Heteropolyacids — new efficient initiators of cationic polymerization
Heteropolyacids — new efficient initiators of cationic polymerization
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DOI：
10.1002/macp.1989.021900502
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发表时间：
1989-05
影响因子：
2.5
通讯作者：
M. Bednarek;K. Brzezinska;Jacek Stasiński;P. Kubisa;S. Penczek
中科院分区：
文献类型：
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作者：
M. Bednarek;K. Brzezinska;Jacek Stasiński;P. Kubisa;S. Penczek
我们发现，杂多酸（HPA）是阳离子聚合的有效引发剂，包括环醚和缩醛的聚合，提供高分子量聚合物。在一些系统（例如THF、1,3-二氧戊环）中，聚合度由单体和引发剂的浓度比给出，对于活性系统而言。在环状甲醛三聚体：1,3,5-三恶烷的聚合中，与典型引发剂如BF3·OR2相比，以重量计约25倍的引发剂消耗（以摩尔计约103倍的引发剂消耗）可获得相当的聚合速率。
We have found, that heteropolyacids (HPA) are efficient initiators of cationic polymerizations, including polymerizations of cyclic ethers and acetals, providing high-molecular-weight polymers. In several systems (e. g. THF, 1,3-dioxolane) the degree of polymerization is given by the ratio of concentrations of monomer and initiator, as for the living system. In the polymerization of cyclic formaldehyde trimer: 1,3,5-trioxane, the comparable polymerization rates may be obtained with ≈ 25 times less an initiator consumption on weight basis (≈ 103 times less on molar basis) than for typical initiators like BF3 · OR2.