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Sustainable shape memory polymers based on epoxidized natural rubber cured by zinc ferulate via oxa-michael reaction

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International Journal of Smart and Nano Materials 2015年第4期6卷 195-210页

作者： Xuhui Zhang Tengfei Lin Zhenghai Tang Kailun Sun Baochun Guo Department of Polymer Materials and Engineering South China University of TechnologyGuangzhou 510640P.R.China

Although various shape memory polymers(SMPs)or diverse applications have been widely reported,the SMPs based on rubbers have been rarely realized due to the low triggering temperature of *** another aspect,the SMPs based on sustainable substances are highly desired for the growing shortage in fossil *** the present study,we accordingly developed the sustainable SMPs with tunable triggering temperature,based on natural rubber(NR)and ferulic acid(FA)as the raw ***,the SMPs are based on a crosslinked network of epoxidized natural rubber(ENR)crosslinked by in situ formed zinc ferulate(ZDF)via oxa-michael *** excellent shape memory effect(SME)is found in these SMPs,as evidenced by the high fixity/recovery ratio and the tunable triggering *** the incorpora-tion of natural halloysite nanotubes(HNTs),the stress and recovery rate of the SMPs are found to be tunable,which widens the application of this kind of *** combination of adoption of sustainable raw materials,and the excellent and tunable SME makes these SMPs potentially useful in many applications,such as various actuators and heat-shrinkable package materials.

关键词： shape memory polymers epoxidized natural rubber ferulic acid oxa-michael reaction sustainable

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A tandem asymmetric oxidation-oxa-michael sequence for dearomatization ofβ-naphthols

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Chinese Chemical Letters 2022年第9期33卷 4273-4276页

作者： Linqing Wang Haiyong Zhu Tianyu Peng Yingfan Xu Yanzhe Hou Shixin Li Shiming Pang Hailong Zhang Dongxu Yang Key Laboratory of Preclinical Study for New Drugs of Gansu Province Institute of Drug Design&SynthesisSchool of Basic Medical SciencesLanzhou UniversityLanzhou 730000China

A catalytic asymmetric hydroxylative dearomatization reaction has been disclosed,and the products can smoothly transform into spiroannulation adducts by simply treated with a base under mild *** in-situ generated magnesium catalytic methods are developed by application of combinational *** concise transformaitons of the spiroannulation adducts have been carried out.

关键词： Oxidative dearomatization oxa-michael reaction Asymmetric reaction Chiral ligands Magnesium catalyst

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