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- W4386792802 abstract "This research aimed to synthesize and characterize the hyperbranched epoxy resin synthesized by A2 + B4 polycondensation reaction consisting of bisphenol A (BPA) and polyethylene glycol (PEG) as A2 monomers, pentaerythritol as B4 branching monomer, and epoxide end group. There were varying PEG contents of 0, 5, 10, and 15 wt% of BPA. It was found that the synthesized resins could be confirmed by identifying the important chemical bond and possible structure by Fourier-transform infrared spectroscopy (FTIR) and H- and 13C-nuclear magnetic resonance (H-NMR and 13C-NMR) techniques. The 13C-NMR technique could identify the degree of branching (DB) of the synthesized resins. It was found that the degree of branching of the synthesized resins was higher than 0.5 in which it meant they were the hyperbranched polymers.� There was a high degree of branching when the content of PEG increased from 0.82 to 0.90. The study of thermal cure with diethylenetriamine (DETA) as a curing agent, both the synthesized hyperbranched epoxy systems and combined resins between the hyperbranched polymer and diglycidyl ether of bisphenol A (DGEBA) had the curing behavior following auto-catalytic reaction of ?est?k-Berggren equation. The hyperbranched epoxy resin system with 10 wt% PEG (HBE10P) and the combined resin system between DGEBA and hyperbranched epoxy with 10 wt% PEG (DH10P) provided thermal curing behavior and thermal properties appropriately. The ratio of DGEBA to HBE10P of 90:10 (D90H10) with 5 wt% photoinitiator provided high UV conversion, low gelation time, and suitable rheological and thermal properties. Furthermore, high temperature and high irradiation time provided the conversion; however, when the irradiation time was too much, the conversion decreased. Besides, UV intensity, reaction mechanism, and structure of resin affected glass transition temperature in which it was confirmed by the radius of gyration of the network segment measured by small-angle X-ray scattering (SAXS) technique." @default.
- W4386792802 created "2023-09-16" @default.
- W4386792802 creator A5058179752 @default.
- W4386792802 date "2023-09-15" @default.
- W4386792802 modified "2023-09-26" @default.
- W4386792802 title "The synthesis of hyperbranched epoxy resin for improvement of thermal, mechanical, and adhesion properties of epoxy adhesive" @default.
- W4386792802 doi "https://doi.org/10.58837/chula.the.2019.86" @default.
- W4386792802 hasPublicationYear "2023" @default.
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