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Shape memory material based on polylactic acid, manufacturing and using process thereof

A memory material, polylactic acid technology, applied in the field of shape memory materials, can solve the problems of low toughness of polylactic acid, limited application scope, etc., and achieve the effects of high toughness, elongation at break, and good shape memory effect.

Inactive Publication Date: 2008-12-10
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent brittleness and low toughness of PLA itself, its application range is limited.

Method used

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  • Shape memory material based on polylactic acid, manufacturing and using process thereof
  • Shape memory material based on polylactic acid, manufacturing and using process thereof
  • Shape memory material based on polylactic acid, manufacturing and using process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] HYBRANE PS2550 from DSM Company was selected, blended with polylactic acid (molecular weight: 200,000) at a mass ratio of 2.5% in a Harker blender. The blending temperature is 180° C., the screw speed is 50 r / min, and the blending time is 5 minutes.

[0032] The blend was injection molded at 175°C to make a dumbbell-shaped mechanical spline with a thickness of 1 mm and a length of 8 cm. Then the blend was placed at 110° C. for about 30 minutes to crystallize and set. The tensile strength is 48.31MPa, the elongation at break is 12.11%, and the degree of recovery is 98%.

[0033] For thermal performance curves see figure 2 , see mechanical properties image 3 .

Embodiment 2

[0035] The selected HYBRANE PS2550 of DSM Company was blended with polylactic acid (molecular weight 80000) at 5% by mass in a Haake blender. The blending temperature is 180° C., the screw speed is 50 r / min, and the blending time is 5 minutes.

[0036] The blend was injection molded at 175°C to make a dumbbell-shaped mechanical spline with a thickness of 1 mm and a length of 8 cm. Then the blend was placed at 110° C. for about 30 minutes to crystallize and set. The tensile strength is 53.17MPa, the elongation at break is 24.01%, and the degree of recovery is 96%.

[0037] Infrared spectrum see figure 1 , thermal performance curve see figure 2 , see mechanical properties image 3 , shape memory effect see Figure 4 .

Embodiment 3

[0039] HYBRANE PS2550 from DSM Company was selected, blended with polylactic acid (molecular weight 120,000) at 10% by mass in a Haake blender. The blending temperature is 180° C., the screw speed is 50 r / min, and the blending time is 5 minutes.

[0040] The blend was injection molded at 175°C to make a dumbbell-shaped mechanical spline with a thickness of 1 mm and a length of 8 cm. Then the blend was placed at 110° C. for about 30 minutes to crystallize and set. The tensile strength is 48.81MPa, the elongation at break is 43.06%, and the degree of recovery is 94%.

[0041] Infrared spectrum see figure 1 , thermal performance curve see figure 2 , see mechanical properties image 3 , shape memory effect see Figure 4 .

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Abstract

The invention provides a shape memory material on the basis of polylactic acid and a preparation method thereof. The shape memory material is characterized by consisting of the polylactic acid and hyper branched polyesteramide, wherein, the weight portion of the polylactic acid is between 80 and 98 portions and the weight portion of the hyper branched polyesteramide is between 2 and 20 portions. The shape memory material has the advantage that various performances of a product such as the mechanical intensity, the breaking elongation and the degree of crystallinity can be controlled by changing the ratio of the hyper branched polyesteramide to the polylactic acid and mixing the two. The general polylactic acid material is easy to rupture when subject to a stretching or bending stress. The polylactic acid material overcomes the shortcoming of brittleness of the pure polylactic acid and has high toughness and elongation at break. Therefore, the polylactic acid material does not break at a high draw ratio, can restore to the prior shape by being heated and has good shape memory effect.

Description

technical field [0001] The invention relates to a shape memory material based on a degradable polymer material and its preparation and application. Background technique [0002] Shape memory materials mainly include shape memory alloys and shape memory polymers. Shape memory polymer refers to a polymer material that can automatically restore its original shape under certain conditions. For example, a material that was originally curled can return to its original curled state at a certain temperature after being stretched into a strip shape. The shape memory function of shape memory polymers is mainly derived from the existence of two incompletely compatible phases inside the material—the stationary phase that maintains the shape of the molded product and the reversible phase that undergoes reversible softening-hardening changes with temperature changes. Shape memory polymer materials have important application significance in assembly and positioning in machining, and in me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L77/12B29C47/92B29C48/92
Inventor 张瑜张伟陈彦模陈龙阎慧至张新忠
Owner DONGHUA UNIV
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