High performance UV cured polyurethane dispersion

Lee, Min Hee; Choi, Hee Young; Jeong, Kie Youn; Lee, Jung Wook; Hwang, Tae Won; Kim, Byung Kyu

doi:10.1016/j.polymdegradstab.2007.06.006

Cited by 31 publications

(11 citation statements)

References 16 publications

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“…1B, the typical absorption peaks at 2970-2860, 1721 and 1256 cm -1 , were assigned to the stretching vibration of C-H, -C=O and C-N of the fPU backbone, respectively. [27][28][29] The N-H bending vibration absorption peak of fPU appeared at 1576 cm -1 , while the N-H stretching vibtation absorption at about 3336 cm -1 was overlapped by the vibration peak of the absorbed H 2 O. 30 The characteristic peak originated from the -C=S group appeared at 1074 cm -1 31, 32 in the FTIR of fPU, indicating the successful incorporation of RAFT groups onto PU backbone.…”

Section: Page 8 Of 21 Rsc Advancesmentioning

confidence: 98%

Well-defined polyurethane-graft-poly(N,N-dimethylacrylamide) copolymer with a controlled graft density and grafted chain length: synthesis and its application as a Pickering emulsion

Yuan

Gao

et al. 2016

RSC Adv.

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A robust method for the synthesis of the well-defined polyurethane-graft-poly(N,N-dimethylacrylamide) (PU-g-PDMA) copolymers with a good control over the graft density and the grafted chain length was presented in this study. Firstly, functional polyurethane (fPU) polymer with trithiocarbonate-based chain transfer agent lateral group was synthesized by the polyaddition reaction of 2,2-bis(hydroxymethyl)butyl 2-(ethylthiocarbonothioylthio)-2-methylpropanoate (BEMP) with hexamethylene diisocyanate (HDI), and the subsequent chain extension reaction with 1,4-butanediol (BDO). The content of the chain-transfer groups in the synthesized fPU could be well tuned by altering the mole ratio of BEMP to HDI during the synthesis of prepolymer. The produced fPU was then applied as the macro-RAFT to mediate the radical polymerization reaction of the N,N-dimethylacrylamide (DMA) monomers that were initiated by azobisisobutyronitrile (AIBN), resulting in well-defined amphiphilic PU-g-PDMA graft copolymers with a known graft density and tunable grafted chain lengths. The structure of the obtained PU-g-PDMA was characterized carefully by FTIR and 1 H NMR. The average molecular weight and polydistribution of PU-g-PDMA copolymers were analyzed by GPC. The thermal properties of fPU and PU-g-PDMA copolymers were investigated by differential scanning calorimetry (DSC) and themogravimetric analysis (TGA). The amphiphilic PU-g-PDMA graft copolymers could self assemble into spherical nanoparticles with a core-shell structure in water. The core-shell structure nanoparticles could be applied as emulsifiers for the formation of stabilized toluene in water Pickering emulsion, and an extremely low content of emulsifiers (~0.01%) relative to the total weight of oil and water was required.

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Section: Page 8 Of 21 Rsc Advancesmentioning

confidence: 98%

Well-defined polyurethane-graft-poly(N,N-dimethylacrylamide) copolymer with a controlled graft density and grafted chain length: synthesis and its application as a Pickering emulsion

Yuan

Gao

et al. 2016

RSC Adv.

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“…Free radical photoinitiators are a kind of compound that easily decomposes into radicals when heated. They cannot only be used to trigger alkene, double alkene monomer free radical polymerization and copolymerization reaction but also can be used for cross-linking curing of unsaturated polyester and macromolecular cross-linking reaction; thus, free radical photoinitiators are the most widely used [18]. The synthetic route and curing process of UV-EMSC are also shown in Figure 1.…”

Section: Tpgda (G) Photoinitiatormentioning

confidence: 99%

Effect of different photoinitiators on the properties of UV-cured electromagnetic shielding composites

Dai¹,

Qiu²,

Wang³

et al. 2014

Journal of Polymer Engineering

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A series of UV-cured electromagnetic shielding composites (UV-EMSC) containing different content of graphene oxide (GO) were prepared with oligomer, acrylate active diluents and different photoinitiators (Darocur 1173, Irgacure 184 or Irgacure 651). To fabricate conductive oligomer with low resistivity, polyurethane-acrylate (PUA) was used as the polymer matrix to help construct two-dimensional conductive networks consisting of GO. For forming conductive network structure, the surface functional groups (-OH, -COOH) of GO served as slightly conductive particles bonded with -NCO from the chain of polyurethane. The UV-EMSC exhibited a low resistivity of approximately 402 Ω·cm and an outstanding enhanced electrical conductivity of 249 mS/m at a GO content of 0.0200%. The effects of different photoinitiators on the properties of UV-cured films were investigated. The results indicate that the prepared UV-EMSC has great potential applications in different regions, such as in coatings of electronic, electrical, communications, plastic coatings and wood finishes.

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“…Chain extension reactions were followed by monitoring the disappearance of the characteristic peaks of the anhydride groups at 1848 and 1788 cm À1 (Figure 2(a)) and the appearance of the characteristic peaks of imide absorption band at 1768 cm À1 (imide C¼O, in-phase, Figure 2(b)). 14,17 The spectra of the NCOterminated prepolymer (Figures 2(a) and (b)) showing the characteristic absorption peak at 2270 cm À1 (N¼C¼O group stretching) illustrated that the NCO groups still have a surplus. The presence of characteristic band vibrations at 3150-3650 cm À1 (N-H stretching), 1600-1800 cm À1 (amide I: C¼¼O stretching vibrations), 1540 cm À1 (amide…”

Section: Ft-ir Spectra Analysismentioning

confidence: 99%

“…Previous research has shown that the WPUs containing ionic groups in the soft segments have significantly lower solution viscosity, smaller particle size, greater dispersion viscosity, and lesser swelling in water compared with ionic hard segments. [13][14][15][16] WPUs are typically prepared using short diols as chain extensions. They produce many urethane linkages that are vulnerable to thermal decomposition, which restrict their application.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of novel ultraviolet-cured waterborne polyurethanes

Fang

Zhou

Zhong

et al. 2013

High Performance Polymers

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A new ultraviolet (UV)-cured waterborne polyurethane (WPU) mainly composed of ionic soft segments, imide groups, and a new water-soluble UV-cured cross-linking agent containing both C¼C bond and carboxy group was prepared. The ionic soft segments were prepared by 1,6-hexamethylene diisocyanate , poly(propylene glycol)-600, and dimethylol butanoic acid. The imide groups were introduced into polyurethane by extending them with pyromellitic dianhydride (PMDA). The new water-soluble UV-cured cross-linking agent (MLGLY) was synthesized by hydrophilic maleic anhydride and glycerol oligomer. The particle size and the viscosity of the new anionic WPU as well as the water swelling, gel content, mechanical properties, and thermal stability of the UV-cured WPU cast films were investigated. The results showed that the best performance of WPU was obtained with 0.024 mol of PMDA and 5 wt% of MLGLY.

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High performance UV cured polyurethane dispersion

Cited by 31 publications

References 16 publications

Well-defined polyurethane-graft-poly(N,N-dimethylacrylamide) copolymer with a controlled graft density and grafted chain length: synthesis and its application as a Pickering emulsion

Well-defined polyurethane-graft-poly(N,N-dimethylacrylamide) copolymer with a controlled graft density and grafted chain length: synthesis and its application as a Pickering emulsion

Effect of different photoinitiators on the properties of UV-cured electromagnetic shielding composites

Preparation and properties of novel ultraviolet-cured waterborne polyurethanes

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