Polyimide/carbon nano-tube X-ray window thin film and preparation method thereof

A technology of carbon nanotubes and window films, which is applied in the field of material testing of X-ray applications, can solve problems such as difficult processing, poisonous beryllium windows, and use, and achieve the effects of simple processing methods, improved mechanical properties, and high transmittance

Active Publication Date: 2014-01-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the beryllium window prepared by the prior art cannot be used in the bare air due to its toxicity, and the processing is difficult, and to provide a polyimide / carbon nanotube X-ray window film and its preparation method

Method used

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  • Polyimide/carbon nano-tube X-ray window thin film and preparation method thereof
  • Polyimide/carbon nano-tube X-ray window thin film and preparation method thereof
  • Polyimide/carbon nano-tube X-ray window thin film and preparation method thereof

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specific Embodiment approach 1

[0012] Specific embodiment 1: This embodiment is a polyimide / carbon nanotube X-ray window film, which is prepared from modified carbon nanotubes, diamine monomers, dianhydride monomers and organic solvents. The mass ratio of modified carbon nanotube and diamine monomer is 0.021:1; the molar ratio of described dianhydride monomer and diamine monomer is 1:1; the volume of described organic solvent and diamine monomer The mass ratio is 13.3mL:1g.

[0013] As a special engineering material, polyimide film is widely used in aviation, aerospace, microelectronics, nanometer, liquid crystal, separation membrane, laser and other fields. Because of its outstanding features in performance and synthesis, its huge application prospects, whether as structural materials or functional materials, have been fully recognized. Thermosetting polyimide has excellent thermal and mechanical properties. The initial thermal decomposition temperature is about 500 ° C. It can withstand extremely low tem...

specific Embodiment approach 2

[0017] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the modified carbon nanotubes are prepared according to the following method:

[0018] Method 1: Add concentrated hydrochloric acid to carbon nanotubes, ultrasonically treat for 8 hours, separate solid and liquid with a centrifuge, centrifuge once, rinse with distilled water, rinse until the pH value of the eluate is neutral, and store in a vacuum oven at 80°C Dry for 2 hours to obtain modified carbon nanotubes; the volume ratio of the carbon nanotubes to concentrated hydrochloric acid is 0.2g:200mL; the carbon nanotubes are single-walled carbon nanotubes or multi-walled carbon nanotubes;

[0019] Method 2: Add mixed acid to the carbon nanotubes, sonicate at room temperature for 8 hours, add distilled water to dilute, then let it stand for 12 hours, pour off the supernatant, filter it with a polytetrafluoroethylene membrane with a pore size of 0.22 μm, and then wash it with de...

specific Embodiment approach 3

[0021] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is: the diamine monomer is diaminodiphenyl ether, p-phenylenediamine, 4,4'-diaminodiphenyl sulfone Or 4,4 diaminodiphenylmethane. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a polyimide / carbon nano-tube X-ray window thin film and a preparation method thereof, relates to the field of material testing in X-ray application and particularly relates to an X-ray window thin film and a preparation method thereof. The invention aims at solving the problems that a beryllium window prepared by the prior art cannot be exposed to air to be used due to toxicity and is difficult to machine. The polyimide / carbon nano-tube X-ray window thin film is prepared from a modified carbon nano-tube, a diamine monomer, a dianhydride monomer and an organic solvent. The preparation method comprises the following steps: one. premixing so as to obtain a premixing liquid; two. carrying out final mixing so as to obtain a colloid to be coated; and three. carrying out coating and hot-imidization treatment, thus obtaining the polyimide / carbon nano-tube X-ray window thin film. The preparation method is mainly used for preparing the polyimide / carbon nano-tube X-ray window thin film.

Description

technical field [0001] The invention relates to the field of material testing for X-ray applications, in particular to an X-ray window film and a preparation method thereof. Background technique [0002] Because in the X-ray band, the absorption coefficient of the material to X-rays decreases with the decrease of the atomic number of the material, the atomic number of beryllium (Be) is 4, and has the characteristics of stable chemical properties and good ductility. As a traditional X-ray Ray window materials are widely used in synchrotron radiation light sources, electron microscopes, X-ray detectors, and X-ray diffractometers, but beryllium is highly toxic and expensive, and it is difficult to be widely used in new X-ray applications. For example, a certain The X-ray windows used in the vacuum chambers of the high and low temperature accessories in some X-ray diffractometers are arc-shaped and exposed to the air. The beryllium windows cannot be used because they are toxic a...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K9/02C08K7/00C08K3/04C08G73/10C08J5/18
CPCC08G73/1007C08J5/18C08J2379/08C08K3/04C08K7/00C08K9/02C08L2203/16C08L79/08
Inventor 费维栋冯宇孙跃王秒
Owner HARBIN INST OF TECH
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