Aluminoxane-based Activator Chemistry

基于铝氧烷的活化剂化学

• 批准号: 478998-2015
• 负责人: McIndoe, Scott
• 金额: $ 7.69万
• 依托单位: University of Victoria
• 依托单位国家: 加拿大
• 项目类别: Strategic Projects - Group
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=599862
• 关键词: Aluminoxane; based; Activator; Chemistry

Plastics are versatile materials used in an enormous array of products. Polyolefins are one class of plastics made from polymerizing olefin monomers (simple molecules containing a C=C double bond) to form a long chain hydrocarbon (with a backbone of C-C single bonds). They are made in huge quantity worldwide with the help of catalysts. Catalysts speed chemical reactions without themselves being affected, and in the preparation of polyolefins, catalysts containing transition metals are used. However, the catalyst requires activation before it is able to assist the desired transformation, and the key industrial approach to this activation step is to use a large excess of a highly reactive compound called methylaluminoxane (MAO). The excess used is so high (1000-10,000 equivalents) that MAO represents a significant proportion of the cost of the catalytic system. The excess used is probably due to the fact that the activating component(s) of MAO are present only as a small fraction of the whole, but the complexity of MAO is such that it has resisted unambiguous characterization for over 25 years.

塑料是一种用途广泛的材料，用于大量的产品。聚烯烃是由烯烃单体(含C=C双键的简单分子)聚合形成长链碳氢化合物(以C-C单键为骨架)制成的一类塑料。在催化剂的帮助下，它们在世界各地大量生产。催化剂加速化学反应而本身不受影响，在聚烯烃的制备中，使用含有过渡金属的催化剂。然而，催化剂需要活化才能协助所需的转化，而这一活化步骤的关键工业方法是使用大量的高活性化合物，称为甲基铝氧烷(MAO)。过量使用量如此之高(1000-10,000当量)，以至于MAO在催化系统的成本中占了相当大的比例。大量使用可能是因为MAO的激活成分(S)只作为整体的一小部分存在，但MAO的复杂性使得它在超过25年的时间里一直拒绝明确的定性。