Body-heat-excited polylactic-acid-base biodegradable shape memory material, and preparation method and application thereof
A polylactic acid-based, memory material technology, applied in the field of biomedical polymer materials, can solve the problems of complex preparation process, environmental pollution, human harm, etc., and achieve the effects of simple preparation process, good biological safety, and improved toughness
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Embodiment 1
[0035] In this example, polylactic acid, thermoplastic polyurethane, and polyethylene glycol were mechanically mixed at a mass ratio of 80:20:20, and then the premix was put into an extruder for melt blending to obtain polylactic acid-based biodegradable Degradation of shape memory materials. The screw speed of the extruder is 20r / min, and the barrel temperature is 160-180°C.
[0036] The test results show that the polylactic acid-based biodegradable shape memory material has a glass transition temperature of 46°C, a shape fixation rate of 97.8%, and a shape recovery rate of 96.3%.
[0037] The above-mentioned polylactic acid-based biodegradable shape memory materials are used to make medical fixation devices, specifically:
[0038] (1) Granulate the polylactic acid-based biodegradable shape memory material prepared above, and use an injection molding machine to shape it into a medical fixation device.
[0039] (2) Heat the fixing device prepared in (1) to 51-66°C (5-20°C hi...
Embodiment 2
[0042] In this example, polylactic acid, thermoplastic polyurethane, and polyethylene glycol were mechanically mixed at a mass ratio of 80:20:40, and then the premix was put into an extruder for melt blending to obtain polylactic acid-based biodegradable Degradation of shape memory materials. The screw speed of the extruder is 20r / min, and the barrel temperature is 160-180°C.
[0043] The test results show that the polylactic acid-based biodegradable shape memory material has a glass transition temperature of 32°C, a shape fixation rate of 96.2%, and a shape recovery rate of 97.7%. The shape memory evolution process is as follows: Figure 1~3 shown.
[0044] The above-mentioned polylactic acid-based biodegradable shape memory materials are used to make medical fixation devices, specifically:
[0045] (1) Granulate the polylactic acid-based biodegradable shape memory material prepared above, and use an injection molding machine to mold it into a medical fixation device. At thi...
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