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- W3136282595 abstract "The fluoro alcohol-terminated branched polyurethanes with different fluorine content (FABPU-0, FABPU-1 and FABPU-2) was successfully synthesized via step-by-step polymerization in which polytetramethylene oxide glycol (PTMG-2000) and 4,4′-diphenylmethane diisocyanate (MDI) were used as raw materials, 1,4- butanediol (BDO) as the chain extender, pentaerythritol as crosslinking agent, anhydrous ethanol (EtOH) or perfluorinated hexyl alcohol (S104) as end capping agent. The molecular structure and relative molecular weight of aromatic polyurethane (PU) and FABPU were characterized by means of Fourier-transform infrared (FTIR) and Gel permeation chromatography (GPC). The results showed that the average molecular weight of FABPUs increased compared with that of PU. The characterization results by thermogravimetric (TG) and X-ray diffraction (XRD) showed that the crystallinity of FABPU-2 was enhanced 148.3 %, as well as the thermal decomposition temperature was raised by 38 ℃. The yellowing resistance of FABPU and aromatic fluorine-free PU was investigated by the change of yellowness index (YI), chromatic aberration (ΔE). The results showed that compare with that of aromatic fluorine-free PU, YI of FABPU-2 decreased to 14.3 from 32.48, as well as ΔE reduced to 5.07 from 16.34. Moreover, the water contact angle of FABPU-2 increased to 141° from 89.3°. These indicated that the crosslinking of pentaerythitol and the introduction of fluorine obviously improved the hydrophobicity and yellowing resistance of aromatic PU." @default.
- W3136282595 created "2021-03-29" @default.
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- W3136282595 date "2021-06-01" @default.
- W3136282595 modified "2023-09-23" @default.
- W3136282595 title "Improvement for yellowing resistance of aromatic PU film by fluoro alcohol termination and branching modification" @default.
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- W3136282595 doi "https://doi.org/10.1016/j.porgcoat.2021.106227" @default.
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