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二维氧化石墨改性氯化聚乙烯橡胶复合材料的制备
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作者 厉枝 宗成中 《合成橡胶工业》 CAS 北大核心 2019年第1期70-70,共1页
采用二维氧化石墨(GO)改性氯化聚乙烯橡胶(CM)制备了GO/CM复合材料,通过热重分析研究了适用于该复合材料的硫化体系,测试了使用不同硫化体系所制备复合材料的力学性能,并考察了偶联剂种类对GO在CM中分散效果的影响。结果表明,传统CM普... 采用二维氧化石墨(GO)改性氯化聚乙烯橡胶(CM)制备了GO/CM复合材料,通过热重分析研究了适用于该复合材料的硫化体系,测试了使用不同硫化体系所制备复合材料的力学性能,并考察了偶联剂种类对GO在CM中分散效果的影响。结果表明,传统CM普遍使用的过氧化物硫化体系并不适用于GO/CM复合材料,而使用硫脲体系(NA-22+s)硫化时可以得到性能较为稳定的硫化胶。与硫脲硫化体系相比,在165℃的硫化温度下,其他几种硫化体系会产生小分子物质,影响胶料的交联,使硫化胶中产生气泡,不利于其性能。使用硫脲硫化体系制备的GO/CM复合材料具有更优异的力学性能。KH-550的氨基可与GO的含氧基团发生反应,以其作为偶联剂可以实现GO在CM中的有效分散,更有利于复合材料性能的提升。 展开更多
关键词 二维氧化石墨 氯化聚乙烯橡胶 复合材料 硫化体系 力学性能 偶联改性
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Independent thickness and lateral size sorting of two-dimensional materials 被引量:1
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作者 Minsu Liu Chuang Yang +2 位作者 Ling Qiu Hui-Ming Cheng Bilu Liu 《Science China Materials》 SCIE EI CAS CSCD 2021年第11期2739-2746,共8页
Two-dimensional(2D)materials possess unique thickness-and lateral-size-dependent properties.Many efforts have been devoted to obtaining 2D materials with narrow structure heterogeneity while it is still challenging to... Two-dimensional(2D)materials possess unique thickness-and lateral-size-dependent properties.Many efforts have been devoted to obtaining 2D materials with narrow structure heterogeneity while it is still challenging to independently control their thickness and lateral size,limiting their widespread applications.Here,we develop a three-step method which achieves independent thickness and lateral size sorting of 2D materials.Taking 2D h-BN flakes as an example,their thickness and lateral size are independently sorted to different fractions with thicknesses smaller than 6 nm.In addition,the 2D h-BN flakes possess narrow distributions of both thickness and lateral size.We further develop a force field extraction method and achieve scalable size sorting of 2D h-BN,which is universal for sorting other 2D materials including MoS2 and graphene oxide.This work reports an effective method to produce structure homogenous 2D materials and will help fundamental studies and applications of 2D materials where thickness and lateral size are of concern. 展开更多
关键词 two-dimensional materials SORTING H-BN MoS2 graphene oxide thickness lateral size
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