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国家自然科学基金(21174121)

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相关作者:李欣倪旭峰沈之荃更多>>
相关机构:浙江大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
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稀土胺基双酚配合物的合成及其催化己内酯开环聚合机理研究
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洪侃王莉容倪旭峰沈之荃
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Synthesis and Characterization of N-Heterocyclic Carbene Bis(phenolate) Lanthanide Complexes and Their Applications in Ring Opening Polymerization of L-Lactide
<正>N-heterocyclic carbene transition-metal complexes have exhibited remarkable success in the areas such as me...
Min Zhang倪旭峰Zhiquan Shen
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n-Octyloxyallene homopolymerization and random copolymerization with styrene using catalyst system composed of lanthanide Schiff-base complexes and Al(i-Bu)_3
2013年
The catalyst system composed of lanthanide Schiff-base complexes with [3,5-tBu2-2-(O)C6H2CH=NC6Hs]3Ln(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 in- vestigated, and poly(n-octyloxyallene) has a weight average molecular weight (Mw) of 20.6 ~ 103 with MWD of 1.39 and 100% yield is obtained under the optimum conditions: [A1]/[Y] = 50 mol/mol, [A]/[Y] = 100 mol/mol, with polymerization at 80 ~C 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 co- polymer of n-octyloxyallene with styrene is obtained by using the same binary catalyst system; the reactivity ratios of the comonomer determined by Kelen-Ttld/Ss method are rA = 1.20 and rst = 0.35, respectively, the ratio of each segment and Mw 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 JunQingZHU WeiWeiNI XuFengSHEN ZhiQuan
关键词:STYRENELANTHANIDESCHIFF-BASE
Sc(P_(204))_3/烷基铝体系催化降冰片烯聚合
2012年
以钪的膦酸酯盐Sc(P204)3和烷基铝组成催化体系催化降冰片烯(NBE)聚合,考察了聚合反应条件对单体转化率、产物分子量以及微观结构的影响.当以三乙基铝为助催化剂时,[NBE]/[Sc]=50(摩尔比),[Al]/[Sc]=30(摩尔比),40℃陈化5 min,在甲苯中于60℃聚合7 h,单体转化率为98%,所得聚合物可部分溶于有机溶剂;NBE以开环聚合方式为主,开环产物含量为81%~88%,其中顺式双键含量为48%~58%,分子量2.4×103~3.0×103,分子量分布1.9~2.2.当以三异丁基铝为助催化剂时,[NBE]/[Sc]=50(摩尔比),[Al]/[Sc]=5(摩尔比),50℃陈化2 h,80℃下于甲苯中聚合4 h,单体转化率为39%,所得白色聚合产物很难溶于有机溶剂,以开环聚合方式为主,产物中反式双键含量90%.
李欣倪旭峰沈之荃
关键词:降冰片烯开环易位聚合加成聚合
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