Polylactic acid/functional graphene composite material and preparation method thereof

A composite material, polylactic acid technology, applied in the field of polylactic acid/functionalized graphene composite material and its preparation, can solve the problems of insufficient elongation at break, poor compatibility, high brittleness of polylactic acid, etc., and achieve excellent thermal properties and mechanical properties, compatibility and wettability, and the effect of increasing interface strength

Active Publication Date: 2015-12-02
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the brittleness of polylactic acid is relatively large, the elongation at break is less than 10%, and the notched impact strength is less than 3kJ / m 2 , which greatly limits the application of polylactic acid in engineering
[0005] However, graphene has a large specific surface area and surface free energy. Under the condition of intermolecular interaction, the sheets are very easy to agglomerate, and its chemical activity is low. If it is directly mixed with polymers, it is easy to agglomerate, Poor compatibility and other reasons often fail to maximize the reinforcement effect on polymers

Method used

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  • Polylactic acid/functional graphene composite material and preparation method thereof
  • Polylactic acid/functional graphene composite material and preparation method thereof
  • Polylactic acid/functional graphene composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A polylactic acid / functionalized graphene composite material is prepared from graphene oxide, polylactic acid and didodecyldimethylammonium bromide, wherein the mass fraction of graphene oxide in the composite material is 0.1 %, and the mass ratio of graphene oxide to didodecyldimethylammonium bromide is 1.2:1.

[0035] The preparation method of this composite material comprises the following steps:

[0036] a) Take 240ml of graphene oxide aqueous solution with a concentration of 2mg / ml, add NaOH to adjust its pH to 9, and then add 80ml of dodecyldimethylammonium bromide with a concentration of 5mg / ml to obtain functionalized graphene Precipitate; then add 300ml trichloromethane wherein, after stirring for 10min, functionalized graphene can be seen to redisperse in the organic phase trichloromethane, after standing for stratification, take off the lower layer solution with separating funnel, obtain functionalized graphite Chloroform dispersion of alkenes;

[0037] b) ...

Embodiment 2

[0040] A polylactic acid / functionalized graphene composite material is prepared from graphene oxide, polylactic acid and didodecyldimethylammonium bromide, wherein the mass fraction of graphene oxide in the composite material is 0.2 %, and the mass ratio of graphene oxide to didodecyldimethylammonium bromide is 1.2:1.

[0041] The preparation method of this composite material comprises the following steps:

[0042]a) Take 720ml of graphene oxide aqueous solution with a concentration of 1mg / ml, add NaOH to adjust its pH to 9, and then add 120ml of dodecyldimethylammonium bromide with a concentration of 5mg / ml to obtain functionalized graphene Precipitate; then add 600ml dichloromethane wherein, after stirring for 10min, functionalized graphene can be seen to redisperse in the organic phase dichloromethane, after standing for stratification, take off the lower layer solution with separating funnel, obtain functionalized graphite Dichloromethane dispersion of alkenes;

[0043] ...

Embodiment 3

[0046] A polylactic acid / functionalized graphene composite material is prepared from graphene oxide, polylactic acid and didodecyldimethylammonium bromide, wherein the mass fraction of graphene oxide in the composite material is 0.3 %, and the mass ratio of graphene oxide to didodecyldimethylammonium bromide is 1.2:1.

[0047] The preparation method of this composite material comprises the following steps:

[0048] a) Take 240ml of graphene oxide aqueous solution with a concentration of 3mg / ml, add NaOH to adjust its pH to 9, and then add 120ml of dodecyldimethylammonium bromide with a concentration of 5mg / ml to obtain functionalized graphene Precipitate; then add 300ml trichloromethane wherein, after stirring for 10min, functionalized graphene can be seen to redisperse in the organic phase trichloromethane, after standing for stratification, take off the lower layer solution with separating funnel, obtain functionalized graphite Chloroform dispersion of alkenes;

[0049] b)...

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Abstract

The invention discloses a polylactic acid / functional graphene composite material, and belongs to the field of polymer composite materials. The composite material is prepared from oxidized graphene, polylactic acid and a surfactant. A preparation method of the composite material comprises the following steps: (a) under a stirring condition, sequentially adding the surfactant and an organic solvent into an oxidized graphene aqueous solution for standing, and separating out a subnatant solution, thereby obtaining an organic solution of functional graphene; (b) uniformly mixing the organic solution obtained in step (a) with a polylactic acid solution, and removing the solvent to obtain a super-tough master batch; (c) conducting melt mixing on the super-tough master batch and pure polylactic acid to obtain the polylactic acid / functional graphene composite material. The polylactic acid / functional graphene composite material has excellent thermal and mechanical properties, that is, the melt index, the tensile strength and the elongation at break are 7.3-11, 67-75 MPa and 34-159% respectively; the polylactic acid / functional graphene composite material is relatively high in toughness, and has much higher properties than polylactic acid.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a polylactic acid / functionalized graphene composite material and a preparation method thereof. Background technique [0002] Polylactic acid is a widely sourced, biodegradable, aliphatic polyester with good biocompatibility. It can be obtained from bio-renewable resources such as starch and sugar in corn and other plant stalks through bacterial fermentation to lactic acid, and then condensed by lactic acid. After use, its products can be finally degraded into clean water and carbon dioxide under the action of microorganisms in the soil, acid and alkali, etc. It is widely used in biomedicine, food packaging, agriculture, construction, disposable products, etc. It is an environmentally friendly Type green polymer materials. However, the brittleness of polylactic acid is relatively large, the elongation at break is less than 10%, and the notched impact streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K9/04C08K3/04C08J3/22C08J3/215
Inventor 陈金周张小瑞张丽牛明军郭凯朱婷班长伟
Owner ZHENGZHOU UNIV
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