- 作者: 洪金龍
- 作者服務機構: Institute of Materials Science and Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, R.O.C.
- 中文摘要: Chemical modification on the stereo-regular poly(styrene-co-4-methylstyrene) (sPS-PMS) was attempted in this study. Metallocene copolymerization of styrene (St) and 4-methylstyrene (MSt) was performed by using h5-pentamethylcyclopentadienyl-titanium(IV)tributoxide (Cp*Ti(Obu)3)/methylaluminoxane (MAO)/tri-iso-butylaluminum (TIBA) catalyst in the bulk state. Cobalt(II) catalyst was then applied to oxidize the benzylic methyl group on the MSt units of the resulting sPS-PMS copolymer. Both aldehyde and carboxylic acid in the oxidized products were resolved by the FTIR and 1H NMR. The oxidized sPS-PMSs exhibit a low and a high-temperature Tg and Tm corresponding to the transitions in the amorphous and the crystalline regions. Hydrogen-bond and polar interactions between the aldehyde and carboxylic acids tend to interrupt the regular chain packing of the oxidized sPS-PMS, resulting in the lowering of Tm with oxidation level. The oxidized sPS-PMS showed better adhesion to glass fiber than pure sPS-PMS copolymer as evaluated from the respective SEM fractured micrographs.
- 英文摘要: --
- 中文關鍵字: Oxidation; Syndiotactic; Poly(styrene-co-4-methylstyrene).
- 英文關鍵字: Oxidation; Syndiotactic; Poly(styrene-co-4-methylstyrene).