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Carbon nano tube (CNT)/ polylactic acid (PLA) composite material and preparation method thereof

A technology of carbon nanotubes and composite materials, which is applied in the preparation of plasticizer-assisted dispersion of carbon nanotubes, and in the field of carbon nanotube/polylactic acid composite materials, can solve the problems of long operation process and complicated CNT process, and achieve high performance improvement. Effect

Inactive Publication Date: 2011-11-02
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is commonly used to functionalize CNTs and then prepare them into polymer composite materials. The process of functionalizing CNTs is more complicated and the operation process is longer.

Method used

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  • Carbon nano tube (CNT)/ polylactic acid (PLA) composite material and preparation method thereof
  • Carbon nano tube (CNT)/ polylactic acid (PLA) composite material and preparation method thereof
  • Carbon nano tube (CNT)/ polylactic acid (PLA) composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The weights of polylactic acid, polyethylene glycol, and carbon nanotubes are 63g, 7g, and 2.1g, respectively. After weighing, the three materials were directly poured into the internal mixer for internal mixing, and the composite material was prepared by a general melt blending process, the process temperature was set at 190°C, and the time was 8 minutes. Before use, treat the carbon nanotubes, put the carbon nanotubes into KMnO 4 、H 2 SO 4 and H 3 PO 4 mixed acid solution, where KMnO 4 Mass ratio 0.3%, H 2 SO 4 and H 3 PO 4 The volume ratio is 2:1, ultrasonic for 40min, and then washed repeatedly in distilled water to remove acid and impurities.

Embodiment 2

[0021] Example 2: The weights of polylactic acid, polyethylene glycol, and carbon nanotubes are 66g, 4g, and 1.05g, respectively. After weighing, the three materials were directly poured into the internal mixer for internal mixing, and the composite material was prepared by a general melt blending process, the process temperature was set at 190°C, and the time was 8 minutes. The treatment of carbon nanotubes is as in Example 1.

Embodiment 3

[0022] Embodiment 3: The weights of polylactic acid, polyethylene glycol, and carbon nanotubes are 56g, 14g, and 3.5g, respectively. After weighing, the three materials were directly poured into the internal mixer for internal mixing, and the composite material was prepared by a general melt blending process. The process temperature was set at 180°C and the time was 8 minutes. The treatment of carbon nanotubes is as in Example 1.

[0023] The composite material is composed of carbon nanotubes, polyethylene glycol and polylactic acid, wherein the weight of polyethylene glycol is 5%-20% of the total weight, and the weight of carbon nanotubes is 1.5% of the total weight of polyethylene glycol and polylactic acid —5%, the remainder is polylactic acid.

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Abstract

The invention belongs to the technical field of macromolecular polymer based composite materials, particularly relates to a carbon nano tube (CNT) / polylactic acid (PLA) composite material and a preparation method thereof. The method is characterized in that a plasticizer is added in the traditional melt blending process, therefore, the affinity of carbon nano tubes with a PLA matrix can be improved and a CNT percolation network can be formed in the PLA. The preparation process is very simple and the preparation cost is lower. The molecular motion of the PLA is limited to a certain extent by the formation of the percolation network, therefore, the composite material shows an approximately solid elastic behavior; and the carbon nano tubes can disperse in the PLA matrix very well, therefore, a solid foundation is laid for improving the properties of the PLA.

Description

technical field [0001] The invention belongs to the technical field of polymer-based composite materials, and in particular relates to a preparation method for plasticizer-assisted dispersion of carbon nanotubes and a carbon nanotube / polylactic acid composite material. Background technique [0002] As an excellent filler, carbon nanotubes (CNTs) can endow polymer composites with good mechanical, electrical and thermal properties. The CNT percolation network formed by carbon nanotubes in the polymer matrix can significantly improve the electrical conductivity and non-terminal rheological behavior of the composite. The formation of CNT percolation network mainly depends on the dispersion of CNT morphology. Therefore, achieving proper dispersion of inorganic CNTs in the polymer matrix is ​​a key factor to ensure a low percolation threshold and high mechanical strength. [0003] However, due to the intrinsic incompatibility of CNTs and the polymer matrix, large agglomerations ...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L71/08C08K9/02C08K7/00C08K3/04
Inventor 那兵吕瑞华罗明标邹淑芬潘华燕
Owner EAST CHINA UNIV OF TECH
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