Citation: . MODIFIED ULTRAVIOLET-CURABLE WATER DISPERSIBLE POLYURETHANE-ACRYLATES*[J]. Chinese Journal of Polymer Science, ;2001, 19(2): 175-181. shu

MODIFIED ULTRAVIOLET-CURABLE WATER DISPERSIBLE POLYURETHANE-ACRYLATES*

Received Date: 4 October 2000

Three kinds of UV-curable self-emulsified polyurethane-acrylate (PUA) prepolymer, i.e., conventional, chainextended and grafted PUAs, were prepared. The relatively small particle size of the PUA dispersions indicates that the PUAprepolymers exhibit sufficient aqueous dispersibility. The PUA prepolymers can substantially lower the interfacial tension ofwater. Chain-extended PUA dispersions exhibit pseudoplastic behavior and thixotropy to a greater extent than do theirconventional counterpart. The chain-extended and grafted PUA photocure to higher conversion than do the conventional PU equivalent.The results of DSC measurement suggest that there exists phase mixing between the hard and the soft segment phases for the PUAs based on PEG 400 that is the comparatively short soft segment in the prepolymer.For the PUA prepolymers based on PEG having higher Mn values,chain-extending and grafting could impede the phase separation between the hard and the soft segment domains.The adhesion,impact strength and flexibility of the photocured films were tested.
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