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High-molecular-weight high-flexibility bio-based polycarbonate copolymer and preparation method thereof

A polycarbonate, high molecular weight technology, applied in the field of polycarbonate preparation, can solve the problems of unsatisfactory industrial use, poor mechanical properties and processability, and achieve the effects of easy rotation, improved mechanical properties, and mild reaction conditions

Active Publication Date: 2020-05-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1,4; 3,6-dianhydrohexanol has two hydroxyl groups and is formed by fusion of two tetrahydrofuran rings. Due to its special structure (rigid and saturated heterocyclic structure), it is based on 1,4; 3,6 - Polycarbonate synthesized from dianhydrohexyl alcohol is a polymer material with high molecular weight and high glass transition temperature, but at the same time, its mechanical properties and processability are poor, and it cannot meet industrial purposes

Method used

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  • High-molecular-weight high-flexibility bio-based polycarbonate copolymer and preparation method thereof
  • High-molecular-weight high-flexibility bio-based polycarbonate copolymer and preparation method thereof
  • High-molecular-weight high-flexibility bio-based polycarbonate copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] At room temperature, 6.43g diphenyl carbonate, 3.07g isosorbide, 1.75g ​​tetraethylene glycol (HO-CH 2 CH 2 -O-CH 2 CH 2 -O-CH 2 CH2 -O-CH 2 CH 2 -OH) into a 250ml three-necked flask, under nitrogen atmosphere protection, after heating up to 130°C, add catalyst 1-butyl-3-methylimidazole lactate, the amount of catalyst is 0.005mol% of the amount of diphenyl carbonate. Stir at 130°C for 3 hours for transesterification reaction, then gradually increase the temperature and gradually lower the pressure to 240°C, 50 Pa, keep for 0.5 hour, the reaction is completed, and the copolymer is obtained with a yield of 98%. The reaction product was characterized, and a polycarbonate copolymer with a number average molecular weight of 121000 g / mol was obtained.

[0032] Copolymer 1 H-NMR spectrum as figure 1 As shown, it shows that the copolymer structure is correct; the glass transition temperature of the copolymer measured by DSC is 72°C, and the 5% thermal weight loss temper...

Embodiment 2

[0034] Same as in Example 1, except that the temperature in the transesterification stage was 110° C., other conditions remained unchanged to obtain a copolymer with a yield of 98%. The reaction product was characterized to obtain a polycarbonate copolymer with a number average molecular weight of 60000 g / mol.

Embodiment 3

[0036] Same as in Example 1, except that the temperature in the transesterification stage was 150° C., other conditions remained unchanged to obtain a copolymer with a yield of 98%. The reaction product was characterized to obtain a polycarbonate copolymer with a number average molecular weight of 65000 g / mol.

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Abstract

The invention provides a high-molecular-weight high-flexibility bio-based polycarbonate copolymer and a preparation method thereof. According to the preparation method, in the nitrogen atmosphere, Triphosgene, 1, 4: 3, 6-dianhydrohexanehexol and a dihydroxy compound serve as raw materials, a catalyst is added, and the high-molecular-weight high-flexibility polycarbonate copolymer is obtained through two stages of ester exchange and condensation polymerization. The number-average molecular weight of the obtained polycarbonate copolymer is 2.5 * 10 <4>-12.1 * 10 <4> g / mol, the glass-transition temperature is 50-200 DEG C, the 5% thermal weight loss temperature is 330 DEG C or above, and the polycarbonate copolymer has excellent mechanical properties and can be effectively used for multiple purposes. Compared with homopolycarbonate, the polycarbonate copolymer has the advantages that the molecular weight, the polymerization degree, the mechanical property, the thermal stability and the like are obviously improved, meanwhile, the synthesis process is green and environment-friendly, and highly toxic raw material products such as phosgene are not involved.

Description

technical field [0001] The invention relates to the field of polycarbonate preparation, in particular to a bio-based polycarbonate copolymer with high molecular weight and high flexibility and a preparation method thereof. Background technique [0002] Most of the raw materials for the production of polycarbonate come from petroleum derivatives, but with the crisis of depletion of petroleum resources and the call of the country for green environmental protection, raw materials from biomass resources have great development prospects. However, these plant-based monomers often have multiple functional groups, which makes the synthesized polycarbonates have uncertain structures and poor chemical stability. [0003] 1,4;3,6-dianhydrohexanol is produced from starch in cereals through catalytic decomposition, hydrogenation and further dehydration. There are three isomers of 1,4;3,6-dianhydrohexanol, which are isosorbide, isomannide and isoidide, and isosorbide has been industriali...

Claims

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Application Information

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IPC IPC(8): C08G64/30
CPCC08G64/305
Inventor 徐菲李晨浩张振才安宏哲杨子锋方文娟孙玮张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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