Effect of Macromolecular Nucleating Agent on Crystallization Behavior of PBA Waterborne Polyurethane
Waterborne polyurethane(WPU)with a number-average molecular weight of 9 270 was made via poly(1,4-butanediol adipate)(PBA),hexamethylene diisocyanate(HDI)and 2,2-dimethylolpropionic acid(DMPA).WPU was added to PBA aqueous polyurethane(Prepared with PBA,HDI,isophorone diisocyanate(IPDI),DMPA,etc.as the main raw materials,with a number-average molecular weight of 28 700)as a macromolecular nucleating agent,and the effects of the amount of nucleating agent on the crystallization properties of WPU were studied.The results show that the macromolecular nucleating agent has a high thermal crystallization temperature,which increases the thermal crystallization temperature,crystallization rate and crystallinity of WPU,and enhances the mechanical properties of WPU film.When the mass fraction of macromolecular nucleating agent is 20%(3 g),the crystallization temperature of PBA in WPU is 19.6℃,the crystallinity is 47.7%,and the tensile fracture strength is 11.7 MPa.
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