caa a22 4500 463224884 CHVBK 20180405153223.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s10853-006-0606-6 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0606-6 The permeability and stability of microencapsulated epoxy resins [Elektronische Daten] [Li Yuan, Guo-Zheng Liang, Jian-Qiang Xie, Lan Li, Jing Guo] Microcapsules containing self-healing agents have been introduced into polymer to self-heal the microcracks and toughen the brittle matrix. Poly(urea-formaldehyde) (PUF) microcapsules containing epoxy resins are potential for the self-healing and toughening polymer. The resistance to medium surroundings of microcapsules is required. In the present study, PUF microcapsules containing epoxy resins were prepared by in situ polymerization. The effects of diameter, surface morphology and wall thickness on the permeability and stability of microcapsules in thermal and solvent surroundings were investigated. The morphology of microcapsule was investigated using optical microscope (OM), metalloscope (MS) and scanning electron microscope (SEM), respectively. The composition on the surface of microcapsule was analyzed by using energy dispersive analysis of X-ray (EDAX). The thermal properties of microcapsules were investigated using differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA). The thermal permeability of core increases and the stability of microcapsule decreases with the enhancement of heating temperature mainly due to the expansion of epoxy resins below 251°C and the decomposition of PUF above 251°C. At room temperature, the permeability constants of core materials of microcapsules in acetone solvent are small and they are 1.20×10−3ms−1, 1.39×10−3ms−1 and 1.60×10−3ms−1 corresponding to the microcapsules with diameters of 400±50μm, 230±40μm and 120±30μm. Increasing the surface smoothness, diameter and wall thickness can decrease the permeability and improve the stability of microcapsules in thermal and solvent surroundings. Springer Science+Business Media, LLC, 2007 Yuan Li Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, 710072, Xi'an, P.R. China aut Liang Guo-Zheng Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, 710072, Xi'an, P.R. China aut Xie Jian-Qiang Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, 710072, Xi'an, P.R. China aut Li Lan Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, 710072, Xi'an, P.R. China aut Guo Jing Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, 710072, Xi'an, P.R. China aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/12(2007-06-01), 4390-4397 0022-2461 42:12<4390 2007 42 10853 https://doi.org/10.1007/s10853-006-0606-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0606-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yuan Li Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, 710072, Xi'an, P.R. China aut NATIONALLICENCE 700 1- Liang Guo-Zheng Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, 710072, Xi'an, P.R. China aut NATIONALLICENCE 700 1- Xie Jian-Qiang Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, 710072, Xi'an, P.R. China aut NATIONALLICENCE 700 1- Li Lan Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, 710072, Xi'an, P.R. China aut NATIONALLICENCE 700 1- Guo Jing Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, 710072, Xi'an, P.R. China aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/12(2007-06-01), 4390-4397 0022-2461 42:12<4390 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer