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Polylactic acid and electron beam radiation modified method for derivative of the same

A technology of electron beam radiation and polylactic acid, which is applied in the field of modification of polylactic acid and its derivatives, to achieve the effects of expanding the application field, shortening the preparation cycle, and expanding the scope of the system

Inactive Publication Date: 2008-01-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of modified polylactic acid can be used as a drug sustained release material, which is only suitable for the field of medicine

Method used

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  • Polylactic acid and electron beam radiation modified method for derivative of the same
  • Polylactic acid and electron beam radiation modified method for derivative of the same
  • Polylactic acid and electron beam radiation modified method for derivative of the same

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Heat polylactic acid (polylactic acid 1) to 180°C for 3 minutes, then cool to room temperature, and cold press at room temperature to form a sheet or film; pass nitrogen to discharge the air in the irradiation room of the electron beam equipment, when the oxygen concentration in the irradiation room drops When it reaches 1mg / L, start the electron beam equipment, send the polylactic acid sheet or film into the irradiation chamber of the electron beam equipment, close the irradiation chamber; irradiate with electron beam at room temperature (25°C), and the radiation dose is 55kGy. The obtained modified polylactic acid has a softening temperature of 70° C., a tensile strength of 5.0 MPa, an elongation at break of 20.9 percent, and a biodegradation rate of 96 percent within 140 hours.

Embodiment 2

[0062] Heat acrylic acid-terminated polylactic acid (polylactic acid 2, R is an acrylic acid group (b)) to 180 ° C for 3 minutes, then cool to room temperature, and cold press at room temperature to form a sheet or film; blow nitrogen to discharge the electron beam equipment Irradiate the air in the room. When the oxygen concentration in the irradiation room drops to 20mg / L, start the electron beam equipment, send the acrylic acid-terminated polylactic acid sheet or film into the irradiation room of the electron beam equipment, and close the irradiation room; at room temperature (25 ℃) with electron beam radiation, the radiation dose is 105kGy. The softening temperature of the obtained modified acrylic-terminated polylactic acid is 191° C., the tensile strength is 39.6 MPa, the elongation at break is 13.1%, and the biodegradation rate is 68% within 140 hours.

Embodiment 3

[0064] Heat the block polyethylene glycol-polylactic acid copolymer (polylactic acid 3) to 180°C for 3 minutes, then cool to room temperature, and cold press at room temperature to form a sheet or film; blow nitrogen to exhaust the electron beam equipment irradiation room Air, when the oxygen concentration in the irradiation room drops to 100mg / L, start the electron beam equipment, send the block polyethylene glycol-polylactic acid copolymer sheet or film into the irradiation room of the electron beam equipment, and close the irradiation room; Electron beams were used to irradiate at room temperature (23° C.), and the radiation dose was 10 kGy. The obtained modified block polyethylene glycol-polylactic acid copolymer has a softening temperature of 73° C., a tensile strength of 8.9 MPa, an elongation at break of 367.8%, and a biodegradation rate of 91% within 140 hours.

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Abstract

Disclosed is an electron beam irradiation modification method of polylactic acid and the derivate of the polylactic acid. The polylactic acid and the derivate of the polylactic acid are made into the needed form which is put into the nitrogen or vacuum environment and then is modified by the electron beam irradiation in the room temperature with the amount of radiation agent of 10 to 220kGy. The polylactic acid and the derivate of the polylactic acid can be made into the forms of film, sheet, plate and bar which are radiated in low energy, middle energy or high energy electron beam. The energy of the low energy electron beam is0.15 to 0.5 Mev; the energy of the middle energy electron beam is over 0.5 to 5 MeV; the energy of the high energy electron beam is over 5 to 10 MeV. Sensitizer can be added in order to control the cross-linking level of the polylactic acid and the derivate of the polylactic acid further with a weight ratio of the sensitizer and the and the derivate of the polylactic acid of 0.5: 100 to 30:100.

Description

technical field [0001] The invention belongs to the field of modification methods of polylactic acid and derivatives thereof, and particularly relates to a method for modifying polylactic acid and derivative systems of various structures by electron beam radiation. Background technique [0002] Polylactic acid (PLA) is a type of polymer synthesized from lactic acid, the product of microbial fermentation. Under the action of microorganisms, it can be completely decomposed into water and carbon dioxide. It is non-toxic, non-irritating to the human body, and has good biocompatibility. An environmentally friendly green polymer material. At present, the application of polylactic acid is becoming more and more extensive, involving food, medicine, agriculture and other fields; at the same time, the preparation of biodegradable polylactic acid engineering materials has received extensive attention. [0003] Polylactic acid synthesis methods include: ① direct polycondensation of lac...

Claims

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Application Information

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IPC IPC(8): C08J7/18C08L67/04
Inventor 杨刚缪培凯唐文睿曾科唐艳周柯王宜鹏周鸿飞刘韬
Owner SICHUAN UNIV
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