A new UV-curable PU resin obtained through a nonisocyanate process and used as a hydrophilic textile treatment |
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Authors: | Jing-Zhong Hwang Shih-Chieh Wang Po-Chen Chen Chi-Yuan Huang Jen-Taut Yeh Kan-Nan Chen |
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Affiliation: | 1. Department of Chemistry, Tamkang University, Tamsui, Taiwan, 251 3. Department of Materials Engineering, Tatung University, 40 Chungshan N. Road, 3rd Sec., Taipei, Taiwan, 104 4. Graduate Institute of Polymer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan, 106 5. Faculty of Chemistry and Material Science, Hubei University, Wuhan, China 2. Department of Chemical and Material Engineering, Tamkang University, Tamsui, Taiwan, 251
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Abstract: | Oligo-fluorosiloxane (DFOS) and epoxy-containing oligo-fluorosiloxane (DFEHOS) were synthesized by the hydrolytic condensation reaction to modify 3, 4-epoxycyclohexylmethyl-3, 4-epoxycyclohexanecarboxylate (ERL-4221) for potential application in LED packaging. The chemical structures of DFOS and DFEHOS were characterized by Fourier transform infrared (FT-IR), 29Si nuclear magnetic resonance (29Si NMR), and gel permeation chromatography (GPC). The thermal behavior, mechanical properties, morphologies of impact fracture surfaces, surface wettability and absorbency of the modified epoxy resins were examined by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), tensile and impact testing, scanning electron microscopy (SEM), and contact angle measurement, respectively. The experimental results indicated that the contact angles, surface energies and water absorption ratios of the modified epoxy resins were effectively improved by the introduction of oligo-fluorosiloxanes. Compared to neat epoxy resin, the thermal stabilities of DFEHOS-modified epoxy resins were basically kept, and that of DFOS-modified epoxy resins were slightly depressed with the increasing content of modifiers. As the additive quantity of modifiers was about 5pph to 15pph relative to ERL-4221, good thermal stability, fracture toughness and surface hydrophobicity of the modified epoxy resin was exhibited, and the cured DFEHOS-10 that embraced the relatively optimum comprehensive property was possible for LED encapsulation. Moreover, the reactable groups formed during hydrolytic condensation in DFOS and DFEHOS made good compatibilities between the modifiers and the epoxy matrix. |
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