Korean Journal of Chemical Engineering

, Volume 33, Issue 8, pp 2469–2477 | Cite as

Spectroscopic analysis of methacrylate groups introduced on silica particle surfaces by the aza-Michael addition reaction

Materials (Organic, Inorganic, Electronic, Thin Films)
First Online:
Received:
Accepted:

Abstract

We modified silica nanoparticles with a N′-(3-trimethoxysilylpropyl)diethylenetriamine (TPDT) silane coupling agent, which has one primary and two secondary amino groups in each molecule, to introduce amino groups on silica surfaces. After surface modification of silica, we used an acrylate group containing 3-(acryloyloxy)-2-hydroxypropyl methacrylate (AHM) to introduce free radical polymerizable methacrylate groups by the aza-Michael addition reaction. Fourier transform infrared spectroscopy (FTIR), elemental analysis (EA), liquid state 1H and 13C nuclear magnetic resonance spectroscopy (NMR) and solid state cross polarization magic angle spinning (CP/MAS) 29Si NMR were used to investigate the effects of various reaction conditions on the degree of reaction between the N-H groups of the TPDT-modified silica surface and the acrylate groups of AHM. We found that approximately 48% of the N-H groups of the TPDT-modified silica surface reacted with the acrylate groups of AHM, compared with approximately 83% of the N-H groups of pure TPDT reacting with the acrylate groups of AHM at the same reaction conditions. This lower degree of the aza-Michael addition reaction between the N-H groups of the TPDT grafted on the solid silica particle versus the N-H groups of pure TPDT, both with acrylate groups of liquid AHM, may be caused by the lower mobility of the N-H groups of the grafted TPDT on the solid silica particle and the higher steric hindrance caused by the solid silica particle.

Keywords

Silica Silane Coupling Agent Hydrolysis Michael Addition Reaction Methacrylate Groups 
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Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2016

Authors and Affiliations

  1. 1.Department of Chemical EngineeringKeimyung UniversityDaeguKorea

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