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Preparation and Properties of Polyaminosiloxane Modified Polyester Waterborne Polyurethane

C.-S. Xu, M.-T. Wu, L. Ouyang, Z.-S. Cai, Y. Ren, S.-F. Lu and W.-Z. Shi

Abstract

In this study, a organosilicon modified waterborne polyurethane (WPU) is synthesized with polyethylene glycol 1,4-butanediol adipate ester diol (PBA) to form the soft segment, dimethylolpropionic acid (DMPA) as the hydrophilic chain extender, and isophorone diisocyanate as the hard segment to synthesize the WPU prepolymer, and aminoethyl aminopropyl dimethicone (AEAPS) as the graft chain extender. The properties of the formed WPU films are then characterized by using Fourier transform infrared spectrometry, thermogravimetric analysis, X-ray diffraction, and dynamic mechanical analysis. It is found that when the amount of AEAPS in the WPU is increased from 0 to 30 wt%, the particle size of the AEAPS modified WPU emulsion is increased from 84.8 nm to 271.9 nm and maintained high centrifugal stability. Moreover, the water absorption of the WPU film is reduced from 43.4% to 24.1%, and the hardness is enhanced from 3H to 5H, while the glass-transition temperature (Tg) of the soft segment of the modified WPU shifts from -37.4 °C to -44.3 °C, and the Tg of the hard segment shifts from 73.6 °C to 118.1 °C. Therefore, the overall performance of AEAPS modified WPU is improved.


Mail address: Chengshu Xu, School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an Shaanxi 710048, PRC, E-mail:

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Received: 2019-05-19
Accepted: 2019-12-01
Published Online: 2020-04-09
Published in Print: 2020-04-29

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