Nano particle grafted stereoblock polylactic acid, preparation method and application of nano particle grafted stereoblock polylactic acid

A nanoparticle and stereoblock technology, applied in the fields of nanomaterials and physical chemistry, can solve the problems of poor thermal stability, coexistence, unfavorable material processing and molding, etc. Efficiency and effect of melt stability

Active Publication Date: 2016-06-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal stability of the linear sb-PLA stereocomplex is not good, and sc-PLA crystals and homopolymer crystals tend to coexist during the crystallization-melting-recrystallization process, which is not conducive to the processing and molding of materials. Compared with sb-PLA, the sc formed by PLLA and PDLA stereoblock copolymers with more than 13 arms after multiple crystallization-melt-recrystallization processes, the material only generates sc

Method used

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  • Nano particle grafted stereoblock polylactic acid, preparation method and application of nano particle grafted stereoblock polylactic acid
  • Nano particle grafted stereoblock polylactic acid, preparation method and application of nano particle grafted stereoblock polylactic acid
  • Nano particle grafted stereoblock polylactic acid, preparation method and application of nano particle grafted stereoblock polylactic acid

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Experimental program
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Effect test

Embodiment 1

[0027] Step 1. Use 0.1g surface-OHized multi-walled carbon nanotubes (CNT) as initiator and 2ml Sn(Oct) with a concentration of 0.05g / ml 2 The toluene solution is the catalyst, and 200ml toluene is the solvent. It catalyzes the ring-opening polymerization of 40g L-lactide at 125°C for 24h, flocculates several times to obtain CNT-g-PLLA, and fully vacuum-drys to obtain about 20g sample;

[0028] Step 2. Using 15g of CNT-g-PLLA obtained in step 1 as initiator, 1ml of Sn(Oct)2 in toluene solution with a concentration of 0.05g / ml as catalyst, 200ml of toluene as solvent, catalyzing 15g of dextro-lactide Perform ring-opening polymerization at 125°C for 24 hours, flocculate several times to obtain CNT-g-PLLA-PDLA, and fully vacuum dry to obtain about 20g sample;

[0029] Step 3. Dissolve 1 g of the sample obtained in Step 2 in 50 ml of a mixed solvent of dichloromethane containing 10% hexafluoroisopropanol, stir vigorously for 3 hours, cast into a thin sheet of about 0.1 mm, and fully vac...

Embodiment 2

[0032] According to the same method in Example 1, the surface of nano-silica was grafted with stereoblock polylactic acid——SiO 2 -g-PLLA-PDLA, and perform the same experimental procedure.

Embodiment 3

[0034] According to the same method in Example 1, the graphene surface grafted stereo block polylactic acid-GO-g-PLLA-PDLA was prepared, and the same experimental procedure was performed.

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Abstract

The invention discloses a preparation method of nano particle grafted stereoblock polylactic acid. The method comprises the following steps that 1, under the anhydrous condition and protection of inert gas, nano particles with active groups on the surface are adopted as an initiator, metal carboxylate or metal alkoxide is adopted as a catalyst, levogyration or dextrorotation lactide is catalyzed to be subjected to ring opening polymerization at low temperature in an organic solvent, and nano particle grafted polylactic acid is obtained; 2, under the anhydrous condition and protection of inert gas, the obtained product is dissolved in an organic solvent, metal carboxylate or metal alkoxide is added for an activating reaction, and a high-activity polymer end-capped by specific functional groups is obtained; 3, the high-activity polymer is subjected to a ring-opening polymerization reaction with levogyration or dextrorotation lactide in an organic solvent, and nano particle grafted stereoblock copolymer is obtained. The invention further discloses the nano particle grafted stereoblock polylactic acid and application thereof. The preparation method is simple in process and easy to operate, and has industrial potential.

Description

Technical field [0001] The invention relates to a stereoblock copolymer and a preparation method thereof, in particular to a nanoparticle grafted stereoblock polylactic acid and a preparation method thereof, and belongs to the technical field of nanomaterials and physical chemistry. The invention also relates to nanoparticle The blending of grafted stereoblock polylactic acid and linear PLA promotes the application of stereocomplex crystallization. Background technique [0002] With the depletion of petroleum resources and severe environmental pollution problems, sustainable biodegradable polymer materials that use biomass and natural resources as raw materials have become a research and application development direction that the world is paying attention to. Polylactic acid (PLA) is currently the most widely used variety of biodegradable polymer materials, and will gradually replace polyolefins in general plastics. In addition to its renewable and degradable properties, polylac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C08G63/08
CPCC08G63/08C08G83/00C08G83/001
Inventor 杨伟曹志强孙小蓉包睿莹谢邦互杨鸣波
Owner SICHUAN UNIV
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