Surface covalent grafting modified hexagonal boron nitride nano-sheets and preparation method thereof

A technology of hexagonal boron nitride and graft modification, which is applied in the field of surface covalent graft modification of hexagonal boron nitride nanosheets and its preparation, can solve the problem that the coupling agent and the polymer matrix are not easy to form chemical bonds, and BNNSs cannot Long-term and stable existence and other problems, to achieve the effect of low cost, improved compatibility and interfacial interaction, and mild conditions

Inactive Publication Date: 2020-02-28
CHANGSHU INSTITUTE OF TECHNOLOGY
View PDF7 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, coupling agents are mostly used in the surface modification of BNNSs. However, BNNSs modified by coupling agents cannot exist in the polymer matrix stably for a long

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Surface covalent grafting modified hexagonal boron nitride nano-sheets and preparation method thereof
  • Surface covalent grafting modified hexagonal boron nitride nano-sheets and preparation method thereof
  • Surface covalent grafting modified hexagonal boron nitride nano-sheets and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1

[0041] Disperse 1 g of h-BN powder in 300 ml of deionized water and keep stirring, then add 60 g of sodium hydroxide and continue stirring to obtain a mixed solution. The mixture was placed in an ultrasonic breaker, and ultrasonically peeled for 15 hours under the conditions of 80 kHz and 300 W. After ultrasonic treatment, the dispersion was centrifuged at a centrifugal speed of 3000 rpm for 30 min to remove unstripped h-BN. The supernatant was filtered and washed with deionized water until the pH of the filtrate=7. Place the filter cake at 80 o In a vacuum oven in C, 0.254 g of BNNSs-OH was obtained after drying for 8 h, with a yield of 25.4% (yield = mass of BNNSs-OH / mass of original h-BN).

[0042] figure 1The transmission electron microscope image of the BNNSs-OH prepared for BNNSs-OH shows that it is almost transparent to the electron beam, and there are obvious wrinkles and ripples, confirming its soft and thin characteristics, indicating the succ...

Example Embodiment

[0043] Example 2

[0044] Disperse 1 g of h-BN powder in 300 ml of deionized water and keep stirring, then add 80 g of sodium hydroxide and keep stirring to obtain a mixture. The mixture was placed in an ultrasonic breaker, and ultrasonically peeled for 15 h under the conditions of 80 kHz and 300 W. After ultrasonic treatment, the dispersion was centrifuged at a centrifugal speed of 3000 rpm for 30 min to remove unstripped h-BN. The supernatant was filtered and washed with deionized water until the pH of the filtrate=7. Place the filter cake at 80 o In a vacuum oven in C, 0.338 g of BNNSs-OH was obtained after drying for 8 h, with a yield of 33.8%.

[0045] image 3 The high-resolution XPS results of B(a) and N(b) elements in the prepared BNNSs-OH show that there are B-O peaks but no N-O peaks, which means that the generated hydroxyl groups are bonded to the B atoms on the surface of BNNSs , rather than N atoms.

Example Embodiment

[0046] Example 3

[0047] Disperse 1 g of h-BN powder in 300 ml of deionized water and keep stirring, then add 100 g of potassium hydroxide and keep stirring to obtain a mixture. The mixture was placed in an ultrasonic breaker, and ultrasonically peeled for 15 h under the conditions of 80 kHz and 300 W. After ultrasonic treatment, the dispersion was centrifuged at a centrifugal speed of 3000 rpm for 30 min to remove unstripped h-BN. The supernatant was filtered and washed with deionized water until the pH of the filtrate=7. Place the filter cake at 80 o In a vacuum oven in C, 0.265 g of BNNSs-OH was obtained after drying for 8 h, with a yield of 26.5%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Grafting rateaaaaaaaaaa
Login to view more

Abstract

The invention discloses surface covalent grafting modified hexagonal boron nitride nano-sheets and a preparation method thereof. According to the preparation method, under alkali metal hydroxide assisted ultrasonic action, preparation and surface hydroxylation of boron nitride nano-sheets are achieved in one step; the boron nitride nano-sheets are subjected to covalent graft modification by adopting high-activity diisocyanate molecules; and one isocyanate group can be subjected to a hydrogen transfer reaction with the hydroxyl on the surface of the boron nitride nano-sheets, and the remainingother isocyanate group endows the boron nitride nano-sheets with high dispersity and chemical activity. According to the invention, the agglomeration problem of boron nitride nano-sheets in an organicsolvent and a resin matrix can be solved, and a covalent interface can be formed between boron nitride nano-sheets and a resin matrix, so the compatibility is improved, and large-scale production andpractical application of boron nitride nano-sheets are facilitated.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a surface covalently grafted modified hexagonal boron nitride nanosheet and a preparation method thereof. Background technique [0002] In recent years, hexagonal boron nitride (h-BN) has attracted the attention of researchers due to its excellent mechanical, thermal, electrical and other properties. Similar to graphite, h-BN is stacked by multilayer two-dimensional nanosheets, which can be further exfoliated into boron nitride nanosheets (BNNSs) by external force. BNNSs not only have thermal conductivity and mechanical properties comparable to graphene, but also have excellent properties such as wide band gap, high thermal stability, strong corrosion resistance, small dielectric constant, low density, and low thermal expansion coefficient. These excellent properties make BNNSs stand out among many thermally conductive and insulating fillers, and become the most idea...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C09C1/00C09C3/08
CPCC09C1/00C09C3/08
Inventor 袁凤秦余杨卞元彪曹振兴王玉丰蔡达威郑玉斌
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products