2000
DOI: 10.1002/1099-0488(20000715)38:14<1903::aid-polb90>3.0.co;2-p
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Hydrophobic and hydrophilic aggregation of tailor-made urethane acrylate anionomers in various solvents and their network structures

Abstract: Tailor‐made urethane acrylate anionomer (UAA) chains show higher viscosity and polyelectrolyte behavior in dimethyl sulfoxide (DMSO) than in water and toluene. Water is a nonsolvent for the hydrophobic soft segment but a good solvent for the hydrophilic hard segments, so hydrophobic segments are aggregated and form particles in the water phase, resulting in a smaller viscosity. Also, the fact that the viscosity of UAA chains is lowest in toluene can be interpreted as a result of ionic aggregation due to the no… Show more

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Cited by 20 publications
(20 citation statements)
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“…[25][26][27] Unlike with macrophase separation, the tensile strength, elongation and glass transition temperature of crosslinked polyurethane films increases as the degree of microphase separation between hydrophilic and hydrophobic segments or between soft and hard segments increases. This is because this microphase separation causes an increase in chain entanglement in each segment and microphase separated hydrophilic or hard segments act as physical fillers.…”
Section: Microphase Separated Structure and Mechanicalmentioning
confidence: 99%
“…[25][26][27] Unlike with macrophase separation, the tensile strength, elongation and glass transition temperature of crosslinked polyurethane films increases as the degree of microphase separation between hydrophilic and hydrophobic segments or between soft and hard segments increases. This is because this microphase separation causes an increase in chain entanglement in each segment and microphase separated hydrophilic or hard segments act as physical fillers.…”
Section: Microphase Separated Structure and Mechanicalmentioning
confidence: 99%
“…In our previous papers, we reported that microstructure of amphiphilic polyurethane networks could be largely changed with the solvent type used in the network preparation 15–17. Amphiphilic urethane acrylate precursor chains used in our previous study have two immiscible segments at the same chains, which consist of carboxylic acid groups as hydrophilic segments and poly(tetramethylene oxide)‐based hydrophobic segments.…”
Section: Resultsmentioning
confidence: 99%
“…Although amphiphilic urethane acrylate chains having hydrophilic moieties such as carboxylic, sulfonic acid, amino groups and polyoxyethylene (POE) groups have been widely used as water‐borne UV coatings,12,13 their application as nanocomposite matrix has not been reported. In our previous works, we could synthesize microphase‐separated amphiphilic polyurethane networks using amphiphilic urethane acrylate (AUA) ionomer and non‐ionomer having pendant carboxylic acid group and terminal hydrophilic poly(ethylene oxide) chains 14–18. Microstructures of these networks were largely changed with the nature of solvent used in the preparation of networks.…”
Section: Introductionmentioning
confidence: 99%
“…It has been reported that microphase separation in crosslinked urethane acrylate films strongly influences the mechanical properties of the film 35–37…”
Section: Resultsmentioning
confidence: 99%