Preparation of PEG-modified urethane acrylate emulsion and its emulsion polymerization

Kim, J. Y.; Suh, Kyung‐Do

doi:10.1007/bf00656621

Cited by 15 publications

(13 citation statements)

References 12 publications

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“…Several trials toward this objective have been described during recent decades, so there are examples of syntheses of polyacrylic/ PU hybrid dispersions and morphology characterizations of these systems in the existing literature. [4][5][6][7][8][9][10][11][12][13] A useful synthetic method is the polymerization of acrylic monomers in the presence of preformed PU chains with polymerizable terminal vinyl groups; this leads to products known as PU/acrylate or acrylic/PU hybrids. 14 In these hybrid systems, the two polymers may form a homogeneous blend within the particle, or nanophase-microphase separation may occur.…”

Section: Introductionmentioning

confidence: 99%

Polyurethane/acrylate hybrids: Effects of the acrylic content and thermal treatment on the polymer properties

Peruzzo

Anbinder

Pardini

et al. 2010

J of Applied Polymer Sci

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Polyurethane (PU)/acrylate hybrids with different acrylic contents (10,30, 50, 70, and 90 wt %) were prepared by the polymerization of acrylic monomers in the presence of preformed PU chains with polymerizable terminal vinyl groups. Films obtained by the casting of polymer dispersions before and after thermal annealing were characterized by dynamic light scattering, Fourier transform infrared spectroscopy, transmission electron microscopy (TEM), TEM electron energy-loss spectroscopy, differential scanning calorimetry, and gel fraction determination. Small-angle X-ray scattering (SAXS), wide-angle Xray scattering, mechanical properties testing, atomic force microscopy, water contact angle testing, Buchholz hardness testing, and roughness testing of the films were also performed. The effects of the acrylic content and thermal treatment on the structure and properties were determined. TEM showed that a core-shell morphology was formed during polymerization. When the acrylic content increased, smaller particles without core-shell morphologies were observed. TEM energy-loss spectroscopy studies confirmed this observation. Systems with up to 50 wt % acrylic component were homogeneous, as determined by SAXS, before and after thermal annealing. An attempt to incorporate a higher amount of acrylic component led to phase-separated materials with a different morphology and, therefore, different properties. The relationship between the acrylic content and properties did not follow linear behavior.

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Section: Introductionmentioning

confidence: 99%

Polyurethane/acrylate hybrids: Effects of the acrylic content and thermal treatment on the polymer properties

Peruzzo

Anbinder

Pardini

et al. 2010

J of Applied Polymer Sci

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“…However, for the CPUM4-70/ 30 core-shell latex, the surface polarity is 14. 24 have advantages in the aspect that they can maintain the spherical morphology of the rubber partidyne/cm, much higher than that of the PMMA film, indicating that the core/shell morphology is cles and that it is possible for them to form a significantly small rubber particle domain to not formed. The PUA4 core particle has a considerably higher surface polarity (21.30 dyne/cm) about 23 nm.…”

Section: Preparation Of Pua Core Latexmentioning

confidence: 95%

Preparation of toughened PMMA through PEG-modified urethane acrylate/PMMA core-shell composite particles

Park

Kim

Suh

1998

J. Appl. Polym. Sci.

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Poly(urethane acrylate) (PUA)/poly(methylmethacrylate) (PMMA) coreshell composite particles were prepared by two-stage emulsion polymerization. The sizes of composite particles could be varied from 25 to 210 nm by introducing polyoxyethylene (POE) groups to the urethane acrylate molecular backbone. Core-shell morphology was identified by investigating the polarity of the surface of the core and shell polymer particles and by measuring the contact angle of the composite particles. A composite particle prepared with relatively small particles (about 20 nm) did not show the core/shell morphology, because the high polar surface of the core polymer particle and the low-stage ratio of the core to the shell cause the formation of a core/shell twostage latex to be more thermodynamically unstable. The fracture toughness of rubbertoughened PMMA containing PUA/PMMA composite particles increased as the particle sizes decreased and the shell thickness of the composite particles increased. In particular, when the average size of the composite particle was about 43 nm and the stage ratio was 50/50, the fracture toughness of the rubber-toughened PMMA increased more than three times compared with that of pure PMMA. Furthermore, the transparency of toughened PMMA could be maintained up to 91% in the visible spectra range.

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“…The end point of this step was determined by the observation that the NCO value did not change with reaction time. 15 After that 1 mole PSi was added at 608C, and the hydroxyl groups will react with the NCO end groups of pre-polyurethane formed in the second step Figure 2 is the IR spectrum of purified PUASi. No peak at 2270-2240 cm 21 shows that NCO had been completely consumed.…”

Section: Introductionmentioning

confidence: 99%

“…Table I shows a typical recipe used in the preparation of PUASi/MMA/St concentrated emulsion. A known volume of an aqueous solution of SDS, OS 15 , PVA-1788 was added into a three-neck flask at 558C, equipped with mechanical stirrer, a funnel, and a nitrogen inlet. The monomers of St, MMA and PUASi containing the AIBN initiator were added dropwise to the above mentioned aqueous solution under stirring at a suitable rate to avoid phase separation.…”

Section: Introductionmentioning

confidence: 99%

Thin layer concentrated emulsion copolymerization of PUASi/Styrene/Methyl methacrylate

Zhang

Chen

Duan

et al. 2007

J of Applied Polymer Sci

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Stable concentrated emulsions of polymerizable polysiloxane-containing polyurethane (PUASi)/Styrene (St)/Methyl methacrylate (MMA) were prepared using sodium dodecyl sulphate (SDS)/nonyl polyoxyethylene ether (OS15)/polyvinyl alcohol (PVA) as composite surfactant and azobisisobutyronitrile (AIBN) as initiator. A novel polymerization method, thin layer polymerization was used to carry out the concentrated emulsion copolymerization at 558C. The effects of TDI/PPG molar ratio, surfactant concentration, different kinds of surfactants, and temperature on polymerization stability were studied. The effects of the thickness of the thin layer, the outside temperature of the reactor, as well as polymerization environment on the volatilization rate of water, and monomer in the system were investigated. The conversion-time relationships of the thin layer polymerization and the tube polymerization, as well as the effect of polymerization environment on the polymerization rate were also investigated. The morphology of latex particles was determined with transmission electron microscope (TEM).

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Preparation of PEG-modified urethane acrylate emulsion and its emulsion polymerization

Cited by 15 publications

References 12 publications

Polyurethane/acrylate hybrids: Effects of the acrylic content and thermal treatment on the polymer properties

Polyurethane/acrylate hybrids: Effects of the acrylic content and thermal treatment on the polymer properties

Preparation of toughened PMMA through PEG-modified urethane acrylate/PMMA core-shell composite particles

Thin layer concentrated emulsion copolymerization of PUASi/Styrene/Methyl methacrylate

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