Iron-mediated AGET ATRP of styrene and methyl methacrylate using ascorbic acid sodium salt as reducing agent

Atom transfer radical polymerization of styrene(St) and methyl methacrylate(MMA) in bulk and in different solvents using activators generated by electron transfer(AGET ATRP) were investigated in the presence of a limited amount of air using FeCl3·6H2O as the catalyst, ascorbic acid sodium salt(AsAc-Na) as the reducing agent, and a cheap and commercially available tetrabutylammonium bromide(TBABr) as the ligand. It was found that polymerization in THF resulted in shorter induction period than that in bulk and in toluene for AGET ATRP of St, while referring to AGET ATRP of MMA, polymerization in THF showed three advantages compared with that in bulk and toluene: 1) shortening the induction period, 2) enhancing the polymerization rate and 3) having better controllability. The living features of the obtained polymers were verified by chain end analysis and chain-extension experiments.     

N-取代丙烯酰胺的等离子体引发聚合及聚合物性能研究

温敏树脂;N取代丙烯酰胺的等离子体引发聚合及聚合物性能研究     

微波辐射下甲基丙烯酸正丁酯原子转移自由基聚合

原子转移自由基聚合(Atom transfer radical polymerization,ATRP)与其他活性聚合方法相比,具有适用单体广、反应条件温和。但其催化体系活性不高,聚合温度较高,数均分子量不高。     

微波辐射下固相反应合成二苯基甲基醚

在常压下用微波辐射固相反应的方法合成了二苯基甲基醚,与用有机溶剂为介质及传统的热固相反应方法相比,其反应速率快,产率高。     

丙烯酸十六酯与丙烯酸共聚物凝胶的合成及其性能

合成了丙烯酸十六酯(HA)与丙烯酸(AA)的共聚物凝胶，研究了共聚组成对共聚物凝胶性能的影响。结果表明：经二甲亚砜(DMSO)平衡溶胀后的凝胶，在HA与AA的物质的量比为1：1时，具有较高的规整性。溶剂的极性对聚合物凝胶的规整性有较大的影响。DSC及X射线衍射表明共聚物凝胶具有液晶性能。     

苯乙烯与富马酸二甲酯的原子转移自由基无规共聚

2-溴丙酸乙酯(EBP)为引发剂，CuBr为催化剂，N，N，N′，N″，N″-五甲基二亚乙基三胺(PMDETA)为配位剂的富马酸二甲酯(DMF)与苯乙烯(St)的原子转移自由基无规共聚合，转化率低于60％时，1n([M]0／[M])随聚合时间线性增加，数均分子量(Mn)随转化率性增长，所得聚合物分子量分布(PDI)较窄。根据元素分析所得共聚物的平均组成，由Kelerr—Tudos方程，计算两种共聚单体的竞聚率分别是rst=0．488，rDMF=0．303。并探讨了单体与引发剂配比以及温度对聚合反应的影响。     

Synthesis and Crystal Structure of N,N''''-Dimethyldithio-arbamato-Copper(I) Polymer {[Cu(Me_2dtc)]_2}_n

Introduction In recent years, metal dithiocarbamate complexesremain attractive because of their possible relevance tothe nature of the sulfur-metal bond in some bimole-cules1 and their potential biological role in anti-alkyla-tion and cancer disease treatment.2 Among them, cop-per(II) dithiocarbamate complexes have been exten-sively investigated due to their rich structural magnetic,and electrochemical properties.3 However, the chemistryof copper(I) complexes of dithiocarbamates seems lesse…     

钙钛矿薄膜气相制备的晶粒尺寸优化及高效光伏转换

钙钛矿薄膜的气相制备是一种极具潜力的工业化生产工艺,但薄膜的质量控制目前远落后于溶液制备法.本文通过建立PbI_2薄膜向钙钛矿薄膜完全转化过程中反应时间、晶粒尺寸与温度的关系,实现了薄膜的质量优化及大面积钙钛矿薄膜的制备,将薄膜的平均晶粒粒径从0.42μm优化到0.81μm.基于空间电荷限制电流模型对缺陷密度的研究显示,钙钛矿薄膜的缺陷密度由5.90×10~(16)cm~(–3)降低到2.66×10~(16)cm~(–3).光伏器件(FTO/TiO_2/C_(60)/MAPbI_3/spiro-OMeTAD/Au结构)测试显示,面积为0.045cm~2器件的平均光电转换效率从14.00%提升到17.42%,最佳光电转换效率达到17.80%,迟滞因子减小至4.04%.同时,基于180℃制备的1cm~2器件的光电转换效率达到13.17%.     

Photo-induced Living Cationic Copolymerization of Isobutyl Vinyl Ether and Vinyl Ether with Carbazolyl Groups

In this work, a fluorescent monomer 2-（9-carbazolyl） ethyl vinyl ether（CEVE） was synthesized in our lab, and its photo-induced living cationic copolymerization behavior with isobutyl vinyl ether（IBVE） was investigated in detail using diphenyliodonium chloride（DPICl）/2,2-dimethoxy-2-phenylacetophenone（DMPA） and zinc bromide（Zn Br2） initiating system in dichloromethane solution at 5 °C, -5 °C, and -15 °C, respectively. The living nature of this copolymerization system was confirmed by adding fresh comonomer method after the copolymerization almost finished. In addition, the obtained fluorescent copolymer poly（IBVE-co-CEVE） has a low glass transition temperature（Tg）, below -10 °C.     

氮氧自由基调控下苯乙烯的活性自由基聚合

本文用亚磷酸三-(2,2,6,6-四甲基哌啶氮氧自由基)酯(PT3)作为稳定自由基,偶氮二异丁腈(AIBN)和四乙基秋兰姆(TETD)分别作为起始自由基引发剂引发苯乙烯在125℃聚合。实验结果表明：在两种自由基引发剂存在下,Pb都可以有效地控制苯乙烯的聚合,分子量随转化率线性增长,分子量分布控制在1．15-1．6。对AIBN和TETD聚合过程比较可以发现：TETD引发下的聚合速度快于AIBN的聚合速度,就分子量分布和分子量的控制而言,两者具有相拟的能力。用得到的大分子聚合物为引发剂戚功进行的扩链实验也证明在三臂聚合物中心的烷氧胺可以继续引发苯乙烯聚合。