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High-toughness polypropylene/polylactic acid ion grafted copolymer and preparation method thereof

A graft copolymer and ion grafting technology, which is applied in the field of olefin controllable polymerization technology and polyester synthesis, can solve the problem that the strength and heat resistance of plasticized polylactic acid materials cannot meet the requirements, and small molecule plasticizers are easy to migrate , practical value limitations and other issues, to achieve the effect of low cost, easy access to processing raw materials, and increased elongation at break

Active Publication Date: 2018-09-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PLA is inherently brittle, and its practical value is greatly limited in many fields, thus requiring toughening and modification
Chinese patent CN136189A grafts polyvinyl alcohol, acrylic acid, etc. into the main chain of polylactic acid, which obviously improves the flexibility of polylactic acid, but the process is complicated and the cost is high. Commercially, there are many examples of successfully improving the toughness of polylactic acid through copolymerization technology. few
However, small molecule plasticizers are easy to migrate, leading to material aging, and the strength and heat resistance of plasticized polylactic acid materials cannot meet the requirements in some application fields

Method used

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  • High-toughness polypropylene/polylactic acid ion grafted copolymer and preparation method thereof
  • High-toughness polypropylene/polylactic acid ion grafted copolymer and preparation method thereof
  • High-toughness polypropylene/polylactic acid ion grafted copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Synthesis of polylactic acid containing imidazole end groups: Dissolve L-lactic acid monomer and hydroxyethylimidazole in dichloroethane, the molar ratio of lactic acid monomer and hydroxyethylimidazole is 400:1, and then add 10uL N- Methyl-1,5,7-triazabicyclo[4,4,0]dec-5-ene (MTBD) was used as a catalyst and stirred at room temperature for 30 minutes to obtain polylactic acid with imidazole end groups.

[0030] 2) The preparation method of polypropylene / polylactic acid graft copolymer: in this step, the molar ratio of the iodine group of the olefin / undecene iodine copolymer to the imidazole group in the polyester end group is 1:1, 1g olefin / The undecyl iodine copolymer was dissolved in 50mL of toluene at 80°C to fully dissolve the polymer, and 1g of polyester containing terminal imidazole was added, and heated to reflux for 12h. The reacted solution was poured into ethanol for sedimentation, filtered, and then the ionomer was washed three times with ethanol and ace...

Embodiment 2

[0035] 1) Synthesis of polylactic acid containing imidazole end groups: Dissolve L-lactic acid monomer and hydroxyethylimidazole in dichloroethane, the molar ratio of lactic acid monomer and hydroxyethylimidazole is 200:1, and then add 8uL N- Methyl-1,5,7-triazabicyclo[4,4,0]dec-5-ene (MTBD) was used as a catalyst and stirred at room temperature for 20 minutes to obtain polylactic acid with imidazole end groups.

[0036] 2) The preparation method of polypropylene / polylactic acid graft copolymer: in this step, the molar ratio of the iodine group of the olefin / undecene iodine copolymer to the imidazole group in the polyester end group is 1:1, 1g olefin / The undecyl iodine copolymer was dissolved in 50mL of toluene at 80°C to fully dissolve the polymer, and 1.2g of polyester containing terminal imidazole was added, and heated to reflux for 24h. The reacted solution was poured into ethanol for sedimentation, filtered, and then the ionomer was washed three times with ethanol and ac...

Embodiment 3

[0041] 1) Synthesis of polylactic acid containing imidazole end groups: Dissolve L-lactic acid monomer and hydroxyethylimidazole in dichloroethane, the molar ratio of lactic acid monomer and hydroxyethylimidazole is 100:1, and then add 5uL N- Methyl-1,5,7-triazabicyclo[4,4,0]dec-5-ene (MTBD) was used as a catalyst and stirred at room temperature for 10 minutes to obtain polylactic acid with imidazole end groups.

[0042] 2) The preparation method of polypropylene / polylactic acid graft copolymer: in this step, the molar ratio of the iodine group of the propylene / undecene iodine copolymer to the imidazole group in the polyester end group is 1:1, 1g olefin / The undecyl iodine copolymer was dissolved in 50mL of toluene at 80°C to fully dissolve the polymer, and 1.5g of polyester containing terminal imidazole was added, and heated to reflux for 36h. The reacted solution was poured into ethanol for sedimentation, filtered, and then the ionomer was washed three times with ethanol and...

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Abstract

The invention relates to a high-toughness polypropylene / polylactic acid ion grafted copolymer and a preparation method thereof. The method comprises the following steps: an L-lactic acid monomer and hydroxyethyl imidazole are dissolved into dichloroethane, wherein a molar ratio of the lactic acid monomer to the hydroxyethyl imidazole is (100-400):1, 5-10 [mu]L of N-methyl-1,5,7-triazabicyclo[4,4,0]dec-5-ene is added as a catalyst, stirring is performed at room temperature for 10-30 min, so that polylactic acid having an imidazole end group is obtained; and a propylene / undecene iodide copolymeris dissolved into toluene, 1-1.5 g of the polyester containing the imidazole end group is added, heating reflux is performed, a quaternization reaction is performed, and therefore the polypropylene / polylactic acid grafted copolymer is obtained. The method provided by the invention has a simple process and low costs, and utilizes interaction of anions and cations to graft the polylactic acid ontoan iPP main chain; and the elongation at break of the material provided by the invention is greatly improved, and the elongation at break can be improved from a value of less than 10% (pure polylacticacid) to 600-780%.

Description

technical field [0001] The invention relates to olefin controllable polymerization technology and polyester synthesis technology, in particular to a synthetic ion graft copolymer with high molecular weight, narrow molecular weight distribution, high isotacticity and controllable insertion rate. Background technique [0002] Polyolefin is a general term for olefin homopolymers and copolymers, including polyethylene, polypropylene and poly-1-butene, as well as other olefin polymers. After the continuous development and innovation of catalysts and polymerization processes, and benefiting from the advantages of light weight, low price, easy processing, corrosion resistance, and good mechanical properties of polyolefin materials, polyolefin products have been firmly established in terms of production capacity and consumption. Occupy the position of the first variety of synthetic resin in the world. In recent years, polyolefin resins have changed from general-purpose materials to...

Claims

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Application Information

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IPC IPC(8): C08F283/02C08F210/06C08F2/00
CPCC08F2/00C08F283/02C08F210/06
Inventor 李悦生史书文潘莉张坤玉
Owner TIANJIN UNIV
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