Strong and tough self-healing dual-response shape memory polylactic acid-based composite material and its preparation method

A dual-response, composite material technology, applied in the field of strong and tough self-healing dual-response shape memory polylactic acid-based composite materials and its preparation, can solve the problems of low resilience, poor shape memory performance, and increased PLA brittleness, etc., to achieve Effects of repairing damage, good balance of rigidity and toughness, and improving compatibility

Active Publication Date: 2020-01-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of preparing composite materials by chemical synthesis is complex and cumbersome, requiring strict control of reaction conditions and Fe 3 o 4 particle size, and use a lot of solvents that are harmful to the environment and human body
The low resilience of PLA leads to its poor shape memory performance, and the material does not have the ability of self-healing
More importantly, Fe 3 o 4 The addition of PLA increases the brittleness of PLA and adversely affects the mechanical properties of PLA. It is difficult to balance the mechanical properties and magnetic shape memory properties, which limits the application range of PLA-based shape memory materials.

Method used

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  • Strong and tough self-healing dual-response shape memory polylactic acid-based composite material and its preparation method
  • Strong and tough self-healing dual-response shape memory polylactic acid-based composite material and its preparation method
  • Strong and tough self-healing dual-response shape memory polylactic acid-based composite material and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Polylactic acid was selected as the matrix resin (Zhejiang Hisun Biomaterials Co., Ltd., racemic polylactic acid (PDLLA)), and ENR‐50 was used as the matrix rubber. In order to reduce rubber elasticity, increase plasticity, and facilitate processing, the epoxidized natural rubber is masticated on an open mill, and the mass fraction of epoxidized natural rubber is 100%, and the average particle size is 50nm. The refined rubber is mixed evenly. In this embodiment, the mass ratio of polylactic acid and epoxidized natural rubber is 70 / 30. First, polylactic acid and 0.2% antioxidant 1010 of the total mass of rubber and plastic were added to a torque rheometer with a temperature and a rotational speed of 170°C and 60r / min, respectively, and melt blended for 3 minutes, and then epoxidized natural For rubber / iron tetroxide blended rubber, after mixing for 3 minutes, add 1.5% dicumyl peroxide to the rubber for dynamic vulcanization, and discharge after 4 minutes. The injection...

Embodiment 2

[0044] Polylactic acid was selected as the matrix resin (Zhejiang Hisun Biomaterials Co., Ltd., racemic polylactic acid (PDLLA)), and ENR‐30 was used as the matrix rubber. In order to reduce rubber elasticity, increase plasticity, and facilitate processing, the epoxidized natural rubber is masticated on an open mill, and the mass fraction of epoxidized natural rubber is 100%, and the average particle size is 50nm. The refined rubber is mixed evenly. In this embodiment, the mass ratio of polylactic acid and epoxidized natural rubber is (60 / 40). First, polylactic acid and 0.2% antioxidant 1010 of the total mass of rubber and plastic were added to a torque rheometer with a temperature and a rotational speed of 170°C and 60r / min, respectively, and melt blended for 3 minutes, and then epoxidized natural For rubber / iron tetroxide blended rubber, after mixing for 3 minutes, add 1.5% dicumyl peroxide to the rubber for dynamic vulcanization, and discharge after 4 minutes. The injecti...

Embodiment 3

[0046] Polylactic acid was selected as the matrix resin (Zhejiang Hisun Biomaterials Co., Ltd., racemic polylactic acid (PDLLA)), and ENR‐50 was used as the matrix rubber. In order to reduce rubber elasticity, increase plasticity, and facilitate processing, natural rubber is masticated on an open mill, and the mass fraction is 75% of epoxidized natural rubber, and the average particle size is 50nm. The rubber is mixed evenly. In this example, the mass ratio of polylactic acid and epoxidized natural rubber is (70 / 30). First, polylactic acid and 0.2% antioxidant 1010 of the total mass of rubber and plastic were added to a torque rheometer with a temperature and a rotational speed of 170°C and 60r / min, respectively, and melt blended for 3 minutes, and then epoxidized natural For rubber / sodium ferric oxide blended rubber, after mixing for 3 minutes, add 1.5% dicumyl peroxide to the rubber for dynamic vulcanization, and discharge after 4 minutes. The injection temperature of the ...

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Abstract

The invention discloses a strong and tough self-repairing double-response shape memory polylactic acid-based composite material and a preparation method thereof. The composite material has a formula comprising the following raw materials in parts by mass: 30-80 parts of polylactic acid, 20-70 parts of epoxidized natural rubber, 10-150 parts of ferroferric oxide, 0.2-1 part of an antioxidant, 0.5-3parts of a vulcanizing agent and 0.1-2.5 parts of a co-crosslinking agent; during preparation, the ferroferric oxide and the epoxidized natural rubber are mixed evenly first to obtain ENR / Fe3O4 grossrubber, then the polylactic acid and the antioxidant are mixed evenly through shearing, the ENR / Fe3O4 gross rubber is added, and the vulcanizing agent and the co-crosslinking agent are added after the mixture is uniform. The polylactic acid-based composite material prepared by the method provided by the invention simultaneously has self-repairing performance, soft magnetic performance, thermallyinduced shape memory performance and magnetically-induced shape memory performance, also has the characteristic of balanced toughness and strength, realizes remote control heating, and can be used inplaces such as human bodies that cannot be directly heated.

Description

technical field [0001] The invention relates to a polylactic acid-based composite material, in particular to a strong and tough self-repairing double-response shape-memory polylactic acid-based composite material and a preparation method thereof. Background technique [0002] Since the 21st century, shape memory polymers have been valued for their light weight, large deformation, low induction temperature, easy processing and low price, and have been widely used in various fields. Shape memory polymers refer to smart materials that can respond to external stimuli and restore their original shape. Among them, thermotropic shape memory polymers adopt temperature-controlled deformation, which has the advantages of easy operation, large deformation and low price. In order to protect the environment and achieve sustainable development, some researchers have invented polylactic acid-based shape memory materials, which have good biodegradability and biocompatibility, and have wide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L15/00C08K3/22C08K5/14
CPCC08K2003/2275C08K2201/01C08L67/04C08L2201/12C08L15/00C08K3/22C08K5/14
Inventor 陈玉坤黄嘉荣曹黎明
Owner SOUTH CHINA UNIV OF TECH
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