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

Ghosh, Sutapa; Krishnamurti, N.

doi:10.1081/ppt-100002075

Cited by 18 publications

(16 citation statements)

References 25 publications

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“…In Figure 6, the T g s of these BA‐a : PU based on TDI at various compositions rendered the highest values among the three isocyanate systems. Ghosh and Krishnamurti 31. studied the properties of polyurethane based on polyethylene glycol at a molecular weight of 200 by using different diisocyanates (hexamethylene diisocyanate (HDI), IPDI, and TDI).…”

Section: Resultsmentioning

confidence: 99%

Thermomechanical characteristics of benzoxazine–urethane copolymers and their carbon fiber‐reinforced composites

Rimdusit

Liengvachiranon

Tiptipakorn

et al. 2009

J of Applied Polymer Sci

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Copolymers of polybenzoxazine (BA-a) and urethane elastomer (PU) with three different structures of isocyanates [i.e., toluene diisocyanate (TDI), diphenylmethane diisocyanate, and isophorone diisocyanate ], were examined. The experimental results reveal that the enhancement in glass transition temperature (T g ) of BA-a/ PU copolymers was clearly observed [i.e., T g of the BA-a/ PU copolymers in 60 : 40 BA-a : PU system for all isocyanate types (T g beyond 230 C) was higher than those of the parent resins (165 C for BA-a and À70 C for PU)]. It was reported that the degradation temperature increased from 321 C to about 330 C with increasing urethane content. Furthermore, the flexural strength synergism was found at the BA-a : PU ratio of 90 : 10 for all types of isocyanates. The effect of urethane prepolymer based on TDI rendered the highest T g , flexural modulus, and flexural strength of the copolymers among the three isocyanates used. The preferable isocyanate of the binary systems for making high processable carbon fiber composites was based on TDI. The flexural strength of the carbon fiber-reinforced BA-a : PU based on TDI at 80 wt % of the fiber in cross-ply orientation provided relatively high values of about 490 MPa. The flexural modulus slightly decreased from 51 GPa for polybenzoxazine to 48 GPa in the 60 : 40 BA-a : PU system.

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Section: Resultsmentioning

confidence: 99%

Thermomechanical characteristics of benzoxazine–urethane copolymers and their carbon fiber‐reinforced composites

Rimdusit

Liengvachiranon

Tiptipakorn

et al. 2009

J of Applied Polymer Sci

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“…The T g values estimated from the maximum peak of tan 9 were reported to be 31.6 and 50 2 C for PUMA derived from PEG 400 and 200 respectively [22]. Even though, these values were different from the T g values derived from DSC, they were found to have a similar trend.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 57%

Copolymerization Studies of Urethane Methacrylate and Ladder-Like Polysilsesquioxane Containing Side Chain Methacrylate Groups

Krishnan

Shang

2007

High Performance Polymers

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Urethane methacrylate (UMA) prepolymer was prepared by reacting 2 mole tolylene diisocyanate with 1 mole polyethylene glycol (molecular weight 400) followed by end-capping with 2 mole 2-hydroxyethyl methacrylate in N,N-dimethylformamide (DMF) solvent using stannous octoate as a catalyst. It took 72 h for complete reaction at ambient temperature as determined by monitoring the isocyanate peak at 2269 cm 11 . Ladder-like polysilsesquioxane (LPS) containing side chain methacrylate groups was prepared by stepwise coupling polymerization. Different weight fractions of UMA and LPS in DMF were copolymerized using 1% (w/w) dibenzoyl peroxide at 80 2 C for 24 h followed by post curing at 100 2 C for 4-5 h in a nitrogen atmosphere. The copolymers were characterized by Fourier transform infrared analysis, solid-state 13 C NMR spectroscopy, differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and thermogravimetric analysis. No glass transition temperatures were observed for the copolymers by DSC. The WAXD patterns of copolymers showed a broad peak corresponding to the width of double chain of LPS, indicating the incorporation of LPS in copolymers. These copolymers were more resistant to acid medium. The temperature of 5% weight loss increased with increasing silsesquioxane content in both air and nitrogen atmospheres, and verified the incorporation of LPS in the copolymers.

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“…In the present report, the sensitizer was probably the polyurethane/methacrylate, a UV‐curable polymer without CAS number. Polyurethane/methacrylate is prepared from (1) polyurethane components, namely a diisocyanate (toluene, hexamethylene or isophorone diisocyanate) and a polyol (polyethylene glycol PEG 200, PEG 400 or PEG 1000), (2) the UV‐curable resin 2‐HEMA and (3) other additives and catalysts (4). Its chemical formula is illustrated in Fig.…”

Section: Discussionmentioning

confidence: 99%

Occupational allergic contact dermatitis from polyurethane/methacrylates in windscreen repair chemical

Coz¹

2003

Contact Dermatitis

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

Cited by 18 publications

References 25 publications

Thermomechanical characteristics of benzoxazine–urethane copolymers and their carbon fiber‐reinforced composites

Thermomechanical characteristics of benzoxazine–urethane copolymers and their carbon fiber‐reinforced composites

Copolymerization Studies of Urethane Methacrylate and Ladder-Like Polysilsesquioxane Containing Side Chain Methacrylate Groups

Occupational allergic contact dermatitis from polyurethane/methacrylates in windscreen repair chemical

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