• Journal of Adhesion and Interface
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• v.8 no.2
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• pp.9-14
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• 2007

Poly(ethylene glycol) (PEG), isophoron diisocyanate (IPDI), and 1,1,1-tris(hydroxymethyl)propane (THMP) were used to synthesize polyurethane microgel. The formulation to form a microgel was determined, and the shape and the properties of the microgel were characterized with SEM and particle size analyzer. The microgel was only formed when PEG was used more than THMP exceedingly. Therefore, it is believed that PEG plays an important role in the synthesis of the microgel. During the formation of the microgel, the viscosity of the microgel solution was decreased. Molecular weights of the PEGs which were used in this research were 2,000, 6,000, and 10,000. The microgel synthesized with PEG 6000 showed the best property in comparison with others. The size of the microgel measured by particle size analyzer were about 130~230 nm.

• Elastomers and Composites
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• v.35 no.4
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• pp.281-287
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• 2000

Waterborne polyurethane(PU) microgel dispersions were synthesized with different mole ratio of polytetramethylene glycol(PTMG) to dimethylol propionic acid(DMPA). Particle size distribution, thermal and mechanical properties of the PU microgels were investigated. Particle size of the microgels was distributed in the range of $98{\sim}$680{\mu}m$ and decreased with increasing the mole ratio of DMPA and 1,2,6-hexanetriol. Glass transition temperature and melting temperature of the microgels were in the range of $-79.7 {\sim}-78.1^{\circ}C$, $22{\sim}24^{\circ}C$ respectively. Tensile strength and elongation of the PU microgel films were maximum in the case of 60/40 mole ratio of PTMG/DMPA.

• Polymer(Korea)
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• v.25 no.1
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• pp.41-48
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• 2001

Polyurethane(PU) microgels were synthesized from poly(caprolactone) diol(PCD) and/or poly(ethylene glycol)(PEG), diisocyanate and 1,2,6-hexane triol by solution polymerization method. A critical gelation concentration of the PU microgels with, mole ratios of PCD/PEG were the important factors influencing the formation and property microgel or macrogels. The physical and thermal properties of the PU microgels prepared with depending upon the structure of diisocyanate, mole ratio of PCD/PEG, and molecular weight of PEG were investigated. It was found that PU microgels were distributed by polydisperse, spherical small particles below 300nm and showed the properties of low viscosity.