligosiloxane; epoxy conversion degree; real-time infrared spectroscopy boehmite; nanocomposite; cationic photocuring; cycloaliphatic epoxy oligosiloxane; epoxy conversion degree; real-time infrared spectroscopy
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MDPI and ACS Style

Topolniak, I.; Hodoroaba, V.-D.; Pfeifer, D.; Braun, U.; Sturm, H. Boehmite Nanofillers in Epoxy Oligosiloxane Resins: Influencing the Curing Process by Complex Physical and Chemical Interactions. Materials 2019, 12, 1513.

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