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Polystyrene-vinylbenzyl dimethyl dodecyl ammonium chloride-barium titanate composite material and preparation method

A technology of vinylbenzyldimethyldodecyl ammonium chloride and polystyrene, which is applied in the field of composite materials, can solve the problems of strong surface action, cumbersome steps, large surface energy, etc., and achieves uniform and stable dispersion state , to solve the effect of severe reunion

Inactive Publication Date: 2020-12-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small particle size, large specific surface area, large surface energy and strong surface interaction of nanoparticles, they are easy to agglomerate and have poor dispersion.
Most of the surface modification methods of nanoparticles reported so far are complex in operation and cumbersome in steps, which brings inconvenience to the preparation of polymer-based nanocomposites.

Method used

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  • Polystyrene-vinylbenzyl dimethyl dodecyl ammonium chloride-barium titanate composite material and preparation method
  • Polystyrene-vinylbenzyl dimethyl dodecyl ammonium chloride-barium titanate composite material and preparation method
  • Polystyrene-vinylbenzyl dimethyl dodecyl ammonium chloride-barium titanate composite material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0047] (1) Weigh 0.4g VDAC, 0.057g initiator KPS, dissolve them in 50mL deionized water, then weigh 10g monomer styrene, add them into a 250mL four-neck flask, stir and pre-emulsify at 700rpm for 2h, and obtain the pre-emulsified Emulsion, the pre-emulsion is added to the constant pressure dropping funnel for use;

[0048] (2) 0.5g BaTiO 3 Nanoparticles and 0.6g cationic monomer VDAC were dispersed in 50mL deionized water, and ultrasonically dispersed with a JY92-II N-type ultrasonic cell pulverizer. The set parameters were: power 600W, working time 3s, intermittent time 2s, ultrasonic in an ice bath environment 30min, obtain the ultrasonic dispersion liquid and join in the 250mL four-neck flask;

[0049] (3) Add 10g of styrene to the ultrasonic dispersion in a 250mL four-neck flask, emulsify in a water bath at room temperature for 0.5h, set the stirring speed at 700rpm, and start to heat up after 0.5h; when the temperature reaches 70°C, weigh 0.057g KPS, dissolved in a smal...

Embodiment 2

[0052] (2) Preparation of polystyrene-barium titanate nanocomposite emulsion with cationic monomer VDAC as emulsifier: Weigh 0.5g VDAC, 0.057g initiator KPS, dissolve in 50mL deionized water, and then weigh 10g monomer styrene , added to a 250mL four-necked flask, stirred at 700rpm for pre-emulsification for 2h, and added the pre-emulsion to a constant pressure dropping funnel for use; then 0.5g BaTiO 3 Nanoparticles and 0.5g cationic monomer VDAC were dispersed in 50mL deionized water, and ultrasonically dispersed with a JY92-II N-type ultrasonic cell pulverizer. The set parameters were: power 600W, working time 3s, intermittent time 2s, ultrasonic in an ice bath environment After 30 minutes, add the ultrasonic dispersion liquid into a 250mL four-necked flask; then weigh 10g of styrene, add it to a 250mL four-necked flask, pre-emulsify in a water bath at room temperature for 0.5h, set the stirring speed to 700rpm, and start to heat up after 0.5h; reach 70°C, weigh 0.057g KPS,...

Embodiment 3

[0054] (2) Preparation of polystyrene-barium titanate nanocomposite emulsion with cationic monomer VDAC as emulsifier: Weigh 0.6g VDAC, 0.057g initiator KPS, dissolve in 50mL deionized water, and then weigh 10g monomer styrene , added to a 250mL four-necked flask, stirred at 700rpm for pre-emulsification for 2h, and added the pre-emulsion to a constant pressure dropping funnel for use; then 0.5g BaTiO 3 Nanoparticles and 0.4g cationic monomer VDAC were dispersed in 50mL deionized water, and ultrasonically dispersed with a JY92-II N-type ultrasonic cell pulverizer. The set parameters were: power 600W, working time 3s, intermittent time 2s, ultrasonic in an ice bath environment After 30 minutes, add the ultrasonic dispersion liquid into a 250mL four-necked flask; then weigh 10g of styrene, add it to a 250mL four-necked flask, pre-emulsify in a water bath at room temperature for 0.5h, set the stirring speed to 700rpm, and start to heat up after 0.5h; reach 70°C, weigh 0.057g KPS,...

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Abstract

The invention discloses a polystyrene-vinyl benzyl dimethyl dodecyl ammonium chloride-barium titanate composite material and a preparation method thereof. The preparation method comprises the following steps: step 1, taking styrene (St) and vinyl benzyl dimethyl dodecyl ammonium chloride (VDAC) as comonomers, adding an initiator to prepare a pre-emulsion, wherein the initiator and water form a water phase, and the VDAC and the St serve as an oil phase; step 2, taking VDAC as a dispersing agent, pre-dispersing nano BaTiO3 in a water solution to obtain a BaTiO3 nano ion dispersion liquid, and then adding St and an initiator to form an emulsion polymerization system, wherein the initiator, the nano BaTiO3 and water form a water phase, and the VDAC and the St serve as an oil phase; and step 3,heating the emulsion polymerization system to an initiation temperature, dropwise adding the pre-emulsion into the emulsion polymerization system, and carrying out stirring for emulsion polymerization, so as to obtain the P(St-co-VDAC) / BaTiO3 copolymer emulsion. In the copolymer emulsion and copolymer microsphere powder, the nano barium titanate is dispersed in a nano grade, the dispersion stateis uniform and stable, and a problem of serious agglomeration of nano particles in a polystyrene-barium titanate composite material is solved.

Description

technical field [0001] The invention belongs to the field of composite materials, and more specifically, relates to a polystyrene (PS) composite material, especially taking PS as a matrix, through cationic monomer vinyl benzyl dimethyl dodecyl ammonium chloride (PS) VDAC) and nano barium titanate (BaTiO 3 ) to generate electrostatic interaction and steric hindrance interaction to promote the dispersion of nanobarium titanate and prepare PS-based nanocomposites. Background technique [0002] The polymer-based nanocomposite refers to a composite material that uses a polymer as a matrix, and the size of the dispersed phase is less than 100 nm in at least one dimension. Polymer-based nanocomposites combine the advantages of polymers and nanomaterials, realize the optimization and complementarity in performance, and have broad research and application prospects. However, due to the small particle size, large specific surface area, large surface energy and strong surface interac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F212/14C08F2/44C08K3/24
CPCC08F2/28C08F2/44C08F212/08C08K3/24C08K2201/011C08F212/14
Inventor 郑俊萍陈雨丁永
Owner TIANJIN UNIV