Interfacial Polycondensation Synthesis of Optically Sensitive Polyurea Microcapsule
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...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2014/597578 |
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| author | Weidong Lai Xinzheng Li Huiqing Liu Lu Han Yajun Zhao Xiaowei Li |
| author_facet | Weidong Lai Xinzheng Li Huiqing Liu Lu Han Yajun Zhao Xiaowei Li |
| author_sort | Weidong Lai |
| collection | DOAJ |
| description | 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 microencapsulated TMPTA decreased rapidly and then nearly unchanged during further exposure after 30 s. This implied that the optical response was achieved by C=C bond cleavage of TMPTA monomer initiated by the photoinitiator radicals, to form network polymers in microcapsules. The relative crosslinking rate was about 50%. Due to core polymer formation, the thermal phase change temperature of exposed microcapsules was narrowed and ranged from 105 to 205°C, compared with that from 125 to 260°C of unexposed microcapsules. Furthermore, the image density decrease at longer irradiation time had also verified the optical responding function of the synthesized microcapsules in macroscopic viewpoint. |
| format | Article |
| id | doaj-art-85af9ef15cb2491f947d480b3cf2578c |
| institution | Kabale University |
| issn | 2090-9063 2090-9071 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Chemistry |
| spelling | doaj-art-85af9ef15cb2491f947d480b3cf2578c2025-02-03T05:45:26ZengWileyJournal of Chemistry2090-90632090-90712014-01-01201410.1155/2014/597578597578Interfacial Polycondensation Synthesis of Optically Sensitive Polyurea MicrocapsuleWeidong Lai0Xinzheng Li1Huiqing Liu2Lu Han3Yajun Zhao4Xiaowei Li5Hebei Key Lab of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding, Hebei 071002, ChinaDepartment of Sciences, Hebei University of Science and Technology, Shijiazhuang, Hebei 050018, ChinaHebei Key Lab of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding, Hebei 071002, ChinaHebei Key Lab of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding, Hebei 071002, ChinaHebei Key Lab of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding, Hebei 071002, ChinaHebei Key Lab of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding, Hebei 071002, ChinaTMPTA 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 microencapsulated TMPTA decreased rapidly and then nearly unchanged during further exposure after 30 s. This implied that the optical response was achieved by C=C bond cleavage of TMPTA monomer initiated by the photoinitiator radicals, to form network polymers in microcapsules. The relative crosslinking rate was about 50%. Due to core polymer formation, the thermal phase change temperature of exposed microcapsules was narrowed and ranged from 105 to 205°C, compared with that from 125 to 260°C of unexposed microcapsules. Furthermore, the image density decrease at longer irradiation time had also verified the optical responding function of the synthesized microcapsules in macroscopic viewpoint.http://dx.doi.org/10.1155/2014/597578 |
| spellingShingle | Weidong Lai Xinzheng Li Huiqing Liu Lu Han Yajun Zhao Xiaowei Li Interfacial Polycondensation Synthesis of Optically Sensitive Polyurea Microcapsule Journal of Chemistry |
| title | Interfacial Polycondensation Synthesis of Optically Sensitive Polyurea Microcapsule |
| title_full | Interfacial Polycondensation Synthesis of Optically Sensitive Polyurea Microcapsule |
| title_fullStr | Interfacial Polycondensation Synthesis of Optically Sensitive Polyurea Microcapsule |
| title_full_unstemmed | Interfacial Polycondensation Synthesis of Optically Sensitive Polyurea Microcapsule |
| title_short | Interfacial Polycondensation Synthesis of Optically Sensitive Polyurea Microcapsule |
| title_sort | interfacial polycondensation synthesis of optically sensitive polyurea microcapsule |
| url | http://dx.doi.org/10.1155/2014/597578 |
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