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Développement de nouveaux matériaux à base de polymères naturels et leurs applications

Abstract : With the constant increase of oil prices and with the dwindling of fossil resources, "green" alternatives must be found. Thus, first research was conducted on the possibility to develop synthetic phenolic adhesives for wood-based panels where a part of phenol was substituted by wheat proteins. Similarly, tannins which are natural polyphenolic molecules can be used as an alternative to synthetic chemical products. Chestnut tannin, a hydrolysable tannin was used to substitute part of phenol during the synthesis of phenolic resins. The characteristics of these resins were studied and the resins used for the manufacture of rigid phenolic foams. This is a new step towards the development and future commercialization of more environmentally friendly materials. Furthermore, condensed flavonoid tannins were also used in the development of tannins-furanic biobased rigid foams. Quebracho wood tannin extract was coupled with furfuryl alcohol another material of natural, agricultural origin. These "green" foams show good mechanical strength, good thermal performance and do not burn, thus they are entirely suitable for use in building insulation. Finally, new types of materials made from the same natural products (tannins and furfuryl alcohol) were developed during the research described in this thesis: biobased abrasive and friction materials. Abrasive wheels and abrasive discs for steel molding and steel cutting using a biobased matrix were thus developed and tested. Moreover, automotive brake pads were prepared and were tested under real vehicle application conditions. All these new materials showed excellent properties compared to commercial materials and yielded excellent results comparable and sometime superior to their synthetic commercial equivalents
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Submitted on : Thursday, March 29, 2018 - 1:33:08 PM
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Marie-Christine Lagel. Développement de nouveaux matériaux à base de polymères naturels et leurs applications. Autre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0178⟩. ⟨tel-01752138⟩



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