Alternating Ring-Opening Metathesis Polymerization (AROMP) of Hydrophobic and Hydrophilic Monomers Provides Oligomers with Side-Chain Sequence Control
Alternating Ring-Opening Metathesis Polymerization (AROMP) of Hydrophobic and Hydrophilic Monomers Provides Oligomers with Side-Chain Sequence Control
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DOI：
10.1021/acs.macromol.8b00562
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发表时间：
2018-06-12
期刊：
影响因子：
5.5
通讯作者：
Sampson, Nicole S.
中科院分区：
文献类型：
--
作者：
Li, Guofang;Sampson, Nicole S.
我们报告的形成低聚物的侧链序列控制，使用氯离子催化的交替开环易位聚合（AROMP）。这些低聚物通过在85 ℃下连续化学计量加成双环[4.2.0]辛-1（8）-烯-8-carB草酰胺（单体A）和在45 ℃下加成环己烯（单体B）以产生由（A-alt-B）（n）和（A ′-alt-B）（n）微嵌段组成的至多24个单体单元的序列来制备，其中n的范围为1至6。在本文中，单体A具有烷基侧链，并且单体A'具有甘氨酸甲酯侧链。增加微块大小从一个到六个结果在增加水的接触角旋涂薄膜，尽管亲水和疏水部分的恒定比例。然而，当n等于2时，观察到不成比例的高接触角。因此，在双环[4.2.0]辛-1（8）-烯-8-甲酰胺和环己烯的AROMP中形成的独特的全碳骨架为具有特定侧链序列的材料的非模板制备提供了平台。
We report the formation of oligomers with side-chain sequence control using ruthenium-catalyzed alternating ring-opening metathesis polymerization (AROMP). These oligomers are prepared through sequential, stoichiometric addition of bicyclo [4.2.0] oct-1 (8)-ene-8-carb oxamide (monomer A) at 85 degrees C and cyclohexene (monomer B) at 45 degrees C to generate sequences up to 24 monomeric units composed of (A-alt-B)(n) and (A'-alt-B)(n) microblocks, where n ranges from 1 to 6. Herein, monomer A has an alkyl side chain, and monomer A' has a glycine methyl ester side chain. Increasing microblock size from one to six results in an increasing water contact angle on spin-coated thin films, despite the constant ratio of hydrophilic and hydrophobic moieties. However, a disproportionately high contact angle was observed when n equals 2. Thus, the unique all-carbon backbone formed in the AROMP of bicyclo[4.2.0]oct-1(8)-ene-8-carboxamides and cyclohexene provides a platform for the non-templated preparation of materials with specific sequences of side chains.