Preparation method of polymer blended functionally gradient composite material

A gradient function and composite material technology, which is applied in the preparation field of polymer blend gradient function composite materials, can solve problems such as mutual entanglement, phase separation difficulties, thick gradient membrane materials, etc., to avoid structural deformation and damage, and industrial implementation The effect of strong resistance and environmental protection of the process route

Active Publication Date: 2018-01-19
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the reported preparation methods of polymer/polymer gradient materials are difficult to achieve effective production and application.
Whether it is a solution system or a molten system, the diffusion and movement speed of molecular chains is very slow, and it takes a long time to complete phase separation to produce a gradient structure. Diffusion of components, but the extra time required for solvent volatilization is not enough to make up for the time saved by diffusion, and it is difficult to obtain thicker gradient membrane materials (generally at the micron lev

Method used

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  • Preparation method of polymer blended functionally gradient composite material
  • Preparation method of polymer blended functionally gradient composite material
  • Preparation method of polymer blended functionally gradient composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: A kind of preparation method of polymer blend gradient functional composite material, comprises the following steps:

[0029] Step 1: Preparation of blend system

[0030] Weigh 10g of epoxy resin (model E51), 4g of polyamide (model 651), 3g of negatively charged polybutylacrylate micro-nanospheres (diameter is 2um) and blend them, stir mechanically for 5 minutes, and then mix them at room temperature. Ultrasonic dispersion was performed for 30 minutes, and the power of the ultrasonic dispersion device was controlled to 700w.

[0031] Step 2: Form gradient structure driven by DC electric field

[0032] Put the mixed liquid into a transparent conductive glass mold with a thickness of 1mm and connect the positive and negative electrodes. The mold is placed on a heating platform with adjustable temperature. After applying a DC voltage of 2000V / mm, the sample is maintained at 40°C for 30 minutes. After the epoxy resin is gelled, the electric field is removed,...

Embodiment 2

[0033] Embodiment 2: a kind of preparation method of polymer blend gradient functional composite material, comprises the following steps:

[0034] Step 1: Preparation of blend system

[0035] Take by weighing 10g acrylic resin (the model is NOA65, produced by Norland Company), 3g positively charged polystyrene micro-nanospheres (diameter is 2um) blending, first mechanically stirred for 5 minutes, then ultrasonically dispersed at normal temperature for 30 minutes, The power control of the ultrasonic dispersing device is 700w.

[0036] Step 2: Form gradient structure driven by DC electric field

[0037] Put the mixed liquid into a transparent conductive glass mold with a thickness of 1mm and connect the positive and negative electrodes. After applying a DC voltage of 600V / mm, the sample is maintained at 40°C for 10 minutes, cured with 360nm ultraviolet light for 3s, and then the electric field is removed. , to obtain the functional gradient material with polystyrene micro-nano...

Embodiment 4

[0043] Embodiment 4: a kind of preparation method of polymer blend gradient functional composite material, comprises the following steps:

[0044] Step 1: Preparation of blend system

[0045] Weigh 10g of epoxy resin (type E51), 3g of polyamide (type 651), 6g of polybutylacrylate micro-nanospheres (2um in diameter), mechanically stir for 5 minutes, then ultrasonically disperse at room temperature for 30 minutes, and ultrasonically disperse The power control of the device is 700w.

[0046] Step 2: Form gradient structure driven by DC electric field

[0047] Put the mixed liquid into a transparent conductive glass mold with a thickness of 1mm and connect the positive and negative electrodes. The mold is placed on a heating platform with adjustable temperature. After applying a DC voltage of 2000V / mm, the sample is maintained at 40°C for 30 minutes. After the epoxy resin is gelled, the electric field is removed, and the temperature is raised to 70°C for 2 hours. After the epoxy...

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Abstract

The invention discloses a preparation method of a polymer blended functionally gradient composite material. The method comprises the following steps: 1) preparation of a blending system: dispersing charged polymer micronanospheres into a solvent-free liquid-state polymer matrix for blending, to obtain a blend; and 2) formation of a gradient structure through driving of a direct-current electric field: adding the blend between energized positive and negative electrodes, leading the charged polymer micronanospheres to move towards the electrode with opposite charges in the liquid-state polymer matrix to form gradient distribution under the driving of a high-voltage direct-current electric field, and moving the electric field after the liquid-state polymer matrix is cured. The long molecularchain of the polymer is curled into the polymer micronanospheres which are dispersed into another polymer matrix so as to reduce the processing viscosity and improve the phase separation speed, and then the microspheres are driven by utilizing the high-voltage electric field and the concentration gradient can be generated through electrophoresis movement, thus obtaining a gradient structure with gradually varied composition and properties.

Description

technical field [0001] The invention relates to the technical field of preparation of new materials, in particular to a preparation method of a polymer blend gradient functional composite material. Background technique [0002] In nature, gradient structures are widely found in biological materials such as plant stems, animal bones and teeth. Some biological tissues with soft-hard gradients can act as "shock absorbers" when subjected to external shocks, protecting the fragile internal tissue structures by effectively transferring and dissipating energy. Grapefruit is one of the typical representatives with excellent damping properties. Studies have found that when a grapefruit falls from a high place, the 2-3cm thick grapefruit peel with a gradient porous structure can dissipate about 90% of the impact energy, thereby protecting the inner tissue These gradient microstructures bring inspiration to the preparation of high-performance damping materials. The construction of pol...

Claims

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Application Information

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IPC IPC(8): C08L25/06C08L63/00C08L83/04C08L33/00C08L77/00C08L33/08C08J3/00
Inventor 刘学清刘继延张畅陈佳邹立勇刘飞燕尤庆亮
Owner JIANGHAN UNIVERSITY
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