Preparation method of cyclic polyester oligomer
A technology for cyclic polyester and oligomers, which is applied in the field of preparation of cyclic polyester oligomers, and can solve problems such as unfavorable product performance and accelerated curing time
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Embodiment 1
[0021] In a 50ml three-necked reaction flask equipped with a mechanical stirring device, add 20 milliliters of dry chlorobenzene and 0.15 grams of polybutylene terephthalate (PBT, Mw=45000, styrene standard), replace with nitrogen three times, stir and heat to 140°C, make the PBT dissolution system into a transparent solution, then add 0.02g of dimethyl tin oxide, react for 240 minutes, cool to 25°C, heat filter, and vacuum the filtrate to dry the solvent to obtain a white solid. The white solid was dissolved in dichloromethane, the solution was removed by column chromatography to remove the residual organotin catalyst, and the final product was obtained after drying. The reaction yield was 24%.
Embodiment 2
[0023] In a 100ml three-necked reaction flask equipped with a mechanical stirring device, add 40 milliliters of dry o-dichlorobenzene and 0.5 gram of polytrimethylene terephthalate (PTT, Mw=128000, styrene standard), replace with nitrogen three times, stir and heat to 190°C, make the PTT dissolution system become a transparent solution, then add 0.25g of dibutyltin oxide, react for 180 minutes, cool to 50°C, heat filter, and vacuum the filtrate to dry the solvent to obtain a white solid. The white solid was dissolved in chloroform, the solution was removed by column chromatography to remove the residual organotin catalyst, and the final product was obtained after drying. The reaction yield was 37%.
Embodiment 3
[0025] In a 500ml three-necked reaction flask equipped with a mechanical stirring device, add 250ml of dry naphthalene and 3g of polyethylene terephthalate PET (Mw=82000, styrene standard), replace with nitrogen three times, stir and heat to 210°C , so that the PET solution system becomes a transparent solution, then add 0.3g 1,1,6,6-tetra-n-methyl-1,6-ditin-2,5,7,10-tetraoxcyclodecane, and react for 45 minutes Afterwards, cool to 100°C, heat filter, and vacuum the filtrate to dry the solvent to obtain a white solid. The white solid was dissolved in ether, the solution was removed by column chromatography to remove the residual organotin catalyst, and the final product was obtained after drying. The reaction yield was 83%.
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