A kind of high-performance aliphatic polyester elastomer and preparation method thereof

An aliphatic polyester, high-performance technology, applied in the field of thermoplastic elastomers, which can solve the problems of low tensile strength at break, and achieve excellent mechanical properties, high elongation at break, and easy disentanglement.

Active Publication Date: 2021-12-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyester elastomer obtained by combining the above monomers generally has an elongation at break of less than 2100%, and a tensile strength at break generally lower than 40 MPa, and the two cannot be combined, that is, only the elongation at break of the elastomer is relatively low. Higher stress can only be obtained when the elongation at break is higher, and the elastic body with a higher elongation at break often has a lower tensile strength at break. For example, the stress of an elastic body with an elongation at break of 2000% that has been reported so far is basically less than 13.5 MPa.
Therefore, the elongation at break and the tensile strength at break are mutually restricted, and the prior art cannot simultaneously obtain elastomers with larger elongation at break and tensile strength at break values.

Method used

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  • A kind of high-performance aliphatic polyester elastomer and preparation method thereof
  • A kind of high-performance aliphatic polyester elastomer and preparation method thereof
  • A kind of high-performance aliphatic polyester elastomer and preparation method thereof

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Experimental program
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preparation example Construction

[0076] The present invention provides the preparation method of high-performance aliphatic polyester elastomer described in above-mentioned technical scheme, comprises the following steps:

[0077] mixing ε-caprolactone, δ-valerolactone, a catalyst, an initiator and an organic solvent to perform a first polymerization reaction to obtain a polymerization product;

[0078] Mixing the polymerized product with the lactide monomer to perform a second polymerization reaction to obtain a high-performance aliphatic polyester elastomer;

[0079] The structure of the catalyst is

[0080] The initiator comprises dibasic alcohol, and described dibasic alcohol comprises

[0081] The lactide monomer is L-lactide, D-lactide, racemic lactide or glycolide;

[0082] The molar ratio of the initiator to the catalyst is (0.5~10):1; the molar ratio of the δ-valerolactone to the ε-caprolactone is (0.5~10):1; the lactide monomer and The molar ratio of ε-caprolactone is (0.5-10):1; the molar ...

Embodiment 1

[0107] In the present embodiment, the molar ratio of catalyst: terephthalic acid: ε-CL: δ-VL: LLA (L-type lactide) is 1:1:200:228:50, and the specific steps are:

[0108] Weigh 10mg (0.025mmol) of the catalyst and dissolve it in 500μL of anhydrous toluene, weigh 3.5mg (0.025mmol) of terephthalamide and add it to the obtained catalyst solution, then add 3.5mL of anhydrous toluene, react for one minute, and simultaneously add 529μLε- CL (5.0mmol) and 520μL δ-VL (5.7mmol), the polymerization reaction was started for 35min, and after the polymerization was completed, the 200 / 228 PCVL, add a dichloromethane solution containing 180mg (1.25mmol) LLA to the obtained product, and carry out polymerization for 15min. After the monomer is completely converted, add petroleum ether to quench the polymer, pump it to constant weight, and name the obtained elastomer sample for 25 PLLA- 200 / 228 PCVL- 25 PLLA, the structural formula is:

[0109]

[0110] Characterization and Testing...

Embodiment 2

[0115] In the present embodiment, the molar ratio of catalyst: terephthalic acid: ε-CL: δ-VL: LLA (L-type lactide) is 1:1:300:342:50, and the specific steps are:

[0116] Weigh 6.7mg (0.0167mmol) of the catalyst and dissolve it in 500μL of anhydrous toluene, weigh 2.3mg (0.0167mmol) of terephthalmic alcohol and add it to the obtained catalyst solution, then add 3.5mL of anhydrous toluene, react for one minute, and add 529μLε-CL (5.0mmol) and 520μLδ-VL (5.7mmol), start the polymerization reaction for 60min, and obtain after the polymerization is completed 300 / 342 PCVL, add a dichloromethane solution containing 120mg (0.835mmol) LLA to the obtained product, and carry out polymerization for 18 minutes. After the monomer is completely converted, add petroleum ether to quench the polymer, and pump it to constant weight. The obtained elastomer sample is named as 25 PLLA- 300 / 342 PCVL- 25 PLLA, the structural formula is:

[0117]

[0118] Characterization and Testing

[...

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Abstract

The invention provides a high-performance aliphatic polyester elastomer and a preparation method thereof, belonging to the technical field of thermoplastic elastomers. In the structure of the middle soft segment of the aliphatic polyester elastomer provided by the present invention, the homopolymerization connection is dominant, which is greater than the random copolymerization connection, and the whole is a gradient structure. At the same time, the two monomers in the random segment can Under the action of external force, the homopolymeric chains existing in the middle soft segment segment structure are easy to arrange and crystallize in an orderly manner, and the formed crystals are filled into the entire polymer network as a new hard phase to perform self-toughening. That is to say, the gradient of the high-performance aliphatic polyester elastomer provided by the present invention is similar to the elastic network formed by the multi-block soft segment. When the strain is provided, the stress of the material is induced by crystallization, thereby realizing super-tough thermoplasticity. Synthesis of polyester elastomers yields elastomers with high strength and high elongation at break.

Description

technical field [0001] The invention relates to the technical field of thermoplastic elastomers, in particular to a high-performance aliphatic polyester elastomer and a preparation method thereof. Background technique [0002] Thermoplastic elastomers have attracted extensive attention from researchers due to their good elasticity, ability to be thermally processed and recycled. Most of the currently commercialized thermoplastic elastomers are synthesized from chemicals derived from fossil energy sources. Due to the increasing depletion of petroleum resources and the fact that such elastomers cannot be degraded after service, they often cause serious white pollution. Degradable and non-renewable properties. Aliphatic polyester elastomers derived from renewable aliphatic cyclic lactone monomers have overcome the shortcomings of the above-mentioned petroleum-based elastomers due to their degradable and renewable characteristics, and have attracted the attention of researchers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08G63/83
CPCC08G63/08C08G63/823
Inventor 张越涛赵武超何江华
Owner JILIN UNIV
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