Toughness-increased phenolic resin and preparation thereof
AssigneeChung-Shan Institute of Science and Technology
InventorsJeng-Chang Yang, Chen-Chi Ma, Hon-Bin Chen, Chin-Yih Chen
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Abstract
A phenolic resin that increases its toughness by polydimethylsiloxane and a process of preparing the same is provided. Polydimethylsiloxane is added as a coupling agent in a γ-glycidoxypropyltrimethoxysilane-modified phenolic resin to improve the compatibility between polydimethylsiloxane and the phenolic resin. Then, tetraethoxysilane is added to conduct hydrolysis condensation and obtain tougher and thermally stable phenolic resin.
Claims15
A phenolic resin that increases its toughness by polydimethylsiloxane, which is a hydrolysis condensation product of a first precursor, a second precursor and tetraethoxysilane, wherein the first precursor includes a phenolic resin and γ-glycidoxypropyltrimethoxysilane, hydroxyl groups of the phenolic resin being grafted on epoxy group of γ-glycidoxypropyltrimethoxysilane, and the second precursor includes a coupling agent and hydroxyl-terminated polydimethylsiloxane, hydroxyl groups of polydimehtylsiloxane being grafted at a first terminal of the coupling agent and a second terminal of the coupling agent being branched siloxane structure.
A process of preparing phenolic resin that increases its toughness by polydmethylsiloxane, the process comprising:
- performing an open ring reaction of novalic resin by using γ-glycidoxypropyltrimethoxysilane to form the first precursor;
- reacting a coupling agent with hydroxyl-terminated polydimethylsiloxane to form a second precursor;
- using the first precursor, the second precursor and tetraethoxysilane for hydrolysis condensation to form the phenolic resin that increases its toughness by polydimethylsiloxane.
Dependencies are inferred from the claim text.