Accession Number:

ADA626337

Title:

Supramolecular Polymers with Orthogonal Functionality

Descriptive Note:

Journal article

Corporate Author:

CASE WESTERN RESERVE UNIV CLEVELAND OH

Report Date:

2014-12-11

Pagination or Media Count:

13.0

Abstract:

Supramolecular polymers with orthogonal interactions are of broad interest, and reports on such materials with multifunctional stimuli-responsive behavior are rare. Polymer blends based on a polyethylene-co-butylene core PEB terminated with either 2-ureido-41H-pyrimidinone UPy hydrogen-bonding motifs UPy-PEB-UPy or 2,6- bis1-methylbenzimidazolylpyridine Mebip ligands coordinated to metal ions MMebip-PEB-Mebip2 M Zn, Fe were prepared. The degree of orthogonality of the supramolecular polymer blends was explored by UVvis spectroscopy, small-angle X-ray scattering, and dynamic mechanical thermal analysis DMTA. Polymer blends of ZnMebip-PEB-MebipNTf22 and UPy-PEB-UPy resulted in a statistical mixture of noncovalent interactions, whereas blends with FeMebip-PEBMebipClO42 and UPy-PEB-UPy assembled in an orthogonal fashion. Additionally, the DMTA showed two transitions for the disassembly of UPy ca. 60 C and Fe2-Mebip ca. 180 C phases. The Fe2-Mebip interactions were selectively disrupted by the addition of a competitive ligand, demonstrating that each supramolecular motif can be targeted with either a thermal or chemical stimulus.

Subject Categories:

  • Polymer Chemistry
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE