Multi-Block Polyurethanes via RAFT End-Group Switching and Their Characterization by Advanced Hyphenated Techniques
Multi-Block Polyurethanes via RAFT End-Group Switching and Their Characterization by Advanced Hyphenated Techniques
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DOI：
10.1021/ma301117k
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发表时间：
2012-08
期刊：
影响因子：
5.5
通讯作者：
Christina Schmid;J. Falkenhagen;T. Beskers;L. Nguyen;M. Wilhelm;F. D. Prez;C. Barner‐Kowollik
中科院分区：
文献类型：
--
作者：
Christina Schmid;J. Falkenhagen;T. Beskers;L. Nguyen;M. Wilhelm;F. D. Prez;C. Barner‐Kowollik
本文对通过氨基甲酸酯键生成的聚苯乙烯-b-聚四氢呋喃（pS-b-pTHF）多嵌段共聚物（17800 g mol-1 ≤ Mn ≤ 46800 g mol-1）进行了详细的表征。嵌段共聚物的合成是通过聚（苯乙烯）的硫代羰基硫代端基到二羟基封端的聚合物的机械转换实现的，所述二羟基封端的聚合物随后与二异氰酸酯封端的基于聚四氢呋喃的预聚物反应以形成多嵌段共聚物结构。多嵌段共聚物及其亚结构的表征包括尺寸排阻色谱（SEC）、临界条件下的液相色谱（LCCC）、核磁共振（NMR）、红外（IR）光谱以及基质辅助激光解吸/电离（MALDI）质谱。为了获得聚合物尺寸及其组成的更进一步的细节，进行了具有三重检测的SEC以及新开发的在线耦合到IR光谱的SEC。平均血流量的量化。
The detailed characterization of poly(styrene)-b-poly(tetrahydrofuran) (pS-b-pTHF) multiblock copolymers (17800 g mol–1 ≤ Mn ≤ 46800 g mol–1) generated via urethane linkages is presented. The synthesis of the block copolymers is enabled via a mechanistic switch of the thiocarbonyl thio end group of a poly(styrene) to dihydroxyl terminated polymers that subsequently react with a diisocyanate terminated polytetrahydrofuran based prepolymer to form multiblock copolymer structures. The characterization of the multiblock copolymers and their substructures includes size exclusion chromatography (SEC), liquid chromatography at critical conditions (LCCC), nuclear magnetic resonance (NMR), and infrared (IR) spectroscopy as well as matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. To obtain even further details of the polymer size and its composition, SEC with triple detection as well as newly developed SEC coupled online to IR spectroscopy was carried out. The quantification of the average blo...