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Segmented copolymer of poly-p-dioxanone/polyethylene glycol terephthalate and preparation method thereof

A technology of polyethylene terephthalate and polyethylene terephthalate, which is applied in the field of polyethylene terephthalate/polyethylene terephthalate multi-block copolymer and its preparation field , can solve the problems of difficult copolymerization materials, poor thermal stability of PPDO, etc., to achieve good thermal stability and mechanical processing performance, wide performance range, and ensure the effect of singleness

Active Publication Date: 2011-04-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If PET with excellent heat resistance and mechanical properties is introduced into PPDO, it is theoretically speculated that the mechanical properties and corresponding thermal stability of PPDO will undoubtedly be significantly improved. However, due to the high melting point of general PET (270-280 ° C), and The thermal stability of PPDO is poor, which makes PPDO decompose very violently at the melting point of PET. Therefore, it is difficult to perform conventional melting reactions with it at the melting point of PET. It is also very difficult to obtain high molecular weight copolymerized materials. difficulty

Method used

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  • Segmented copolymer of poly-p-dioxanone/polyethylene glycol terephthalate and preparation method thereof
  • Segmented copolymer of poly-p-dioxanone/polyethylene glycol terephthalate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Mix dimethyl terephthalate and 1,4-butanediol in a molar ratio of 1:2, and 0.10% catalyst zinc acetate based on the mass percentage of dimethyl terephthalate, at 170°C Under the transesterification reaction for 4 hours, the resulting -1,4-butanediol terephthalate was mixed with ethylene terephthalate in a molar ratio of 1:3, and then the dimethyl terephthalate used in the reaction was added 0.08% antimony trioxide catalyst based on the total weight of the ester can be polycondensed for 3 hours at a temperature of 260° C. and a pressure of 90 Pa. The resulting product had an intrinsic viscosity of 0.34 dl / g and a melting point of 123°C.

[0029] Mix the obtained modified low-melting-point PET prepolymer with hydroxyl groups at both ends and the hydroxyl-terminated PPDO prepolymer with an intrinsic viscosity of 0.29dl / g in a molar ratio of 2:8, heat up to melting, and under the protection of nitrogen, Add the coupling agent hexamethylene diisocyanate in an amount of 1.8%...

Embodiment 2

[0031]Dimethyl terephthalate and 1,4-cyclohexanedimethanol in a molar ratio of 1:3 are mixed with 0.05% catalyst zinc acetate in terms of mass percentage of dimethyl terephthalate, and The transesterification reaction was carried out at 175°C for 5 hours, and the resulting 1,4-cyclohexanedimethanol terephthalate was mixed with ethylene terephthalate at a molar ratio of 1:1, and then the terephthalic acid used in the reaction was added. 0.10% antimony trioxide catalyst based on the total weight of dimethyl diformate can be polycondensed for 4 hours at a temperature of 270° C. and a pressure of 150 Pa. The resulting product had an intrinsic viscosity of 0.22 dl / g and a melting point of 116°C.

[0032] After mixing the modified low-melting-point PET prepolymer with hydroxyl groups at both ends and the hydroxyl-terminated PPDO prepolymer with an intrinsic viscosity of 0.20dl / g in a molar ratio of 4:6, heat up to melting, and under the protection of nitrogen, Add the coupling agen...

Embodiment 3

[0034] The preparation process of low-melting-point PET is the same as that of Example 2, so it will not be repeated. The resulting product had an intrinsic viscosity of 0.20 dl / g and a melting point of 110°C.

[0035] After mixing the obtained modified low-melting-point PET prepolymer with hydroxyl groups at both ends and the hydroxyl-terminated PPDO prepolymer with an intrinsic viscosity of 0.33dl / g in a molar ratio of 1:9, heat up to melting, and under the protection of nitrogen, Add the coupling agent toluene diisocyanate in an amount of 0.5% of the total weight of the low melting point PET and the PPDO prepolymer, then react at 140°C for 240 minutes and discharge. The resulting product had an intrinsic viscosity of 0.50 dl / g and a melting point of 100°C.

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Abstract

The invention disclosess a segmented copolymer of poly-p-dioxanone / polyethylene glycol terephthalate; the copolymer is characterized of being prepared by dropping coupling agent diisocyanates in a fused mass formed by melting modified low-melting polyethylene glycol terephthalate pre-polymers whose melting point is not greater than 210 degrees centigrade, the limiting viscosity number is not greater than 1.5 dL / g and both ends are hydroxyl groups, and poly-p-dioxanone whose the limiting viscosity number is not greater than 0.8 dL / g and both ends are hydroxyl groups at a certain temperature, the limiting viscosity number of the copolymer is 0.5 to 2.5 dL / g, and the melting point is at 100 to 180 degrees centigrade. The invention further discloses a method for preparing the copolymer. The segmented copolymer discloseed by the invention has high molecular weight and excellent thermal stability and machinability, and has excellent biodegradability of poly-p-dioxanone, which lays the foundation for the materials as commercial macromolecular material. The invention is simple in process and easy to control the reaction, thereby realizing large-scale and continuous industrial production.

Description

technical field [0001] The invention belongs to the technical field of copolymerization modification of polyethylene terephthalate and polydioxanone, in particular to polydioxanone / polyethylene terephthalate multi-block copolymer and its preparation method. Background technique [0002] Polyethylene terephthalate (PET) has excellent heat resistance, chemical resistance, toughness, electrical insulation, safety and other advantages, and has been widely used in fibers, films, engineering plastics, polyester bottle and other fields, but because it belongs to a traditional petroleum-based material, it is currently facing two severe challenges: on the one hand, with the gradual depletion of petroleum resources, the price has risen sharply, and its cost is also rising. On the one hand, traditional petroleum-based materials are difficult to degrade, and will cause serious pollution to the environment on which human beings depend after being used and discarded. [0003] Polydioxan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/685C08G63/78
Inventor 汪秀丽宫杰王玉忠杨科珂陈思翀
Owner SICHUAN UNIV
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