Citation: Wen-qing Xu, Ya-dong Lv, Mi-qiu Kong, Ya-jiang Huang, Guang-xian Li. Study on Properties of Waterborne Polyurethane/Polydopamine Nanoparticles Prepared by in situ Polymerization[J]. Acta Polymerica Sinica, ;2019, 50(7): 710-720. doi: 10.11777/j.issn1000-3304.2018.18250 shu

Study on Properties of Waterborne Polyurethane/Polydopamine Nanoparticles Prepared by in situ Polymerization

Wen-qing Xu ¹ ,
Ya-dong Lv ^2,3 ,
Mi-qiu Kong ^1,, ,
Ya-jiang Huang ^2,3 ,
Guang-xian Li ^2,3,,

Corresponding author: Mi-qiu Kong, miqiukong@scu.edu.cn Guang-xian Li, guangxianli@scu.edu.cn
Received Date: 23 November 2018
Revised Date: 12 February 2019
Available Online: 12 March 2019

Waterborne polyurethane (WPU)/polydopamine (PDA) nanoparticle composites were successfully fabricated via in situ polymerization and effects of PDA nanoparticles on thermal properties, mechanical properties and anti-ultraviolet aging properties of WPU were investigated. Firstly, PDA nanoparticles with an average size of 150 nm were synthesized through spontaneous oxidation polymerization of dopamine hydrochloride in sodium hydroxide (NaOH) solution at 50 °C for 5 h under stirring. And it was retained in aqueous dispersion. Then, isophoeone diisocyanate (IPDI), polytetrahydrofuran diol (PTMG-1000), 2,2-dimethylol propionic acid (DMPA) were reacted to prepare the hydrophilic poliurethane prepolymer at 80 °C for 2 h under stirring, and then PDA nanoparticles in aqueous dispersion were added into the prepolymer to emulsify simultaneously for 30 min. Finally, 1,4-butanediol (BDO) was used as a small molecule chain extender to prepare WPU/PDA composites. It was found that both the thermostability and mechanical properties of WPU is enchanced by the addition of PDA nanoparticles. Especially when the concentration of PDA nanoparticles is 0.5 wt%, the initial degradation temperature of WPU/PDA composites is enhanced by 22.7 °C, and the tensile strength and Young’s modulus is increased by 37% and 78%, respectively, compared with pure WPU. Meanwhile, with the addition of PDA nanoparticles, the formation of cracks on the surface of WPU after ultraviolet irradiation is obviously hindered, and the decline of thermostability caused by ultraviolet irradiation is effectively suppressed. This can be mainly attributed to the impediment of the bond breakage during the ultraviolet irradiation due to the interaction of PDA nanoparticles with the urethane bonds and urea bonds of the hard segment of WPU.
- Polydopamine,
- Waterborne Polyurethane,
- Mechanical properties,
- Anti-ultraviolet capability,
- Thermostability
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