Effect of NCO/OH ratio and Ce‐Zr nanoparticles on the thermo‐mechanical properties of hyperbranched polyurethane urea coatings

Mishra, Aswini K.; Allauddin, Shaik; Radhika, K.; Narayan, Ramanuj; Raju, K. Mohana

doi:10.1002/pat.1592

Cited by 15 publications

(12 citation statements)

References 45 publications

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“…The conclusion can be proved by the fact that the value of ΔW 1 % coincides with the value of hard% (shown in Table 6). In addition, the data of T 1on and Tgs coincide with the content of hydrogen bonding (shown in Figure 7), due to the fact that the more the hydrogen bonding, the more is the crosslink density, which brings the polymer backbones closer and thus reduces the molecular mobility, and increases the thermal stability and Tg [28,38]. The second and third decomposition data, shown in Table 6, have no obvious rules.…”

Section: Sample Name T 1on (°C) T 1max (°C) T 1end (°C) δW 1 a (%) Hamentioning

confidence: 66%

“…It is reported that the dendritic units different chemical shifts of 13 C NMR [28]. The marks of dendritic units (D), linear units (L) and terminal units (T) are shown in Figure 2A and W T &W L &W D represent the -N-CH 2 -zone (W) which stays in different units.…”

Section: Nmr Analysismentioning

confidence: 97%

“…The peaks at δ 45.45-47.52 correspond to methylene carbon atoms of the IPDI unit (P&P′) [31]. The peaks at δ 51.16-54.30 and δ 59.26-61.15 are related to methylene carbon atoms of the DEOA unit (W&Y) [28]. Obviously, the methyl and methylene carbon atom resonance peaks area of TMP (A&D) decrease with the increase of generation.…”

Section: Nmr Analysismentioning

confidence: 99%

“…In order to eliminate the protection/deprotection strategies, an approach to synthesis HBPU through selective activation of the unprotected AB 2 monomer, such as 1,1′-carbonyldiimidazole [26], is reported. Researchers found that diethanolamine (DEOA), as an AB 2 monomer, is an effective material to synthesize HBPUs [26][27][28]. Because the reaction of the secondary amino group of DEOA with isocyanate is much easier than the hydroxyl of DEOA with isocyanate, so the hydroxyl of DEOA can be left as end groups.…”

Section: Introductionmentioning

confidence: 98%

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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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Section: Sample Name T 1on (°C) T 1max (°C) T 1end (°C) δW 1 a (%) Hamentioning

confidence: 66%

Section: Nmr Analysismentioning

confidence: 97%

Section: Nmr Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Synthesis and characterization of novel hydroxyl-terminated hyperbranched polyurethanes

Wang

Huang

et al. 2014

Journal of Polymer Engineering

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“…The PU is well-known for their outstanding abrasion resistance, corrosion resistance, excellent flexibility, strong adhesion to substrates, possibility of tailoring properties, and also some other specific properties [3][4][5][6] . Therefore, it is widely used in manufacture industry, daily life, health care, and even the national defense industry.…”

Section: Introductionmentioning

confidence: 99%

Excellent tribological and anti-corrosion performance of polyurethane composite coatings reinforced with functionalized graphene and graphene oxide nanosheets

et al. 2015

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ABSTRACT：：：：In order to improve mechanical durability, polyurethane (PU) needs to be modified to enhance tribological and anti-corrosion properties. In this work, we fabricated a series of PU composite coatings reinforced with functionalized graphene (FG) and functionalized graphene oxide (FGO). The structural and morphological features of the composite coatings were characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, transmission electron microscopy and scanning electron microscopy. Results showed that the dispersion and compatibility of graphene and graphene oxide were improved via chemical modification. Moreover, they effectively enhanced the tribological and anti-corrosion properties of PU composite coatings, whose optimized additive range were between 0.25wt% and 0.5wt%. The effect depends on the balance of lubrication and barrier of fillers and cracks generated by them. Finally, in comparison with FG/PU coatings, FGO/PU coatings exhibited better tribological property but worse anti-corrosion property owing to abundant oxygenated groups of GO. They lead to stronger interfacial interaction between FGO and PU matrix, but destroyed the graphene lattice structure to some extent.

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Hyperbranched polyurethane‐urea‐imide/o‐clay‐silica hybrids: Synthesis and characterization

Mishra

Narayan

Aminabhavi³

et al. 2011

J of Applied Polymer Sci

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Hyperbranched polyurethane-urea-imide/ o-clay-silica (HBPUI/o-clay-silica) hybrid coatings were prepared using organically modified clay (o-clay) in the presence of cetyltrimethylammonium bromide (CTAB) and tributylhexadecylphosphonium bromide (TBHPB) cationic surfactants and were further surface-grafted by 3-aminopropyltrimethoxy silane (APTMS). Hybrid polyesters were prepared by incorporating into the first generation hyperbranched polyester polyol (HBP-G1) at various concentrations. The NCO-terminated hybrid prepolymers and chain extensions were achieved by imide chain extender. The modified clays were characterized by powder X-ray diffraction and Fourier transform spectroscopy. Viscoelastic, thermomechanical, and surface topology studies were performed by dynamic mechanical thermal analysis (DMTA), thermogravimetric analyser (TGA), universal testing machine (UTM), atomic force microscopic (AFM), and contact angle measurements. TGA and DMTA indicated higher thermal stability and glass transition temperature (T g ) of TBHPB-modified hybrid coatings compared with the CTAB counterparts, which increased with increasing silane-modified o-clay content. Water contact angle suggested increasing hydrophobicity of higher silane-modified o-clay containing coatings, while AFM confirmed the dispersibility of silane-modified o-clay into polymer matrix; the extent of dispersion increased with increasing silane-modified o-clay content in the hybrid formulation. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 125: E67-E75, 2012

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Effect of NCO/OH ratio and Ce‐Zr nanoparticles on the thermo‐mechanical properties of hyperbranched polyurethane urea coatings

Cited by 15 publications

References 45 publications

Synthesis and characterization of novel hydroxyl-terminated hyperbranched polyurethanes

Synthesis and characterization of novel hydroxyl-terminated hyperbranched polyurethanes

Excellent tribological and anti-corrosion performance of polyurethane composite coatings reinforced with functionalized graphene and graphene oxide nanosheets

Hyperbranched polyurethane‐urea‐imide/o‐clay‐silica hybrids: Synthesis and characterization

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