Steric hindrance affects interactions of poly(styrene–alt–DMHPMI) copolymer with strongly hydrogen-bond-accepting homopolymers

Construction of micelles and hollow spheres via the self-assembly behavior of poly(styrene-alt-pHPMI) copolymers with poly(4-vinylpyridine) derivatives mediated by hydrogen bonding interactions

“…After the addition of poly(S-alt-pHPMI) alternating copolymers, we observed the hydrogen-bonded pyridine ring at 1005 cm À1 , which has been widely discussed in previous studies. 19,20 This result indicates that hydrogen bonding occurred between the P4VP shell and the poly(S-alt-pHPMI) core, as expected. Second, the intensity of absorption peaks at 2926 cm À1 (C-H stretching) increased, indicating that the P4VP shell was crosslinked with 1,4-dibromobutane to produce the [-(Py)CH-CH 2 -CH(Py)-] backbone, [34][35][36] while the intensity of absorption peaks at 1005 cm À1 decreased, indicating that the hydrogen-bonded pyridine rings on the P4VP shell were replaced with crosslinked pyridine rings (Fig.…”

“…Prior to the polymerization, the monomers and solvents were dried with CaH 2 overnight and distilled under vacuum. In addition, a poly(S- alt-p HPMI) alternating copolymer, 19 a P4VP homopolymer, 20 and a PS 68 - b -P4VP 32 diblock copolymer 22 have been synthesized previously in our previous works.…”

“…3(c)). 19,20 A new peak at 1665 cm À1 (CQN + stretching) appeared, suggesting that the poly(S-alt-pHPMI) core was thoroughly washed with DMF to form hollow spheres. 37 The reason for the poly(S-alt-pHPMI) core being thoroughly washed out by DMF is the stronger intermolecular hydrogen bonding interaction between the hydroxyl groups in DMF and the maleimide units in poly(S-alt-pHPMI) compared to the hydrogen bonding interaction between the hydroxyl groups and pyridine units.…”

“…19 Besides, our previous report has showed that the intermolecular hydrogen bonding interactions of poly(S-alt-pHPMI)/P4VP binary blends were weak compared to poly(S-alt-pHPMI)/PVP binary blends. [19][20][21] Thus, we also selected homopolymer P4VP as a polymeric micelle corona, except to obtain sphere-like micelle structures. Subsequently, we synthesized a random copolymer, PS 41 -r-P4VP 59 , via free radical polymerization and a block copolymer, PS 68 -b-P4VP 32 , via anionic living polymerization.…”

Regulating the self‐assembly of AB/CD diblock copolymer blends via secondary interactions

“…In experiments, the attraction between two blocks could be realized via the association of different functional groups such as hydrogen bonding and electrostatic interaction, [61][62][63] and the strength of the attractive interaction could be adjusted by, for example, the density of hydrogen bonding units 64 and the steric effects. 65,66 The principles obtained from our theoretical study could be used to guide experiments and also serves as a starting point for future studies on the phase behaviors of polymeric blends with designed secondary interactions.…”