Synthesis and crossover reaction of TEMPO containing block copolymer via ROMP.

Synthesis and crossover reaction of TEMPO containing block copolymer via ROMP.
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DOI:
10.3762/bjoc.6.59
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发表时间:
2010-06-01
影响因子:
2.7
通讯作者:
Binder WH
Binder WH
中科院分区:
化学4区
文献类型:
--
作者:
Adekunle O;Tanner S;Binder WH

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本文报道了两种结构不同的异戊二烯单体(±)-内,外-双环[2.2.1]-庚-5-烯-2,3-二羧酸二甲酯(7)和(±)-内,外-双环[2.2.1]-庚-5-烯-2,3-二羧酸双使用钌基Grubbs型引发剂[(PCy 3)2Cl 2 Ru]的(1-氧基-2,2,6,6-四甲基-哌啶-4-基)酯(9)[(亚苄基)] G1(PCy 3 =三环己基膦),[(H2 IMes)(PCy 3)Cl 2 Ru(亚苄基)] G2(H2 IMes = 1,3-双(均三甲苯基)-2-咪唑烷亚基),[(H2IMes)(py)2Cl2Ru(亚苄基)] G3(py =吡啶或3-溴吡啶)和Umicore型引发剂[(PCy 3)2Cl 2 Ru(3-苯基茚-1-亚基)] U1(PCy 3 =三环己基膦),[(H2 IMes)(PCy 3)Cl 2 Ru(3-苯基茚-1-亚基)] U2(H2 IMes = 1,3-双(均三甲苯基)-2-咪唑烷亚基)、[(H2 IMes)(py)Cl 2 Ru(3-苯基茚-1-亚基)] U3(py =吡啶或3-溴吡啶)通过开环聚合(ROMP)。分别用基质辅助激光解吸电离质谱(MALDI-TOF)和核磁共振(NMR)研究了交叉反应和聚合动力学。MALDI表明,在加入25当量的第二单体后,存在完全的交叉反应。核磁共振研究表明,U3给出了一个更快的聚合速率相比,U1。报道了分子量为31000 g/mol的低多分散性(Mw/Mn = 1.2)嵌段共聚物的合成。
We report on the block copolymerization of two structurally different norbornene monomers (±)-endo,exo-bicyclo[2.2.1]-hept-5-ene-2,3-dicarboxylic acid dimethylester (7), and (±)-endo,exo-bicyclo[2.2.1]-hept-5-ene-2,3-dicarboxylic acid bis(1-oxyl-2,2,6,6-tetramethyl-piperidin-4-yl) ester (9) using ruthenium based Grubbs’ type initiators [(PCy3)2Cl2Ru(benzylidene)] G1 (PCy3 = tricyclohexylphosphine), [(H2IMes)(PCy3)Cl2Ru(benzylidene)] G2 (H2IMes = 1,3-bis(mesityl)-2-imidazolidinylidene), [(H2IMes)(py)2Cl2Ru(benzylidene)] G3 (py = pyridine or 3-bromopyridine) and Umicore type initiators [(PCy3)2Cl2Ru(3-phenylinden-1-ylidene)] U1 (PCy3 = tricyclohexylphosphine), [(H2IMes)(PCy3)Cl2Ru(3-phenylinden-1-ylidene)] U2 (H2IMes = 1,3-bis(mesityl)-2-imidazolidinylidene), [(H2IMes)(py)Cl2Ru(3-phenylinden-1-ylidene)] U3 (py = pyridine or 3-bromopyridine) via ring opening polymerization (ROMP). The crossover reaction and the polymerization kinetics were investigated using matrix assisted laser desorption ionization mass spectroscopy (MALDI-TOF) and nuclear magnetic resonance (NMR), respectively. MALDI showed that there was a complete crossover reaction after the addition of 25 equivalents of the second monomer. NMR investigation showed that U3 gave a faster rate of polymerization in comparison to U1. The synthesis of block copolymers with molecular weights up to Mn = 31 000 g/mol with low polydispersities (Mw/Mn = 1.2) is reported.
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影响因子: 5.5
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期刊: MACROMOLECULES
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