Alkoxysilane functionalized polycaprolactone/polysiloxane modified epoxy resin through sol-gel process |
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Authors: | Pinggui Liu Jiangxuan Song Xingquan Liang Qifang Li |
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Affiliation: | a Beijing Institute of Aeronautical Materials, P.O. Box 81-9, Beijing 100095, China b School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China c School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China |
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Abstract: | Incorporating elastic polysiloxane and/or an inorganic silica network in epoxy resin could result in the enhancement of physico-chemical properties due to the existence of Si-O bonds. To improve the compatibility between polysiloxane and epoxy matrices and intensively strengthen the properties of the modified system, here polysiloxane was introduced into epoxy resin through compatibilizing epoxy-immiscible polysiloxane with epoxy-miscible polycaprolactone segments via a sol-gel process. To fulfill the process, a blend containing alkoxysilane-functionalized polycaprolactone/polydimethylsiloxane (PCS-2Si) was firstly synthesized using direct nucleophilic addition between -OH groups of polydiol and -NCO of a silane. And then a series of modified epoxy resins were prepared in different epoxy/PCS-2Si weight ratios. All the modified composites were characterized by conventional methods, and their morphological, thermal degradation and surface properties were studied. The results showed that increasing the PCS-2Si content caused the changes of miscibility between epoxy and polysiloxane. Also, the thermal stability of the modified composites was greatly improved. As for the temperature value at 5% weight loss, it reached to 308.5 °C for the composite containing 50-60% (wt%) PCS-2Si, over 150 °C higher than that for neat amine-cured epoxy resin. Similarly, the modified composites showed good hydrophobicity. The improvement of these properties came from the improved interaction between PCS-2Si and epoxy, the forming of Si-O-Si network and the enrichment of siloxane chains on the surface of films. Therefore, it is believed that this modified epoxy appears promising as new high performance and highly functional materials. |
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Keywords: | Polycaprolactone Polydimethylsiloxane Epoxy resin Sol-gel process Morphology Thermal properties |
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