Relevant bibliographies by topics / Polyurea Microcapsules

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Polyurea Microcapsules'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Polyurea Microcapsules"

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He, Yongjun, Jingyun Feng, Xin Yi, Furu Kang, and Jun Deng. "Study of polyamine species modulating the properties of polyurea microencapsulated wall materials." Journal of Physics: Conference Series 2961, no. 1 (2025): 012010. https://doi.org/10.1088/1742-6596/2961/1/012010.

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Abstract This study explored the impact of various polyamines on polyurea shell performance and identified optimal candidates for high-performance microcapsules. Isophorone diisocyanate (IPDI) was combined with six polyamines (EDA, DAB, HMD, PPD, DETA, and TETA) to synthesize crosslinked polyurea shells via solvent-assisted precipitation polymerization. The polyurea coatings were characterized using ultraviolet-visible spectrophotometry, SEM, FTIR, X-ray diffraction, and thermogravimetric analysis to assess polymerization, microstructure, composition, and crystallinity. Results showed that pol
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Ma, Yanxuan, Yingrui Zhang, Jiatong Liu, et al. "Preparation and Characterization of Ethylenediamine-Polyurea Microcapsule Epoxy Self-Healing Coating." Materials 13, no. 2 (2020): 326. http://dx.doi.org/10.3390/ma13020326.

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Polyurea microcapsules with Ethylenediamine (EDA) as the core material were synthesized. A set of characterization methods, including optical and scanning electron microscopy (OM and SEM), the Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA) were used to confirm the microcapsule morphology and chemical structures. The influence of emulsifier content and stirring rate on size and morphology of the microcapsules was investigated, and the self-healing performance of EDA-Polyurea microcapsule/epoxy coatings was evaluated by electrochemical impedance spectroscopy
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Takei, Takayuki, Masahiro Yoshida, Tomonori Nagayoshi, Yasuo Hatate, Kouichiro Shiomori, and Shiro Kiyoyama. "Preparation and Characterisation of Phase Change Material-Loaded Polyurea Microcapsules Several Hundred Micrometres in Diameter." Polymers and Polymer Composites 17, no. 6 (2009): 365–69. http://dx.doi.org/10.1177/096739110901700604.

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In the present study, we attempted to prepare phase-change material (PCM)-loaded polyurea microcapsules several hundred micrometres in diameter via oil-in-water emulsion polymerisation. An oil phase with two types of isocyanate monomers (2,4-toluene diisocyanate (TDI) and phenyl isocyanate (PI)) and tetradecane as PCM was dispersed in an aqueous phase with hexamethylene diamine (HMD). The polyurea shell of microcapsules was formed by reaction of the isocyanate monomers with the amine groups derived from HMD and hydrolysed isocyanate monomers. A suitably adjusted agitation rate made it possible
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Lai, Weidong, Xinzheng Li, Huiqing Liu, Lu Han, Yajun Zhao, and Xiaowei Li. "Interfacial Polycondensation Synthesis of Optically Sensitive Polyurea Microcapsule." Journal of Chemistry 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/597578.

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TMPTA prepolymer resin and photoinitiators of ITX/TPO had been encapsulated in core-shell structured microcapsules as optical responding ingredients based on interfacial polycondensation method, and polyurea structured microcapsule shell had been formed on the sheared O/W interface. The synthesized microcapsule had regular core-shell structure with the diameter of about 0.455 μm and shell thickness of about 40 nm. UV-visible absorption spectra indicated that the encapsulated ITX and TPO photoinitiators could efficiently absorb UV irradiation. Under exposure, the C=C bonds absorbance of the mic
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Zhu, Jin Hua, Qing Zhen Wen, Chao Yu, Xiong Wei, and Li Qing Zhou. "Preparation of Microencapsulated Phase Change Materials Using Surface Modification Method." Advanced Materials Research 902 (February 2014): 52–57. http://dx.doi.org/10.4028/www.scientific.net/amr.902.52.

