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Modified polyactic acid and preparation method thereof

A technology of polylactic acid and dextrorotatory polylactic acid, which is applied in the field of modified polylactic acid and its preparation, can solve the problems of poor interaction, limiting the performance of PLA/montmorillonite composite materials, and difficulty in uniform dispersion of montmorillonite, and achieves phase Good capacity, improved strength and toughness, and high tensile elastic modulus

Inactive Publication Date: 2013-03-27
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor interaction between the polar montmorillonite layer and the non-polar PLA matrix, it is difficult for montmorillonite to disperse uniformly in the organic matrix, which limits the improvement of the performance of PLA / montmorillonite composites.

Method used

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  • Modified polyactic acid and preparation method thereof
  • Modified polyactic acid and preparation method thereof
  • Modified polyactic acid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1. Preparation of modified polylactic acid by blending star-shaped multi-arm PDLA and linear PLLA

[0048] 1. Synthesis of linear PLLA matrix with a molecular weight of 40k

[0049] Under the protection of argon, add 0.0155g initiator ethylene glycol (Glycol), 10g L-lactide monomer (LLA), 0.012ml concentration in the dry 200ml reaction bottle successively and be 0.829mol / L stannous octoate ( SnOct 2 ) in toluene and 30ml of dry toluene. The reaction vial was sealed and placed in an oil bath at 120°C for 20 h. It was then dissolved in dichloromethane, precipitated with methanol, washed three times, and dried in vacuo to obtain linear PLLA.

[0050] The molecular weight and molecular weight distribution of the prepared linear PLLA are shown in Table 1.

[0051] 2. Synthesis of star-shaped six-arm branched PDLA (n=4) with a molecular weight of 400k

[0052] Under the protection of argon, add 0.0045g initiator sorbitol (sorbitol), 10g D-lactide monomer, 0.0036m...

Embodiment 2

[0057] Example 2, Modified polylactic acid prepared by blending comb-like multi-arm PDLA and linear PLLA

[0058] 1. Synthesis of comb-shaped twenty-nine-arm branched PDLA (n=29) with a molecular weight of 200k

[0059] (1) Macromolecular initiator-copolymer of polyethylene glycol and polyglycidyl alcohol containing twenty-nine hydroxyl groups (PEG 214 -co-PG 29 ) (synthetic method according to literature: Preparation of NovelPoly(ethylene oxide-co-glycidol)-graft-Poly(ε-caprolactone) Copolymers and Inclusion Complexation of the Grafted Chains with α-Cyclodextrin. Juan Huang, Zhongyu Li, Xuewei Xu, Yong Ren, Junlian Huang. Journal of Polymer Science: Part A: Polymer Chemistry, 2006, 44, 3684-3691).

[0060] ① Preparation of Vinyl Ether Glycidyl Alcohol:

[0061] Add 100mL ethyl vinyl ether and 25g glycidol to a dry and clean 500mL three-neck flask respectively. Dissolve 0.625 g of p-toluenesulfonic acid in 20 mL of diethyl ether, and add the diethyl ether solution dropwise...

Embodiment 3

[0073] Example 3, preparation of modified polylactic acid by blending star-shaped multi-arm block polylactic acid and linear PLLA

[0074] 1. Preparation of linear PLLA matrix with a molecular weight of 500k

[0075] Under the protection of argon, add 0.0012g initiator ethylene glycol (Glycol), 10g L-lactide monomer (LLA), 0.005ml concentration in the dry 200ml reaction bottle successively and be 0.829mol / L stannous octoate ( SnOct 2 ) in toluene and 30ml of dry toluene. The reaction vial was sealed and placed in an oil bath at 120° C. for 90 h. It was then dissolved in dichloromethane, precipitated with methanol, washed three times, and dried in vacuo to obtain linear PLLA.

[0076] The molecular weight and molecular weight distribution of the prepared linear PLLA are shown in Table 1.

[0077] 2. Synthesis of star-shaped five-arm block PDLA (5a-PL, DLA100k-b-PDLA100k)

[0078] The branched block copolymers were synthesized by a two-step addition method. Under the prote...

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Abstract

The invention discloses a modified polyactic acid and a preparation method thereof. The modified polyactic acid provided by the invention consists of a linear poly-L-lactic acid (PLLA) and a poly-dextro-lactic acid (PDLA) with a branched structure, wherein the PDLA with the branched structure is at least one of a stellate branched PDLA, a pectinate branched PDLA, a block copolymer of the stellate branched PDLA and a racemic polyactic acid and a block copolymer of the pectinate branched PDLA and the racemic polyactic acid. The modified polyactic acid is prepared by mixing the linear PLLA and the branched PDLA. In the preparation method, the PDLAs with different branched structures are added into the linear PLLA in a certain ratio; and the PDLA and the PLLA form a stereo composite. The PLLA and the branched PDLA are connected with each other by stereo composite structures, so that a net-like structure taking branched points and the stereo composite as crosslinking points is formed in the modified polyactic acid, and an excellent mechanical property is provided for the modified polyactic acid.

Description

technical field [0001] The invention relates to a modified polylactic acid and a preparation method thereof. Background technique [0002] Plastic products are indispensable in people's daily life. In 2008, my country's plastic consumption exceeded 30 million tons, making it the second largest plastic consumer in the world. However, while traditional plastic products bring convenience to people, they also pollute the environment. Generally, plastics take hundreds of years or even longer to completely degrade, resulting in serious "white pollution". At the same time, traditional plastic raw materials are derived from non-renewable resources such as petroleum. With the depletion of petrochemical resources, the traditional plastic industry is also threatened. Therefore, vigorously developing environmentally friendly biodegradable polymers to replace petroleum-based plastic products has become a hot spot in current research and development. [0003] Among the currently develop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04
Inventor 甘志华解文媛
Owner INST OF CHEM CHINESE ACAD OF SCI
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