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Preparation method of gradient porous polymer material

A polymer material and gradient porous technology, which is applied in the field of preparation of gradient porous polymer materials, can solve the problems of decreased mechanical properties of products, affecting product performance, and low thermal conductivity of polymers, so as to avoid degradation and reduce mechanical defects. , phase interface smooth effect

Active Publication Date: 2015-05-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the temperature in the high-temperature region of the temperature field is as high as 190-240°C. However, due to the small thermal conductivity of the polymer, it takes a long time to form a temperature field with a gradient distribution in a polymer blend with a large size. The time, and the polymer in the high temperature area for a long time is easy to degrade, especially for the polymer material with poor thermal stability, the degradation in this process is more obvious, the degradation of the polymer will lead to mechanical damage of the product Performance decline, seriously affecting the performance of the product

Method used

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  • Preparation method of gradient porous polymer material

Examples

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Effect test

Embodiment 1

[0036] (1) Preparation of a polymer blend green body with a co-continuous phase structure

[0037] Using PCL and PLA as raw materials, according to the volume ratio of PCL and PLA = 40:60, the above raw materials are dried and premixed at normal pressure and room temperature, and then the premixed raw materials are mixed at 180 with a twin-screw extruder. ℃ melt blending and extruding to obtain a PCL / PLA blend green body with a two-phase continuous structure. cm.

[0038] (2) Preparation of polymer blend body with gradient distribution of co-continuous phase size

[0039] The lower surface (length * width = 1cm * 1cm) of the blend body prepared in step (1) is coated with a polytetrafluoroethylene film, and other surfaces are not coated, such as figure 1 As shown in (a), then place it on the support in the reactor, place the cladding side down, and pass CO into the reactor. 2 And the temperature of reactor is raised to 140 DEG C with the rate of temperature rise of 10 DEG C / ...

Embodiment 2

[0044] (1) Preparation of a polymer blend green body with a co-continuous phase structure

[0045] Using PCL and PLA as raw materials, according to the volume ratio of PCL and PLA = 50:50, the above raw materials are dried and premixed at normal pressure and room temperature, and then the premixed raw materials are mixed at 180 with a twin-screw extruder. ℃ melt blending and extruding to obtain a PCL / PLA blend green body with a two-phase continuous structure. cm.

[0046] (2) Preparation of polymer blend body with gradient distribution of co-continuous phase size

[0047] Cover the surface of the blend body prepared in step (1) except the upper surface (length × width = 1cm × 1cm) with aluminum foil, and then place it on the support in the reaction kettle so that the uncoated surface faces upward placed, and CO was introduced into the reactor 2 And the temperature of reactor is raised to 120 DEG C with the rate of temperature rise of 15 DEG C / min, the pressure in the contro...

Embodiment 3

[0052] (1) Preparation of a polymer blend green body with a co-continuous phase structure

[0053] Using PCL and PLA as raw materials, according to the volume ratio of PCL and PLA = 50:50, the above raw materials are dried and premixed at normal pressure and room temperature, and then the premixed raw materials are mixed at 180 with a twin-screw extruder. ℃ melt blending and extruding to obtain a PCL / PLA blend green body with a two-phase continuous structure. cm.

[0054] (2) Preparation of polymer blend body with gradient distribution of co-continuous phase size

[0055] The upper surface (length × width = 1cm × 1cm) and the left side (width × thickness = 1cm × 0.2cm) of the blend body prepared in step (1) are wrapped with aluminum foil, and then placed in the reaction kettle on the bracket, so that the coated upper surface is placed upwards, and CO is introduced into the reactor 2 And the temperature of reactor is raised to 120 DEG C with the rate of temperature rise of 2...

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Abstract

The invention provides a preparation method of a gradient porous polymer material. The preparation method comprises the following steps: (1) by using two thermoplastic polymers as raw materials, premixing at room temperature, melt-blending and molding; (2) partially cladding a polymer blend green body with a co-continuous phase structure obtained in the step (1) by using the cladding material, placing in a reaction kettle, introducing the gas and warming the reaction kettle, controlling the pressure in the reaction kettle at 5-25 MPa, controlling the temperature of the reaction kettle so that the blend green body is in a molten state, and maintaining for at least 5 min at above pressure and temperature, reducing the temperature of the reaction kettle to the room temperature, and reducing the pressure in the reaction kettle to normal pressure, taking out the blend green body through above treatment and removing the cladding material thereon; (3) soaking the blend green body in gradient distribution with co-continuous phase size obtained in the step (2) in an etching solution to etch, and then taking out to obtain the gradient porous polymer material.

Description

technical field [0001] The invention belongs to the field of porous polymer materials, in particular to a preparation method of gradient porous polymer materials. Background technique [0002] Gradient structures exist in a large number in nature. Bamboo, wood, and bone all have typical gradient porous structures. The dense part of the pore structure makes the material have sufficient strength, and the loose part of the pore structure can effectively reduce the density of the material. Gradient porous polymer material means that the pore size and porosity of the polymer material show a gradient change. Since different parts of the gradient porous polymer material have different structures and properties, it can be applied to the fields of building materials and multifunctional separation or absorption membranes. , and its biomimetic gradient structure makes this kind of material have broad application prospects in the field of biomedicine. At present, there are more studies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/30C08J9/26C08L67/04C08L33/12C08L25/06
Inventor 廖霞何云川戢菁李光宪
Owner SICHUAN UNIV
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