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Fully biodegradable nano-starch graft polylactic acid

A nano-starch and biodegradation technology, which is applied in the field of preparation of nano-starch-based polymers, can solve the problems of poor hydrophilicity and reduced biocompatibility, and achieve the effects of improving compatibility, wide application prospects, and solving white pollution

Inactive Publication Date: 2011-10-26
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, the disadvantages of polylactic acid are: poor hydrophilicity, which reduces its biocompatibility with other substances
[0004] So far, there is no report on the synthesis of nano-starch-g-polylactic acid by click chemistry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Preparation of alkynyl-terminated polylactic acid

[0022] Dissolve 7.4930g lactide in 80ml toluene, add 0.2888ml propynol, add 1.3053ml stannous octoate, oil bath at 120℃, react for 24h, settle with 400ml ethanol, filter, wash with ethanol three times, and vacuum dry for 24h to obtain Alkynyl-terminated polylactic acid with a molecular weight of 1500.

Embodiment 2

[0023] Example 2: Preparation of alkynyl-terminated polylactic acid

[0024] Dissolve 6.1862g lactide in 70ml toluene, add 0.1191ml propynol, add 1.0776ml stannous octoate, oil bath at 120°C, react for 24h, settle with 400ml ethanol, filter, wash three times with ethanol, and vacuum dry for 24h to obtain Alkynyl-terminated polylactic acid with a molecular weight of 3000.

Embodiment 3

[0025] Example 3: Preparation of alkynyl-terminated polylactic acid

[0026] Dissolve 2.89g lactide in 10ml toluene, add 0.0167ml propynol, add 0.5034ml stannous octoate, oil bath 120℃, react for 24h, settle with 100ml ethanol, filter, wash with ethanol three times, vacuum dry for 24h to obtain Alkynyl-terminated polylactic acid with a molecular weight of 10,000.

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PUM

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Abstract

Belonging to the technological field of preparation of fully biodegradable nano-starch based graft copolymer, the invention provides a method for preparing completely biodegradable nano-starch graft polylactic acid copolymer by a click chemistry method. The nano-starch based graft copolymer is prepared by the steps of: subjecting hydroxy functional groups with reactivity in nano-starch to a chemical reaction and introducing azide groups, and performing an azide-alkynyl Husigen cycloaddition reaction with polylactic acid of a triplebond end group. The nano-starch-polylactic acid graft copolymer is prepared through the click chemistry method, and is characterized by high-efficient and controllable reaction, clear and controllable polylactic acid molecular weight and grafting rate, clear copolymer structure, reduced hydrophily of starch, and excellent plasticity and processability.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of nanometer starch-based polymers that can be completely biodegradable. technical background: [0002] Click chemistry was proposed by the American chemist Sharpless. It is a new method for the rapid synthesis of a large number of compounds. The main purpose is to quickly and reliably complete the chemical synthesis of various molecules through the splicing of small units. In this way, molecular diversity can be obtained simply and efficiently. The concept of click chemistry has made a great contribution to the field of chemical synthesis. In many fields such as drug development and biomedical materials, it has become one of the most useful and attractive synthesis concepts. [0003] Starch is an important renewable and biodegradable natural polymer material. It is very important in the food industry and other practical applications and is used in large quantities. The source of starch is abundan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G63/91C08G63/08C08B31/00
Inventor 陈莉单红玲张喆孙静茹庄秀丽陈学思
Owner NORTHEAST NORMAL UNIVERSITY
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