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Method for preparing boron nitride nanowire by cracking of polymer

A boron nitride nanometer and polymer technology, which is applied in chemical instruments and methods, nitrogen compounds, nanotechnology, etc., can solve the problems that BN nanowires are in the blank, and it is difficult to show the quantum size effect of nanomaterials, so as to achieve easy scale The effect of convenient production and operation and cost reduction

Active Publication Date: 2011-07-20
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the diameter of BN nanofibers prepared by electrospinning is mostly about 100nm, which makes it difficult to show the quantum size effect of nanomaterials.
Research on smaller diameter (<50nm) BN nanowires is rarely reported at home and abroad
At the same time, the research on the preparation of BN nanowires by direct cracking of polymer precursors is still blank in the world.

Method used

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  • Method for preparing boron nitride nanowire by cracking of polymer

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Embodiment 1

[0019] (1) Synthesize the polyalkylaminoborazine precursor with the following structural formula according to the prior art: (for synthesis see Chinese Chem. Lett. , 21, 1079 (2010), its softening point is about 75℃,

[0020]

[0021] (2) Grind the polyalkylaminoborazine precursor in a glove box under the protection of Ar gas, and sieve it with 1000 mesh; put the sieved precursor powder in a graphite boat, and in a tube furnace, In a high-purity nitrogen atmosphere, heat up to 150°C at a heating rate of 4°C / min, with a nitrogen flow rate of 60ml / min, and keep warm for 1h; then heat up to 600°C at a heating rate of 5°C / min, and keep warm for 2h; Min heating rate, control nitrogen flow rate 50ml / min, heating to 1300°C, keep warm for 2h, to obtain BN nanowires.

[0022] The SEM pictures of its BN nanowires are as figure 1 and figure 2 shown. Its diameter is relatively uniform, about 12~18nm.

Embodiment 2

[0024] (1) Synthesis of polyalkylaminoborazine precursor, (synthesis see Chinese Chem. Lett. , 21, 1079 (2010)), its softening point is about 83℃;

[0025] (2) Grind the polyalkylaminoborazine precursor in a glove box under the protection of Ar gas, and sieve it with 1000 mesh; put the sieved precursor powder in a graphite boat, and in a tube furnace, In a high-purity nitrogen atmosphere, the temperature was raised to 150°C at a heating rate of 4°C / min, the nitrogen flow rate was 60ml / min, and the temperature was kept for 1h; Min heating rate, control nitrogen flow rate 70ml / min, heating to 1600 ℃, keep warm for 2h, to get BN nanowires with a diameter of 12~18nm.

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Abstract

The invention provides a method for preparing a boron nitride nanowire by cracking of a polymer. The method comprises the following steps: synthesizing a polyalkylamino borazine precursor according to the prior art: grinding the precursor under the protective condition of inert gas and screening the grinded precursor through a 1000-mesh sieve; placing the precursor powder in a graphite boat, rising the temperature to 100-200 DEG C at the speed of 3-10 DEG C / min in the presence of high-pure nitrogen in a tubular furnace, and then insulating for 1-3 hours; rising the temperature to 500-700 DEG C at the speed of 3-10 DEG / min, and then insulating for 1-3 hours; at the atmosphere of nitrogen, heating to 1000-1600 DEG C at the rising speed of 3-10 DEG C / min, then insulating for 0.5-5 hours, and then cooling along with the furnace so as to obtain the boron nitride nanowire. The diameter of the nanowire prepared by the method is about 13-18 nm and is evenly distributed, no catalyst is used, preparation temperature is low, and energy is saved, thereby reducing the cost; and the method is simple in process, is convenient for operation and is easy to achieve large scale; and as a structure reinforced material, a semiconductor material, a wave-transparent material and the like, the prepared boron nitride nanowire has a good prospect of application.

Description

technical field [0001] The invention relates to the field of boron nitride material preparation; specifically, it relates to a method for preparing boron nitride nanowires by cracking polymers. Background technique [0002] Boron nitride ceramic materials have very broad application prospects in many fields such as metallurgy, machinery, electronics and aerospace. Nanostructured BN, such as nanowires, nanotubes, nanoparticles, etc., is more suitable for applications in high temperature, oxidizing and corrosive environments due to its large specific surface area, chemical reactivity and special optical properties. At present, the commonly used methods for preparing BN nanomaterials (nanofibers, nanotubes, and nanorods) include template method and electrospinning method. Such as Beachelany et al. using the template method (see J. Phys. Chem. C , 111, 13378 (2007)) prepared BN nanotubes with a diameter of about 200nm. Miele et al. used polymer precursors combined with electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064B82Y40/00
CPCY02P20/10
Inventor 王应德雷永鹏
Owner NAT UNIV OF DEFENSE TECH
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