Spacer-Length-Dependent Association in Polymers with Multiple-Hydrogen-Bonded End Groups

作者：De Greef Tom F A; Kade Matthew J; Feldman Kathleen E; Kramer Edward J; Hawker Craig J^*; Meijer E W

来源：Journal of Polymer Science Part A: Polymer Chemistry , 2011, 49(19): 4253-4260.

DOI：10.1002/pola.24868

• atom transfer radical polymerization (ATRP)
• diffusion-ordered spectroscopy
• hydrogen bonding
• supramolecular diblock copolymers

Herein, we investigate the influence of spacer length on the homoassociation and heteroassociation of end-functionalized hydrogen-bonding polymers based on poly(n-butyl acrylate). Two monofunctional ureido-pyrimidinone (UPy) end-functionalized polymers were prepared by atom transfer radical polymerization using self-complementary UPy-functional initiators that differ in the spacer length between the multiple-hydrogen-bonding group and the chain initiation site. The self-complementary binding strength (K-dim) of these end-functionalized polymers was shown to depend critically on the spacer length as evident from H-1 NMR and diffusion-ordered spectroscopy. In addition, the heteroassociation strength of the end-functionalized UPy polymers with end-functionalized polymers containing the complementary 2,7-diamido-1,8-naphthyridine (NaPy) hydrogen-bond motif is also affected when the aliphatic spacer length is too short.

• 出版日期2011-10-1