A kind of cellulose nanocrystal composite material and method modified by polylactic acid/nucleating agent

A technology of composite materials and cellulose, which is applied in the field of composite materials and their preparation, can solve problems such as unfavorable industrial production and complex chemical modification process, and achieve the effects of high crystallinity, improved mechanical properties, and improved thermal deformation resistance

Active Publication Date: 2021-07-27
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of chemical modification is complicated, which is not conducive to industrial production

Method used

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  • A kind of cellulose nanocrystal composite material and method modified by polylactic acid/nucleating agent
  • A kind of cellulose nanocrystal composite material and method modified by polylactic acid/nucleating agent
  • A kind of cellulose nanocrystal composite material and method modified by polylactic acid/nucleating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Modification of cellulose nanocrystals

[0036] Weigh 75 parts by weight of cellulose nanocrystals and 25 parts by weight of N,N'-ethylene bisstearamide, ultrasonically disperse the two in DMSO for 60 minutes, filter with suction, put the product in an oven, and dry at 60°C 8 hours; Take out and grind, obtain the cellulose nanocrystal (mCNCs) of nucleating agent modification;

[0037] Step 2: Preparation of PLA / mCNCs composites

[0038] Weigh a certain amount of polylactic acid (2003D), weigh the modified cellulose according to 2% of the mass of polylactic acid, premix it in a high-speed premixer, and then add it to a twin-screw extruder for blending to prepare polylactic acid / mCNCs composite material.

[0039] Get embodiment 1 part composite material sample and adopt WAXD to detect the crystallinity of composite material, all the other samples are injection molded into standard test specimen in injection molding machine, and carry out tensile strength, elonga...

Embodiment 2

[0041]The modification of cellulose nanocrystals in Example 2 is the same as in Example 1, except that when preparing the polylactic acid / mCNCs composite material, the mass ratio of polylactic acid and modified cellulose is 1:0.03.

[0042] Get embodiment 2 part composite material sample and adopt WAXD to detect the crystallinity of composite material, all the other samples are injection molded into standard test sample bar in injection molding machine, and carry out tensile strength, elongation at break, Charpy notched impact strength detection respectively, The results are shown in Table 1.

Embodiment 3

[0044] Step 1: Modification of cellulose nanocrystals

[0045] Weigh 50 parts by weight of cellulose nanocrystals and 50 parts by weight of dibenzohydrazide sebacic acid, ultrasonically disperse the two in DMF for 60 minutes, filter with suction, put the product in an oven, and dry at 60°C for 12 hours; Take out and grind to obtain cellulose nanocrystals (mCNCs) modified by nucleating agent;

[0046] Step 2: Preparation of PLA / mCNCs composites

[0047] Weigh a certain amount of polylactic acid (2003D), weigh the modified cellulose according to 1% of the mass of polylactic acid, premix it in a high-speed premixer, and then add it to a twin-screw extruder for blending to prepare polylactic acid / mCNCs composite material.

[0048] Get embodiment 3 part composite material sample and adopt WAXD to detect the crystallinity of composite material, all the other samples are injection molded into standard test sample in injection molding machine, and carry out tensile strength, elongat...

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Abstract

The invention discloses a polylactic acid / nucleating agent-modified cellulose nanocrystal composite material and a method, which is characterized in that the cellulose nanocrystal is modified by a polyamide nucleating agent with self-assembly ability , obtain needle-like or rod-like self-assembled structure of modified cellulose nanocrystals, and then compound with polylactic acid to obtain polylactic acid / cellulose interface structure with string crystal morphology. The present invention selects a nucleating agent with self-assembly ability, which can form rod-like, needle-like structures, etc., and forms a hydrogen bond with the hydroxyl group of the cellulose and the amino group of the nucleating agent, thereby realizing the adsorption of the nucleating agent on the surface of the cellulose. It will cause the destruction of the cellulose structure, thereby retaining the excellent properties of cellulose to the greatest extent.

Description

technical field [0001] The invention relates to a composite material and a preparation method thereof, in particular to a composite material and a preparation method for enhancing the interface between cellulose nanocrystals and polylactic acid composite materials through self-assembly of a nucleating agent on the surface of cellulose, and belongs to polymer materials field. Background technique [0002] At present, the shocking white pollution makes the development of degradable polymers more urgent. Among them, biodegradable polylactic acid (PLA), which uses bio-fermented lactic acid as a raw material, is a renewable and environmentally friendly polymer material. However, due to the slow crystallization rate of PLA, the heat resistance of its products is poor (heat distortion temperature is lower than 60°C). In addition, the molecular chains of the material itself are closely combined, resulting in very poor toughness, and the notched impact strength is only 3KJ / m 2 lef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L1/02C08K5/20C08K5/25
CPCC08L67/04C08L2201/08C08L2205/24C08L1/02C08K5/20C08K5/25
Inventor 赵丽芬魏亚菲秦升学胡亚男田阳刘威志
Owner SHANDONG UNIV OF SCI & TECH
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