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A polylactic acid-based super-tough blending material with shape memory effects or a polylactic acid-based super-tough high-strength blending nanometer composite material with shape memory effects, and preparing methods thereof

A memory effect, polylactic acid-based technology, applied in the field of polymer materials and their preparation, can solve the problems such as shape memory effect and reduced toughness of composite materials that are not mentioned, and achieve easy promotion, high toughness and strength, and good shape memory performance. Effect

Active Publication Date: 2015-01-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention uses inorganic / natural fibers to reinforce polylactic acid, although the strength of polylactic acid is improved, but its toughness is greatly reduced, and it is not mentioned that the composite material has a shape memory effect

Method used

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  • A polylactic acid-based super-tough blending material with shape memory effects or a polylactic acid-based super-tough high-strength blending nanometer composite material with shape memory effects, and preparing methods thereof
  • A polylactic acid-based super-tough blending material with shape memory effects or a polylactic acid-based super-tough high-strength blending nanometer composite material with shape memory effects, and preparing methods thereof
  • A polylactic acid-based super-tough blending material with shape memory effects or a polylactic acid-based super-tough high-strength blending nanometer composite material with shape memory effects, and preparing methods thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] PLA and GPOE were mechanically mixed at a mass ratio of 80:20, and then the premixed material was put into a multi-sided channel convective screw extruder for melt blending to obtain a PLA-based blended material. The screw speed of the extruder is 20r / min, and the barrel temperature is 170-190°C.

[0030] Figure la is the SEM photo of the prepared 80:20 PLA / GPOE blend material, in which the GPOE phase is etched. It can be seen that the phase morphology of GPOE is micron-sized droplets with an average diameter of about 1.2 μm. The tensile curve of the prepared 80:20PLA / GPOE blend material is shown in Figure 3a The "PLA80" curve shows that the tensile strength of the blended material is 33.6MPa, and the elongation at break is 171.6%, while the elongation at break of PLA is only 2.1% (see Figure 3a "PLA100" curve); by Figure 3b It can be seen that the Izod notched impact strength of the blended material at -20°C is 21.7kJ / m 2 , is PLA (0.82kJ / m 2 ) 26 times, that i...

Embodiment 2

[0032]PLA and GPOE were mechanically mixed at a mass ratio of 90:10, and then the premixed material was put into a multi-sided channel convective screw extruder for melt blending to obtain a PLA-based blended material. The screw speed of the extruder is 20r / min, and the barrel temperature is 170-190°C.

[0033] Figure 1b It is the SEM photo of the prepared 90:10 PLA / GPOE blend material, in which the GPOE phase is etched. It can be seen that the phase morphology of GPOE is micron-sized droplets with an average diameter of about 0.67 μm. The tensile curve of the prepared 90:10PLA / GPOE blend material is shown in Figure 3a The "PLA90" curve shows that the tensile strength of the blended material is 42.2MPa, and the elongation at break is 107.7%; Figure 3b It can be seen that the Izod notched impact strength of the blended material at -20°C is 16.8kJ / m 2 , is PLA (0.82kJ / m 2 ) 20 times, that is, the addition of 10% GPOE and the micron-scale droplet phase morphology greatly ...

Embodiment 3

[0035] PLA and GPOE were mechanically mixed at a mass ratio of 70:30, and then the premixed material was put into a multi-sided channel convective screw extruder for melt blending to obtain a PLA-based blended material. The screw speed of the extruder is 50r / min, and the barrel temperature is 170-190°C.

[0036] Figure lc is the SEM photo of the prepared 70:30 PLA / GPOE blend material, in which the GPOE phase is etched. It can be seen that the phase morphology of GPOE is fiber, and its average aspect ratio is about 19.5. The tensile curve of the prepared 70:30PLA / GPOE blend material is shown in Figure 3a The "PLA70" curve shows that the tensile strength of the blended material is 27.1 MPa, and the elongation at break is 211.1%; Figure 3b It can be seen that the Izod notched impact strength of the blended material at -20°C is 31.7kJ / m 2 , is PLA (0.82kJ / m 2 ) 39 times, that is, the addition of 30% GPOE and the appearance of fiber phase form greatly improved the toughness o...

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Abstract

The invention relates to the technical field of polymer materials and preparation thereof, and particularly relates to a polylactic acid-based super-tough blending material with shape memory effects or a polylactic acid-based super-tough high-strength blending nanometer composite material with shape memory effects, and preparing methods thereof. The blending material comprises polylactic acid, and ethylene-octylene copolymer grafted with glycidyl methacrylate. The composite material comprises polylactic acid, thermoplastic polyurethane and nanometer particles. The materials are prepared by melting and blending by utilization of an extruder. The extruder is a multi-side thread-groove convection type screw extruder. A co-continuous-structure, layered, fibriform or micron liquid drop phase morphology is formed. The nanometer particles are at the interface between two phases of the polylactic acid and an elastomer flexibilizer. The material has characteristics of easily available raw materials and simple processes. The prepared materials have ultra high toughness and strength, and excellent shape memory performance, and have wide application prospects.

Description

technical field [0001] The invention relates to the technical field of polymer materials and their preparation, in particular to a polylactic acid-based super-tough blend material / super-tough high-strength blend nanocomposite material with shape memory effect and a preparation method thereof. Background technique [0002] Shape memory polymer material is a material that can automatically restore its original shape under certain conditions. It has a very wide range of applications, such as sensors, actuators, automatically deformable wings, self-deploying spacecraft solar sails, self-detachable mobile phones, smart fabrics, surgical sutures, fracture fixation tablets, and dental aligners. [0003] Polylactic acid is derived from renewable resources, has good biocompatibility and biodegradability, and can be used in shape memory materials, which has attracted extensive attention. However, the inherent brittleness of PLA itself greatly limits its application range. In order t...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L51/06C08L75/04C08K3/36B29C47/92B29C47/08B29C48/92
Inventor 黄汉雄于文龙俞峰
Owner SOUTH CHINA UNIV OF TECH
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