Novel hyperbranched waterborne polyurethane‐urea/silica hybrid coatings and their characterizations

Jena, Kishore K.; Sahoo, Sambita; Narayan, Ramanuj; Aminabhavi, Tejraj M.; Raju, Kvsn

doi:10.1002/pi.3109

Cited by 46 publications

(24 citation statements)

References 48 publications

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“…Furthermore, the 29 Si CP/MAS NMR spectrum of SiO 2 /SiCRG‐1 particles (Figure 4, c) clearly shows four resonances at approximately δ = –36.7, –46.9, –56.1, and –66.1 ppm, which, compared to literature values,17,44 can be ascribed to the Si sites in T 0 , T 1 , T 2 , and T 3 , in which n denotes the number of –Si–O– bonds linked to the Si site T n . Thus, T 1 , T 2 , and T 3 represent the Si sites in RSi(OSi)(OH) 2 , RSi(OSi) 2 OH, and RSi(OSi) 3 , respectively [R = –(CH 2 ) 3 –NHCOO–carrageenan] and further confirm the covalent bonding of carrageenan to the siliceous network.…”

Section: Resultsmentioning

confidence: 50%

“…Furthermore, the peak at δ = 157 ppm (C 7 ) that is assigned to the carbon in urethane groups42,43 confirms the covalent linkage between the polysaccharide κ‐carrageenan and the siliceous network. The carbonyl carbon of the urea groups that forms also contributes to the δ = 157 ppm signal 44,45. The broad resonances between δ = 61 and 106 ppm have been attributed to the carbon atoms of κ‐carrageenan (C 1 –C 6 and C 1′ –C 6′ ) 46.…”

Section: Resultsmentioning

confidence: 99%

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Carrageenan–Silica Hybrid Nanoparticles Prepared by a Non‐Emulsion Method

2015

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Spherical and monodispersed sub‐micrometer sized particles of organic–inorganic hybrids were prepared by means of a sol–gel non‐emulsion method using the biopolymer κ‐carrageenan and the alkoxysilane 3‐isocyanatopropyltriethoxysilane (ICPTES). The structural characterization of the carrageenan–silica hybrid particles was performed by using FTIR spectroscopy and solid‐state 29Si and 13C NMR spectroscopy and confirmed that κ‐carrageenan was covalently linked to the siliceous network via urethane bonds. Zeta‐potential measurements indicate the hybrids were functionalized on the surface with sulfonate groups from the polysaccharide. These hybrids display thermal sensitivity, which is of great relevance for biomedical applications such as drug encapsulation and thermally controlled drug‐delivery systems.

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Section: Resultsmentioning

confidence: 50%

Section: Resultsmentioning

confidence: 99%

Carrageenan–Silica Hybrid Nanoparticles Prepared by a Non‐Emulsion Method

2015

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“…Raju and his co-workers have done excellent researches on hyperbranched polyurethane (HBPU) and hyperbranched polyester [16][17][18][19][20][21]. HBPUs, with the advantage of excellent biocompatibility [22] and free adjustment of the soft segment and hard segment of polyurethane, have potential applications as special crosslinking agents [23] and in controlled drug release [24,25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel hydroxyl-terminated hyperbranched polyurethanes

Wang

Huang

et al. 2014

Journal of Polymer Engineering

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A series of novel hydroxyl-terminated hyperbranched polyurethanes (HBPUs) were synthesized via stepwise polymerization by diethanolamine (DEOA), isophorone diisocyanate (IPDI) and trimethylolpropane (TMP). It is interesting to note that the HBPUs can be purified by water. The HBPUs were characterized with 1 H nuclear magnetic resonance (NMR), 13 C NMR, Fourier transform infrared spectroscopy (FT-IR) and elemental analysis. The average degree of branching (DB) of HBPUs was calculated from the first generation to the fourth generation to be 1.00, 0.74, 0.59 and 0.57 by quantitative 13 C NMR, respectively. The branching model and molecular structure of HBPUs were deduced by the 13 C NMR and the value of DB. To investigate the changes of hydrogen bonding interaction in HBPUs with a variation in structure of different generations, the deconvolution of FT-IR spectra was carried out using Origin 7.0 software through the Gaussian curve-fitting method. The ratio of hydrogenbonded -NH and -OH groups of HBPUs was calculated to be 80.8%, 85.1%, 84.8% and 85.4% from the first generation to the fourth generation by deconvoluted -NH and -OH zone, respectively. The interaction of hydrogen bonding and glass transition temperature (Tg) of HBPUs increased with the increase of generation. The trend of thermal stability and Tg coincide with the change of hydrogen-bonded interactions.

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“…A waterborne polyurethane (WPU) dispersion that contains an azo structure, which can be synthesized via a chemical reaction using an azo dye as a chain extender, not only can overcome drawbacks originating from physical blending, such as poor rubbing resistance, instability and poor brightness, the nucleating effect, poor compatibility between dyes and polyurethane resins, poor wash fastness, and dye migration (7,8), but can also avoid the weaknesses inherent in the synthesis of present reactive polyurethanes, such as the low activity exhibited by phenolic hydroxyl and the inequality of different hydroxyls. WPU dispersions that contain azobenzene groups combine azo polymers with photoresponsive properties and selfassembling characteristics and can generate photosensitive micelles (9).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Photochromism Properties of Anionic Waterborne Polyurethane Containing Azobenzene Chromophores

Zheng

Zhang

2015

Journal of Macromolecular Science, Part A

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A series of novel waterborne polyurethane dispersions (HPB-WPU) possessing the property of photochromism was prepared from isophorone diisocyanate (IPDI), polytetramethylene ether glycol (PTMG), and 2, 2-dimethylol propionic acid (DMPA) using a selfmade azo diol, N, N-bis-(2-hydroxy-ethyl)-4-phenylazo-aniline (HPB), as a chain extender to partially substitute for 1, 4-butanediol (BDO). The molecular structures of HPB and HPB-WPU were confirmed using Fourier-transform infrared spectroscopy. The photochromism of HPB and HPB-WPU was evaluated using ultraviolet visible (UV-Vis) absorption spectroscopy during the test. The results indicated that when the dispersion was placed under UV irradiation, the color and absorption intensity both changed. The UV-Vis absorption showed a blue shift effect of about 33 nm when HPB was blocked into polyurethane chains. The azo chromophore became permanently fixed into the molecule, and the dispersions remained stable for a long time because of the covalent bonding with polyurethane chains during synthesis. There were no precipitates or any other changes after they had been allowed to remain at room temperature for half a year. The synthesized HPB-WPU was also investigated using differential scanning calorimetric analysis, particle size analysis, and water resistance analysis. It was observed that HPB could improve the thermostability, emulsion stability and water-resistant property of the waterborne polyurethane.

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Novel hyperbranched waterborne polyurethane‐urea/silica hybrid coatings and their characterizations

Cited by 46 publications

References 48 publications

Carrageenan–Silica Hybrid Nanoparticles Prepared by a Non‐Emulsion Method

Carrageenan–Silica Hybrid Nanoparticles Prepared by a Non‐Emulsion Method

Synthesis and characterization of novel hydroxyl-terminated hyperbranched polyurethanes

Synthesis and Photochromism Properties of Anionic Waterborne Polyurethane Containing Azobenzene Chromophores

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