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- 저자 : Zhengkai Yuan (검색결과 2 건)
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Zhengkai Yuan,Jinhong Yu,Baolin Rao,Hua Bai,Nan Jiang,Jian Gao,Shaorong Lu 한국고분자학회 2014 Macromolecular Research Vol.22 No.4
In this report, we demonstrate that the thermal conductivity, glass transition temperature, thermal stabilityand dynamical mechanical properties of epoxy composites could all be improved by incorporating hyperbranchedaromatic polyamide grafted silicon carbide (SiC-HBP) whiskers, using a solution method. The morphology andthermal properties of these newly modified epoxy composites were systematically analyzed and studied. Fouriertransform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), and thermal gravimetricanalyses (TGA) proved hyperbranched aromatic polyamide grafted SiC whiskers were successfully prepared bysolution polymerization. The thermal conductivity of epoxy composite with 30 wt% of SiC-HBP had 2-fold improvement,compared to that of the neat epoxy. Besides, the glass transition temperatures (Tg) and dynamical mechanicalproperties of the epoxy composites were also raised by the addition of SiC-HBP, which indicates strong interfacialadhesion between SiC-HBP and the epoxy matrix. Most importantly, the incorporation of SiC-HBP in the epoxymatrix could effectively improve the thermal stability of the epoxy composites, according to our thermogravimetricanalysis (TGA).
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Zhengkai Wei,Yi Wang,Xiaowei Fu,Liang Jiang,Yuechuan Wang,Anqian Yuan,Hualiang Xu,Jingxin Lei 한국고분자학회 2021 Macromolecular Research Vol.29 No.8
The thermosetting polyurea possessed high tensile strength and elongations at break due to strong intermolecular interactions, but their recycling and reprocessing remains a great challenge, especially at a temperature below 100℃. Herein, the novel crosslinked polyurea with excellent recycling and reprocessing properties has been prepared by introducing the Diels-Alder dynamic covalent bond. The chemical structure, thermal mechanical properties and reprocessing performance of the crosslinked polyurea were investigated. The prepared polyurea has low relaxation time of ~4 min at 80℃ for facile reprocessing. The tensile strength and elongation at break of crosslinked polyurea could reach 15.24 MPa and 529.2%, respectively, and its mechanical properties remain almost unchanged even after repeated processing. This work has realized the recycling of crosslinked polyurea, which has huge potential applications in environmental protection and recycling of waste plastics.
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