Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Functional Materials

Preparation and Properties of UV-Curing Functional Materials

Author ChenXue
Tutor WangJiaXi
School Hebei University of Technology
Course Polymer Chemistry and Physics
Keywords UV-curing hydrosilylation low surface energy organosilicone organofluoro polyurethane acrylates
Type Master's thesis
Year 2010
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UV-curing technology is an environmentally friendly technology. The polymer with lowsurface energy has been rapidly developed and used in many areas due to its unique properties,and the researches on this material has becoming hot spots. The comments on the UV curingtechnology and low surface energy materials have been remarked.The novel light-cured monomer organofluoro and silicone modified acrylates with thelow-surface-energy and better ratio of cost to properties were synthesized through thehydrosilylation reaction. The reaction process was traced and the products were characterized by1H-NMR and FT-IR technology. The kinetic nature of UV initiated polymerization was examinedby real-time infrared spectroscopy (RT-IR). The results indicated that the higher conversion ofSi-H bonds in the hydrosilylation is, the higher UV curing rate and the conversion of final doublebonds are. The water absorption ratio of light-cured films reduced as increase of dosage of thesilicone and organofluoro group, water absorption ratio of curing membranes reduced from 8.1%to 2.3%. The UV-gel with the methyl hydro-silicone oil (10.86%) and perfluoroalkylethylacrylates ( 0.96%) has a better ratio of cost to properties. The surface energy of silicone graftedoctadecyl acrylate、HDDA can be as low as 26.88mN / m, while the lowest surface energy ofsilicone grafted lauryl acrylate、HDDA is 40.13 mN / m. Moveover the general performance ofsilicone-graft- octadecyl acrylate、HDDA was better than that of silicone-graft-lauryl acrylate、HDDA. In addition, the further heat processes can improve the gel fraction、hardness、impactstrength of UV- curable films,but the water absorption increased. A series of polyurethane acrylates with different structures and different number offunctional groups were made up from the reaction of isophorone diisocyanate, diols,trimethylolpropane,β-hydroxy ethyl methylacrylic ester. The products were characterized by1H-NMR technology. The PUA which contains amino has poor thermal stability and resistanceto yellowing.The presence of flexible chain segments and diluents will significantly reduce theviscosity. The viscosity of IPDI - PEG400-HEMA is 7400 mPa ? s, and the viscosity ofIPDI-EPO3000-HEMA is 3500 mPa ? s at 60℃, this shows that the product has the smallerviscosity which possesses longer flexible chain segments; Diluent makes chain segmentmovement easier during curing process, thereby increasing the rate of curing; The flexiblechains can improve flexibility of the curing membrane, but also reduces its hardness.

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