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Micro-structure formation of polylactic acid/epsilon-polycaprolester block copolymer

A technology of block copolymer and polycaprolactone is applied in the field of forming microstructure of polylactic acid/ε-polycaprolactone block copolymer, which can solve the problem that the polymer chain does not produce directional flow, etc. The effect of utilization, reduction of environmental pollution, and improvement of service life

Inactive Publication Date: 2007-04-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patent proposes a processing method for polymer materials, the polymer chain itself does not produce sufficient directional flow

Method used

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  • Micro-structure formation of polylactic acid/epsilon-polycaprolester block copolymer
  • Micro-structure formation of polylactic acid/epsilon-polycaprolester block copolymer
  • Micro-structure formation of polylactic acid/epsilon-polycaprolester block copolymer

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] Example 1. The two ends prepared by the direct melt polycondensation method are polylactic acid prepolymers with carboxyl groups as raw materials, and react with polyε-caprolactone containing terminal isocyanate under vacuum to prepare polylactic acid / ε-polycaprolactone The block copolymer is then prepared as a rectangular parallelepiped spline and put into a mold. The block copolymer is molded at 25°C under a pressure of 1.6GPa for 5 minutes to induce flow to form an "armor structure" (as shown in Figure 3 and Figure 3). 4)

example 2

[0034] Example 2. The block copolymer is processed for 5 minutes near the Tg of PLA (60°C) and under a pressure of 1.6GPa to induce flow molding to form a "layered structure" (as shown in Figures 5 and 6). This phenomenon can be observed from the SEM images of the cross-section and side-section of the sample.

[0035] Example 3. Under the pressure of 1.6GPa, the material is held at different temperatures for 5 minutes, and the mechanical properties of PLA-b-PCL increase greatly. The typical tensile section is shown in Figure 7, and the impact section is shown in Figure 8.

[0036] Table 1. Under the pressure of 1.6GPa for 5 minutes, under different temperature conditions

[0037] Processing temperature

example 4

[0038] Example 4. PLA-b-PCL polymer Under the conditions of 60° C. and 1.6 GPa pressure, the mechanical properties of the material were tested after PLA-b-PCL was molded in a mold for different times.

[0039] Table 2. Under the same pressure and temperature, after different time

[0040] time (min)

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Abstract

A process for generating a special microstructure 'laminated structure' or 'helmet-armour structure' in the polylactic acid / poly-epsilon-caprolactone block copolymer at low temp and under low pressure is disclosed.

Description

technical field [0001] The invention belongs to the field of polymer material physics and its processing, and in particular relates to a method for forming a microstructure of a polylactic acid / ε-polycaprolactone block copolymer. Background technique [0002] Polylactic acid is a renewable biodegradable material, and has the characteristics of non-toxic, degradable and renewable, which meets the requirements of sustainable development. The synthesis and processing of polylactic acid has attracted extensive attention in research at home and abroad. Polylactic acid has a glass transition temperature of about 60°C and a melting point of about 180°C. It is a thermoplastic polymer with similar physical and mechanical properties to polystyrene (PS) and polyester (PET), and its processing performance is good. At present, the processing and molding of polylactic acid mainly adopts melt processing methods, such as melt spinning, injection molding, etc., but since lactic acid polymer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C43/58C08G81/00
Inventor 余木火焦明立滕翠青罗明华韩克清
Owner DONGHUA UNIV