Raspolli Galletti Anna Maria, Pampaloni Guido, D'Alessio Aldo, Patil Yogesh, Renili Filippo, Giaiacopi Simone
Dipartimento di Chimica e Chimica Industriale, University of Pisa, via Risorgimento 35, 56126 Pisa, Italy.
Macromol Rapid Commun. 2009 Oct 19;30(20):1762-8. doi: 10.1002/marc.200900248. Epub 2009 Jul 27.
Ring-opening metathesis polymerization (ROMP) of norbornene catalyzed by niobium(V) N,N-dialkylcarbamates Nb(O(2) CNR(2) )(5) , R = Et (1), Me (2) was studied in the presence of methylaluminoxane (MAO) as a cocatalyst. These novel catalytic systems resulted very active in chlorobenzene: 1 in the presence of methylaluminoxane catalyzes the ROMP of norbornene with the highest activity (29 000 kg of polymer/mol of catalyst × hour) never reported up to now for niobium catalysts. The high productivity appears particularly attractive considering that these precursors are rather cheap and easy to synthesize and to handle. Polynorbornenes were characterized by FT-IR and NMR spectroscopies and by DSC calorimetry. A new FT-IR method for the swift determination of the cis/trans content of the polymer is presented.
研究了在助催化剂甲基铝氧烷（MAO）存在下，由铌（V）N，N-二烷基氨基甲酸盐Nb（O₂CNR₂）₅（R = Et（1），Me（2））催化的降冰片烯的开环易位聚合（ROMP）反应。这些新型催化体系在氯苯中表现出很高的活性：在甲基铝氧烷存在下，1催化降冰片烯的ROMP反应，具有迄今为止铌催化剂从未报道过的最高活性（29000 kg聚合物/（催化剂·摩尔·小时））。考虑到这些前体相当便宜且易于合成和处理，其高生产率显得特别有吸引力。聚降冰片烯通过傅里叶变换红外光谱（FT-IR）、核磁共振光谱（NMR）和差示扫描量热法（DSC）进行了表征。提出了一种快速测定聚合物顺式/反式含量的新FT-IR方法。
