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Biodegradable polyester nanocomposite material containing functionalized starch nanocrystals and preparation method thereof

A technology of biodegradable polyester and nanocomposite materials, applied in the field of biodegradable polyester nanocomposite materials

Active Publication Date: 2016-01-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses functionalized starch nanocrystals with different surface properties in biodegradable polyesters to prepare biodegradable polyester nanocomposites containing functionalized starch nanocrystals. The biodegradable polyester nanocomposites have Gas barrier properties, controllable degradation properties, and low surface energy graft chains containing fluorine and silicon migrate to the surface of the substrate, etc., so far, there are no relevant literature reports at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Graft polystyrene starch nanocrystals (grafting rate is 0.05, that is, the amount (molar) ratio of grafted styrene monomers to starch glucose units, particle size is 50-150nm, starch is industrial Corn starch) was pre-dispersed in polylactic acid chloroform solution, stirred evenly, and dried to prepare a composite masterbatch of polystyrene grafted starch nanocrystals and polylactic acid, wherein the amount of polystyrene grafted starch nanocrystals was poly 20% by dry weight of lactic acid;

[0028] (2) Mix the polystyrene grafted starch nanocrystals obtained in step (1) with the composite masterbatch of polylactic acid and polylactic acid particles, wherein the polystyrene grafted starch nanocrystals are polylactic acid (step (1) 1% of the total dry weight of (added in step (2)); at a temperature of 90-190°C, a biodegradable polylactic acid nanocomposite material containing polystyrene grafted starch nanocrystals is prepared through an extruder;

[0029] (3) The...

Embodiment 2

[0031] Basically the same as Example 1, except that polystyrene grafted starch nanocrystals (grafting rate is 0.15, i.e. the amount (molar) ratio of grafted styrene monomer to starch glucose unit, particle diameter is 50~ 150nm, starch is cornstarch for industrial use) is 3% of the total dry weight of polylactic acid (added in step (1) and step (2), and is hot-pressed to obtain polystyrene-grafted starch nanocrystals Thin slice sample of biodegradable polylactic acid nanocomposite, numbered PStN-PLA-2.

Embodiment 3

[0033] Basically the same as Example 1, except that polystyrene grafted starch nanocrystals (grafting ratio is 0.45, i.e. the amount (molar) ratio of the grafted styrene monomer to the starch glucose unit, the particle diameter is 50~ 150nm, starch is cornstarch for industrial use) is 5% of the total dry weight of polylactic acid (added in step (1) and step (2), and is hot-pressed to obtain polystyrene-grafted starch nanocrystals Thin slice sample of biodegradable polylactic acid nanocomposite, numbered PStN-PLA-3.

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Abstract

The invention relates to a biodegradable polyester nanocomposite material, and particularly relates to a biodegradable polyester nanocomposite material containing functionalized starch nanocrystal and preparation method of the biodegradable polyester nanocomposite material. The biodegradable polyester nanocomposite material containing functionalized starch nanocrystal is prepared by blending compound master batch of functionalized starch nanocrystal and a polymer with biodegradable polyester granules; the functionalized starch nanocrystal in the biodegradable polyester nanocomposite material is 20-60% of dry weight of the polymer, and is 1%-15% of the total dry weight of the biodegradable polyester and the polymer. The functionalization of the biodegradable polyester nanocomposite material is realized, the prepared biodegradable polyester nanocomposite material containing functionalized starch nanocrystal is an environment-friendly material and has gas barrier property, controllable degradability, as well as a function that fluorine, silicon-containing low surface energy grafted chain is capable of migrating to matrix surface.

Description

technical field [0001] The invention relates to a biodegradable polyester nanocomposite material, in particular to a biodegradable polyester nanocomposite material containing functionalized starch nanocrystals and a preparation method thereof. Background technique [0002] Starch is a renewable and abundant polysaccharide natural polymer in nature. Depending on the type of starch, natural starch has a particle size of about 5 to 100 microns, and starch with such a particle size only acts as a filler in the material, which is not conducive to the application of starch products. And the starch whose particle size is less than 1 micron can show a good reinforcing effect. Nanostarch (including starch nanocrystals) has a very fine microscopic scale. At present, there are a few patents at home and abroad, such as US6677386 (2004), US6921430 (2005), etc., using gel crosslinking-hot water dispersion method, acid hydrolysis method, etc. to prepare starch nano (including starch nano...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L67/02C08L87/00C08L3/04C08L51/02C08J3/22
Inventor 王才潘则林赵萍吴美琰
Owner INST OF CHEM CHINESE ACAD OF SCI
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