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丙烯酸阴离子型共聚改性分散剂的制备及应用 被引量:3
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作者 王鑫亮 宋春梅 万波 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2020年第4期15-20,28,共7页
以丙烯酸为主单体,马来酸酐、丙烯酰胺、甲基丙烯酸羟乙酯为改性单体,通过氧化还原引发自由基共聚合制备了4种阴离子型共聚改性分散剂,用于分散超细TiO2。对TiO2悬浮液的黏度、粒径和扫描电镜等的结果对比,聚丙烯酸-丙烯酰胺-甲基丙烯... 以丙烯酸为主单体,马来酸酐、丙烯酰胺、甲基丙烯酸羟乙酯为改性单体,通过氧化还原引发自由基共聚合制备了4种阴离子型共聚改性分散剂,用于分散超细TiO2。对TiO2悬浮液的黏度、粒径和扫描电镜等的结果对比,聚丙烯酸-丙烯酰胺-甲基丙烯酸羟乙酯(PAA-AM-HEMA)有很好的分散效果。核磁共振分析其单体单元组成摩尔比为n(AA)∶n(AM)∶n(HEMA)=14∶1∶2.7;该分散剂中包含有79%的羧基、5.6%的酰胺基和15.4%的羟基;最佳使用量为0.5%(分散剂固体份/钛白粉的质量比)即可使TiO2/DP4/H2O(DP指聚合物分散剂)黏度降低为TiO2/H2O初始黏度的0.5%;TiO2/DP4/H2O中TiO2平均粒径降为TiO2/H2O初始粒径的0.06%,DP4具有微量高效的分散性能。 展开更多
关键词 阴离子型共聚物 改性分散剂 聚丙烯酸 TIO2 悬浮液
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Liquid phase exfoliated boron nanosheets for all-optical modulation and logic gates
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作者 chunmei song Yunlong Liao +1 位作者 Yuanjiang Xiang Xiaoyu Dai 《Science Bulletin》 SCIE EI CAS CSCD 2020年第12期1030-1038,M0004,共10页
Boron nanosheets possess unique photoelectric properties, including photosensitivity, photoresponse,and optical nonlinearity. In this article, we show the interaction between light and boron nanosheets in which concen... Boron nanosheets possess unique photoelectric properties, including photosensitivity, photoresponse,and optical nonlinearity. In this article, we show the interaction between light and boron nanosheets in which concentric rings formed in the far field, which attributed to the strong Kerr nonlinearity of boron nanosheets. Furthermore, the distortion, regulation and relationship between the Kerr nonlinearity and effective mass or carrier mobility of the diffraction rings of boron nanosheets have been investigated.Our work shows that the spatial self-phase modulation effect of boron nanosheets is indeed caused by nonlocal electronic coherence. In addition, we have implemented all-light modulation and all-light logic gates based on the prepared boron nanosheets. We believe that our results will provide a powerful demonstration of nonlinear photonic devices based on boron nanosheets and a reference for photonic devices based on two-dimensional materials. 展开更多
关键词 Kerr nonlinearity Boron nanosheets Spatial self-phase modulation All-optical modulation All-optical logic gates
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