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- W2135673235 abstract "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 η5-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." @default.
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- W2135673235 date "2003-04-01" @default.
- W2135673235 modified "2023-10-16" @default.
- W2135673235 title "Oxidation of Stereo-regular Poly(styrene-co-4-methylstyrene) by Cobalt(II) Acetate Tetrahydrate/Sodium Bromide Catalyst" @default.
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- W2135673235 doi "https://doi.org/10.1002/jccs.200300031" @default.
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