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聚酰胺聚醚弹性体/石墨烯纳米复合材料的制备与表征 被引量:2
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作者 闫东广 宋玮琦 +1 位作者 李姜红 王春亭 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2019年第4期161-165,173,共6页
采用一步法原位聚合制备了聚酰胺聚醚弹性体/石墨烯(PA6-b-PEG/GNs)纳米复合材料。傅里叶变换红外光谱测试结果表明,加入一定量的GNs能够促进PA6-b-PEG缩聚反应;X射线衍射和差示扫描量热分析显示,GNs的加入能提高纳米复合材料的结晶度... 采用一步法原位聚合制备了聚酰胺聚醚弹性体/石墨烯(PA6-b-PEG/GNs)纳米复合材料。傅里叶变换红外光谱测试结果表明,加入一定量的GNs能够促进PA6-b-PEG缩聚反应;X射线衍射和差示扫描量热分析显示,GNs的加入能提高纳米复合材料的结晶度和熔点,当GNs含量为5%时,纳米复合材料的结晶温度和熔点均达到最大值;热重分析表明,随着GNs含量的增加,复合材料的起始分解温度、分解终止温度及热稳定性均得到有效提高;拉伸测试结果表明,PA6-b-PEG/GNs纳米复合材料的拉伸强度和弹性模量均比PA6-b-PEG高,但其断裂伸长率下降;此外,扫描电镜结果显示,GNs的加入能够降低PA6-b-PEG的微相分离程度,改善材料的相容性。 展开更多
关键词 聚酰胺聚醚/石墨烯 弹性体 纳米复合材料 原位聚合
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反应挤出原位阴离子聚合尼龙6/石墨烯复合微球的连续制备与表征 被引量:1
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作者 闫东广 王春亭 +2 位作者 刘晓栋 宋玮琦 李照磊 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2018年第12期101-105,共5页
以己内酰胺(CL)、苯乙烯(St)及氧化石墨烯(GO)为主要原料,首先在熔融的CL中经自由基聚合得到聚苯乙烯(PS)/CL/GO混合熔体,然后在双螺杆挤出机中引发CL阴离子聚合生成尼龙6(PA6),获得PS为连续相、GO选择性分布于球状PA6分散相的PA6/PS/G... 以己内酰胺(CL)、苯乙烯(St)及氧化石墨烯(GO)为主要原料,首先在熔融的CL中经自由基聚合得到聚苯乙烯(PS)/CL/GO混合熔体,然后在双螺杆挤出机中引发CL阴离子聚合生成尼龙6(PA6),获得PS为连续相、GO选择性分布于球状PA6分散相的PA6/PS/GO三元混合物,最后去除PS相制备PA6/GO复合微球。采用扫描电镜、透射电镜、热失重及差示扫描量热等方法,研究了GO在三元混合物中的选择分布、PA6/GO复合微球的结构及耐热性。结果表明,在三元混合物中GO选择性分布于PA6相中;随着GO含量增加,PA6/GO复合微球的直径减小;与纯PA6微球相比,PA6/GO复合微球具有更高的热稳定性。 展开更多
关键词 尼龙6 聚苯乙烯 石墨烯 反应挤出 微球
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Quantitative Interpretation of Gravity Anomalies in the Kribi-Campo Sedimentary Basin (South Cameroon) Based on Spectral Analysis and 2.5D Modelling: Structural Implications
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作者 Kue Petou Rokis Malquaire Owona Angue Marie Louise Clotilde +5 位作者 Njingti Nfor Eloundou Essama Lionel Mioumnde Arthur Paterne Kue Negham Martine Clémence Manguelle-Dicoum Eliezer weiqi song 《Open Journal of Earthquake Research》 2020年第3期240-254,共15页
Ground gravity survey was recently carried out in the Lolabe-Campo area, which constitutes the southern onshore portion of the Kribi-Campo sub-basin in South Cameroon. The obtained gravity data were processed and inte... Ground gravity survey was recently carried out in the Lolabe-Campo area, which constitutes the southern onshore portion of the Kribi-Campo sub-basin in South Cameroon. The obtained gravity data were processed and interpreted in order to elucidate the subsurface geology of the area in which preliminary studies highlighted the presence of an intrusive igneous body. In order to determine the nature and the characteristics of this body, spectral analysis, ideal body solution and 2.5D modelling methods were applied to the gravity data. The results suggest that the emplacement, breaking up and separation of the intrusive igneous body were the outcome of two tectonic events corresponding to an upward vertical translational tectonic movement followed by an anticlockwise rotational faulting tectonic movement. From a density contrast of 0.13 g&#183cm&#453, the two isolated bodies have an estimated density of 2.80 g&#183cm&#453 which is comparatively higher than the average density of 2.67 g&#183cm&#453 of the autochthonous rocks. These two blocks are completely surrounded by both sedimentary and metamorphic formations and are confined between the depths of 0.6 km and 3.5 km. The highly dense nature of the rocks and their location around the Atlantic Ocean led to the conclusion that the two intrusive bodies are composed principally of gabbro. The disposition and shape of the open zone resulting from the separation of the blocks are suggestive of a trap for the accumulation of hydrocarbons and mineral resources. 展开更多
关键词 Spectral Analysis IDEAL Body 2.5D MODELLING Formation Depth INTRUSIVE BLOCKS
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Associations Between Specific Diets, Dietary Diversity, and Cognitive Frailty in Older Adults — China, 2002–2018 被引量:1
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作者 Qingmei Huang Wenfang Zhong +9 位作者 Ziting Chen Zhihao Li Peidong Zhang Yujie Zhang Peiliang Chen Qi Fu weiqi song Yuebin Lyu Xiaoming Shi Chen Mao 《China CDC weekly》 SCIE CSCD 2023年第39期872-876,I0005,I0006,共7页
Summary What is already known about this topic?The relationship between specific dietary patterns and dietary diversity with cognitive frailty continues to be a subject of ambiguity.What is added by this report?This r... Summary What is already known about this topic?The relationship between specific dietary patterns and dietary diversity with cognitive frailty continues to be a subject of ambiguity.What is added by this report?This research revealed that regular consumption of fruit,meat,bean products,garlic,and tea was connected to a decreased risk of cognitive frailty.Compared to participants with dietary diversity score(DDS)≤6 points,those with DDS of 9–10,11–12,and≥12 had a lower risk of cognitive frailty. 展开更多
关键词 DDS AMBIGUITY CONTINUE
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