Star-shaped waterborne polyurethane (SWPU) was synthesized by prepolymer method from isophorone diisocyanate (IPDI),polytetrahydrofuran (PTMG),poly-propylene glycerol (PPG-3),1,4-butanediol (BDO) and 2,2-dihydroxymethyl propionic acid (DMPA).The structure of SWPU was characterized by FT-IR and 1H-NMR spectra.SWPU showed higher number-average molecular weight and weight-average molecular weight.With the increase in PPG-3 content,the water resistance and mechanical properties of WPU film were improved.When PPG-3 content was 3% (mole fraction),the number-average molecular weight of SWPU was 4440g/mol,the emulsion was stable and the obtained film showed the highest tensile strength (52.7MPa) and elongation at break (444%).Its water contact was 64.1° and water absorption rate was 10.3%.Moreover,the introduction of PPG-3 helped to improve the thermal stability and glass-transition temperature.
Dang Haichun, Wu Weiling, Lv Jiamin, Xu Zhaozan
. Preparation and property of star-shaped waterborne polyurethane film with high tensile strength[J]. New Chemical Materials, 2022
, 50(1)
: 108
-112
.
DOI: 10.19817/j.cnki.issn1006-3536.2022.01.022
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