Über die Umsetzung von Cellulose und Lignin mit Isocyanaten bzw. isocyanatgruppenhaltigen Präpolymeren

Abstract

In der vorliegenden Arbeit wird uber den Stand der Untersuchungen zum Reaktionsverhalten von Cellulose und Lignin bei der Umsetzung rnit Isocyanaten bzw. isocyanatgruppenhaltigen Prapolymeren berichtet. AuDerdem werden die durch die Modifizierung erreichten Eigenschaftsveranderungen sowie potentielle Anwendungsbereiche der Produkte besprochen. 0 peanyusx yemioJcoaw u fiuenuna c uaoyuanammu uau n p e n o m w e p w u , codepmaquntu uaoyuanamnm zpynna, ~PEIBOARTCH Ramme o COCTOHHHEI pa6OT B 06JIaCTEi noseAeHm qennmno3~ EI mrHma npm peaHqmx c m o q~a~a -T a l i UJIH IIpeIIOJIHMepaMEi, COAepXaIQFiMEi El8OqEiaHaTHbIe rpyIIIIbI. KpOMe TOrO PaCCMaTphIBaIOTCH Ei3MeHeHEiR CBO~CTB BTHX MaTepHanOB B pe3JVIbTaTe MOAEi$HK~EIH, a TaKme B08MOmHbIe o6nacw UpHMeHeHEiH MO,I(EII$EiqHPO-BEIHHMX maTepHanoB. The reaction of cellulose and lignin with isoyanates and prepolymers containing isocyanate groupsThe investigations on the reaction of cellulose and lignin with isocyanates and prepolymers containing isocyanate groups are reviewed. Further the changes in properties caused by modification and the fields of possible application of the products are described.

Influence of coupling agent in compatibility of post-consumer HDPE in thermoplastic composites reinforced with eucalyptus fiber

“…Isocyanates have also been used as coupling agents in natural fiber reinforced polymer composites. Urethane links can be formed between the isocyanate functionality and the hydroxyl group of natural fibers 17 , consequently blocking the hygroscopic hydroxyl sites 18 . Silanes are recognized as efficient coupling agents as they can be hydrolyzed to *e-mail: andrecatto@terra.com.br expose the active silanol groups toward the hydroxyl groups of the wood, thereby reacting to form chemical bonding 19 .…”

Influence of Rare-earth Coupling Agent on Non-isothermal Crystallization Behaviour of Wood Flour/Polypropylene Composites

“…Urethane links can be formed between the isocyanate functionality and the hydroxyl group of natural fibres, consequently blocking the hygroscopic hydroxyl sites [9][10][11] . Silane was also used as surface modifier of the filler, to improve the interaction between the polypropylene matrix and wood flour [12][13][14] . Rare-earth (RE) is a commercial coupling agent, and its compatibility with the resin and filler has good synergy in improving the material stiffness and impact strength.…”