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Preparation method of carbon-dioxide-based polyester-polycarbonate quadriblock copolymer

A technology of block copolymer and carbon dioxide, which is applied in the field of polymer material synthesis, can solve the problems of unfavorable cost, high price cyclohexane, control, etc., to avoid residue, good light transmittance and foaming performance, The effect of raising the glass transition temperature

Pending Publication Date: 2020-06-26
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that adding epoxy cyclohexane for copolymerization can adjust the T of PPC in the range of 50-100 °C. g , but it is necessary to introduce a large amount of expensive epoxy cyclohexane, which is not conducive to cost control

Method used

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  • Preparation method of carbon-dioxide-based polyester-polycarbonate quadriblock copolymer
  • Preparation method of carbon-dioxide-based polyester-polycarbonate quadriblock copolymer
  • Preparation method of carbon-dioxide-based polyester-polycarbonate quadriblock copolymer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Under anhydrous and oxygen-free conditions, mix 30mmol phthalic anhydride, 30mmol cyclohexane oxide, 30mmol propylene oxide, 0.06mmol bis(triphenylphosphine)ammonium chloride, 0.12mmol triethylboron and 15mL tetrahydrofuran Put it into a 100mL autoclave, feed 1MPa carbon dioxide, react in an oil bath at 70°C for 24h, then cool the autoclave to room temperature with cold water, and release unreacted carbon dioxide slowly. Dichloromethane was added to dissolve the product, and an appropriate amount of 1M methanolic hydrochloric acid solution was added dropwise to quench the reaction, and the polymer was precipitated from ethanol. After vacuum drying, the molecular weight, glass transition temperature, polycarbonate content and tensile strength were measured. m n = 53.2 kDa, PDI = 1.15, T g = 95.9°C, polycarbonate content = 44%, tensile strength = 53.3 MPa.

Embodiment 2

[0024] Under anhydrous and oxygen-free conditions, mix 15mmol of phthalic anhydride, 30mmol of cyclohexane oxide, 30mmol of propylene oxide, 0.06mmol of bis(triphenylphosphine)ammonium chloride, 0.12mmol of triethylboron and 15mL of tetrahydrofuran Put it into a 100mL autoclave, feed 1MPa carbon dioxide, react in an oil bath at 70°C for 24h, then cool the autoclave to room temperature with cold water, and release unreacted carbon dioxide slowly. Dichloromethane was added to dissolve the product, and an appropriate amount of 1M methanolic hydrochloric acid solution was added dropwise to quench the reaction, and the polymer was precipitated from ethanol. After vacuum drying, the molecular weight, glass transition temperature, polycarbonate content and tensile strength were measured. m n = 58.7 kDa, PDI = 1.17, T g = 94.7°C, polycarbonate content = 70%, tensile strength = 48.0 MPa.

Embodiment 3

[0026] Under anhydrous and oxygen-free conditions, mix 45mmol of phthalic anhydride, 30mmol of cyclohexane oxide, 30mmol of propylene oxide, 0.06mmol of bis(triphenylphosphine)ammonium chloride, 0.12mmol of triethylboron and 15mL of tetrahydrofuran Put it into a 100mL autoclave, feed 1MPa carbon dioxide, react in an oil bath at 70°C for 24h, then cool the autoclave to room temperature with cold water, and release unreacted carbon dioxide slowly. Dichloromethane was added to dissolve the product, and an appropriate amount of 1M methanolic hydrochloric acid solution was added dropwise to quench the reaction, and the polymer was precipitated from ethanol. After vacuum drying, the molecular weight, glass transition temperature, polycarbonate content and tensile strength were measured. m n = 52.1 kDa, PDI = 1.16, T g = 101.5°C, polycarbonate content = 11%, tensile strength = 54.8 MPa.

[0027] From the above results, it can be seen that the polyester-polycarbonate tetrablock copo...

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Abstract

The invention relates to the technical field of polymer material synthesis, particularly to a preparation method of a carbon-dioxide-based biodegradable polyester-polycarbonate quadriblock copolymer.The block copolymer comprises a diblock copolymer (A-B type); the chain segment A is polycarbonate obtained by ring-opening polymerization of epoxypropane, cyclohexene oxide and CO2, and the chain segment B is aromatic polyester obtained by ring-opening polymerization of epoxypropane, cyclohexene oxide and phthalic anhydride. Commercialized Lewis acid-base pairs are used as catalysts; phthalic anhydride and cyclohexene oxide are successfully introduced into a main chain of polymethyl ethylene carbonate (PPC) through a one-pot one-step method, so that the glass-transition temperature, the thermal stability and the tensile strength of the PPC are greatly improved; and a problem of metal catalyst residues in the prior art is solved, and the application range of the PPC material is expanded.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis, and more specifically, to a preparation method of a carbon dioxide-based polyester-polycarbonate tetrablock copolymer. Background technique [0002] With the rapid development of global industrialization, a large amount of fossil energy has been developed and used, which not only causes the depletion of traditional energy sources, but also leads to the increase of carbon dioxide emissions and a serious greenhouse effect. At the same time, a large number of non-degradable plastic products are produced, and their wastes cause serious "white pollution". Both energy and environmental pressures promote CO 2 Research and application of base polymers. [0003] Since the first use of CO in 1969 2 Starting from the synthesis of polymethylethylene carbonate (PPC) materials, the synthesis and modification of PPC materials have been extensively studied. However, due to the glass transi...

Claims

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Application Information

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IPC IPC(8): C08G63/64C08G63/84C08G63/87
CPCC08G63/64C08G63/84C08G63/87
Inventor 孟跃中叶淑娴肖敏王拴紧梁嘉欣韩东梅
Owner SUN YAT SEN UNIV
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