Abstract
A trehalose-based diallyl compound (I) was synthesized by the acetalization reaction of α,α-D-trehalose with 4-allyloxybenzaldehyde. Alternating copolymers containing trehalose units and siloxane units were synthesized by the hydrosilylation reaction of the diallyl monomer I and telechelic SiH-containing siloxanes in the presence of Karstedt’s catalyst. As the SiH-containing siloxanes, 1,1,3,3,5,5-hexamethyltrisiloxane with the molecular weight of 208 (II) and dimethylsiloxane oligomers with the molecular weights of ca. 600 (III) and ca. 1000 (IV) was used. The structure of the obtained copolymers were fully characterized with 1H-NMR and FT-IR spectroscopy. The weight average molecular weight (Mw) of the copolymers ranged from 5900 to 50000 (GPC). The copolymer with the highest Mw was obtained by the reaction of I and III in toluene at 80 °C for 72 h. All the polymers showed two glass transition temperatures (Tg), suggesting microphase separation. The lower Tg was around −110 °C, which did not depend on the length of the siloxane oligomer segment; and the higher Tg was ranging from 152 °C to 96 °C, which decreased with an increase in the length of the siloxane oligomer segment.
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Teramoto, N., Unosawa, M., Matsushima, S. et al. Synthesis and Properties of Thermoplastic Alternating Copolymers Containing Trehalose and Siloxane Units by Hydrosilylation Reaction. Polym J 39, 975–981 (2007). https://doi.org/10.1295/polymj.PJ2006279
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DOI: https://doi.org/10.1295/polymj.PJ2006279
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