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

Zhang, Feilong; Jiang, Xubao; Zhu, Xiaoli; Chen, Zhiyong; Kong, Xiang Zheng

doi:10.1016/j.cej.2016.05.145

Cited by 32 publications

(17 citation statements)

References 22 publications

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Section: Resultsmentioning

confidence: 99%

“…The peak signal at 7.8 ppm was attributed to RCONH of PU, 2.50 and 1.65 ppm from symmetric H in PU, 2.1 ppm attributed to protons from the two different R groups in PU, 3.01 ppm from NH 2 of PHU, and 2.55 ppm attributed to NH of PHU. 21,22 In Figure 3, the d-shift peak signals were observed at 172 ppm, 32.5 ppm, 32.6 ppm, 39-42 ppm, and 60.8 ppm. The peak signal at 172 ppm was attributed to the influence of C¼O from PU, the peak signals at 32.5 and 32.6 ppm were attributed to the influence of NH and NH 2 group from PHU, the peak signals at 39-42 ppm (highest peak) were attributed to the rest of the carbons of the R and R 0 of PU, and the peak signal at 60.8 ppm indicated the influence of the hydroxyl group of the PHU.…”

Section: Nmr Spectroscopymentioning

confidence: 98%

“…The peak signal at 172 ppm was attributed to the influence of C¼O from PU, the peak signals at 32.5 and 32.6 ppm were attributed to the influence of NH and NH 2 group from PHU, the peak signals at 39-42 ppm (highest peak) were attributed to the rest of the carbons of the R and R 0 of PU, and the peak signal at 60.8 ppm indicated the influence of the hydroxyl group of the PHU. 21,22 Therefore, a probable structure of the hydrogel could be PU and PHU based block copolymer as shown in end product of Scheme 2.…”

Section: Nmr Spectroscopymentioning

confidence: 99%

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Structural and bone marrow stem cell biocompatibility studies of hydrogel synthesized via chemo-enzymatic route

et al. 2018

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Natural biopolymers have many attractive medical applications; however, complications due to fibrosis caused a reduction in diffusion and dispersal of nutrients and waste products. Consequently, severe immunocompatibility problems and poor mechanical and degradation properties in synthetic polymers ensue. Hence, the present study investigates a novel hydrogel material synthesized from caprolactone, ethylene glycol, ethylenediamine, polyethylene glycol, ammonium persulfate, and tetramethylethylenediamine via chemo-enzymatic route. Spectroscopic analyses indicated the formation of polyurea and polyhydroxyurethane as the primary building block of the hydrogel starting material. Biocompatibility studies showed positive observation in biosafety test using direct contact cytotoxicity assay in addition to active cellular growth on the hydrogel scaffold based on fluorescence observation. The synthesized hydrogel also exhibited (self) fluorescence properties under specific wavelength excitation. Hence, synthesized hydrogel could be a potential candidate for medical imaging as well as tissue engineering applications as a tissue expander, coating material, biosensor, and drug delivery system.

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Section: Resultsmentioning

confidence: 99%

Section: Nmr Spectroscopymentioning

confidence: 98%

Section: Nmr Spectroscopymentioning

confidence: 99%

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Structural and bone marrow stem cell biocompatibility studies of hydrogel synthesized via chemo-enzymatic route

et al. 2018

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“…However, commercially available monomers for them are too little to endow microspheres with ideal property, making it is difficult to obtain functional groups on the particle surface to meet different requirements for practical applications. Precipitation polymerizations of multi‐functional isocyanates with water, amino or hydroxyl compounds are systematic studied by our group and various solid and porous polyurea or polyurethane beads were obtained 23‐25 . Those particles were widely used as dyes degradation 26 and metal ions absorption, 27,28 and applied as supports of Pd 24,29 and Au 30,31 catalysts, benefiting of their functional surface with abundant amino groups.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of post‐modified poly(ester‐amino) microspheres via aza‐Michael precipitation polymerization and its use for enzyme immobilization

Sun

Jiang

et al. 2021

Polymers for Advanced Techs

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Uniform poly(ester‐amino) microspheres (PEAs) were prepared by catalyst‐free aza‐Michael addition precipitation polymerization of trihydroxymethylpropyl triacrylate (TMPTA) and piperazine (PA) in acetonitrile. The effects of monomer feed ratio and concentration, polymerization temperature, and time on the size and morphology of PEAs were investigated. Monodisperse PEAs with size about 4 μm were successfully obtained at 2/3 molar ratio of TMPTA/PA and 4°C. The chemical structure of PEAs was characterized. There were amount of unreacted acrylate groups remained on the surface of PEAs prepared at the imino/acrylate molar ratio of 1/1.1, which provide lots of active sites for further chemical modification, especially for bioactivator immobilization. Laccase was used as an example to determine bio‐immobilization activity of PEAs. Immobilized laccase exhibited higher tolerance to pH and temperature. The immobilized laccase was used as biocatalyst for degradation of Malachite Green. About 53% of its initial catalytic activity was retained after 4 cycles of reuse.

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“…However, this method generally results in formaldehyde residue in microcapsules shells inevitably, so polyurethane and polyurea are two optimally used polymers to fabricate MicroPCMs [26]. The polyurea shell is usually prepared by aromatic isocyanates and amine, such as diphenylmethanediisocyanate (MDI), toluene diisocyanate (TDI) [27], but aromatic isocyanates can hydrolyze into highly toxic phenylamine. Aliphatic isophoronediisocyanate (IPDI) as monomer to replace aromatic isocyanates can form polyurea microcapsules with good yellowing resistance and without any phenylamine [28].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Performance of Composite Microencapsulated Phase Change Materials with Palmitic Acid Ethyl Ester as Core

Yin

Zhu

et al. 2018

Polymers

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Microencapsulation of phase change materials (PCMs) could prevent the leakage of PCMs during solid–liquid phase change process. However, their applications are mainly limited by the compactness and thermal stability of the traditional polyurea shell microcapsules. To increase the thermal compactness and thermal stability of PCM microcapsules, tetraethylorthosilicate (TEOS) was employed to form polymer/SiO 2 composite shells to enhance the mechanical performance of polyurea and polyurethane microcapsule via interfacial polymerization and in situ polymerization. The morphology and chemical components of the microcapsules were characterized by field-emission scanning electron microscope (FE-SEM) and Fourier transform infrared (FT-IR) spectroscopy, respectively. The thermal properties of the microcapsules were investigated by differential scanning calorimetry (DSC) and thermal gravity analysis (TGA). The results showed the smoothness and compactness of both polyurea–SiO 2 and polyurethane–SiO 2 microcapsules enhanced slightly, when compared with that without TEOS addition. Moreover, the SiO 2 composite shell had good effect on thermal compactness, as the weight loss rate of polyurea–SiO 2 microcapsules and polyurethane–SiO 2 microcapsules decreased 3.5% and 4.1%, respectively.

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

Cited by 32 publications

References 22 publications

Structural and bone marrow stem cell biocompatibility studies of hydrogel synthesized via chemo-enzymatic route

Structural and bone marrow stem cell biocompatibility studies of hydrogel synthesized via chemo-enzymatic route

Synthesis of post‐modified poly(ester‐amino) microspheres via aza‐Michael precipitation polymerization and its use for enzyme immobilization

Fabrication and Performance of Composite Microencapsulated Phase Change Materials with Palmitic Acid Ethyl Ester as Core

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