Preparation method of polyphenylene sulfide/graphene quantum dot composite material
A graphene quantum dot and polyphenylene sulfide technology, which is applied to the preparation of polyphenylene sulfide composite materials and the preparation field of polyphenylene sulfide/graphene quantum dot composite materials, can solve problems such as not being widely used, and achieve application Wide range, increased Na+ concentration, effect of large heat resistance
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Embodiment 1
[0021] (1) Preparation of anhydrous sodium sulfide: Weigh 79.5 g of sodium sulfide nonahydrate, add it to 180 mL of N-dimethylpyrrolidone, and continuously pass nitrogen gas under oxygen barrier protection (nitrogen flow rate is kept at 10 mL / min). React at 150~160°C for 1 hour to obtain a green anhydrous sodium sulfide solution, which is poured into a high-temperature and high-pressure reaction kettle after cooling down;
[0022] (2) Preparation of lamellar polyphenylene sulfide: Take 6.225 g of anhydrous lithium chloride, add it to a high-temperature and high-pressure reactor, and mix it with anhydrous sodium sulfide solution; while stirring (stirring speed is 40 r / min) Add sodium hydroxide at low temperature to adjust the solution to alkaline (pH=13~14), heat up to 70°C, add 44.1 g of p-dichlorobenzene under stirring to obtain a dark green solution; after sealing the reaction kettle, stir (stirring speed is 900 r / min) to replace the air in the reactor by continuously blowin...
Embodiment 2
[0026] (1) Preparation of anhydrous sodium sulfide: same as Example 1;
[0027] (2) Preparation of lamellar polyphenylene sulfide: same as Example 1;
[0028] (3) Preparation of graphene quantum dots: same as Example 1;
[0029] (4) Preparation of polyphenylene sulfide / graphene quantum dot composite material: 1 g of lamellar polyphenylene sulfide obtained in step (3), 0.1 g of graphene quantum dots obtained in step (3), added to (3) In the filtrate of the step, stir and react at 200~220 °C for 3.5~4 h, then raise the temperature to 270~275 °C and stir for 1.5~2 h to obtain a gray precipitate; The mixed solution was washed repeatedly and dried at 60° C. to obtain the polyphenylene sulfide / graphene quantum dot composite material. Compared with pure polyphenylene sulfide, the heat resistance of the composite material is improved by 15 ℃, and the percentage of thermal weight loss is also lower than that of pure polyphenylene sulfide.
Embodiment 3
[0031] (1) Preparation of anhydrous sodium sulfide: same as Example 1;
[0032] (2) Preparation of lamellar polyphenylene sulfide: same as Example 1;
[0033] (3) Preparation of graphene quantum dots: same as Example 1;
[0034] (4) Preparation of polyphenylene sulfide / graphene quantum dot composite material: take 1 g of the lamellar polyphenylene sulfide obtained in step (2), and 0.08 g of graphene quantum dots obtained in step (3), add them to (3 ) step, first stirred and reacted at 200~220 °C for 3.5~4 h, then raised the temperature to 270~275 °C and stirred for 1.5~2 h to obtain a gray precipitate; The mixed solution of ethanol was washed repeatedly, and dried at 60°C to obtain the polyphenylene sulfide / graphene quantum dot composite material. Compared with pure polyphenylene sulfide, the heat resistance of the composite material is improved by 40 ℃, and the percentage of thermal weight loss is also lower than that of pure polyphenylene sulfide.
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