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With the adoption of surface modification method, microencapsulated phase change materials (MEPCM) with polyurea as wall materials, paraffin as core materials were successfully prepared. This paper made a research on the effect dosage of modifier might have on the content of microcapsule core materials. Findings indicated that the content of microcapsule core materials was relatively high as the dosage of modifier being core material 10 wt%. It was preliminarily proved that polyurea had been coated on the surface of paraffin particles by adopting Fourier Transform Infrared Spectrum (FTIR) to f
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Aryanti, Nita, Richard Andrew Williams, and Qinchung Yuan. "Application of Square and Oblong Pore Shapes in Rotating Membrane Emulsification to Produce Novel Particulate Products." Reaktor 20, no. 1 (2020): 47–56. http://dx.doi.org/10.14710/reaktor.20.1.47-56.

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Rotating membrane emulsification (RMR) has been intensively developed and applied for producing emulsion as well as particulate products such as microcapsules. Polyurea microcapsules were generally prepared by interfacial polycondensation polymerisation with addition of modifier to produce more stable microcapsules. In this research, development of the RMR was applied for producing polymer particles stabilised by nanoparticle without any addition of surfactant or modifier. Two types of membrane pores, the square (Type-A) with hydraulic diameter (Dh) of 84 mm and oblong pores with an aspect rat
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Wang, Xianfeng, Chunhong Li, Meihui Wang, Tao Zhao, and Wenyao Li. "Bifunctional Microcapsules with n-Octadecane/Thyme Oil Core and Polyurea Shell for High-Efficiency Thermal Energy Storage and Antibiosis." Polymers 12, no. 10 (2020): 2226. http://dx.doi.org/10.3390/polym12102226.

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A new kind of bifunctional microcapsule containing a n-octadecane (OD) and thyme oil (TO) core based on polyurea shell designed for thermal energy storage and antibiosis was prepared successfully through interfacial polymerization. The scanning electron microscopic investigations reveal that the obtained composite microcapsules present the regular spherical morphology and the transmission electron microscopic observations confirm the clear core–shell structure. Morphological and chemical structure analyses prove the successful synthesis of bifunctional microcapsules. Thermogravimetric analysis
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Zhang, Yuhua, Xi Zhang, Yurong Yan, and Zhonghua Chen. "Microencapsulation of Photochromic Solution with Polyurea by Interfacial Polymerization." Polymers 13, no. 18 (2021): 3049. http://dx.doi.org/10.3390/polym13183049.

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Photochromic materials are interesting materials because of their color-changing property under UV light and visible light irradiation. However, they are vulnerable to many factors, such as pH oxygen, ion, solvent, etc. because of the unsaturated bonds existing on the photochromic molecular. Microencapsulation of the photochromic materials can separate them from the surroundings. Here, photochromic microcapsules using 3,3-Diphenyl-3H-naphtho[2,1-b] pyran (NP)/solution as core and polyurea as shell via interfacial polymerization were prepared, and bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate
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Li, Cunjun, Minghao Wang, Zhaoliang Liu, Yanqi Xu, Chunhui Zhou, and Linjiang Wang. "Kaolinite-armoured polyurea microcapsules fabricated on Pickering emulsion: controllable encapsulation and release performance of a lipophilic compound." Clay Minerals 56, no. 1 (2021): 46–54. http://dx.doi.org/10.1180/clm.2021.15.

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AbstractMicrocapsules are successfully used in various applications such as self-healing, drug delivery and military camouflage. The shells of the microcapsules based on the traditional surfactant-stabilized emulsion template method are often single organic materials. The surfactants generally have insufficient stability against demulsification during preparation of the microcapsules. In the present study, kaolinite was used as an emulsifier for stabilizing Pickering emulsions and subsequently as an enhancer for forming microcapsules. Kaolinite-armoured polyurea microcapsules were fabricated b
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Petersen, Brent B., and Patrick J. Shea. "Microencapsulated Alachlor and Its Behavior on Wheat (Triticum aestivum) Straw." Weed Science 37, no. 5 (1989): 719–23. http://dx.doi.org/10.1017/s0043174500072696.

