Process for preparing surface lactic acid graft modified starch and aliphatic polyester graft copolymer

A technology of aliphatic polyester and graft copolymer, which is applied in the field of preparation of surface lactic acid graft modified starch and aliphatic polyester graft copolymer, can solve the problem of complex graft copolymerization process of starch and aliphatic polyester, Low grafting rate and other problems, to achieve the effect of plasticity and processability, high grafting rate and good compatibility

Inactive Publication Date: 2005-11-09
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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AI Technical Summary

Problems solved by technology

[0004] In order to solve technical problems such as complex graft copolymerization process of starch and aliphatic polyester and low grafting rate, the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Preparation of lactic acid surface modified starch. In the reaction flask, disperse 15g of starch in 80ml of tetrahydrofuran solvent, slowly add 1.5ml, 3ml, 15ml, and 30ml of lactic acid dropwise at room temperature and under stirring conditions, and wait for the lactic acid to be completely added. The reaction was stirred at 70° C. for 3 hours, and then 200 ml of toluene was added and the reaction was continued for 2, 8 and 18 hours under azeotropic dehydration conditions. The product was alternately washed five times with tetrahydrofuran and ethanol to remove unreacted lactic acid, and dried in vacuum at 40°C for 48 hours to obtain lactic acid surface-modified starch. Infrared spectroscopy can verify the chemical connection between lactic acid and starch granules, and the lactic acid load on starch obtained by starch weight gain method is shown in Table 1.

[0015]

Embodiment 2

[0017] In Example 1, the tetrahydrofuran solvent was replaced with dioxane, and the rest of the conditions were the same as in Example 1. The results of the content of lactic acid loaded on the starch surface are shown in Table 2.

[0018]

Embodiment 3

[0020] In embodiment 1, replace toluene dehydrating agent with dimethylbenzene, all the other conditions are with embodiment 1. The results of the content of lactic acid loaded on the starch surface are shown in Table 3.

[0021]

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Abstract

A process for preparing lactic acid graft modified starch and starch grafted aliphatic polyester copolymer includes such steps as adding starch and lactic acid to organic solvent, heating while stirring for dewatering-polycondensating reaction, dewatering it toluene or xylene while graft reaction between the hydroxy on the surface of starch and lactic acid to obtain starch lactate (or oligolactate), and open-loop copolymerizing between said product, stannous octoate as trigger and epsilon-caprolactone or lactide. Its advantages are full biodegradability, high plasticity and machinability and high resistance to acid, alkali, and water.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of fully biodegradable surface lactic acid graft modified starch and aliphatic polyester graft copolymer. technical background: [0002] Aliphatic polyesters, such as polylactide (PLA), polyε-caprolactone (PCL), and polyglycolide (PGA), are currently a class of fully biodegradable materials that are widely used. Aliphatic polyester has low immunity and good biodegradability, biocompatibility and mechanical strength, so it is widely used in biomedical and medical fields, such as: fracture fixation materials, surgical sutures, tissue engineering scaffold materials, drugs Sustained-release carrier materials, etc. But at present, it is expensive and has not been widely used for the time being. [0003] Starch is the storage form of carbohydrates in green plants. It is an important renewable and biodegradable natural resource. It is very important and used in large quantities in the food industr...

Claims

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Application Information

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IPC IPC(8): C08G81/00
Inventor 陈学思陈莉景遐斌邱雪宇洪重奎庄秀丽
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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