Cooperative structure formation by combination of covalent and association chain polymers, 3. Control of association polymer chain length

Abstract

Thermoanalytical studies on an order-disorder transition resulting from supramolecular organization of hydrogen bond motifs in an unpolar (polymer-) matrix are reported. Functional groups having two potential sites for hydrogen bonding are located statistically along the polymer backbone. Multistep hydrogen bond formation leads to the formation of association chains whose lengths can be controlled by addition of monofunctional groups like in conventional stepgrowth polymers. The association chain length is estimated from the variation of transition enthalpy and 'melting' temperature.

Mechanism of Supramolecular Polymerizations

“…At the relatively large unimer concentration of 0.01 g/mL, M w /M 0 % 4. Similar low values of DP are evident upon consideration of the effective chain length calculated by Hilger and Stadler [101] for linear supramolecular polymers stabilized by single H-bonds in nonliquid crystalline phases. 18 refer to the association of the enzyme glutamate dehydrogenase and appear to conform to the theoretical prediction up to $1% concentration.…”

“…[5,20,[91][92][93][94][95] A general feature of excluded volume treatments is that the critical volume fraction is inversely related to the axial ratio of either a molecular or a supramolecular polymer. [101] A similar situation for the supramolecular polymer has not been described. 21 schematizing the expected variation of the length of the growing assembly with the concentration of unimers.…”

Rational Control of Viscoelastic Properties in Multicomponent Associative Polymer Networks

“…Each of the networks consists of 5% (by metal functional group per pyridine residue) of ([) 1a, (9) 1b,(2) 1c, and (b) 1d and PVP at 10% by total weight of network in DMSO at 20°C.…”

Hydrogen bonding and thermoplastic elastomers – a nice couple with temperature-adjustable mechanical properties

“…1). Compared to formerly investigated homopolymer systems, [18][19][20] our copolymer system exhibits markedly improved mechanical properties. The choice of styrenebutadiene copolymers additionally allows for the adjustment of the glass transition temperature and hence for the control of the mechanical properties of the polymer.…”