One step preparation of porous polyurea by reaction of toluene diisocyanate with water and its characterization

Han, Hui Min; Li, Shusheng; Zhu, Xiaoli; Jiang, Xubao; Kong, Xiang Zheng

doi:10.1039/c4ra06383j

Cited by 63 publications

(54 citation statements)

References 67 publications

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“…The XRD data of the aromatic polyurea revealed that the material was mainly amorphous. Very broad but characteristic reflexes were observed at 2θ = ≈11 and ≈22°. For the aliphatic polyurea nanocapsules, the reflexes were sharper than those for the aromatic system and the degree of crystallinity was evaluated to be about 55%.…”

Section: Resultsmentioning

confidence: 98%

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Highly Loaded Semipermeable Nanocapsules for Magnetic Resonance Imaging

Schlegel

Renz

Simon

et al. 2018

Macromolecular Bioscience

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Magnetic resonance imaging has become an essential tool in medicine for the investigation of physiological processes. The key issues related to contrast agents, i.e., substances that are injected in the body for imaging, are the efficient enhancement of contrast, their low toxicity, and their defined biodistribution. Polyurea nanocapsules containing the gadolinium complex Gadobutrol as a contrast agent in high local concentration and high relaxivity up to 40 s mmol L are described. A high concentration of the contrast agent inside the nanocapsules can be ensured by increasing the crystallinity in the shell of the nanocapsules. Nanocapsules from aliphatic polyurea are found to display higher crystallinity and higher relaxivity at an initial Gadobutrol concentration of 0.1 m than aromatic polyurea nanocapsules. The nanocapsules and the contrast agent are clearly identified in cells. After injection, the nanocarriers containing the contrast agent are mostly found in the liver and in the spleen, which allow for a significant contrast enhancement in magnetic resonance imaging.

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Section: Resultsmentioning

confidence: 98%

“…The aliphatic polyurea is known to exhibit a higher degree of crystallinity compared to an aromatic polyurea based on the monomers TDI and DAB. As in TDI the diisocyanate groups are angled, the degree of crystallinity is reported to be rather low . However, a higher degree of crystallinity is expected to increase the encapsulation efficiency .…”

Section: Resultsmentioning

confidence: 99%

Highly Loaded Semipermeable Nanocapsules for Magnetic Resonance Imaging

Schlegel

Renz

Simon

et al. 2018

Macromolecular Bioscience

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“…The FTIR spectrum of PUCorr‐1 (Figure a) shows the presence of C═O stretching of the urea linkage at 1,650 cm −1 , and a substituted –NH stretching at 3,350 cm −1 . The strong absorption band at 1,550 cm −1 represents –NH bending, whereas the –CH stretching band appeared around 3,000 cm −1 …”

Section: Resultsmentioning

confidence: 99%

Inhibition of mild steel corrosion in CO₂ and H₂S‐saturated acidic media by a new polyurea‐based material

Abdulazeez

Hamouz

Khaled

et al. 2019

Materials & Corrosion

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Oil well acidizing is a common practice used to boost oil well productivity in the industry. This practice, however, exposes the mild steel components of the wells to extremely harsh corrosive environments. Under such conditions, highly efficient inhibitors are used to minimize corrosion attack. In the present study, corrosion inhibition of mild steel in simulated acidic medium saturated with CO2 and H2S gases by a newly synthesized polyurea‐based material (PUCorr‐1) was investigated. Electrochemical studies supported with quantum chemical density‐functional theory calculations and surface characterization revealed that PUCorr‐1 adsorbs onto mild steel through a chemisorption mechanism yielding a stable protective film. The polyurea exhibited an excellent efficiency of 99.9% at a temperature of 50°C and a low concentration of 100 ppm, yielding a corrosion current density of 0.3 µA/cm2. In the presence of CO2 and H2S gases, PuCorr‐1 exhibited a remarkable performance (>93% efficiency) making it a potential corrosion inhibitor in industrial processes that involve the use of acid solutions in the presence of CO2 and H2S gases.

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“…However, this crosslinking reaction is believed not to occur because specific conditions (high temperature, catalyst) are required for this reaction [18,19]. Obviously, there are two types of linear PU formed in this polymerization as described above, and the chain of the PU from the reaction of TDI with water is likely more rigid than that from the reaction of TDI with EDA based on its chemical structure as shown in Fig.…”

Section: Mechanism Of Pu Formation By Tdi Reactionsmentioning

confidence: 99%

Preparation of uniform and porous polyurea microspheres of large size through interfacial polymerization of toluene diisocyanate in water solution of ethylene diamine

Zhang

Jiang

Zhu

et al. 2016

Chemical Engineering Journal

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One step preparation of porous polyurea by reaction of toluene diisocyanate with water and its characterization

Abstract: Porous polyurea is synthesized by reacting toluene diisocyanate with water in a water–acetone binary solvent. Materials characterization led to the likely conformations of the polymer chains owing to presence of intensive H-bonding.

Cited by 63 publications

References 67 publications

Highly Loaded Semipermeable Nanocapsules for Magnetic Resonance Imaging

Highly Loaded Semipermeable Nanocapsules for Magnetic Resonance Imaging

Inhibition of mild steel corrosion in CO₂ and H₂S‐saturated acidic media by a new polyurea‐based material

Preparation of uniform and porous polyurea microspheres of large size through interfacial polymerization of toluene diisocyanate in water solution of ethylene diamine

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One step preparation of porous polyurea by reaction of toluene diisocyanate with water and its characterization

Abstract: Porous polyurea is synthesized by reacting toluene diisocyanate with water in a water–acetone binary solvent. Materials characterization led to the likely conformations of the polymer chains owing to presence of intensive H-bonding.

Cited by 63 publications

References 67 publications

Highly Loaded Semipermeable Nanocapsules for Magnetic Resonance Imaging

Highly Loaded Semipermeable Nanocapsules for Magnetic Resonance Imaging

Inhibition of mild steel corrosion in CO2 and H2S‐saturated acidic media by a new polyurea‐based material

Preparation of uniform and porous polyurea microspheres of large size through interfacial polymerization of toluene diisocyanate in water solution of ethylene diamine

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Product

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Inhibition of mild steel corrosion in CO₂ and H₂S‐saturated acidic media by a new polyurea‐based material