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Method for Improving the Compatibility of Cellulose Nanocrystals and Aliphatic Polyester with Phthalic Anhydride

A technology of phthalic anhydride and aliphatic polyester, which is applied in the field of environment-friendly materials and bio-nano composite materials, can solve problems such as damage, molecular chain breakage, and sample performance degradation, and achieve simple process, lower surface energy, and material The effect of cost reduction

Active Publication Date: 2016-08-24
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong oxidative properties of peroxides such as DCP and BPO, maleic anhydride severely damages the -C-C- bond of aliphatic polyester, and easily causes molecular chain breakage, which reduces the performance of the sample (Jiu Yongbin , Yao Weishang, Wang Xiaoqing, etal. Effect of PBS-g-MAH and MAH on the mechanical properties of PBS / starch alloy [J]. New Chemical Materials, 2006, 04): 37-40.)

Method used

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  • Method for Improving the Compatibility of Cellulose Nanocrystals and Aliphatic Polyester with Phthalic Anhydride
  • Method for Improving the Compatibility of Cellulose Nanocrystals and Aliphatic Polyester with Phthalic Anhydride
  • Method for Improving the Compatibility of Cellulose Nanocrystals and Aliphatic Polyester with Phthalic Anhydride

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This example is aimed at the method of improving the compatibility between CNs and PBS by phthalic anhydride.

[0027] Commercial microcrystalline cellulose was treated in a sulfuric acid solution with a concentration of 4 mol / L, and heated in an oil bath at 70°C for 4 hours. Then wash the nanocrystals obtained by acid hydrolysis with deionized water until the supernatant of the suspension is neutral, then adjust the CNs suspension with 1mol / L ammonia solution to adjust the pH value to 7, and finally place the suspension in freeze-drying In a machine, freeze-dry to obtain CNs bodies with a diameter of 70-100nm and a length of 6-10μm; 0.1wt% acid anhydride is blended with PBS by a twin-screw melting method, and the processing temperature is 125-130°C. The torque was 2-6N×m, and the blending time was 5min; 0.1wt% CNs was melt-blended with the modified PBS in the same process to obtain the final sample.

[0028] The Young's modulus of the sample in this embodiment is 123M...

Embodiment 2

[0030] This example is aimed at the method of improving the compatibility between CNs and PBS by phthalic anhydride.

[0031] Commercial microcrystalline cellulose was treated in a sulfuric acid solution with a concentration of 9 mol / L, and heated in an oil bath at 90°C for 1 h. Then wash the nanocrystals obtained by acid hydrolysis with deionized water until the supernatant of the suspension is neutral, then adjust the CNs suspension with 4mol / L ammonia solution to adjust the pH value to 7, and finally place the suspension in freeze-drying In a machine, freeze-dry to obtain CNs bodies with a diameter of 50-70nm and a length of 1-4μm; 2wt% phthalic anhydride is blended with PBS by a twin-screw melting method, and the processing temperature is 120-125°C. The torque was 2-10N×m, and the blending time was 5min; 50wt% CNs was melt-blended with the modified PBS in the same process to obtain the final sample.

[0032] The Young's modulus of the sample in this embodiment is 290MPa, ...

Embodiment 3

[0034] This example is aimed at the method of improving the compatibility between CNs and PBSA by phthalic anhydride. Such as figure 1 Shown is the schematic diagram of the reaction of phthalic anhydride on the interface modification of aliphatic polyester and cellulose.

[0035]Commercial microcrystalline cellulose was treated in a sulfuric acid solution with a concentration of 6 mol / L, and heated in an oil bath at 70°C for 4 hours. Then wash the nanocrystals obtained by acid hydrolysis with deionized water until the supernatant of the suspension is neutral, then adjust the CNs suspension with 2mol / L ammonia solution, adjust the pH value to 7, and finally place the suspension in freeze-drying In a machine, freeze-dry to obtain CNs bodies with a diameter of 60-100nm and a length of 1-4μm; 1wt% phthalic anhydride is blended with PBSA by a twin-screw melting method, and the processing temperature is 110-115°C. The torque was 2-10N×m, and the blending time was 5min; 10wt% CNs w...

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Abstract

The invention relates to a method for improving the compatibility of cellulose nanocrystals and aliphatic polyesters with phthalic anhydride, comprising the following steps: (1) adding cellulose microcrystals to a sulfuric acid solution, under constant temperature conditions in an oil bath Continue to stir and decompose, wash the obtained nanocrystals with deionized water until neutral, adjust the pH value of the cellulose nanocrystal suspension to 7 with lye; (2) melt and co-polymerize phthalic anhydride and aliphatic polyester (3) melting and blending 0.1 to 50 wt% of cellulose nanocrystals and modified aliphatic polyester. Compared with the prior art, due to the binding effect of phthalic anhydride, the compatibility between cellulose and aliphatic polyester is obviously improved, and the mechanical properties are effectively improved. At the same time, the invention has simple process and wide sources of materials. Due to the introduction of a large amount of cellulose filler, the cost of materials is greatly reduced, and the biodegradability is further deepened, so it has strong industrial application value.

Description

technical field [0001] The invention belongs to the field of biological nanocomposite materials, and also belongs to the field of environment-friendly materials, in particular to a method for improving the compatibility of cellulose nanocrystals and aliphatic polyesters with phthalic anhydride. Background technique [0002] Cellulose is the polymer material with the largest content in nature, and the cellulose microcrystals processed from natural cellulose have been widely used in food, medicine, cosmetics and paint stabilizers (such as CN101481424A; CN1448427A; CN1340651A), plastics and In the production of rubber filler (such as CN1369508A; CN1340651A) and synthetic leather (such as CN101070352A; CN1220271A). However, due to the large size of cellulose crystallites, it cannot be well dispersed in the product, so its nanocrystals have good mechanical properties (Young's modulus and tensile strength can reach 150GPa and 250MPa respectively), biocompatibility The characteris...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L1/02C08K5/09C08B15/00
Inventor 张须臻张勇罗煜邢潇
Owner SHANGHAI JIAOTONG UNIV