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硼-氮阻燃剂与氢氧化镁协同阻燃环氧树脂 被引量:9
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作者 刘伟时 张铁 +2 位作者 陈珊珊 王美晓 刘平 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2017年第5期36-41,共6页
将硼-氮阻燃剂2,4,6-三(4-硼酸-2-噻吩)-1,3,5-三嗪(3TT-3BA)与Mg(OH)_2进行复配,然后将其添加到环氧树脂(EP)中,通过热重分析、锥形量热、极限氧指数、垂直燃烧等测试方法,研究了3TT-BA/Mg(OH)_2复配体系对EP的阻燃性能。研究发现,3TT-... 将硼-氮阻燃剂2,4,6-三(4-硼酸-2-噻吩)-1,3,5-三嗪(3TT-3BA)与Mg(OH)_2进行复配,然后将其添加到环氧树脂(EP)中,通过热重分析、锥形量热、极限氧指数、垂直燃烧等测试方法,研究了3TT-BA/Mg(OH)_2复配体系对EP的阻燃性能。研究发现,3TT-3BA与Mg(OH)_2具有协同阻燃作用,添加10%3TT-3BA/10%Mg(OH)_2到EP中,其极限氧指数达到了32.5%,垂直燃烧达到了UL94 V-0等级。同时,3TT-BA/Mg(OH)_2复配体系还能有效减小EP热释放速率、热释放总量和生烟总量。通过扫描电镜等手段探讨了3TT-BA/Mg(OH)_2复配体系的阻燃机理。 展开更多
关键词 硼-氮阻燃剂 氢氧化镁 复配阻燃 环氧树脂
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芳基硼酸衍生物与氢氧化镁的协同阻燃性能 被引量:2
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作者 钟一平 王美晓 +2 位作者 彭朝阳 罗云庆 刘平 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2015年第10期43-47,共5页
为了发展新型有机/无机复配阻燃剂,将芳基硼酸衍生物三(4,4′,4″-三硼酸-苯基)胺(3BzN-3B)与Mg(OH)2进行复配,以环氧树脂(EP)作为被阻燃体系,利用热重分析、锥形量热和扫描电镜等手段,研究了3BzN-3B/Mg(OH)2复配阻燃体系对EP的阻燃性... 为了发展新型有机/无机复配阻燃剂,将芳基硼酸衍生物三(4,4′,4″-三硼酸-苯基)胺(3BzN-3B)与Mg(OH)2进行复配,以环氧树脂(EP)作为被阻燃体系,利用热重分析、锥形量热和扫描电镜等手段,研究了3BzN-3B/Mg(OH)2复配阻燃体系对EP的阻燃性能。研究发现,3BzN-3B/Mg(OH)2可以提高EP的残炭率。当用5%3BzN-3B/35%Mg(OH)2阻燃EP时,其极限氧指数达到31.9%,且垂直燃烧也达到了UL-94V-0等级。另外,3BzN-3B/Mg(OH)2还能够降低EP的热释放速率、热释放总量和烟释放总量。扫描电镜观察结果表明,经3BzN-3B/Mg(OH)2阻燃后的EP,其在燃烧后所形成炭层的表面致密,裂纹较少。 展开更多
关键词 芳基硼酸衍生物 氢氧化镁 复配阻燃剂 环氧树脂
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Electronic structure and spatial inhomogeneity of iron-based superconductor FeS 被引量:1
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作者 Chengwei Wang Meixiao Wang +12 位作者 Juan Jiang Haifeng Yang Lexian Yang Wujun Shi Xiaofang Lai Sung-Kwan Mo Alexei Barinov Binghai Yan Zhi Liu Fuqiang Huang Jinfeng Jia Zhongkai Liu Yulin Chen 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第4期110-115,共6页
Iron-based superconductor family FeX(X=S,Se,Te)has been one of the research foci in physics and material science due to their record-breaking superconducting temperature(FeSe film)and rich physical phenomena.Recently,... Iron-based superconductor family FeX(X=S,Se,Te)has been one of the research foci in physics and material science due to their record-breaking superconducting temperature(FeSe film)and rich physical phenomena.Recently,FeS,the least studied Fe X compound(due to the difficulty in synthesizing high quality macroscopic crystals)attracted much attention because of its puzzling superconducting pairing symmetry.In this work,combining scanning tunneling microscopy and angle resolved photoemission spectroscopy(ARPES)with sub-micron spatial resolution,we investigate the intrinsic electronic structures of superconducting FeS from individual single crystalline domains.Unlike FeTe or FeSe,FeS remains identical tetragonal structure from room temperature down to 5 K,and the band structures observed can be well reproduced by our ab-initio calculations.Remarkably,mixed with the 1×1 tetragonal metallic phase,we also observe the coexistence of √5×√5 reconstructed insulating phase in the crystal,which not only helps explain the unusual properties of FeS,but also demonstrates the importance of using spatially resolved experimental tools in the study of this compound. 展开更多
关键词 angle-resolved PHOTOEMISSION with spatially resolution scanning TUNNELING microscopy IRON-BASED SUPERCONDUCTOR electronic band structure
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Measurement of Superconductivity and Edge States in Topological Superconductor Candidate TaSe_(3) 被引量:1
