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| 001 | 821019 | ||
| 005 | 20240619091217.0 | ||
| 024 | 7 | _ | |a 10.1021/acs.macromol.6b00978 |2 doi |
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| 100 | 1 | _ | |a Staropoli, Mariapaola |0 P:(DE-Juel1)162139 |b 0 |e Corresponding author |u fzj |
| 245 | _ | _ | |a Hydrogen Bonding in a Reversible Comb Polymer Architecture: A Microscopic and Macroscopic Investigation |
| 260 | _ | _ | |a Washington, DC |c 2016 |b Soc. |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1480488166_25250 |2 PUB:(DE-HGF) |
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| 336 | 7 | _ | |a Journal Article |0 0 |2 EndNote |
| 520 | _ | _ | |a In this work, an investigation of the hydrogen-bonding mechanism in a transiently branched comb-like polymer system in the melt is reported. The system under investigation consists of a polybutylene oxide (PBO)-based backbone, randomly functionalized with thymine (thy) groups, in combination with shorter PBO graft chains, end-functionalized with diaminotriazine (DAT) groups. The functional groups are able to associate through hydrogen bonding. The heterocomplementary association of these groups leads to the formation of a transiently branched comb-like polymer system. Since recently virtually exclusive heterocomplementary association could be observed in the supramolecular association of telechelically modified oligomeric PEG chains, here we aim to extend the supramolecular assembly mechanism toward branched structures. The present work combines small angle neutron scattering (SANS) experiments on a selectively labeled system with macroscopic dynamics measured in linear rheology response. The association of thy- and DAT-modified components was studied as a function of temperature and composition. The scattering function reveals the formation of a block copolymer and can be exclusively attributed to heterocomplementary association of the hydrogen-bonding groups. Scattering functions of nonfunctionalized blends are also reported as references and evidence the change in the microstructure induced by the heterocomplementary association. All scattering profiles were described by means of the random phase approximation (RPA) formalism from which the average aggregation number, i.e., comb arm functionality and the equilibrium association constant could be determined directly in the melt state as a function of temperature. On the other hand, rheological measurements were performed in the melt state to study the influence of the reversible bonds on the macroscopic dynamics of the polymer system. The rheology data are in good agreement with the SANS results and confirm the transient comb-like branched architecture. The supramolecular association exhibits characteristic bonding times of the groups in the order of 1 s at −25 °C and therefore makes the thy–DAT pair an ideal candidate for the development of responsive materials that combine permanent and transient linkages for novel applications and self-healing properties. |
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| 773 | _ | _ | |a 10.1021/acs.macromol.6b00978 |g Vol. 49, no. 15, p. 5692 - 5703 |0 PERI:(DE-600)1491942-4 |n 15 |p 5692 - 5703 |t Macromolecules |v 49 |y 2016 |x 1520-5835 |
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