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Scanning electron microscopy (SEM) was used to study alachlor microcapsule morphology and the effects of straw age and moisture on herbicide release. Microcapsule diameter in the formulation ranged from 2 to 15 μm. The polyurea encapsulating material was stable in water over time. Diffusion was suggested as the primary mode of alachlor release, with diffusion rate controlled by herbicide and salt concentration gradients between the microcapsule and the surrounding aqueous solution. Alachlor release was promoted by drying the microcapsules before addition to water. Microcapsule morphology was u
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Dissertations / Theses on the topic "Polyurea Microcapsules"

1

He, Wei. "Dual-functional polyurea microcapsules for chronic wound care dressings: sustained drug delivery and non-leaching infection control." John Wiley and Sons, 2012. http://hdl.handle.net/1993/8443.

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A new design of dual-functional polyurea microcapsules was proposed for chronic wound dressings to provide both non-leaching infection control and sustained topical drug delivery functionalities. Quaternary ammonium functionalized polyurea microcapsules (MCQs) were synthesized under mild conditions through an interfacial crosslinking reaction between branched polyethylenimine (PEI) and 2,4-toluene diisocyanate (TDI) in a dimethylformamide/cyclohexane emulsion. An in-situ modification method was developed to endow non-leaching surface antimicrobial properties to MCQs via bonding antimicrobial s
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Kothari, Jehan. "Synthesis and Thermal Analysis of Hexamethylene Diisocyanate/Polyurea Formaldehyde Core/Shell Self-Healing Microcapsules." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504803190656406.

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WU, WEN-XIU, and 吳文修. "Study on synthesis of polyurea microcapsules and their physical properties." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/16760727919354758724.

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Liou, Ren-chaur, and 劉仁朝. "Study on Lougevirt of Herbicides Polyurea Microcapsules Synthesis and Control Release." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/85367101011483563236.

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CHEN, JIAN-YUAN, and 陳建源. "Study on glyphosate of herbicide synthesis of polyurea microcapsules and control release." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/89529689260212905796.

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WU, JING-TONG, and 吳景通. "The effect of emulsifier on the particle size of red #170 polyurea microcapsule in interfacial polycondensation." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/29994254758834251165.

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Book chapters on the topic "Polyurea Microcapsules"

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Paik, Seung Uk. "Environmentally Friendly Polyurea Microcapsules of Pesticides by PVA Mediated Interfacial Polymerization." In Materials Science Forum. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-995-4.678.

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Fahimizadeh, Mohammad, Li Wen Wong, Joash Ban Lee Tan, and Pooria Pasbakhsh. "Polyurea microcapsules." In Polyurea. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-99450-7.00021-6.

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Wong, Li Wen, Mohammad Fahimizadeh, Joash Ban Lee Tan, and Pooria Pasbakhsh. "Polyurea microcapsules as effective carriers for biomedical and agricultural applications." In Polyurea. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-99450-7.00019-8.

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Conference papers on the topic "Polyurea Microcapsules"

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Baltaeva, Madina, Katerina Stamer, and Maxim Orlov. "Complex Micro-Containers (CMC) Transporting Compartmentalized Reaction Mixture for Self-Healing Cement." In Middle East Oil, Gas and Geosciences Show. SPE, 2023. http://dx.doi.org/10.2118/213702-ms.

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Abstract Zonal isolation and cement sheath integrity are vital for a consistent oil and gas production process in an economic and environmentally conscious manner. However, cement is a brittle material that can fail under repeated application of stresses. The objective of this research is developing a novel material Complex micro-containers (CMC) to induce autonomous self-healing properties to the cement using the mechanism of a self-expanding polyurethane foam formation in a crack area. Complex micro-containers (CMC) consist of polyol-loaded polyurea (PUa) micro- and nanocapsules loaded insid
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Journal articles
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