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Interfacial polycondensation synthesis of optically sensitive polyurea microcapsule
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نویسنده
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lai w. ,li x. ,liu h. ,han l. ,zhao y. ,li x.
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منبع
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journal of chemistry - 2014 - دوره : 2014 - شماره : 0
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چکیده
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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 m 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. © 2014 weidong lai et al.
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آدرس
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hebei key lab of optic-electronic information and materials,college of physics science and technology,hebei university,baoding, China, department of sciences,hebei university of science and technology,shijiazhuang, China, hebei key lab of optic-electronic information and materials,college of physics science and technology,hebei university,baoding, China, hebei key lab of optic-electronic information and materials,college of physics science and technology,hebei university,baoding, China, hebei key lab of optic-electronic information and materials,college of physics science and technology,hebei university,baoding, China, hebei key lab of optic-electronic information and materials,college of physics science and technology,hebei university,baoding, China
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Authors
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