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Half interpenetration polymer network materal and preparation process and application thereof

A polymer and semi-interpenetrating technology, applied in the field of natural polymer chemistry and functional polymers, can solve the problems of high price, poor compatibility, and restrictions, and achieve environmental protection, excellent performance, and improved mechanical and optical properties Effect

Inactive Publication Date: 2005-01-05
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Blend starch directly with degradable synthetic polymer polylactic acid and polycaprolactone to obtain a series of fully biodegradable materials with better performance (Polymer Communication, 41, 3875, 2000; Polymer, 43, 5935, 2002) , but its expensive, so the application is limited
In addition, the high hydrophilicity of starch makes it poorly compatible with synthetic polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 20 grams of cornstarch and 200 grams of distilled water were mixed, stirred at room temperature for 3 minutes, and then 100 grams of 35 wt% NaOH aqueous solution was added, and the temperature was gradually raised to 40° C. and maintained for 15 minutes. Then 50 g of benzyl chloride was added within 15 minutes, and the temperature was raised to 95° C. within 8 minutes, and the reaction was maintained for 1 hour to obtain a white sticky solid. The white solid was washed alternately with acetone and distilled water for more than 5 times to obtain a white powder. Vacuum drying at room temperature to obtain the final product - benzyl starch. The degree of substitution is 0.88 and the weight average molecular weight is 1.69×10 measured by elemental analysis and GPC-light scattering. 7 . The product was a white water-insoluble powder weighing 18.2 g. Soluble in N,N-dimethylformamide.

[0015] Add castor oil dropwise to molten 4,4-diphenylmethane diisocyanate at 40°C accor...

Embodiment 2

[0017] 20 grams of cornstarch and 200 grams of distilled water were mixed, stirred at room temperature for 5 minutes, and then 100 grams of 35 wt% NaOH aqueous solution was added, and the temperature was gradually raised to 40° C. and maintained for 30 minutes. Then 50 g of benzyl chloride was added within 15 minutes, and the temperature was raised to 98° C. within 5 minutes, and the reaction was maintained for 1.5 hours to obtain a white sticky solid. The white solid was washed alternately with acetone and distilled water for more than 5 times to obtain a white powder. Vacuum drying at room temperature to obtain the final product - benzyl starch. The degree of substitution is 1.4 and the weight average molecular weight is 1.51×10 as measured by elemental analysis and GPC-light scattering. 7 . The product was a white water-insoluble powder weighing 17.2 g. Soluble in N,N-dimethylformamide.

[0018] Add castor oil dropwise to molten 4,4-diphenylmethane diisocyanate at 50°C ...

Embodiment 3

[0020] The whole preparation process is the same as that in Example 1, except that the amounts of prepolymer, benzyl starch and 1,4-butanediol are respectively changed to 3.50 g, 0.94 g and 0.240 g, and the total solid content is adjusted to 20%. Naturally solidified at 80°C for 4 hours to obtain a semi-interpenetrating polymer network material containing 20% ​​benzyl starch. See attached table 1 for its mechanical properties and light transmittance.

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Abstract

The invention discloses a benzyl starch-castor oil-based polyurethane semi-interpenetrating polymer network material and its preparing method and application, blending castor oil-based polyurethane prepolymer, benzyl starch and 1, 4-butanediol in N, N-dimethyl formylamine to react, then solidifying without adding in solidifying agent at 50-80 deg.C for 4-12 hours and obtaining the product. The new material has good mechanical property, excellent photopermeability and biodegradability as well as simple and convenient producing course. It can act as biodegradable material for paints, apparatuses and films, and has application prospect in the fields of medicine, commodity, chemical industry and environmental protection.

Description

technical field [0001] The invention relates to a preparation method and application of a natural polymer semi-interpenetrating polymer network material, which is a functional material prepared from castor oil-based polyurethane and benzyl starch. It belongs to the field of functional polymers and also belongs to the field of natural polymer chemistry. Background technique [0002] After 50 years, petroleum resources will be gradually exhausted, and polymer materials based on petroleum products will face serious threats. At the same time, due to the serious pollution caused by the widespread use of synthetic polymer materials, the development and utilization of renewable resources - natural polymers have been paid more and more attention. Natural polysaccharides are environmentally friendly materials and renewable resources, and are expected to become important chemical raw materials in the future. Starch has attracted much attention due to its cheapness, renewable and bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L3/02C08L75/04
Inventor 张俐娜曹晓东
Owner WUHAN UNIV
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