Positron annihilation lifetime spectroscopy study on the structural relaxation of phenylmethylsiloxane-modified epoxy hybrids at different aging temperatures

Hsu, Chia-Wen; Chen‐Chi, M.; Tan, Chung‐Sung; Li, Hsun-Tien

doi:10.1016/j.matchemphys.2015.05.006

Cited by 2 publications

(1 citation statement)

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“…Use of silicon-based epoxy hybrids, , doping with UV-resistant additives, and hydrogenation of BPA-type epoxy resins − have been proposed to abate this structural degradation. Of these solutions, the hydrogenation route offers the best techno-economic viability as silicon-based epoxy resins are typified by complicated synthesis routes and cost-prohibitive raw materials, whereas UV-resistant additives show weaker resistance to yellowing.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenation of Bisphenol A-Type Epoxy Resin (BE186) over Vulcan XC72-Supported Rh and Rh–Pt Catalysts in Ethyl Acetate-Containing Water

Bhattacharjee

Lai

et al. 2019

Ind. Eng. Chem. Res.

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This study demonstrates the hydrogenation of a bisphenol A-type epoxy resin (BE186) through solvent selection, development of a catalyst for aromatic ring hydrogenation, and control of epoxy loss. A functional greener solvent, water in ethyl acetate, was proposed based on solvatochromic parameters, high α and low β. RhO x present in Vulcan XC72supported monometallic Rh and bimetallic Rh−Pt catalysts prepared by the polyol method acted as a promoter for hydrogenation. The hydrogenation pathway to control epoxy loss was proposed through changes of the reactant to the catalyst ratio and temperature. Though Rh−Pt catalysts were superior to Rh for aromatic ring hydrogenation, they led to higher epoxy loss owing to excessive C−O bond cleavage. Using Rh 5 /Vulcan XC72-polyol, 3 wt % water in ethyl acetate, and a reactant to catalyst ratio of 100:1, complete hydrogenation of BE186 with 3.4% epoxy loss was achieved at a H 2 pressure of 1000 psi and 60 °C for 3.5 h.

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