S1.1. Materials
Siloxane monomers including a (3-aminopropyl)triethoxysilane (KH-550), a (3-Glycidyloxypropyl)triethoxysilane (A-1871) and a triethoxyvinylsilane (A-151) were purchased from Hubei Jianghan New Materials Co.,Ltd, Both 1,3-Propanediol (PDO, AR) and Tris(dimethylaminomethyl)phenol (DMP-30) were obtained from Macklin Biochemical Co., Ltd. Methyl Tetrahydrophthalic Anhydride (MTHPA, mixture of isomers) were purchased from Qihua Chemical Co., Ltd. Epoxy resin, based on a bisphenol A diglycidyl ether (DGEBA, E51, epoxy value: 0.48 ~ 0.54) was purchased from Guangzhou Suixin Fine Chemical Co., Ltd. Solvents such as ethanol and acetone are provided by Guanghua Sci-Tech Co., Ltd. All chemicals were used as received without a further purification.