A kind of degradable flame retardant polystyrene block copolymer and preparation method thereof
A polystyrene block and polystyrene technology, applied in the field of degradable flame-retardant polystyrene block copolymer and its preparation, can solve the problems of difficult degradation of polystyrene products and environmental pollution
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Embodiment 1
[0029] In a three-necked flask equipped with a reflux condenser, a constant pressure dropping funnel, and a magnetic stirring device, add diethyldichlorophosphoramide (10mmol), triethylamine (10mmol) and twice the mass of diethyldichlorophosphoramide of chloroform, fully dissolved and mixed evenly; Weigh ethylene glycol (10 mmol) and dissolve it in twice the mass of chloroform, put it into a constant pressure dropping funnel, under an ice bath, remove the ice bath after dripping within 1 h, slowly After the temperature was raised to 70°C and refluxed for 6 hours, a chloroform solution of p-hydroxybenzoic acid (2.5 mmol) was added by injection with a disposable syringe, and the reaction was continued for 3 hours under reflux. After cooling to room temperature, the solvent was distilled off under reduced pressure. After suction filtration, the filtrate was collected again. Dissolve with chloroform, extract three times with distilled water, take the organic phase and distill off t...
Embodiment 2
[0031] The RAFT reagent 3-benzylsulfanylthiocarbonylsulfanylpropionic acid (1.0mmol) and 20ml of anhydrous tetrahydrofuran THF were added to the reactor. After the reaction temperature rose to 70°C, SOCl was slowly added dropwise. 2 (4.0mmol), the dropwise addition was completed and the reaction was completed for 2h. After the reaction was completed, the SOCl was distilled off under reduced pressure. 2 and THF to obtain 3-benzylsulfanylthiocarbonylsulfanyl propionyl chloride, which is dissolved in an appropriate amount of toluene.
[0032] Double-ended hydroxypolystyrene (1.0 mmol) was added to a 50 ml Schlenk bottle, and after evacuating nitrogen three times, N 2 Under the protection, add 30 ml of anhydrous toluene into a disposable syringe, heat it up to 70 °C, inject 1 ml of pyridine after the double-ended hydroxypolystyrene is completely dissolved, and stir for 30 min, then add the above 3-benzylsulfanylthiocarbonyl sulfide dropwise Alkyl propionyl chloride was heated to ...
Embodiment 3
[0034] Methacrylic acid (16.0 mmol), polystyrene macromolecular chain transfer agent (0.06 mmol), and azobisisobutyronitrile (0.02 mmol) were added to a 50 ml Schlenk bottle. 2 Under the protection, 20 mL of N,N-dimethylformamide DMF was added with a disposable syringe, reacted in an oil bath at 70 °C for 2 h, put into liquid nitrogen to quench the product to stop the reaction, and methanol / water was used as a precipitant, Precipitation was repeated 3 times, and dried under vacuum at 45° C. to constant weight to obtain PS-b-PMAA with a yield of 71.5%.
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