Hierarchical porous polylactic acid material and preparation method thereof

A polylactic acid and multi-level porous technology, which is applied in the field of polylactic acid multi-level porous materials and their preparation, can solve the problems of difficult control of pore structure, poor mechanical strength, poor connectivity, etc., and achieves increased porosity, low production cost, and improved The effect of mechanical properties

Active Publication Date: 2019-02-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the existing polylactic acid porous material with single pore size, poor mechanical strength, poor connectivity between pores, and the introduction of organic solvents in the existing polylactic acid porous material preparation method, and the technical problems that the pore structure is difficult to control, providing A kind of polylactic acid hierarchical porous material and preparation method thereof

Method used

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  • Hierarchical porous polylactic acid material and preparation method thereof
  • Hierarchical porous polylactic acid material and preparation method thereof
  • Hierarchical porous polylactic acid material and preparation method thereof

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preparation example Construction

[0031] A kind of preparation method of polylactic acid hierarchical porous material of the present invention, comprises the following steps:

[0032] Step 1. Composite polylactic acid, micron particles and inorganic nanoparticles to obtain a polylactic acid composite material, wherein the mass percent of polylactic acid is 40-70wt%, and the mass percent of micron particles is 10-57wt%, preferably 10-45wt% %, inorganic nanoparticles 3-20wt%;

[0033] Step 2. Stretch the polylactic acid composite material obtained in step 1 through unidirectional or biaxial stretching, the stretching temperature is 55-70°C, the unidirectional stretching ratio is 2.0-4.5 times, and the bidirectional stretching ratio is (1×1) -(3 * 3), obtain polylactic acid hierarchical porous material;

[0034] When uniaxially stretched, a polylactic acid hierarchically porous material in the form of olive-shaped hierarchical pores is obtained, and when biaxially stretched, a polylactic acid hierarchically poro...

Embodiment 1

[0043]PLA (trade name is Natureworks 4032D, D-type lactic acid unit content is 2%, weight average molecular weight is 207KDa), micron silica (average particle diameter is 2μm) and nanometer silica (primary particle average particle diameter is 15nm) According to the weight ratio of 50 / 40 / 10, at 175 ° C, melt blending in an internal mixer at a speed of 60 rpm for 10 minutes, and then made into a sheet, in a universal tensile testing machine at 65 ° C, with a thickness of 5 mm / min rate, stretched 2.7 times, the obtained pore shape is olive-shaped PLA hierarchical porous material.

[0044] After the brittle section of the PLA hierarchical porous material obtained in Example 1 is sprayed with gold, the morphology of the hierarchical porous material obtained by SEM observation is as follows: figure 1 with figure 2 shown. It can be seen from the figure that olive-shaped macropores with a long axis of 5 μm are formed around the microparticles, and olive-shaped micropores with a l...

Embodiment 2

[0046] PLA (trade name is Natureworks 4032D, D-type lactic acid unit content is 2%, weight-average molecular weight is 207KDa), micron calcium carbonate (average particle diameter is 5 μm) and nano silicon dioxide (primary particle average particle diameter is 15nm) by The weight ratio is 60 / 30 / 10, at 175°C, melt blending at a speed of 60 rpm in an internal mixer for 10 minutes, and then made into a sheet, at 65°C in a universal tensile testing machine, at 5mm / The rate of min is stretched 2.7 times, and the pore shape is olive-shaped PLA hierarchical porous material with a porosity of 40%.

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Abstract

The invention relates to a hierarchical porous polylactic acid material and a preparation method thereof, belongs to the technical field of biodegradable polymer porous materials and solves the technical problems that an existing porous polylactic acid material is single in pore diameter, poor in mechanical strength and poor connectivity among pores and a pore structure is difficult to control dueto the introduction of an organic solvent in a preparation method of the existing porous polylactic acid material. The hierarchical porous polylactic acid material disclosed by the invention is prepared by taking polylactic acid as a matrix, the matrix is irregularly distributed with a plurality of micropores and macropores which are in a form of olive-shaped pores or round pores, and long axes of the olive-shaped pores are parallel when both the micropores and the macropores are in the form of the olive-shaped pores. The porous polylactic acid material simultaneously has the micropores and the macropores, the connectivity among the pores is relatively good, the micropores can be interconnected with the macropores, the porosity can reach up to 80% or above, and the mechanical properties are good.

Description

technical field [0001] The invention relates to a polylactic acid hierarchical porous material and a preparation method thereof, belonging to the technical field of biodegradable polymer porous materials. Background technique [0002] As a thermoplastic aliphatic polyester derived from renewable resources, polylactic acid (PLA) not only has good biocompatibility and biodegradability, but also has mechanical strength and processing properties comparable to general polymer materials, so Whether in the field of biomedical materials or in the field of general plastics, PLA has shown broad application prospects. Porous material is one of the important members of materials. Due to its excellent physical and mechanical properties, porous material has become an excellent engineering plastic with dual properties of function and structure. functional structural materials. Porous processing of PLA to make it suitable for material science and biomedicine will further enhance the appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K3/36C08K3/26C08J9/26C08J9/00
CPCC08J9/00C08J9/0066C08J9/0071C08J9/26C08J2201/0422C08J2201/046C08J2367/04C08J2403/02C08K3/36C08K2003/265C08K2201/011
Inventor 韩立晶陈云静董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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