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Multi-arm block copolymer, preparation method and application of multi-arm block copolymer in improvement of mechanical property of poly-L-lactic acid thereof

The technology of a block copolymer and L-polylactic acid is applied in the application field of improving the mechanical properties of L-polylactic acid, which can solve the problems of poor compatibility and inability to effectively improve the mechanical properties, and achieve good transparency and good dispersion behavior. , the effect of improving mechanical properties

Active Publication Date: 2013-05-08
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when polycaprolactone is used as a polymer additive, due to its phase separation behavior after blending with L-polylactic acid, the compatibility is relatively poor, resulting in that the mechanical properties cannot be effectively improved.

Method used

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  • Multi-arm block copolymer, preparation method and application of multi-arm block copolymer in improvement of mechanical property of poly-L-lactic acid thereof
  • Multi-arm block copolymer, preparation method and application of multi-arm block copolymer in improvement of mechanical property of poly-L-lactic acid thereof
  • Multi-arm block copolymer, preparation method and application of multi-arm block copolymer in improvement of mechanical property of poly-L-lactic acid thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: the synthesis of multi-arm block copolymer

[0047] 1) Synthesis of 4a-PCL-b-PDLA

[0048] synthetic circuit such as figure 1 shown. First, the reaction device was evacuated 3 times and protected by argon, and then 8.36g ε-caprolactone, 0.2041g erythritol, 126L of stannous octoate in toluene (0.846mol / L) and 10mL of toluene were placed under argon protection. Add it to the reaction tube, seal it and react at 110°C for two days. Then, the temperature of the reaction tube was lowered to room temperature, and 8.36 g of D-lactide was added into the reaction tube under the protection of argon, and then placed in an oil bath at 110° C. to continue the reaction for 2 to 3 days. After the reaction was completed, it was cooled to room temperature, and the reaction product was repeatedly dissolved / precipitated three times through dichloromethane / methanol (v / v=1 / 10), and finally the product was placed in a vacuum oven at 80°C and vacuum-dried until the quality was...

Embodiment 2

[0055] Embodiment 2: Preparation of multi-arm block copolymer and L-polylactic acid blend (i.e. modified polylactic acid)

[0056] The following takes the blending of the four-arm block copolymer 4a-PCL-b-PDLA prepared in Example 1 and L-PLA as an example. The blending of other multi-arm block copolymers and L-PLA has the same experimental conditions.

[0057] 1) Melt blending

[0058] Weigh 5g of 4a-PCL-b-PDLA and 45g of poly-L-lactic acid (PLLA) (Natureworks, USA, model 2002D) respectively, and process multi-arm block copolymer and poly-L-lactic acid with HAAKE twin-screw internal mixer. Melt blending, the conditions are as follows: the melting temperature of the blend is 170-230° C., the blending speed is 10 rad / min for the first 2 minutes, and 50 rad / min for the last 8 minutes.

[0059] 2) Preparation of splines

[0060] The blend splines were injection molded through a HAAKE MINI JET II with a capacity of 10 cc according to ISO527-2-5A standard. Put the sample obtained...

Embodiment 3

[0063] Embodiment 3: Preparation of multi-arm block copolymer and L-polylactic acid blend (i.e. modified polylactic acid)

[0064] The amount of 4a-PCL-b-PDLA in step 1) of Example 2 was replaced by 2.5g, the amount of L-polylactic acid (PLLA) was replaced by 47.5g, and the other conditions were the same as in Example 2, and a modified polylactic acid sample was prepared. .

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Abstract

The invention discloses a multi-arm block copolymer and a preparation method as well as an application of the multi-arm block copolymer. Each arm of the multi-arm block copolymer is structured by a soft section and a hard section, wherein the soft section is poly-dl-lactide, or polycaprolactone or a copolymer of the poly-dl-lactide and the polycaprolactone; the hard section is poly-dextrolactic acid; a stereo composite crystal is formed through the poly-dextrolactic acid and the poly-dl-lactide of the multi-arm block copolymer and plays a role of a physical cross-link point; a multi-arm block copolymer system is fused and blended with the poly-dl-lactide, then a blend is formed by injection molding and a certain constant-temperature annealing treatment is carried out, so that the breaking elongation of the poly-dl-lactide can be obviously increased; and the multi-arm block copolymer can play a role of accelerating crystallization in the process of isothermal crystallization and still can retains good degradation and transparence properties, so that the important application prospects of the multi-arm block copolymer in modification of the mechanical property of the poly-L-lactic acid are shown.

Description

technical field [0001] The invention relates to a multi-arm block copolymer, a preparation method and its application in improving the mechanical properties of L-polylactic acid. Background technique [0002] With the dwindling of petroleum resources, the source of traditional plastics has become more and more difficult, leading to an increase in its price, and plastic products are difficult to decompose under natural conditions after being discarded, causing great pollution to the environment. Polylactic acid is not dependent on petroleum resources because its monomers are derived from food starch (such as corn), and it is biodegradable, and there is no white garbage problem, which greatly reduces energy consumption and environmental pollution. In recent years, polylactic acid, especially poly-L-lactic acid (PLLA), which is expected to be a substitute for traditional plastics, has been extensively studied at home and abroad (Anderson K et al. Toughening polylactide. Polymer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08L67/04
Inventor 宁振勃蒋妮甘志华
Owner INST OF CHEM CHINESE ACAD OF SCI
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