Preparation and Characterization of UV Curable Hyperbranched Polyurethane Acrylate with Adjustable Double Bond†

doi:10.7503/cjcu20150878

Abstract

Abstract:

The hyperbranched polyurethane with six hydroxyl-terminated groups(HBPU-OH) was synthesized by glycerol as the core and diethanolamine(DEOA), isophorone diisocyanate(IPDI) as the branched monomer. Through further reacting with the half adduct of isocyanate-hydroxyethyl acrylate(IPDI-HEA), the obtained HBPU-OH was transformed into the UV-curable hyperbranched polyurethane acrylate(HBPUA), where the number of acrylic double bonds is adjustable. The Fourier transform infrared spectroscopy(FTIR) and nuclear magnetic resonance spectroscopy(¹³C NMR) were used to analyze the molecular structure of HBPUA and HBPU-OH. The results show that HBPUA was successfully synthesized. The differential scanning calorimeter(DSC) analyses indicate that displays the temperature of glass transition(T_g=67.8 ℃) of HBPUA is lower than the T_g(110.0 ℃) of HBPU-OH can be attributed to the introducing of hydroxyethyl acrylate. Furthermore, the thermal gravimetric analysis(TG) results show that both of the HBPU-OH and HBPUA have similar three-stage decomposition process.

Key words: UV curable, Core hyperbranched polyurethane acrylate, Adjustable bouble bond

CLC Number:

O631
TQ323.8

TrendMD:

XU Zhaohua, CHEN Chan, SUN Ning, LI Heng, LI Yibiao. Preparation and Characterization of UV Curable Hyperbranched Polyurethane Acrylate with Adjustable Double Bond^†[J]. Chem. J. Chinese Universities, 2016, 37(6): 1224.

Figures/Tables 6

Scheme 1 Synthesis reaction of HBPU-OH

Scheme 2 Synthesis reaction of HBPUA

Fig.1 FTIR spectra of HBPU-OH(a) and HBPUA(b)

Fig.2 13C NMR spectrum of HBPUA

Fig.3 DSC curves of HBPU-OH(a) and HBPUA(b)

Fig.4 TGA curves of HBPU-OH(a) and HBPUA(b)

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