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Aromatic-aliphatic block copolyester and preparation method thereof

A block copolyester, aromatic technology, applied in the aromatic-aliphatic block copolyester, the field of preparation of the block copolyester, can solve the problem of crystallinity, crystallization speed decline, can not reach zero interfacial tension , frequent sequence rearrangement and other problems, to achieve the effect of clear sequence structure, easy synthesis and simple operation

Inactive Publication Date: 2011-05-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with block copolymers, the sequence length of each segment in multi-block copolymers is determined by the feed ratio and reaction process, and it is extremely difficult to control the sequence length distribution
Especially in the later stage of the polymerization reaction, the ester-ester exchange reaction makes the sequence rearrangement more frequent, and the transition from order to disorder occurs, which leads to a significant decrease in the crystallinity and crystallization speed of each component, which seriously affects the copolyester. Processing and mechanical properties
The research also shows that although multi-block copolymers can be used as compatibilizers for blend systems, their efficiency in reducing the interfacial tension of blend systems is much lower than that of block copolymers with clear structures, and they can never reach zero interfacial tension. Level

Method used

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  • Aromatic-aliphatic block copolyester and preparation method thereof
  • Aromatic-aliphatic block copolyester and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Step 1. The ring-opening polymerization of cyclic polybutylene terephthalate (CBT), that is, the preparation of macrocyclic polybutylene terephthalate (PBT) containing a catalyst.

[0024] Under nitrogen protection, put 10 g of CBT and 0.5 g of stannoxane catalyst into a 100 ml reaction flask that has been roasted and cooled with nitrogen protection. Anhydrous and anaerobic treated ortho-dichlorobenzene was added with a syringe so that the concentration of the reaction monomer CBT was 2Kg / L. The reaction was carried out at 180°C, and after 10 minutes the reaction was over (GPC monitoring showed no signal peak of CBT), cooled and filtered, and the reaction product was washed with anhydrous chloroform to wash away traces of unreacted CBT monomer, and baked at 60°C Dry.

[0025] Step 2. Catalyst-containing macrocyclic PBT initiates lactide polymerization. The 100ml reaction bottle was also treated anhydrous and oxygen-free, cooled under a nitrogen atmosphere, and then un...

Embodiment 2

[0035] Step 1: Ring-opening polymerization of cyclic polyethylene terephthalate (CET), that is, preparation of catalyst-containing macrocyclic polyethylene terephthalate (PET).

[0036] Under nitrogen protection, put 10 g of CET and 0.05 g of stannoxane catalyst into a 100 ml reaction flask that has been roasted and cooled with nitrogen protection. Anhydrous and anaerobic treated chlorobenzene was added with a syringe so that the concentration of the reaction monomer was 1Kg / L. The reaction was carried out at 120°C. After 48 hours, the reaction was completed (GPC monitoring had no signal peak of CET), cooled and filtered, and the reaction product was washed with chloroform also treated with anhydrous to wash away traces of unreacted CET monomer, and then vacuumed at 60°C drying.

[0037] Step 2. Catalyst-containing macrocyclic PET initiates lactide polymerization. The 25ml reaction bottle was also treated anhydrous and oxygen-free, cooled under a nitrogen atmosphere, and the...

Embodiment 3

[0041] Step 1. The ring-opening polymerization of cyclic polybutylene isophthalate, that is, the preparation of macrocyclic polybutylene isophthalate containing a catalyst.

[0042] Under nitrogen protection, 10 g of cyclic polybutylene isophthalate and 0.1 g of stannoxane catalyst were put into a 50 ml reaction flask that had been roasted and cooled with nitrogen protection. Add a mixed solvent of o-dichlorobenzene and chlorobenzene with a volume ratio of 2:1 after anhydrous and oxygen-free treatment with a syringe, so that the concentration of the reaction monomer cyclic polybutylene isophthalate is 2Kg / L. The reaction was carried out at 180°C, and after 10 minutes the reaction was over (GPC monitored the signal peak of acyclic polybutylene isophthalate), cooled and filtered, and the reaction product was washed with chloroform also treated with anhydrous to wash away traces of Unreacted cyclic monomers were vacuum-dried at 60°C.

[0043] Step 2. Catalyst-containing macrocyc...

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Abstract

The invention relates to an aromatic-aliphatic block copolyester and a preparation method thereof. The aromatic-aliphatic block copolyester contains an aromatic copolyester block and a polylactic acid block and is obtained by copolymerization of cyclic aromatic polyseter oligomer and lactide, i.e. initiating the cyclic aromatic polyseter oligomer with a catalyst for synthesizing an aromatic copolyester which contains the catalyst and has different molecular weights, and then initiating the lactide for synthesizing the required block copolyester. Due to a clear sequence structure, the aromatic-aliphatic block copolyester disclosed by the invention can be used as a compatilizer for studying the compatibility and mechanical property influences of a corresponding aromatic polyester and aliphatic polyester blends. The preparation method provided by the invention has the advantages of easiness of synthesis and simplicity in operation.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to an aromatic-aliphatic block copolyester, and also relates to a preparation method of the block copolyester. technical background [0002] Aromatic polyesters are a class of synthetic polymer materials developed in the 1950s. They have many advantages such as excellent mechanical properties, high thermal stability, chemical corrosion resistance, and low price. They have been widely used in the fields of fibers, films, and engineering plastics. Widely used, its main representatives are PET (polyethylene terephthalate) and PBT (polybutylene terephthalate). However, because aromatic polyester is not easy to degrade, it has great environmental safety hazards. [0003] In recent years, because of the easily hydrolyzed ester bond in the main chain of aliphatic polyester, it is easy to be degraded by enzyme catalysis under the action of microorganisms, thus showing biodegradabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/78
CPCC08G63/08C08G63/60
Inventor 周坚顾群史佳鑫蒋志强黎俊江盛鸿
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
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