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Self-repairing MXene/polyurethane thermoelectric composite material and preparation method thereof

A composite material, polyurethane technology, applied in the field of self-healing MXene/polyurethane thermoelectric composite material and its preparation, can solve the problems of lack of self-healing function, overall failure of thermoelectric conversion, damage to three-dimensional conductive network, etc., and achieve unique lightweight porous Three-dimensional network structure, excellent modification effect, rich source effect

Inactive Publication Date: 2020-01-21
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, the thermoelectric composite materials in the prior art have their inherent disadvantages, that is, they do not have the function of self-healing, and when subjected to external stress during use, conventional thermoelectric composite materials are prone to microcracks
Once micro-cracks are formed on the surface or inside, the micro-cracks will slowly expand under the action of stress, destroying the three-dimensional conductive network of the thermoelectric composite material, rapidly reducing the thermoelectric performance, and eventually leading to the overall failure of thermoelectric conversion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of preparation method of self-healing type MXene / polyurethane thermoelectric composite material, comprises the steps:

[0040] (1) Pretreatment of loofah fibers: cut loofah fibers into 1cm×1cm×1cm block cylinders, put them into a beaker, add 1L of prepared 0.05mol / L NaOH solution in the beaker, and put them under 50°C After standing for 50 hours, wash with deionized water to neutrality, and dry; put the loofah of alkali treatment into another beaker, add 0.05mol / L bromic peroxodisulfuric acid solution of 1L prepared in the beaker, Place at 30°C for 10 hours, then wash with deionized water until neutral, and dry to obtain pretreated loofah fiber, which is ready for use;

[0041] (2) Preparation of MXene-modified loofah fiber: add 20mL of DMF and 0.05g of MXene to a dry beaker, disperse for 10min under the action of ultrasound with a power of 600W and a frequency of 18000HZ, and then ball mill at a speed of 2000rpm in a ball mill 2h, rotate forward and reverse alt...

Embodiment 2

[0057] A kind of preparation method of self-healing type MXene / polyurethane thermoelectric composite material, comprises the steps:

[0058] (1) Pretreatment of loofah fibers: cut loofah fibers into 1cm×0.5cm×0.5cm block cylinders, put them into a beaker, add 1L of 5mol / L KOH solution prepared in the beaker, and heat at 20°C After standing for 0.5h, wash with deionized water until neutral, and dry; put the alkali-treated loofah into another beaker, add 1L of 0.03mol / L sodium hypochlorite solution prepared in the beaker, and heat it at 25°C Put it down for 7h, then wash it to neutral with deionized water, and dry it to obtain the pretreated loofah fiber, which is ready for use;

[0059] (2) Preparation of MXene-modified loofah fiber: Add 50mL of NMP and 0.1g of MXene to a dry beaker, disperse for 5min under the action of ultrasound with a power of 1800W and a frequency of 22000HZ, and then ball mill at a speed of 4000rpm in a ball mill 1h, the abrasive is agate beads, the diam...

Embodiment 3

[0074] A kind of preparation method of self-healing type MXene / polyurethane thermoelectric composite material, comprises the steps:

[0075] (1) Pretreatment of the loofah fiber: the loofah fiber is crushed into short fibers of 0.1 to 0.5 mm in length, put into a beaker, and 1 L of prepared 0.5 mol / L Ca(OH) is added in the beaker 2 solution, placed at 30°C for 5 hours, then washed with deionized water until neutral, and dried; put the alkali-treated loofah into another beaker, and added 1L of 0.01mol / L peroxygen to the beaker Acetic acid solution, placed at 25 ° C for 6 hours, then washed with deionized water until neutral, dried to obtain pretreated loofah fibers, ready to use;

[0076] (2) Preparation of MXene-modified loofah fiber: Add 100mL of DMSO and 0.5g of MXene to a dry beaker, disperse for 40min under the action of ultrasound with a power of 2500W and a frequency of 20000HZ, and then ball mill at a speed of 6000rpm in a ball mill 4h, rotate forward and reverse alter...

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Abstract

The invention relates to a self-repairing MXene / polyurethane thermoelectric composite material and a preparation method thereof. A pretreated loofah sponge fiber skeleton and MXene are hybridized to form a three-dimensional mutual lap joint network structure, the network structure and self-repairing microcapsules are implanted in the polymerization process of polyurethane, and the prepared composite material has a high seebeck coefficient, a high thermoelectric figure of merit and good mechanical properties. The self-repairing microcapsules are used as a functional material, so that automaticresponse to damage and self-repairing of a conductive network can be realized. The composite material can be applied to a conductive composite material, an elastic conductor or a thermoelectric material.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a self-healing MXene / polyurethane thermoelectric composite material and a preparation method thereof. Background technique [0002] With the acceleration of global industrialization and the rapid growth of population, energy consumption is also increasing worldwide. However, the energy on the earth is limited, and some traditional non-renewable energy sources, such as coal, oil, and natural gas, are becoming increasingly depleted. , The problem of energy shortage has become increasingly prominent, and has become a problem that cannot be ignored in every country. In order to alleviate the contradiction between economic development, energy and the environment, research and development of new renewable clean energy and new efficient energy conversion and storage technologies are imminent. At present, great progress has been made in the development and utilizatio...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08L97/02C08L61/24C08L63/02C08K7/00C08K3/14C08G18/66C08G18/64C08G18/48C08G18/12C08G18/32B01J13/14
CPCB01J13/14C08G18/12C08G18/4825C08G18/6492C08G18/6674C08G18/6677C08G18/6685C08K2201/001C08K2201/011C08L75/08C08L2201/04C08L2205/035C08L97/02C08L61/24C08L63/00C08K7/00C08K3/14C08G18/3206C08G18/3228
Inventor 董爽向萌
Owner CHANGZHOU INST OF TECH
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