Supramolecular poly(ether ketone)–polyisobutylene pseudo‐block copolymers

Abstract

The association behavior of telechelic hydrogen‐bonded poly(ether ketone) (PEK) and polyisobutylene (PIB) polymers and the formation of a new class of pseudo‐block copolymers is reported. The attachment of complementing hydrogen bonds (thymine/2,6‐diaminotriazine and cytosine/2,6‐diaminotriazine) onto the respective PIB and PEK polymers leads to a dramatic increase in the miscibility between the normally immiscible PEK and PIB polymers. The structure formation in the liquid state was studied by dynamic NMR spectroscopy as well as in the solid state via solid‐state NMR‐spectroscopy, DSC, and TEM methods. The polymers form a nanophase structure with a periodicity of 70 nm with the microphase separation occurring specifically within the donor–acceptor pair with the higher binding constant (thymine/2,6‐diaminotriazine) and not within the weaker bonded cytosine/2,6‐diaminotriazine pair. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 162–172, 2004

Olefin metathesis and quadruple hydrogen bonding: A powerful combination in multistep supramolecular synthesis

“…Such a material requires immiscible polymeric components, in which macrophase separation is prevented by strong and complementary noncovalent bonds between the telechelic blocks. Telechelic polymers with multiple H-bonding endgroups have been prepared by means of postpolymerization modification routes (14)(15)(16)(17)(18)(19)(20)(21)(22). However, incomplete reaction leads to small, yet detrimental, amounts of monofunctionalized polymers, which act as chain stoppers.…”

Polymers with Multiple Hydrogen-Bonded End Groups and Their Blends

“…The polymers themselves often have broad molecular weight distributions or high T g s, necessitating melt annealing at temperatures high enough to significantly reduce the strength of the hydrogen bond. Despite these limitations, the incorporation of both homocomplementary 3,4,6,19 and heterocomplementary 14,16,[20][21][22][23][24] MHB groups at polymer chain ends has been previously demonstrated. In particular, the work of Mather et al 21 first demonstrated the incorporation of MHB chain ends through the use of controlled radical polymerization from uracilfunctional nitroxide initiators.…”

Phase Behavior of Complementary Multiply Hydrogen Bonded End-Functional Polymer Blends

“…19 The nature of the interaction varies widely and most commonly consists of either metal-ligand, 20,21 ionic, 22,23 or hydrogen bonding. 24,25 Incorporation of these into various macromolecular architectures such as diblock, [26][27][28][29][30][31][32][33][34][35] triblock, [36][37][38] multiblock, [39][40][41] star 42 and graft copolymers, [43][44][45] blends, 35,46 and gels 47,48 has resulted in remarkably simple thermal control over the polymer structure and related properties.…”