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Interfacial Polycondensation Synthesis of Optical Sensitive Polyurea Microparticle with Micrometre Size
LAI Weidong *,FENG Hongguang,LI Xinzheng
College of Physics Science and Technology, Hebei University, Baoding, Hebei 071002
*Correspondence author
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Funding: National Nature Science Foundation of China （No.No.60877010), Specialized Research Fund for the Doctoral Program of Higher Education of China）
Opened online:17 January 2014
Accepted by: none
Citation: LAI Weidong,FENG Hongguang,LI Xinzheng.Interfacial Polycondensation Synthesis of Optical Sensitive Polyurea Microparticle with Micrometre Size[OL]. [17 January 2014] http://en.paper.edu.cn/en_releasepaper/content/4581793
 
 
In this paper, TMPTA prepolymer resin and photoinitiators of ITX/TPO have been encapsulated in core-shell structured microcapsules as optical responding ingredients based on interfacial polycondensation method. FT-IR spectra detection presents that polyurea structured microcapsule shell has been formed through the polycondensation reaction on the sheared O/W interface between isocyanate bonds of IPDI and amino end-groups of TEPA. The synthesized microcapsule has regular core-shell structure with the diameter of about 0.455μm and shell thichkness of about 40nm. UV-visible absorption spectra indicates that the encapsulted ITX and TPO photoinitiators can efficiently absorb UV irradiation. Under exposure, the C=C bonds absorbance of the microencapsulated TMPTA decrease rapidly, and then nearly unchanged during further exposure after 30s. It implies that the optical response is achieved by C=C bond cleavage of TMPTA monomer initiated by the photoinitiator radicals, to form network polymers in microcapsules. The relative crosslinking rate of the polymer in microcapsule is calculated with its maximum as about 50%. Due to core polymer formation, the thermal phase change temperature of exposed microcapsules is narrowed and ranged from 105 to 205℃, compared with that from 125 to 260℃ of unexposed microcapsules. Furthermore, the image density decreament at longer irradiation time has also verified the optical responding function of the synthesized microcapsules in macroscopic viewpoint.
Keywords:Physical chemistry of materials; microcapsule; optical sensitive; interfacial polycondensation; polyurea
 
 
 

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