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作者 Shuai Liu Si-Min Nie +6 位作者 Yan-Peng Qi Yan-Feng Guo Hong-Tao Yuan Le-Xian Yang Yu-Lin Chen Mei-Xiao Wang Zhong-Kai Liu 《Chinese Physics Letters》 SCIE CAS CSCD 2021年第7期110-115,共6页
Topological superconductors(TSCs)have been widely investigated in recent years due to their novel physics and ability to host Majorana fermions(MFs)which are key to topological quantum computation.Despite the great in... Topological superconductors(TSCs)have been widely investigated in recent years due to their novel physics and ability to host Majorana fermions(MFs)which are key to topological quantum computation.Despite the great interest,only a few compounds have been proposed as candidates of intrinsic TSCs,such as iron-based superconductor FeSe_(0.55)Te_(0.45) and 2M-WS_(2).Among them,quasi-one-dimensional superconductor TaSe_(3) possesses fascinating properties such as its simple stoichiometry,layered nature and chemical stability.Here,using scanning tunneling microscope/spectroscopy(STM/STS),we systematically investigate the topography and electronic structure of TaSe_(3).Our STM/STS measurement reveals large atomically flat,defect-free surfaces suitable for the search of MF;electronic density of states consistent with our angle-resolved photoemission result and band-structure calculations,and a uniform superconducting gap with a typical size of∼0.25 meV.Remarkably,additional edge states are observed in the vicinity of the terrace edge,suggesting they may have a topological origin.Our result proves the coexistence of superconductivity and topological electronic structure in TaSe_(3),making it an intriguing platform to investigate topological superconductivity. 展开更多
关键词 STABILITY TOPOLOGICAL SUPERCONDUCTOR
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Measurement of the bulk and surface bands in Dirac line-node semimetal ZrSiS
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作者 洪光昊 王成玮 +15 位作者 姜娟 陈成 崔胜涛 杨海峰 梁爱基 刘帅 吕洋洋 周健 陈延彬 姚淑华 卢明辉 陈延峰 王美晓 杨乐仙 柳仲楷 陈宇林 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第1期197-202,共6页
Dirac semimetals are materials in which the conduction and the valence bands have robust crossing points protected by topology or symmetry. Recently, a new type of Dirac semimetals, so called the Dirac line-node semim... Dirac semimetals are materials in which the conduction and the valence bands have robust crossing points protected by topology or symmetry. Recently, a new type of Dirac semimetals, so called the Dirac line-node semimetals (DLNSs), have attracted a lot of attention, as they host robust Dirac points along the one-dimensional (1D) lines in the Brillouin zone (BZ). In this work, using angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations, we systematically investigated the electronic structures of non-symmorphic ZrSiS crystal where we clearly distinguished the surface states from the bulk states. The photon-energy-dependent measurements further prove the existence of Dirac line node along the X-R direction. Remarkably, by in situ surface potassium doping, we clearly observed the different evolutions of the bulk and surface electronic states while proving the robustness of the Dirac line node. Our studies not only reveal the complete electronic structures of ZrSiS, but also demonstrate the method manipulating the electronic structure of the compound. 展开更多
关键词 Dirac line-node semimetal ZrSiS angle-resolved photoemission spectroscopy (ARPES) bulk andsurface states
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