Mechanical properties of UV‐cured urethane films

Nakazato, Sumika; Amari, Takeshi; Yamaoka, Tsuguo

doi:10.1002/app.1989.070380404

Cited by 12 publications

(6 citation statements)

References 3 publications

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“…It has been also reported that the degree of microphase separation in crosslinked urethane acrylate films strongly influences the mechanical properties of its film 15,36–38. As the degree of microphase separation between hydrophilic and hydrophobic or between soft and hard segments increases, tensile strength, elongation, and glass transition temperature of crosslinked polyurethane films increases.…”

Section: Resultsmentioning

confidence: 98%

“…As the degree of microphase separation between hydrophilic and hydrophobic or between soft and hard segments increases, tensile strength, elongation, and glass transition temperature of crosslinked polyurethane films increases. Microphase separation causes an increase of chain entanglement in each segment and therefore microphase separated hydrophilic or hard segments act as physical fillers 14,15,36–38. Figure 6 and 7 represent the stress‐strain curves for UAND and UANH films prepared at the different weight fraction of solvents used during cross‐linking reaction.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Magnetic Nanocomposite Based on Amphiphilic Polyurethane Network Films

Kim¹,

Shin²,

Ihn

et al. 2002

Macro Chemistry & Physics

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Magnetic nanocomposites, showing extremely small coercivity and hysteresis loop, were synthesized using amphiphilic polyurethane networks based on amphiphilic urethane acrylate nonionomer (UAN) precursor chains. Three kinds of UAN gel films were synthesized through UV‐curing of UAN chains in the absence of a solvent, or crosslinking polymerization of UAN/water and UAN/DMAc mixtures. Even though these gel films were synthesized with the same UAN, these UAN gel films had very different microstructures depending on the preparation conditions; as a consequence, magnetic composites prepared with these crosslinked films exhibited very different size and morphology of magnetic nanoparticles. Atomic force microscopy and mechanical property measurements showed that UAN gel film (UANH) synthesized with UAN/water mixture had the highly microphase‐separated structures whereas the gel films synthesized via UV‐curing (UANV) or polymerization of UAN/DMAc mixture (UAND) had relatively homogeneous structures. The largest ellipsoidal particles were formed in UANH gel films and the smallest ellipsoidal particles and rod‐shaped particles were made up in UANV gel and UAND gel film, which was confirmed by transmission electron microscopy.Transmission electron micrograph of magnetic composite film prepared with UANV.magnified imageTransmission electron micrograph of magnetic composite film prepared with UANV.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Synthesis of Magnetic Nanocomposite Based on Amphiphilic Polyurethane Network Films

Kim¹,

Shin²,

Ihn

et al. 2002

Macro Chemistry & Physics

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“…It was previously reported that nanophase separation in crosslinked urethane acrylate films strongly influences the mechanical properties of its film 26–33. Unlike macrophase separation, tensile strength, elongation, and glass‐transition temperature of crosslinked polyurethane films increases concomitantly with the degree of nanophase separation between the soft segment and the hard segment.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of nanophase‐separated poly(urethane‐co‐acrylic acid) network films and their application for magnetic nanoparticle synthesis

Kim¹,

Shin²,

Ryu³

et al. 2004

J of Applied Polymer Sci

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Poly(urethane-co-acrylic acid) films were synthesized by the copolymerization of urethane acrylate nonionomer (UAN) and acrylic acid (AA) under different conditions. Poly(urethane-co-acrylic acid) films exhibited very different mechanical properties, attributed to the microstructural difference with the type of solvents used in the film preparation. The film synthesized using UAN/AA/ water mixture had a relatively highly nanophase separated structure compared to that of the other films prepared using UAN/AA/dioxane mixture, resulting in higher mechanical property and glass-transition temperature. The nanostructural differences could be also confirmed by atomic force microscopy measurements. Magnetic nanocomposite films synthesized based on UAN/AA/water and UAN/AA/dioxane mixtures showed different sizes of magnetic nanoparticles, attributed to the differences of size of hydrophilic nanodomains. The higher the degree of nanophase separation within poly(urethane-co-acrylic acid) films, the larger the size of hydrophilic nanodomains, resulting in formation of larger nanoparticles.

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“…The length of soft segment and its type is an important parameter to control the dynamic mechanical properties of the polyurethane acrylates (15)(16)(17)(18)(19)(20)(21). Much less work has been devoted to the hard segment type (16,22).…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Uv-Curable Polyurethane Methacrylate Cationomers and Their Use as Adhesives

Ghosh

Krishnamurti

2001

Polymer-Plastics Technology and Engineering

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Cationomeric polyurethanes (containing methacrylic functionality) were prepared from a diisocyanate [toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI), or isophorone diisocyanate (IPDI)], polyethylene glycol (PEG 200, PEG 400, or PEG 1000), 2-hydroxyethyl methacrylate (HEMA), N -methyldiethanolamine (N -MDEA), and dimethyl sulfate (DMS), using dibutyltin dilaurate (DBTDL) as a catalyst. The ultraviolet (UV) curable aqueous cationomeric emulsions were then made with these reactive polyurethane oligomers (having hydrophilic groups), water, and photoinitiator [1-(4-isopropylphenyl)-2-hydroxy-2-methyl propane-1-one]. The effects of PEG chain length and different diisocyanates on properties of the emulsions were studied. The effect of concentration of cationomers on the thermal stability of these systems was also studied. These emulsion systems were evaluated as adhesives before and after curing under UV light. With decrease in PEG molecular weight, the glass transition temperature of the ORDER REPRINTS 540GHOSH AND KRISHNAMURTI polymers increased and the storage modulus, tensile strength, and peel strength also increased, but the percentage of elongation decreased. Polymer containing TDI was found to have the highest glass transition temperature, storage modulus, peel strength, and tensile strength when compared to the polymer containing HDI or IPDI.

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Mechanical properties of UV‐cured urethane films

Cited by 12 publications

References 3 publications

Synthesis of Magnetic Nanocomposite Based on Amphiphilic Polyurethane Network Films

Synthesis of Magnetic Nanocomposite Based on Amphiphilic Polyurethane Network Films

Synthesis of nanophase‐separated poly(urethane‐co‐acrylic acid) network films and their application for magnetic nanoparticle synthesis

Preparation and Properties of Uv-Curable Polyurethane Methacrylate Cationomers and Their Use as Adhesives

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