Physicochemical Characterization of Functional Lignin-Silica Hybrid Fillers for Potential Application in Abrasive Tools.

Beata Strzemiecka,Tadeusz Szalaty,Łukasz Klapiszewski,Adam Voelkel,Tomasz Sterzyński,Artur Jamrozik,Danuta Matykiewicz,Teofil Jesionowski

doi:10.3390/ma9070517

Beata Strzemiecka, Tadeusz Szalaty + Show 6 more

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https://doi.org/10.3390/ma9070517

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Journal: Materials	Publication Date: Jun 25, 2016
Citations: 81	License type: CC BY 4.0

Affiliation: Poznań University of Technology

Abstract

Functional lignin–SiO2 hybrid fillers were prepared for potential application in binders for phenolic resins, and their chemical structure was characterized. The properties of these fillers and of composites obtained from them with phenolic resin were compared with those of systems with lignin or silica alone. The chemical structure of the materials was investigated by Fourier transform infrared spectroscopy (FT-IR) and carbon-13 nuclear magnetic resonance spectroscopy (13C CP MAS NMR). The thermal stability of the new functional fillers was examined by thermogravimetric analysis–mass spectrometry (TG-MS). Thermo-mechanical properties of the lignin–silica hybrids and resin systems were investigated by dynamic mechanical thermal analysis (DMTA). The DMTA results showed that abrasive composites with lignin–SiO2 fillers have better thermo-mechanical properties than systems with silica alone. Thus, fillers based on lignin might provide new, promising properties for the abrasive industry, combining the good properties of lignin as a plasticizer and of silica as a filler improving mechanical properties.

Highlights

Interface interactions in composites are crucial for their final properties
The Fourier transform infrared spectroscopy (FT-IR) spectra of both lignin and silica are shown in Figure 1a,b, and FT-IR spectra of properties ofhybrid the obtained
́1, and 744 cm1 were absorption maxima characteristic of the guaiacyl unit cm The both lignin and silica are shown in Figure 1a,b, and FT-IR spectra of in lignin

Summary

Introduction

Interface interactions in composites are crucial for their final properties. Control over the surface and interface aspects of polymers and their fillers are of paramount importance. Robust interfaces are critical regions that enable the long-term use of the polymer composites, and contribute to the performance of the end products. For this reason, they must be controlled at the molecular level with appropriate chemistry strategies to ensure their long-term stability. One of the important objectives of this research is to control the surface composition and reactivity of the inorganic material embedded in the polymer matrices. For this reason, intensive research is being conducted on hybrid materials: organic-inorganic compounds with relevance to many composites (e.g., structural adhesives, hairy nanoparticles for optical sensors, medical implants, etc.), as well as abrasive tools. The rationale for the application of hybrid materials is two-fold: (i) to improve the dispersion of nanofillers in polymer matrices [1]; and (ii) to enhance the mechanical properties of the host polymer matrix [1,2]

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