环氧树脂
香兰素
阻燃剂
极限抗拉强度
材料科学
双酚A
烧焦
环氧氯丙烷
固化(化学)
双酚
聚合物
复合材料
有机化学
化学
热解
作者
Sheng Wang,Songqi Ma,Xu Cheng,Liu Yuan,Jinyue Dai,Zongbao Wang,Xiaoqing Liu,Jing Chen,Xiong Shen,Jingjing Wei,Jin Zhu
出处
期刊:Macromolecules
[American Chemical Society]
日期:2017-02-24
卷期号:50 (5): 1892-1901
被引量:348
标识
DOI:10.1021/acs.macromol.7b00097
摘要
Lignin derivative vanillin when coupled with diamines and diethyl phosphite followed by reaction with echichlorohydrin yields high-performance flame retardant epoxy resins. Biorenewable and environment-friendly flame retardant alternatives to bisphenol A epoxy resins (having plenty of applications such as coatings, adhesives, composites, etc.) have captured great attention due to their ecological and economic necessity. Vanillin, an industrial scale monoaromatic compound from lignin, is a promising sustainable candidate for high-performance polymers, while synthesis of diepoxies is challenging. Meanwhile, bio-based epoxy resins combining high performance and excellent fire resistance are more difficult to be achieved. In this paper, two novel bio-based epoxy monomers EP1 and EP2 were synthesized by one-pot reaction containing Schiff base formation and phosphorus–hydrogen addition between vanillin, diamines, and diethyl phosphite, followed by reacting with epichlorohydrin. Their reactivities are similar to bisphenol A epoxy resin DGEBA. After curing they showed excellent flame retardancy with UL-94 V0 rating and high LOI of ∼32.8%, which was due to the outstanding intumescent and dense char formation ability. Meanwhile, it was found that the cured vanillin-based epoxies had exceedingly high Tgs of ∼214 °C, tensile strength of ∼80.3 MPa, and tensile modulus of ∼2709 MPa, much higher than the cured DGEBA with Tg of 166 °C, tensile strength of 76.4 MPa, and tensile modulus of 1893 MPa; the properties of vanillin-based epoxies are easy to be regulated by using different “coupling” agents—diamines—during the synthesis process.
科研通智能强力驱动
Strongly Powered by AbleSci AI