The Hyperbranched Macromolecular Photoinitiators Synthesis And Characterization, And

UV curing has become a well-accepted technology because of its distinct advantages. Photoinitiator systems play very important roles in UV curing technology. Compared with low-molecular weight photoinitiators, polymeric photoinitiator systems attract more attention because of their high reactivity, low odor and toxicity, and good storage stability.N,N-diethylol-3-amine methylpropionate has been synthesized via Michael addition of methyl acrylate and diethanolamine, and characterized by FTIR, MS, EA techniques, and so an. The hyperbraned poly(amine-ester)s with end active hydroxyl groups are synthesized, and characterized by FTIR, ~1H-NMR, GPC techniques, and so on. The results show that three hyperbranched polymers have the similar structures with objection. The optimize reaction conditions are as follows, temperature is 120℃, the reaction time of HPAE-1, HPAE-2 and HPAE-3 are 2.5 h, 5.0h and 7.5 h respectively.The end active hydroxyl groups of the hyperbranched poly(amine-ester)s were modified by succinic anhydride. Hyperbranched macrophotoinitiators were synthesized through polycondensation of 2-hydroxy-2-methyl-1- phenyl acetone (HMPP) and hyperbranched poly(amine-ester)s,and characterized by FTIR, ~1H-NMR, DSC-TGA, and so on.The UV-vis spectra of three hyperbranched macrophotoinitiators are similar and their maximal absorptions are near 320 nm. HPAE-1-SA-HMPP is 328 nm, HPAE-2- SA-HMPP is 329 nm, HPAE-3-SA-HMPP is 325 nm, a slight red shift. Fluorescence analysis of hyperbranched macrophotoinitiators is 400 nm and 500 nm. The initiator efficiency of macromolecules is slightly lower than HMPP.