固相自引发基团置换反应制备LiNi1/3Co1/3Mn1/3O2正极材料

自从2001年Ohzuku T和Makimura Y报导LiNi1/3Co1／3Mn1/3O2正极材料以来，其一直被认为是最有可能取代LiCoO2的新型锂离子二次电池正极材料之一。氢氧化物共沉淀法是最常用的一种合成LiNi1/3Co1／3Mn1/3O2材料的方法，通过混合氢氧化物共沉淀法可以获得有着均一分布且具有很高的振实密度的球形LiNi1/3Co1/3Mn1/3O2。     

N-甲基丙烯酰-N′-嘧啶基哌嗪及其聚合物的荧光光谱研究

A novel acrylic monomer bearing pyrimidino-moiety, N-methacrylyl-N'-pyrimidinopipe-razine (MPMP) was synthesized by the reaction of N-pyrimidinopiperazine and methacrylyl chloride in the presence of triethylamine. Both absorption and fluorescence spectum for the monomer and its polymer were recorded. It was observed that the fluorescence intensity of monomeric MPMP was slightly lower than that of its polymer. The monomer did not dramatically appear its structural self-quenching effect as we have reported previously. The fluores-cence of the polymer,P(MPMP) culd be quenched by electron-deficient quenchers such as methacrylonitrile,acrylonitrile,fumaronitrile; methyl acrylate and methyl methacrylate. The Stern-Volmer constants of those quenchers for P(MPMP) were determined.     

锆基金属有机骨架材料用于四甲基硅烷/异戊烷分离

在半导体工业中,从四甲基硅烷(TMS)/异戊烷混合物中高效捕获异戊烷从而获得超高纯度的TMS是非常重要的。在本工作中,我们选择了具有笼结构的MOF-801,通过其对TMS和异戊烷吸附能力的差异,实现了TMS与异戊烷的分离。气体吸附测试结果表明,在298 K和60 kPa时,MOF-801对异戊烷吸附量为2.56 mmol·g^-1,而其对TMS的吸附量为1.20 mmol·g^-1。理想吸附溶液理论(IAST)计算结果表明,MOF-801对TMS/异戊烷(95∶5,体积比)混合物的分离选择性达到105.8。而之后的液相吸附分离实验进一步验证了MOF-801的分离效果,最终可以得到体积分数大于99.98%的TMS。     

把它们就地正法

听刘老师的课越久,同学们也越来越相信,刘老师掌握着许多神秘好玩的学习方法,谁要是能把它们都学到手,那么数学考试一定能得高分。不过大家也都变得有点儿怕他,担心自己的学习不能让他满意,这点好像和以前的江老师不一样呢。就像今天,刘老师眉头紧锁地走进教室,他一句话都还没说呢,就先叹了一口气,这下大家紧张了。刘老师转过身,在黑板上写下了一行     

钯催化溴代酚的[2+2+1]去芳构螺环化反应

在零价钯的催化作用下,以简单且商品化的溴代苯酚为研究目标,炔烃作为偶联片段,通过[2+2+1]反应策略,实现了苯酚的去芳构螺环化转化,合成了一系列新颖的含有季碳中心的螺环骨架化合物.该方法采用的底物简单易得,具有宽泛的底物范围,并且可以获得较优的收率;在非对称炔烃方面,能以优异的区域选择性(19∶1rr)实现这一转化,极大地拓宽了苯酚去芳构化的研究范围.     

Understanding the battery safety improvement enabled by a quasi-solid-state battery design

The rapid development of lithium-ion batteries (LIBs) is faced with challenge of its safety bottleneck, calling for design and chemistry innovations. Among the proposed strategies, the development of solid-state batteries (SSBs) seems the most promising solution, but to date no practical SSB has been in large-scale application. Practical safety performance of SSBs is also challenged. In this article, a brief review on LIB safety issue is made and the safety short boards of LIBs are emphasized. A systematic safety design in quasi-SSB chemistry is proposed to conquer the intrinsic safety weak points of LIBs and the effects are accessed based on existing studies. It is believed that a systematic and targeted solution in SSB chemistry design can effectively improve the battery safety, promoting larger-scale application of LIBs.     

Transport of Ca^2＋ Ion through a Bubbling Pseudo—emulsion Liquid Membrane with Calixarenes and Calixcrowns as Carriers

ＩｎｔｒｏｄｕｃｔｉｏｎＣａｌｉｘａｒｅｎｅｓｃｏｎｓｔｉｔｕｔｅａｖｅｒｓａｔｉｌｅｃｌａｓｓｏｆｍａｃｒｏｃｙｃｌｉｃｃｏｍｐｏｕｎｄｓｔｈａｔｃａｎｂｅｅａｓｉｌｙｆｕｎｃｔｉｏｎａｌｉｚｅｄ ,ｔｈｕｓａｆｆｏｒｄ ｉｎｇａｌａｒｇｅｖａｒｉｅｔｙｏｆｎｅｗｍｕｌｔｉｆｕｎｃｔｉｏｎａｌｒｅｃｅｐｔｏｒｓ .1Ｉｎｔｈｅｐａｓｔｔｗｏｄｅｃａｄｅｓ ,ｔｈｅｙｈａｖｅｐｌａｙｅｄａｎｉｍｐｏｒｔａｎｔｒｏｌｅｉｎｓｕｐｒａｍｏｌｅｃｕｌａｒｃｈｅｍｉｓｔｒｙａｓｕｓｅｆｕｌｂｕｉｌｄｉｎｇｂｌｏ…     

紫外光固化胶衣树脂

间苯二甲酸;不饱和聚酯树脂;紫外光固化胶衣树脂     

N-甲基丙烯酰-N′-嘧啶基哌嗪及其聚合物敏化的丙烯腈光聚合

The photopolymerization of acrylonitrile (AN) sensitized by N-methacrylyl-N'-pyrimidi-nopiperazine (MPMP) and its polymer, P(MPMP) was studied kinetically. It was found that the photopolymerization rate of AN sensitized by monomeric MPMP is proportional to 0.35th power of MPMP concentration and 0.85th power of AN concentration, respectively. In the case sensitized by Polymeric MPMP, P(MPMP) is proportional to 0.30th power of P(MP-MP) concentration and 1.0 power of AN concentration, respectively. The overall activation energies for photopolymerization sensitized with MPMP and P(MPMP) were determined to be 4.71Kcal/mol and 4.58Kcal/mol,respectively.From the fluorescence analysis for P(AN) senstitized by either MPMP or P(MPMP),it was confirmed that MPMP and P(MPMP) not only sensitized the photopolymerization of AN but also entered into the P(AN) chains.