Insights into the Ring‐Expansion Polymerization of Thiiranes with 2,4‐Thiazolidinedione

Insights into the Ring‐Expansion Polymerization of Thiiranes with 2,4‐Thiazolidinedione
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深入了解硫杂环丙烷与 2,4â 噻唑烷二酮的环膨胀聚合

DOI:
10.1002/macp.201300213
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发表时间:
2013
影响因子:
2.5
通讯作者:
P. Vana
P. Vana
中科院分区:
化学4区
文献类型:
--
作者:
J.-H. Schuetz;L. Sandbrink;P. Vana

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研究了2-苯氧甲基-2,4-二酮(TZD)为环引发剂时,2-苯氧甲基硫烷(PMT)和硫化丙烷(PS)的扩环均聚合行为。聚合反应的摩尔质量随着单体转化率的增加而稳步增长。此外,还观察到环之间的可逆合并反应,形成了多达6个合并的大环。共聚程度强烈依赖于初始单体浓度,而温度的影响很小。在优化条件下,可合成Mn值高达50~250g·−~(-1)、分散度为1.11的环-聚(PMT)聚合物。DSC和ESI-MS测试表明,新型环状聚(PS)形成了拓扑纯度大于95%的环状聚合物。
The behavior of the ring‐expansion homopolymerization of 2 (phenoxymethyl)thiirane (PMT) and propylene sulfide (PS), respectively, with thiazolidine‐2,4‐dione (TZD) as a cyclic initiator is investigated. The polymerizations show steadily growing molar masses with increasing monomer conversions. In addition, reversible merging reactions between rings are observed, with up to six merged macrocycles formed. The degree of merging is strongly dependent on the initial monomer concentration, whereas temperature has only a small impact. Under optimized conditions,ring‐poly(PMT) polymer with values ofMnup to 50 250 g mol−1and dispersities down to 1.11 can be synthesized. DSC and ESI‐MS measurements of the novelring‐poly(PS) prove the formation of ring polymer having topological purity above 95%.
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