Copolymer, and preparation method and application thereof
A copolymer and reaction technology, applied in chemical instruments and methods, fluorescence/phosphorescence, luminescent materials, etc., can solve the problems of limited application of luminescent polymers, difficult luminescence characteristics, etc., and achieve good water solubility, high luminous efficiency, and spectral response. wide effect
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Embodiment 1
[0071] The present embodiment is a kind of preparation method of copolymer, comprises the following steps:
[0072] S1, the preparation of brominated lactide:
[0073] Take (28.8g 0.2mol) of L-lactide (L-Lactide) and (39.15g 0.22mol) of N-bromosuccinimide (NBS) and reflux in benzene for 24h until the lactide reaction is complete . After the reaction was completed, it was cooled to room temperature (about 25° C.), and the solvent was removed to obtain the crude product as a pale yellow solid.
[0074] The light yellow solid of the crude product was first extracted once with dichloromethane and 1mol / L sodium thiosulfate solution, then extracted twice with saturated sodium chloride solution, the organic phase was separated, the solvent was removed, and recrystallized with ethyl acetate to obtain White needle-like crystal brominated lactide (Br-Lactide).
[0075] Preparation of S2, methylene lactide:
[0076] Bromolactide (5.0 g) was dissolved in dichloromethane, triethylamine...
Embodiment 2
[0083] The present embodiment is a kind of preparation method of copolymer, comprises the following steps:
[0084] S1, the preparation of brominated lactide:
[0085] Take (28.8g 0.2mol) of L-lactide (L-Lactide) and (39.15g 0.22mol) of N-bromosuccinimide (NBS) and reflux in benzene for 24h until the lactide reaction is complete . After the reaction was completed, it was cooled to room temperature, and the solvent was removed to obtain the crude product as a pale yellow solid.
[0086] The crude product light yellow solid was first extracted once with dichloromethane and 1mol / L sodium thiosulfate, then extracted twice with saturated sodium chloride solution, the organic phase was separated, the solvent was removed, and recrystallized with ethyl acetate to obtain a white Needle crystal brominated lactide (Br-Lactide).
[0087] Preparation of S2, methylene lactide:
[0088] Bromolactide (5.0 g) was dissolved in dichloromethane, and triethylamine (TEA, 2.72 g) was added dropw...
Embodiment 3
[0095] The present embodiment is a kind of preparation method of copolymer, comprises the following steps:
[0096] S1, the preparation of brominated lactide:
[0097] Take (28.8g 0.2mol) of L-lactide (L-Lactide) and (39.15g 0.22mol) of N-bromosuccinimide (NBS) and reflux in benzene for 24h until the lactide reaction is complete . After the reaction was completed, it was cooled to room temperature, and the solvent was removed to obtain the crude product as a pale yellow solid.
[0098] The crude product light yellow solid was first extracted once with dichloromethane and 1mol / L sodium thiosulfate, then extracted twice with saturated sodium chloride solution, the organic phase was separated, the solvent was removed, and recrystallized with ethyl acetate to obtain a white Needle crystal brominated lactide (Br-Lactide).
[0099] Preparation of S2, methylene lactide:
[0100] Bromolactide (5.0 g) was dissolved in dichloromethane, and triethylamine (TEA, 2.72 g) was added dropw...
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