Cellulose derivative grafted copolymer and its synthesis method

A technology of cellulose derivatives and graft copolymers, which is applied in the field of cellulose derivatives graft copolymers and their synthesis, and can solve problems such as high flow temperature and processing performance limitations

Inactive Publication Date: 2003-03-26
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials have high flow temperatures, resulting in limited processability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 3.44 grams of polycaprolactone monoacrylate with a molecular weight of 344 were dissolved in 17 milliliters of acetone, and 1.74 grams of 2,4-toluene diisocyanate was added. After reacting for 2.5 hours under reflux conditions, the terminal isocyanate was obtained by precipitation in petroleum ether. thing. 17.22 grams of cellulose diacetate with a number-average molecular weight of 60,000 were dissolved in 180 milliliters of acetone, and the isocyanate-terminated prepolymer was added, and reacted for 8 hours under reflux conditions. After the acetone was volatilized and extracted for 24 hours, 22.00 grams of CDA was obtained. - g-PCLA graft copolymer. Grafting rate is 27.76%, W PCLA was 13.82%. The apparent flow temperature of CDA-g-PCLA is 208-210°C, which is about 37°C lower than the apparent flow temperature of cellulose diacetate (245-250°C). The viscous flow temperature of CDA-g-PCLA is 209.40℃, which is 36.05℃ lower than that of cellulose diacetate (245.45℃). ...

Embodiment 2

[0029] 5.72 grams of polycaprolactone monoacrylate with a molecular weight of 572 were dissolved in 29 milliliters of acetone, 2.50 grams of 4,4'-diphenylmethane diisocyanate was added, and after 3 hours of reaction under reflux conditions, the terminal isocyanate was obtained by precipitation in petroleum ether. Polymer. 12.30 grams of cellulose diacetate with a number-average molecular weight of 78,000 were dissolved in 130 milliliters of acetone, and an isocyanate-terminated prepolymer was added, and reacted for 10 hours under reflux conditions. After volatilization and removal of acetone, 19.10 grams of CDA were obtained after extraction with toluene for 24 hours. - g-PCLA graft copolymer. The grafting rate is 55.28%, W PCLA was 22.51%. The apparent flow temperature of CDA-g-PCLA is 210-212°C, which is about 37°C lower than the apparent flow temperature of cellulose diacetate (247-249°C). The viscous flow temperature of CDA-g-PCLA is 209.47°C, which is 35.98°C lower tha...

Embodiment 3

[0031] 5.14 grams of polycaprolactone monoacrylate with a molecular weight of 1028 were dissolved in 26 milliliters of acetone, and 0.93 grams of 1,6-hexamethylene diisocyanate was added. After reacting for 4 hours under reflux conditions, the terminal isocyanate was obtained by precipitation in petroleum ether. Polymer. 7.38 grams of cellulose acetate with a number-average molecular weight of 94,000 were dissolved in 75 milliliters of acetone, added with an isocyanate-terminated prepolymer, and reacted for 11 hours under reflux conditions. After removing the acetone by volatilization, 12.03 grams of CDA- g-PCLA graft copolymer. Grafting rate is 63.01%, W PCLA was 30.92%. The apparent flow temperature of CDA-g-PCLA is 196-198°C, which is about 52°C lower than the apparent flow temperature of cellulose diacetate (248-250°C). The viscous flow temperature of CDA-g-PCLA is 193.70℃, which is 51.75℃ lower than the viscous flow temperature of cellulose diacetate (245.45℃). The we...

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Abstract

The invention refers to a kind of fibrin derivative graft polymer and the synthesis method. The graft polymer is of fibrin derivative and poly hexyl lactone single propenoic acid ester, the graft rate is 10-80%. The method includes: poly hexyl lactone single propenoic acid ester whose molecular weight is 2300-1500 and di-isocyanate react in acetone medium for 2.5-5 hours according to the mol ratio of 1:0.95-1.50, the end isocyanate prepolymer is obtained after they are post processed; and isocyanate prepolymer andfibrin ramification react in organic solvent medium for 8-12 hours according to the weight proportion of 1:1-5, the graft polymer is obtained after the post processing.

Description

technical field [0001] The invention relates to a cellulose derivative graft copolymer and a synthesis method thereof. technical background [0002] Cellulosic material is a biodegradable organic material that can be degraded by microorganisms in the natural environment. Cellulose derivatives, such as cellulose diacetate (CDA), ethyl cellulose, etc. are important cellulose derivatives, which are widely used in textiles, membrane separation, plastics, filter materials, membranes and coatings. However, these materials have high flow temperatures, resulting in limited processability. [0003] In order to reduce the flow temperature of cellulose derivatives, the traditional external plasticization method is limited in application because of the exudation of plasticizer and the problems of decomposition. Graft modification of cellulose derivatives has become One method of lowering flow temperature (Yoshioka M et al, Cellulose, 1999, 6: 193-212). For example,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00
Inventor 王东山宣英男黄勇
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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