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Polyacrylonitrile modified starch nano-fiber and preparation method thereof

A technology of polyacrylonitrile and starch nanometers, applied in fiber treatment, fiber chemical characteristics, single-component synthetic polymer rayon, etc., can solve the problems of low strength and poor hydrophobicity, and achieve easy film formation and good hydrophobicity , Increase the effect of water solubility

Inactive Publication Date: 2017-05-24
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, in the process of preparing pure starch nanofibers by electrospinning, it has been found that pure starch electrospinning is easy to obtain nanospheres, and the nanofibers prepared by pure starch have extremely poor hydrophobicity and low strength. The environment can quickly dissolve and deform, thereby limiting its use

Method used

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  • Polyacrylonitrile modified starch nano-fiber and preparation method thereof
  • Polyacrylonitrile modified starch nano-fiber and preparation method thereof
  • Polyacrylonitrile modified starch nano-fiber and preparation method thereof

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Embodiment 1

[0035] The invention provides a method for preparing polyacrylonitrile modified starch nanofibers, the specific preparation steps are as follows:

[0036] ① Preparation of starch grafted polyacrylonitrile polymer

[0037] 6.4g of soluble starch and 320mL of water were gelatinized at 80°C for 1 hour, then cooled to room temperature. Then in N 2 Under protection, add 3.3g ammonium cerium nitrate successively and adjust the pH value to 1 with nitric acid, after reacting for 1 hour, add 29mL acrylonitrile, N 2 React under protection for 2 hours, then soak and wash in DMF, and dry the obtained product at 60°C to obtain the target product;

[0038] ② Preparation of spinning solution for polyacrylonitrile modified starch polymer

[0039] Dissolving the starch-grafted acrylonitrile polymer obtained in step ① in DMSO, heating to 70° C. to dissolve to obtain a spinning solution containing 4.7wt% starch-grafted acrylonitrile polymer;

[0040] ③Nanofibers of polyacrylonitrile modified...

Embodiment 2

[0043] A method for preparing polyacrylonitrile modified starch nanofibers, the specific preparation steps are as follows:

[0044] ① Preparation of starch grafted polyacrylonitrile polymer

[0045] 6.4g of soluble starch and 320mL of water were gelatinized at 80°C for 1 hour, then cooled to room temperature. Then in N 2 Under protection, add 3.3g ammonium cerium nitrate successively and adjust the pH value to 1 with nitric acid, after reacting for 1 hour, add 29mL acrylonitrile, N 2 React under protection for 2 hours, then soak and wash in DMF, and dry the obtained product at 60°C to obtain the target product;

[0046] ② Preparation of spinning solution for polyacrylonitrile modified starch polymer

[0047] Dissolving the polymer obtained in step ① in dimethyl sulfoxide DMSO, heating to 70°C to dissolve to obtain a spinning solution containing 4.7wt% starch-grafted acrylonitrile polymer;

[0048] ③Nanofibers of polyacrylonitrile modified starch

[0049] Use a syringe to ...

Embodiment 3

[0051]A method for preparing polyacrylonitrile modified starch nanofibers, the specific preparation steps are as follows:

[0052] ① Preparation of starch grafted polyacrylonitrile polymer

[0053] 6.4g of soluble starch and 320mL of water were gelatinized at 80°C for 1 hour, then cooled to room temperature. Then in N 2 Under protection, add 3.3g ammonium cerium nitrate successively and adjust the pH value to 1 with nitric acid, after reacting for 1 hour, add 29mL acrylonitrile, N 2 React under protection for 2 hours, then soak and wash in DMF, and dry the obtained product at 60°C to obtain the target product;

[0054] ② Preparation of spinning solution for polyacrylonitrile modified starch polymer

[0055] Dissolving the starch-grafted acrylonitrile polymer obtained in step ① in DMSO, heating to 70° C. to dissolve to obtain a spinning solution containing 4.7wt% starch-grafted acrylonitrile polymer;

[0056] ③Nanofibers of polyacrylonitrile modified starch

[0057] Use a ...

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Abstract

The invention discloses a polyacrylonitrile modified starch nano-fiber and a preparation method thereof. The method comprises the following steps: preparing a starch grafted acrylonitrile polymer; dissolving the polymer into an organic solvent to prepare an electrostatic spinning liquid; and preparing the polyacrylonitrile modified starch nano-fiber by adopting an electrostatic spinning process, wherein (1) gelatinizing starch in an aqueous solution under N2 protection, and initiating the acrylonitrile to perform free radical polymerization with ceric ammonium nitrate under an acid condition to obtain a starch grafted acrylonitrile; (2) preparing electrostatic spinning liquid from the substance obtained in the step (1) for electrostatic spinning; and (3) preparing the polyacrylonitrile modified starch nano-fiber by adopting an electrostatic spinning process under a condition that the spinning environment temperature is 30-60 DEG C. The polyacrylonitrile modified starch nano-fiber preapred by adopting the method has a diameter of 80-600nm, and has relatively uniform diameter, does not have beading or fracturing; and the hydrophobic property, spinning property and film forming property of the material can be reinforced.

Description

technical field [0001] The invention relates to a preparation method for preparing modified starch nanofibers by electrospinning; in particular, it relates to a preparation method for electrospinning modified starch nanofibers containing polyacrylonitrile. Background technique [0002] Starch is a kind of natural polymer, which has the advantages of wide source, low price, good compatibility and renewable, etc. It is widely used in food, papermaking, medicine and other fields. However, native starch has poor hydrophobicity and film-forming properties, low mechanical properties and easy degradation, which will limit the application of starch in various fields. Therefore, according to the chemical structure of starch, people have modified it to make a series of changes in various properties of starch, and at the same time broaden the application field of starch. [0003] It has been found that micron-scale or nano-scale microfibers of polymers have large specific surface area...

Claims

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Application Information

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IPC IPC(8): D01F6/28C08F251/00C08F220/44D01D5/00
CPCD01F6/28C08F251/00D01D5/003C08F220/44
Inventor 宫玉梅李苗苗郭静夏英刘元法
Owner DALIAN POLYTECHNIC UNIVERSITY
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