An efficient avenue to poly(styrene)‐block‐poly(ε‐caprolactone) polymers via switching from RAFT to hydroxyl functionality: Synthesis and characterization

An efficient avenue to poly(styrene)‐block‐poly(ε‐caprolactone) polymers via switching from RAFT to hydroxyl functionality: Synthesis and characterization
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通过从 RAFT 切换到羟基官能团来制备聚(苯乙烯)-嵌段-聚(ε-己内酯)聚合物的有效途径:合成和表征

DOI:
10.1002/pola.24299
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发表时间:
2011
期刊:
Journal of Polymer Science Part A
影响因子:
--
通讯作者:
Barner-Kowollik
Barner-Kowollik
中科院分区:
--
文献类型:
--
作者:
Schmid;Falkenhagen;Barner-Kowollik

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采用最近引入的将硫代羰基硫封端(RAFT)聚合物定量转换为羟基封端物质的方法来产生窄多分散性(PDI ≥ 1.2)的无硫聚(苯乙烯)-嵌段-聚(ε-己内酯)聚合物(26,000 ≤Mn/g·mol−1<45,000)。以1,5,7-三氮杂双环[4.4.0]癸-5-烯(TBD)为催化剂,进行了ε-己内酯(ε-CL)的开环聚合。通过尺寸排阻色谱法(SEC)、NMR以及与SEC偶联的临界条件下的液体吸附色谱法(LACC-SEC)彻底分析所获得的嵌段共聚物,以证明嵌段共聚物结构和合成方法的效率。目前的贡献表明,RAFT方法可以作为一种方法,用于通过有效的端基转换生成无硫嵌段共聚物。© 2010 Wiley Periodicals,Inc. J Polym Sci A部分:Polym Chem,2010
The recently introduced procedure of quantitatively switching thiocarbonyl thio capped (RAFT) polymers into hydroxyl terminated species was employed to generate narrow polydispersity (PDI≈ 1.2) sulfur‐free poly(styrene)‐block‐poly(ε‐caprolactone) polymers (26,000 ≤Mn/g·mol−1< 45,000). The ring‐opening polymerization (ROP) of ε‐caprolactone (ε‐CL) was conducted under organocatalysis employing 1,5,7‐triazabicyclo[4.4.0]dec‐5‐ene (TBD). The obtained block copolymers were thoroughly analyzed via size exclusion chromatography (SEC), NMR, as well as liquid adsorption chromatography under critical conditions coupled to SEC (LACCC‐SEC) to evidence the block copolymer structure and the efficiency of the synthetic process. The current contribution demonstrates that the RAFT process can serve as a methodology for the generation of sulfur‐free block copolymers via an efficient end group switch. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010
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