Biobased Aromatic-Aliphatic Polyols from Cardanol by Thermal Thiol-Ene Reaction

• 作者: Maha LShrestha Mihail Ionescu Nikola Bilic′ Tom Upshaw Xianmei Wan Zoran SPetrovic′
• 来源期刊: 可再生材料杂志(英文)
• 学科: 化学
• 关键词: THIOL-ENE MERCAPTANS CASHEW nut shell liquid polyurethanes
• 年，卷（期）: kzsclzzyw_2018,（1）
• 页码范围: 87-101
• 页数: 15页
• 分类号: O62

摘要

Cardanol is a natural phenol which is obtained from high vacuum distillation of cashew nut shell liquid.It contains a hydrocarbon chain of 15 carbon atoms in the meta position,either with one,two or three nonconjugated double bonds.This article describes thermal thiol-ene reaction to synthesize new cardanol-based polyols for polyurethanes with aromatic-aliphatic structure.Phenolic hydroxyl group was blocked by alkoxylation and 2-mercaptoethanol was added to the double bonds of propoxylated cardanol.The resultant product is a mixture of polyols that may contain one,two,three or four hydroxyl groups,as a function of the number of double bonds reacted with 2-mercaptoethanol.Similar polyols,but with much higher functionality,were also synthesized from condensation of cardanol-based novolacs with formaldehyde.These cardanolbased polyols were further utilized to prepare rigid polyurethane foams(PUs)with excellent physical and mechanical properties,useful for various applications in chemical and food industries.