Synthesis and characterizations of waterborne polyurethane modified with 3-aminopropyltriethoxysilane |
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Authors: | Lai Xiaojuan Li Xiaorui Wang Lei Shen Yiding |
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Affiliation: | (1) College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi’an, China |
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Abstract: | Waterborne polyurethane (WPU) was prepared by the reaction of isophorone isocyanate (IPDI), polyether polyol (PTMG1000), dimethylol
propionic acid (DMPA), and trimethylol propane (TMP) and 3-aminopropyltriethoxysilane (APTES) as coupling agent. The films
of the WPU were prepared by casting emulsions on Teflon surfaces. The structure of the polyurethane (PU) was characterized
by Fourier transform infrared spectrometer (FT-IR), thermogravimetry (TG), X-ray diffraction (XRD), and differential scanning
calorimeter (DSC). The mechanical properties and solvent absorption of the cast films were also measured quantificationally.
FT-IR indicates that –NH2 of APTES reacted with –NCO of PU prepolymer. TG analysis indicates that APTES can improve thermal stability of PU. XRD and
DSC show that crystallinity of PU decreased with the increase of w(APTES). It was found that greater mechanical properties of WPU were obtained when chemical networks were formed between PU
and APTES. As the mass fraction of APTES increases from 0% to 10%, water absorption decreased from 17% to 8%, ethanol absorption
decreased from 46% to 30%. The particle size increases with increase of w(APTES). |
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