UV-curing of hyperbranched polyurethane acrylate-polyurethane diacrylate/SiO2 dispersion and TGA/FTIR study of cured films

Abstract

UV-curable hyperbranched polyurethane acrylate-polyurethane diacrylate/SiO 2 dispersion (HBPUA-PUDA/SiO 2 ) was prepared with isophorone diisocyanate (IPDI), hyperbranched polyester Boltorn H20 (H20), hydroxy-ethyl acrylate (HEA), polyethyleneglycol (PEG-200) and nano-SiO 2 . The UV curing kinetics of the films was investigated by FTIR. The results show that the curing speed of the films increases with the adding of nano-SiO 2 and decreases with the adding of PUDA due to the slower chain movement. The thermal stability of the HBPUA-PUDA/SiO 2 films was studied by using thermogravimetric analysis coupled with Fourier transform infrared spectroscopy (TGA/FTIR). The results show that all films exhibit two degradation stages located at about 320 and 440 °C corresponding to the degradation for hard segments of urethane-acrylate and the degradation for soft segment and polyester core. In addition, the results from the analysis of TGA/FTIR also indicate that the decomposition temperature of HBPUA-PUDA/SiO 2 film is 15 °C higher than that obtained for pure polymer. The degradation mechanism was proposed according to TGA/FTIR results.

Multifunctional Poly(ethylene glycol): Synthesis, Characterization, and Potential Applications of Dendritic–Linear–Dendritic Block Copolymer Hybrids

“…(Dimethylamino)pyridine (99%) (DMAP), trifluoroacetic acid sodium salt (98%), 3-mercaptopropionic acid (99%), poly(ethylene glycol) M w = 6000 g/mol (PEG6K) and M w = 20 000 g/mol (PEG20K), chromium(III) acetylacetonate (97%) (Cr(3)), copper(I) bromide (Cu(I)Br, 98%), carbon disulfide (CS 2 , 99%), styrene (99%), N,N,N′,N″,N″-pentamethyldiethylenetriamine (PMDETA, 99%), and α-bromoisobutyryl bromide (Br-eBiB, 99%) were obtained from Sigma-Aldrich. Methanol-d 4 , chloroform-d (CDCl 3 ) (99.8%), and dimethyl-d 6 sulfoxide (99.8%) (DMSO-d 6 ) were acquired from Cil. Chloroform (HPCL grade) (CHCl 3 ), diethyl ether (analytical reagent grade) (ether), and toluene (HPLC grade) were acquired from Fisher Chemicals.…”

“…H NMR (400 MHz, CDCl 3 ): δ (ppm)6.54 (q, 8H, −CH (allyl)), 5.27−5.18 (q, 16H, −CHCH 2 (allyl)), 5.27−5.18 (q, 16H, CH 2 −O (allyl)), 4.21 (q, 12H, −CH 2 −OCO− (bis-MPA)), 3.31 (s, 1828H, CH 2 −CH 2 −O− (PEG)), 2.60 (q, 64H, CH 2 −CHCH 2 (allyl)), 1.20−1.09 (q, 18H, −CH 3 (Bis-MPA)) 13. C NMR (100 MHz, CDCl 3 ): δ (ppm) 172.3 (1C, −COO− (allyl)), 172 (1C, −COO− (bis-MPA, allyl)), 138.3 (1C, −C (allyl)), 117.6 (1C, CH 2 (allyl)), 72.3 (1C, −CH 2 −O (allyl)), 70.75 (2C, −CH 2 − CH 2 −O (PEG)), 68.0−64.1 (1C, −CH 2 −O (bis-MPA)), 50.2 (1C, −COO−C−((CH 2 −OH) 2 , CH 3 ) (bis-MPA)), 49.5 (1C, −COOH− C−((CH 2 −OR) 2 , CH 3 ) (bis-MPA)), 48.1 (1C, −COO−C−(CH 2 − OH, CH 3 , CH 2 −OR) (bis−MPA)), 46.2, 45.5 (1C,−COO−C− ((CH 2 −OR) 2 , CH 3 ) (bis-MPA)), 29.7 (1C, −CH 2 −CC (allyl)), 29.0 (1C, −CH 2 −COO (allyl)) 17.8 (1C, −CH 3 (bis-MPA)).…”

UV‐curable acrylate‐based nanocomposites: effect of polyaniline additives on the curing performance

“…Additives and fillers are normally added to provide different properties in composites/nanocomposites depending on the end application. Possible effects from addition of different components on UV curing have been studied from which reports on modified clay, silane‐grafted silica nanoparticles or acrylate functional polydimethylsiloxane in polyester acrylate (PEA), and nano‐SiO 2 or clay in polyurethane acrylate matrix can be mentioned. Such components might interfere with the curing reactions in many ways such as absorbing UV light (as seen for metal oxides), thus giving rise to a light intensity gradient through the coating depth and an inhomogeneous cure.…”

Characterization and Properties of UV-Curable Hyperbranched Polyurethane Acrylate-Polyurethane Diacrylate/SiO2 Hybrid Coatings

“…19 [20][21][22][23] In our previous work, hyperbranched polyurethane acrylate (HBPUA) and hyperbranched polyurethane acrylate-polyurethane diacrylate (HBPUA-PUDA) and organic-modified SiO 2 were synthesized and characterized in detail, the results were reported in Ref. [24,25]. In this study, a series of organic-inorganic hybrid coatings were prepared based on HBPUA-PUDA and organic SiO 2 .…”

“…[24]. In this paper, silica sol was prepared with TEOS and MPTMS, the molar ratio of TEOS to MPTMS was 3:1.…”