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Chain-extended hydroxyl terminated polybutadiene-polystyrene block copolymer/carbon nanotube conductive composite material and preparation method and application thereof

A technology of chain-extended hydroxyl-terminated polybutadiene and hydroxyl-terminated polybutadiene, which is applied in the field of conductive polymer composite materials and functional materials, and can solve problems such as difficult film formation, poor sensor response performance, and unstable electrical conductivity. , to achieve the effect of fast response, good stability and good dispersion stability

Active Publication Date: 2019-03-29
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of polystyrene (copolymer)-based conductive polymer composite material that is difficult to form a film, thus unstable conductivity and poor sensory response performance, and provide a chain extension device with good conductivity and response characteristics. Hydroxyl-terminated polybutadiene-polystyrene block copolymer / carbon nanotube conductive composite material and its preparation method, and the composite material is used for the detection of volatile organic compound dichloromethane vapor

Method used

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  • Chain-extended hydroxyl terminated polybutadiene-polystyrene block copolymer/carbon nanotube conductive composite material and preparation method and application thereof
  • Chain-extended hydroxyl terminated polybutadiene-polystyrene block copolymer/carbon nanotube conductive composite material and preparation method and application thereof
  • Chain-extended hydroxyl terminated polybutadiene-polystyrene block copolymer/carbon nanotube conductive composite material and preparation method and application thereof

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Experimental program
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Embodiment 1

[0035]

[0036] 1. Preparation of chain-extended hydroxyl polybutadiene macroinitiators

[0037] Dissolve 2 g (hydroxyl content 2.20 mmol) of hydroxyl-terminated polybutadiene (HTPB) represented by formula I in 12 mL of dry toluene and add it to a round bottom flask, then add 0.0925 g (0.55 mmol) hexamethylene diisocyanate (HDI, isocyanate group content 1.10mmol) and 12mg (0.019mmol) dibutyltin dilaurate (DBTDL), reacted at 60°C for 2 hours under a nitrogen atmosphere, and dried the product under vacuum at 40°C for 12 hours to obtain formula II- The chain-extended hydroxyl-terminated polybutadiene (HTPB) shown in 1 5 , molecular weight is 11880).

[0038] Dissolve 23.76g (2mmol) of chain-extended hydroxyl-terminated polybutadiene and 0.5252g (5.2mmol) of triethylamine (TEA) in 30mL of dry toluene and add them to a round-bottomed flask, cool to 0°C, and Add 1.195 g (5.2 mmol) of dibromoisobutyryl bromide (BIB) dissolved in 10 mL of dry toluene dropwise, stir in an ice bath...

Embodiment 2

[0043] In step 2 of this embodiment, the amount of multi-walled carbon nanotubes is 0.2376g, and other steps are the same as in embodiment 1 to obtain a chain-extended hydroxyl polybutadiene-polystyrene block copolymer / carbon nanotube conductive composite Materials (MWCNTs@PS 74 -b-HTPB 5 -b-PS 74 ).

Embodiment 3

[0045] In step 2 of this embodiment, the amount of multi-walled carbon nanotubes is 0.6449g, and other steps are the same as in embodiment 1 to obtain a chain-extended hydroxyl polybutadiene-polystyrene block copolymer / carbon nanotube conductive composite Materials (MWCNTs@PS 74 -b-HTPB 5 -b-PS 74 ).

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Abstract

The invention discloses a chain-extended hydroxyl terminated polybutadiene-polystyrene block copolymer / carbon nanotube conductive composite material and a preparation method and an application thereof. The composite material is characterized in that the surface of the multi-walled carbon nanotube is coated with the chain-extended hydroxyl terminated polybutadiene-polystyrene block copolymer; the block copolymer is subjected to a polyaddition reaction thorugh hexamethylene diisocyanate and hydroxyl terminated polybutadiene for chain extension, the chain-extended polymer is further prepared intoa macro initiator by an acylation reaction, and finally styrene polymerization is initiated by in-situ atom transfer radical polymerization in the presence of the multi-walled carbon nanotube. The conductive composite material of the invention has good dispersion stability and film forming property, and a gas-sensitive sensing film assembled by the conductive composite material has high selectivity, response sensitivity and good stability, and repeatability to a dichloromethane organic solvent vapor.

Description

technical field [0001] The invention belongs to the technical field of conductive polymer composite materials and functional materials, and in particular relates to a chain-extended hydroxyl polybutadiene-polystyrene block copolymer / carbon nanotube conductive composite material and a preparation method of the conductive composite material and gas sensing applications. Background technique [0002] As more and more volatile organic gases appear in the human living environment, humans urgently need a mini-monitor to evaluate the impact of organic vapors on the environment. Due to the unique physical and chemical properties of conductive polymer composites (CPCs), they have attracted extensive attention in the field of environmental gas monitoring. Conductive polymer composites are usually prepared by dispersing conductive fillers such as carbon black (CB), carbon nanotubes (CNTs), graphene, and metal powders in an insulating polymer matrix to form a conductive network. In pa...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08F212/08C08G18/69C08G18/73C08K3/04C08J5/18G01N27/30
CPCC08F212/08C08F293/005C08F2438/01C08G18/69C08G18/73C08J5/18C08J2353/02C08K2201/011C08K3/041G01N27/30
Inventor 罗延龄张瑞乾徐峰陈亚芍
Owner SHAANXI NORMAL UNIV
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