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| 1 | 三茂基稀土和二乙胺基乙硫醇双组分体系催化己内酯开环聚合显示文摘研究了双组分体系Cp3Ln/HSCH2CH2NEt2(Ln=Sm,Yb)催化ε-己内酯聚合反应性能,并与Cp3Ln/HOCH2CH2NMe2和Cp3Ln(Ln=Sm,Yb)催化结果进行了比较,发现催化活性:Cp3Yb/HOCH2CH2NMe2>Cp3Sm/HOCH2CH2NMe2>Cp3Yb/HSCH2CH2NEt2>Cp3Sm/HSCH2CH2NEt2>Cp3Sm>Cp3Yb。发现Cp3Ln(Ln=Sm,Yb)和HSCH2CH2NEt2是通过可逆平衡反应生成相应茂基稀土硫化物的,硫醇的加入可提高Cp3Ln的催化活性。Cp3Ln(Ln=Sm,Yb)和HOCH2CH2NMe2反应则立即完全生成茂基稀土烷氧化合物。测定了[Cp2Sm(μ-OCH2CH2NMe2)]2的晶体结构。 | 张曼曼 袁福根 徐闻雅 顾章海 | 2013 | 中国稀土学报2013，31，6： | 1 |
| 2 | n-Octyloxyallene homopolymerization and random copolymerization with styrene using catalyst system composed of lanthanide Schiff-base complexes and Al(i-Bu)_3显示文摘The catalyst system composed of lanthanide Schiff-base complexes with [3,5-tBu2 -2-(O)C6H2 CH=NC6H5]3 Ln(THF)(Ln(Salen)3 , Ln = Sc, Y, La, Nd, Sm, Gd, Yb) and triisobutyl aluminum shows high activity for n-octyloxyallene (A) homopolymerization with narrow molecular weight distribution (MWD). The influences of reaction conditions on polymerization behavior are investigated, and poly(n-octyloxyallene) has a weight average molecular weight (M w ) of 20.6 × 10 3 with MWD of 1.39 and 100% yield is obtained under the optimum conditions: [Al]/[Y] = 50 mol/mol, [A]/[Y] = 100 mol/mol, with polymerization at 80 ℃ for 16 h in bulk. The kinetic studies of n-octyloxyallene homopolymerization indicate that the polymerization rate is first-order with respect to the monomer concentration and shows some controlled polymerization characteristics. Random copolymer of n-octyloxyallene with styrene is obtained by using the same binary catalyst system; the reactivity ratios of the comonomer determined by Kelen Tüd s method are r A = 1.20 and r St = 0.35, respectively, the ratio of each segment and M w of the resulting copolymer could be controlled by varying the feed ratio of each monomer. Determined by differential scanning calorimetry, the copolymers obtained show only one glass transition temperature, which increases gradually with the increase of styrene content in the copolymer. | JIAO JunQing ZHU WeiWei NI XuFeng SHEN ZhiQuan | 2013 | Science China Chemistry2013，56，7： | 0 |
| 3 | ^1三(2,6-二叔丁基芳氧基)镧催化ε-己内酯开环聚合显示文摘研究了单组分三(2,6-二叔丁基芳氧基)镧[La(ODTBP)3]催化己内酯(ε-CL)开环聚合,探索了反应条件对聚合反应的影响.实验结果表明,La(ODTBP)3在甲苯溶剂中能有效地催化ε-CL均聚合,并在适宜的条件下,可制得数均分子量为18.5×104,转化率为99.4%的聚己内酯(PCL).用GPC,DSC和1HNMR为主要分析手段对聚合物结构进行表征.分析结果显示ε-CL在La(ODTBP)3的催化下以'配位-酰氧键断裂-插入'机理进行. | 沈丽娟 曲丹 王艳 | 2011 | 陕西师范大学学报(自然科学版)2011，39，1： | 0 |
| 4 | 稀土化合物催化ε-己内酯的开环聚合反应的研究进展显示文摘聚ε-己内酯因其具有低毒、生物降解性的特质而被广泛应用于医学领域。综述了不同类型的稀土化合物催化ε-己内酯开环聚合反应的特征及反应机理。 | 牛延慧 | 2008 | 贵州教育学院学报2008，24，6： | 0 |
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