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Precursor polymer microsphere and preparation method thereof

A precursor and polymer technology, which is applied in the field of precursor polymer microspheres and its preparation, can solve the problems of difficult control of coating quality, inability to produce boron carbide ceramic microspheres with high efficiency and high quality, and achieve boron source saving, Mild conditions, good dispersion effect

Inactive Publication Date: 2017-03-29
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method has high requirements on experimental equipment and extremely strict requirements on the control of experimental conditions, and the quality of the obtained coating is difficult to control, so it has great limitations and cannot produce boron carbide ceramic microspheres efficiently and with high quality.
[0004] The precursor conversion technology fundamentally solves this problem. This method combines the advantages of molecular designability, good manufacturability, low preparation temperature and net shape, and can obtain advanced ceramic materials that are difficult to prepare by traditional techniques. Compared with the traditional coating method, the performance of ceramics can be improved by controlling the chemical composition of monomers, and the good processability of polymers can be fully utilized, which fundamentally improves the molding difficulty of boron carbide ceramics and is expected to achieve monodisperse carbonization. The controllable preparation of boron microspheres, but there is no public report on how to prepare the precursor polymer microspheres required for boron carbide ceramic microspheres

Method used

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  • Precursor polymer microsphere and preparation method thereof
  • Precursor polymer microsphere and preparation method thereof
  • Precursor polymer microsphere and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] a. Dissolving poly(6-norbornenyldecaborane-co-decaborane) in fluorobenzene, the weight average molecular weight of the precursor polymer ( M w ) is 68000, and the mass percentage of the solution is 30%. Configuration mass percentage is the polyvinyl alcohol aqueous solution of 2% as external phase;

[0031] b. Use three microsyringe pumps to press deionized water, polycarborane precursor solution and polyvinyl alcohol aqueous solution into the innermost phase, intermediate phase and outer phase of the microchannel template respectively, so that the three phases form water / oil / water ( W1 / O / W2) double emulsion system;

[0032] c. Collect the emulsion in a rotary bottle equipped with an external water phase, and place it in an emulsion rotary curing device, and the curing temperature is 30 o C, rotate clockwise around the horizontal axis at 25 rpm, and cure for 24 h;

[0033] d. Pour the liquid in the spinner bottle into a sieve to remove the outer water phase, wash it...

Embodiment 2

[0035] a. Dissolving poly(6-norbornenyldecaborane-co-1,5 hexadiene) in benzene, the weight average molecular weight of the precursor polymer ( M w ) is 5200, and the mass percentage of the solution is 20%. Configuration mass percentage is the polyvinyl alcohol aqueous solution of 2% as external phase;

[0036] b. Use three microsyringe pumps to press deionized water, polycarborane precursor solution and polyvinyl alcohol aqueous solution into the innermost phase, intermediate phase and outer phase of the microchannel template respectively, so that the three phases form water / oil / water ( W1 / O / W2) double emulsion system;

[0037] c. Collect the emulsion in a rotary bottle equipped with an external water phase, and place it in an emulsion rotary curing device, and the curing temperature is 20 o C, rotate clockwise around the horizontal axis at 25 rpm, and cure for 48 h;

[0038] d. Pour the liquid in the spinner bottle into a sieve to remove the outer water phase, wash it sev...

Embodiment 3

[0040] a. Poly(6-norbornenyldecaborane-co-norbornene), benzene and 1,2-dichloroethane are configured in the oil phase at a mass fraction of 10: 45: 45, and the weight of the precursor polymer is average molecular weight ( M w ) is 15000, and the mass percentage of the solution is 10%. And configuration mass percentage is the polyvinyl alcohol aqueous solution of 4% as external phase;

[0041] b. Use three microsyringe pumps to press deionized water, polycarborane precursor solution and polyvinyl alcohol aqueous solution into the innermost phase, intermediate phase and outer phase of the microchannel template respectively, so that the three phases form water / oil / water ( W1 / O / W2) double emulsion system;

[0042] c. Collect the emulsion in a rotary bottle equipped with an external water phase, and place it in an emulsion rotary curing device, and the curing temperature is 10 o C, rotate clockwise around the horizontal axis at 25 rpm, and cure for 72 h;

[0043]d. Pour the li...

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Abstract

The invention provides a precursor polymer microsphere and a preparation method thereof. A poly-carbon borane precursor is used as a sphere shell of the precursor polymer microsphere. The preparation method for the precursor polymer microsphere comprises the following steps: by adopting an emulsion micro-packaging technique based on a precursor conversion method, taking a poly-carbon borane precursor liquid as a middle phase and utilizing a cladding function of an oil water interface to acquire precursor polymer emulsion particles, washing, curing and drying, thereby acquiring the precursor polymer microsphere. The precursor polymer microsphere and the preparation method thereof provided by the invention have the advantages of simple process, mild conditions, excellent dispersity, high microsphere yield and rate of finished products, capability of saving boron sources, capability of reducing production cost and capability of achieving the functions of saving energy, reducing consumption and protecting environment. The precursor polymer microsphere provided by the invention can be used as a precursor material for preparing a boron carbide ceramic microsphere and also can be used in the fields of ultra-hard coatings, radiation-proof materials, laser inertial confinement fusion physical tests, and the like.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a precursor polymer microsphere and a preparation method thereof. Background technique [0002] Boron carbide has a series of compelling advantages such as high temperature resistance, oxidation resistance, high strength and low density. It has important potential applications in military defense, nuclear industry, aerospace and other fields. It can be used as high temperature structural materials, functional materials, Neutron absorbing materials, and alternative materials for ICF targets. It is worth noting that boron carbide ceramic microspheres can not only be used for ICF targets, but due to the unique physical and chemical properties of microspheres, such as high specific surface area, excellent monodispersity, controllable porosity and permeability, coupling The excellent thermomechanical properties, chemical stability and excellent neutron absorp...

Claims

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Application Information

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IPC IPC(8): C08G79/08C08J3/12C08J9/28C04B35/563C08L85/04
CPCC08G79/08C04B35/563C08J3/12C08J9/28C08J2385/04
Inventor 李婧李波李洁刘一杨刘梅芳陈素芬张占文史瑞廷初巧妹
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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