CN114621418A - Preparation method of polylactic acid and graphene oxide composite material - Google Patents
Preparation method of polylactic acid and graphene oxide composite material Download PDFInfo
- Publication number
- CN114621418A CN114621418A CN202011453537.5A CN202011453537A CN114621418A CN 114621418 A CN114621418 A CN 114621418A CN 202011453537 A CN202011453537 A CN 202011453537A CN 114621418 A CN114621418 A CN 114621418A
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- Prior art keywords
- graphene oxide
- composite material
- polylactic acid
- graphene
- nanosheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
- C08G63/08—Lactones or lactides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/042—Graphene or derivatives, e.g. graphene oxides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention relates to a preparation method of a polylactic acid and graphene oxide composite material. The method is characterized in that: the invention relates to the technical field of preparation of polylactic acid and graphene oxide composite materials, in particular to a method for preparing polylactic acid and graphene oxide through a step-by-step growth polycondensation reaction.
Description
Technical Field
The invention relates to the technical field of preparation of polylactic acid and graphene oxide composite materials, in particular to a method for preparing polylactic acid and graphene oxide through a step-by-step growth polycondensation reaction.
Background
Graphene Oxide (GO) and reduced graphene oxide films also have great application prospects based on the special characteristics of graphene. The polylactic acid composite material is prepared by taking L-lactic acid and graphene oxide nanosheets as materials through in-situ melt polycondensation in the process. With the increase of the content of GO nano-sheets, the weight average molecular weight and the number average molecular weight of the composite material are reduced; the addition of GO nanosheets has no obvious influence on the chemical structure of PLA; there is also a strong interaction between the GO and PLA interfaces. Part of graphene oxide is reduced to graphene in the course of melt polymerization from oligomers to polymers. Wherein some of the defective crystals are converted to more stable crystals during the melting process. The GO nano-sheets can enable the composite material to crystallize under the condition of low temperature, because the GO nano-sheets have the function of a nucleating agent in the polymer, and the higher the content of the GO nano-sheets is, the higher the crystallinity of the composite material is.
Disclosure of Invention
The invention aims to provide a preparation method of a polylactic acid and graphene oxide composite material.
The technical scheme adopted by the invention is as follows:
graphene Oxide (GO) and reduced graphene oxide films also have great application prospects based on the special characteristics of graphene. The polylactic acid composite material is prepared by taking L-lactic acid and graphene oxide nanosheets as materials through in-situ melt polycondensation in the process. With the increase of the content of GO nano-sheets, the weight average molecular weight and the number average molecular weight of the composite material are reduced; the addition of GO nanosheets has no obvious influence on the chemical structure of PLA; there is also a strong interaction between the GO and PLA interfaces. Part of graphene oxide is reduced to graphene in the course of melt polymerization from oligomers to polymers. Wherein some of the defective crystals are converted to more stable crystals during the melting process. The GO nano-sheets can enable the composite material to crystallize under the condition of low temperature, because the GO nano-sheets have the function of a nucleating agent in the polymer, and the higher the content of the GO nano-sheets is, the higher the crystallinity of the composite material is.
The main advantages of the invention are: the process is simple, the reaction temperature is low, and the reaction time is short; the product has high yield and high purity.
Detailed Description
In order to illustrate the features of the present invention in more detail, the present invention is further illustrated by the following specific examples, which are not intended to limit the scope of the present invention.
Example 1:
graphene Oxide (GO) and reduced graphene oxide films also have great application prospects based on the special characteristics of graphene. There are many ways to prepare graphene. Such as: thermal reduction, epitaxial growth, micro-mechanical lift-off, chemical reduction, etc., wherein the chemical reduction is the simplest and feasible, has low cost, can be prepared in large quantities, and is one of the useful ways to prepare graphene. And the surface of GO contains some common groups such as hydroxyl, carboxyl, epoxy and the like, which make it have great application prospect in many categories. These particular groups of graphene oxide make it readily soluble in water, constitute a uniform, stable solution, and do not precipitate over long periods of time.
Example 2:
the polylactic acid composite material is prepared by taking L-lactic acid and graphene oxide nanosheets as materials through a process in-situ melt polycondensation mode. With the increase of the content of GO nano-sheets, the weight average molecular weight and the number average molecular weight of the composite material are reduced; the addition of GO nanosheets has no obvious influence on the chemical structure of PLA; there is also a strong interaction between the GO and PLA interfaces. And the results also indicate that part of the graphene oxide is reduced to graphene in the process of melt polymerization from oligomers to polymers.
Claims (1)
1. A preparation method of a polylactic acid and graphene oxide composite material is characterized by comprising the following steps:
the Graphene Oxide (GO) and reduced graphene oxide films have a great application prospect based on the special characteristics of graphene, and the polylactic acid composite material is prepared by taking L-lactic acid and graphene oxide nanosheets as materials through in-situ melt polycondensation in the process, so that the weight average molecular weight and the number average molecular weight of the composite material are reduced along with the increase of the content of the GO nanosheets; the addition of GO nanosheets has no obvious influence on the chemical structure of PLA; a strong interaction force also exists between GO and PLA interfaces, part of graphene oxide is reduced into graphene in the process of melt polymerization of oligomers into polymers, part of defective crystals are converted into more stable crystals in the melting process, and GO nano sheets can crystallize the composite material under the condition of low temperature because the GO nano sheets have the function of a nucleating agent in the polymer, and the higher the content of the GO nano sheets is, the higher the crystallinity of the composite material is.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011453537.5A CN114621418A (en) | 2020-12-12 | 2020-12-12 | Preparation method of polylactic acid and graphene oxide composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011453537.5A CN114621418A (en) | 2020-12-12 | 2020-12-12 | Preparation method of polylactic acid and graphene oxide composite material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114621418A true CN114621418A (en) | 2022-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011453537.5A Pending CN114621418A (en) | 2020-12-12 | 2020-12-12 | Preparation method of polylactic acid and graphene oxide composite material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114621418A (en) |
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2020
- 2020-12-12 CN CN202011453537.5A patent/CN114621418A/en active Pending
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