Liangwei Lin, Shuangshuang Li, Changxin Cai, Min Zhong, Zhaoqun Pan
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The synthesis of tetrafunctional epoxy-modified silicone resins and the enhancement of toughness application at low temperature
To strengthen the toughness of thermosetting resins under low temperatures, tetrafunctional epoxy-modified silicone resins (TESR-1/4/9) with different lengths of flexible chains were synthesized and served as tougheners for the epoxy system. The chemical structures of TESR-1/4/9 were determined via Fourier transform infrared spectroscopy as well as nuclear magnetic resonance (13C-NMR and 1H-NMR). At room temperature, with 10 wt% of TESR-1, the elongation at break of the epoxy resin (17.67%) was added up to 68.93% in comparison with neat epoxy resin (10.46%). At −70 ℃, with the content of 5 wt% TESR-4, the value of the elongation at break (12.66%) was 37.31% higher than that of the neat epoxy (9.22%). A scanning electron microscope was utilized to observe the fractured surfaces of the resins to investigate the toughening behaviors of the tougheners (TESR-1/4/9). The dynamic mechanical analysis also demonstrated the improvement of the epoxy resins in toughness and good compatibility between TESR-1/4/9 and the epoxy matrix. These research findings can offer a new perspective for the enhancement of epoxy resins in low-temperature toughness.
期刊介绍：
The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.
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