Method for preparing poly-p-xylylene nano fibers through chemical vapor deposition

A chemical vapor deposition, parylene technology, applied in the field of materials, achieves the effects of simple reaction conditions, avoidance of by-products, and controllable morphology

Active Publication Date: 2017-12-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of low production efficiency, solvent post-treatment and environmental pollution in traditional fiber manufacturing technology, the present invention provides a simple, efficient and mild method for preparing po

Method used

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  • Method for preparing poly-p-xylylene nano fibers through chemical vapor deposition
  • Method for preparing poly-p-xylylene nano fibers through chemical vapor deposition
  • Method for preparing poly-p-xylylene nano fibers through chemical vapor deposition

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Experimental program
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Effect test

Embodiment 1

[0027] Preparation of parylene nanofibers: The glass sheet and copper mesh were ultrasonically treated with absolute ethanol to remove surface impurities. Then, the cleaned glass sheet is treated with a silane coupling reagent for a period of time and then used for later use. Place the nematic liquid crystal on a glass plate with a copper grid, and use a 10 μl micro-syringe to take 7 μl of liquid crystal on the copper grid. Place the prepared glass slide on the sample stage of the deposition chamber. The precursor of CVD reaction is 10g p-xylene dimer. Raise the temperature of the cracking chamber to the target temperature of 530°C, while keeping the system at a relatively low vacuum. After the temperature of the deposition area reaches the set temperature, increase the vacuum. When it reaches 0.08 Torr, at a certain deposition rate Perform CVD polymerization. The active free radicals cracked by CVD grow along the gaps between liquid crystal molecules. After the CVD, the C...

Embodiment 2

[0029] Preparation of parylene nanofibers (other steps are the same as in Example 1): 10g of p-xylene dimer is placed in the CVD sublimation zone, the cracking temperature is 550°C, and the deposition rate is The sample stage temperature was 0 °C. CVD polymerization was performed on nematic liquid crystal E7. After soaking with absolute ethanol, the nanofibers were obtained after drying.

Embodiment 3

[0031] Preparation of parylene nanofibers (other steps are the same as in Example 1): 10 g of 4-hydroxymethyl-p-xylylene dimer is placed in the CVD sublimation zone, the cracking temperature is 500 ° C, and the deposition rate is The sample stage temperature was -10°C. CVD polymerization was performed on nematic liquid crystal E7. After soaking with hexane, the nanofibers were obtained after drying.

[0032] like figure 2 As shown, a and b represent PPX-N nanofibers and PPX-CH 2 OH nanofibers. It can be seen from the figure that the PPX-N nanofibers at 3100cm -1 Left and right and 1650~1450cm -1 This is the characteristic absorption peak of PPX benzene ring. 2922cm -1 and 2855cm -1 is the stretching vibration absorption peak of methylene, and PPX-CH 2 In addition to the characteristic peaks of PPX-N in the infrared characteristic peaks of OH nanofibers, at 3350cm -1 The -OH characteristic absorption peak appeared at , which indicated that parylene nanofibers could ...

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Abstract

The invention discloses a method for preparing poly-p-xylylene nano fibers through chemical vapor deposition and belongs to the technical field of materials. The method disclosed by the invention comprises the following steps: by adopting a chemical vapor deposition technology, by taking poly-p-xylylene as a precursor and taking nematic liquid crystal as a template, successfully preparing the poly-p-xylylene nano fibers through a vapor deposition polymerization reaction. The preparation method has the characteristics of being controllable in size, shape and composition of the fibers, the defects such as solvent after-treatment problems, severe environmental pollution and the like existing in the fiber preparation by the traditional electrospinning method are overcome, and the obtained nano fibers can be applied to drug delivery systems, tissue engineering, micro-fluid devices and the like and have extremely high application values.

Description

technical field [0001] The invention belongs to the technical field of materials and relates to the preparation of polymer nanofibers, in particular to a method for preparing parylene nanofibers by chemical vapor deposition. Background technique [0002] In recent years, polymer nanofibers have been used in many fields such as nanosensors, tissue engineering scaffolds, filter media, drug delivery, artificial blood vessels, biochips, and military protection due to their unique advantages such as ultra-high specific surface area, good flexibility, and ductility. Clothing, optics, and composite materials have shown strong vitality, and have become research hotspots in the fields of polymer materials, biomedicine, and the like. At present, the research hotspots of polymer nanofibers are mainly concentrated in the field of biomedicine, which can be used as functional membranes, cell scaffolds, biomimetic materials, cell carriers, etc. [0003] The common preparation methods of n...

Claims

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Application Information

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IPC IPC(8): C08G61/02D01F6/76
CPCC08G61/025C08G2261/11C08G2261/1414C08G2261/1422C08G2261/3424D01F6/76
Inventor 谢璠卓龙海陆赵情胡文静秦盼亮
Owner SHAANXI UNIV OF SCI & TECH
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