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A method for polymer crystallization coating on the surface of carbon-based nanomaterials

A carbon-based nanomaterial and carbon-based nanopowder technology, which is applied in the field of non-covalent coating and modification of carbon-based nanomaterial surface polymers, can solve problems such as unfavorable large-scale application and harsh crystallization conditions, and achieve controllable product structure. , Wide application range, the effect of maintaining structural stability

Active Publication Date: 2017-12-05
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Related research has been reported in many literatures so far, but in summary, there are still the following deficiencies: (1) The modification process generally needs to be divided into two steps, first of all, it needs to be synthesized to obtain semi-crystalline polymers, such as polyethylene, nylon, polyacrylonitrile etc., and then in the solution system containing graphene (carbon nanotubes), the polymer is slowly precipitated to realize the induced crystallization on the former surface; (2) the crystallization conditions required for the induced crystallization process are relatively harsh, such as the solution precipitation crystallization process needs to be Isothermal crystallization at a specific temperature for a long time
The above characteristics are not conducive to the large-scale application of this technology

Method used

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  • A method for polymer crystallization coating on the surface of carbon-based nanomaterials
  • A method for polymer crystallization coating on the surface of carbon-based nanomaterials
  • A method for polymer crystallization coating on the surface of carbon-based nanomaterials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1, comparative example 1

[0045] 1. Sample preparation

[0046] (1) Embodiment 1

[0047] Step 1: Under nitrogen protection, 150mg (feeding concentration: 5mg / mL) multi-armed carbon nanotubes (MWCNTs, product of Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, with a purity of 95%, an average outer diameter of about 30nm, an average inner diameter of about 10nm, and an average Length 30~50μm, specific surface area 233m 2 / g) and 24mL of anhydrous dichloromethane were added into a 50mL Schlenk reaction bottle, and the initial dispersion of MWCNTs was obtained by ultrasound (power 75W, time 2h) at room temperature; Bulk cyclopentene (4.76g, feeding concentration is 4.67×10 －4 mol / mg MWCNTs) and 50mg Pd-diimine catalyst 3 (feeding concentration is 3.2×10 -4 mmol / mg MWCNTs), then at a constant temperature (25°C) and magnetic stirring speed (200rpm), the reaction was continued for 8h to obtain a reaction product.

[0048] Step 2: centrifu...

Embodiment 2

[0055] Embodiment 2, comparative example 2

[0056] 1. Sample preparation

[0057] (1) Example 2

[0058] Step 1: Under nitrogen protection, 150mg (feeding concentration: 5mg / mL) multi-armed carbon nanotubes (MWCNTs, product of Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, with a purity of 95%, an average outer diameter of about 30nm, an average inner diameter of about 10nm, and an average Length 30~50μm, specific surface area 233m 2 / g) and 24mL of anhydrous dichloromethane were added into a 50mL Schlenk reaction bottle, and the initial dispersion of MWCNTs was obtained by ultrasound (power 75W, time 2h) at room temperature; Bulk cyclopentene (4.76g, feeding concentration is 4.67×10 －4 mol / mg MWCNTs) and 100mg Pd-diimine catalyst 3 (feeding concentration is 6.4×10 -4 mmol / mg MWCNTs), then at a constant temperature (25° C.) and magnetic stirring speed (200 rpm), the reaction was continued for 4 h to obtain a reaction product.

[0059] Step 2: centri...

Embodiment 3

[0069] Embodiment 3, comparative example 3

[0070] 1. Sample preparation

[0071] (1) Example 3

[0072] Step 1: Under nitrogen protection, 150mg (feeding concentration: 5mg / mL) multi-armed carbon nanotubes (MWCNTs, product of Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, with a purity of 95%, an average outer diameter of about 30nm, an average inner diameter of about 10nm, and an average Length 30~50μm, specific surface area 233m 2 / g) and 24mL of anhydrous dichloromethane were added into a 50mL Schlenk reaction bottle, and the initial dispersion of MWCNTs was obtained by ultrasound (power 75W, time 2h) at room temperature; Bulk cyclopentene (4.76g, feeding concentration is 4.67×10 －4 mol / mg MWCNTs) and 75mg Pd-diimine catalyst 3 (feeding concentration is 4.8×10 -4 mmol / mg MWCNTs), then at a constant temperature (25°C) and magnetic stirring speed (200rpm), the reaction was continued for 8h to obtain a reaction product.

[0073] Step 2: Centrifuge (...

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Abstract

A method for polymer-induced crystallization coating on the surface of carbon-based nanomaterials, comprising the following steps: (1) adding carbon-based nano-powder and an organic solvent into a reaction vessel, and obtaining a dispersion liquid by ultrasonic at 5-35°C; Add polymerization monomers and α-diimine palladium catalysts, and then continue to react for a certain period of time by stirring or ultrasonic field at 5 to 40°C to obtain reaction products; the polymerization monomers are alicyclic olefins; (2 ) Centrifuge or vacuum filter the reaction product obtained in step (1) to remove excess polymerized monomers and α-diimine palladium catalyst residues, and obtain carbon-based nanopowder coated with surface polymer crystals after drying . In the method of the invention, the in-situ synthesis of the semi-crystalline polymer and the process of inducing crystallization on the surface of the carbon-based nanomaterial are simultaneously completed, and has the advantages of mild conditions, simple process, wide application range, and the like.

Description

technical field [0001] The invention relates to a method for non-covalent coating modification of surface polymers of carbon-based nanomaterials. Background technique [0002] Carbon-based nanomaterials (including C60, carbon nanotubes, and graphene, corresponding to 0-, 1-, and 2-dimensional structures, respectively), all composed of sp 2 The composition of hybrid carbon atoms has been a hot topic in the field of nanomaterials research in recent years. Due to their unique one-dimensional and two-dimensional structures, carbon nanotubes and graphene exhibit excellent electrical and thermal conductivity, mechanical and optical properties, and have broad applications in the fields of energy conversion and storage, advanced composite materials, and optoelectronic devices. Application prospect. [0003] However, in order to realize the application of carbon nanotubes and graphene in the above-mentioned fields, the following problems must be solved first: first, realize the hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/10C08K7/24C08K3/04C08F132/04C08F4/80
Inventor 钟明强徐立新孟竺
Owner ZHEJIANG UNIV OF TECH
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