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Method for improving polyglycol plasticization polylactic acid strength of materials capability by process

A technology of plasticizing polylactic acid and polyethylene glycol, which is applied in the field of polylactic acid, can solve the problems of toughening effect and mechanism, and achieve the effect of improving appearance performance, tensile performance and bending performance

Inactive Publication Date: 2008-06-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the toughening effect and mechanism of materials in processing are still very little

Method used

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  • Method for improving polyglycol plasticization polylactic acid strength of materials capability by process
  • Method for improving polyglycol plasticization polylactic acid strength of materials capability by process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The shape of the PEG plasticized PLA sample prepared by injection molding and the processed shape (as shown in Figure 1) and the schematic diagram of the self-made mold processing process (as shown in Figure 2), the impact section of the unprocessed PEG plasticized PLA sample (as shown in Figure 3 ).

Embodiment 2

[0030] According to the method described in Example 1, PEG-plasticized PLA strips with different crystallization times at 80°C were kept at 70°C and a pressure of 250 MPa for 5 minutes. The mechanical properties of the strips without heat treatment after molding are shown in Table 1.

[0031] Table 180°C Mechanical properties of molded strips without heat treatment at different crystallization times

[0032] Crystallization time of the strip at 80°C

Embodiment 3

[0034] According to the method described in Example 1, the PEG-plasticized PLA strips crystallized for 2.5 minutes were kept at 250 MPa for 5 minutes under different temperature conditions. The mechanical properties of the molded strips without heat treatment are shown in Table 2.

[0035] Table 2 Mechanical properties of unheated strips after molding at different processing temperatures

[0036] Spline processing temperature (°C)

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Abstract

The invention relates a press-working and solid forming method for improving the mechanical properties of polylactic acid (PLA) material plasticized with polyethylene glycol (PEG). The steps include: (1) preparation of PLA spline plasticized with PEG; (2) press-working and solid forming of the PLA spline plasticized with PEG; (3) heat treatment after the forming. The impacting property of PLA plactics plasticized with PEG can be increased by dozens of times, the stretching property can be increased by two times, solid motion of samples occurs by employing the method to give force on the samples, and in the process of solid motion, the internal microstructure of the material is improved, thereby achieving the purpose of improving the mechanical properties.

Description

technical field [0001] The invention belongs to the field of polylactic acid, in particular to a method for improving the mechanical properties of polyethylene glycol plasticized polylactic acid through solid-state forming by pressure processing. Background technique [0002] As a biodegradable polymer material, polylactic acid has been extensively studied due to its biodegradable and renewable biofriendly properties. However, due to the slow crystallization rate and strong molecular chain rigidity of polylactic acid itself, the material has poor toughness, and it can only be used as a packaging material, which limits its wide application. Generally, the impact performance can be improved by plasticizing and blending modification. However, at the same time of modification, the decline in tensile properties severely limits the use of materials. In recent years, there are many methods for studying blend toughening, and a large number of toughening models have emerged. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/00B29C45/76B29C43/58B29C71/02C08L67/04C08L71/08
Inventor 余木火焦明立高朋滕翠青韩克清袁象恺
Owner DONGHUA UNIV
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