Biodegradable multi-block polyester copolymer and method for preparing same
A biodegradable, multi-block technology, applied in the field of polyhydroxyacid polyester and aromatic polyester multi-block copolymers, can solve the problems of poor biodegradability and achieve improved biodegradability, easy degradation, and low cost low effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0019] Embodiment 1: Preparation of polyethylene terephthalate-diethylene glycol ester-polylactic acid multi-block polymer
[0020] 1) Preparation of hydroxyl-terminated lactic acid prepolymer.
[0021] In a 1L polymerization kettle, add 474g of 88% L-lactic acid and 6g of butanediol, pass through nitrogen for three times under reduced pressure, heat up to 140°C, distill out free water, and add 0.04g of stannous octoate catalyst after the initial polycondensation reaction for 30 minutes , stir and raise the temperature to 180°C, gradually reduce the pressure to 80Pa, and react for 2 hours to obtain a white powdery hydroxyl-terminated lactic acid prepolymer. The weight average molecular weight measured by gel permeation chromatography (GPC) is 5600, and the melting point measured by differential scanning calorimetry (DSC) is 128°C.
[0022] 2) Preparation of polyethylene terephthalate diethylene glycol ester prepolymer.
[0023] Put 249g of terephthalic acid (TPA), 83.7g of e...
Embodiment 2
[0026] Example 2. Preparation of polyethylene terephthalate-succinate copolyester-polylactic acid multi-block polymer.
[0027] 1) Preparation of polyethylene succinate terephthalate prepolymer.
[0028] Add 83g of terephthalic acid (TPA), 78g of ethylene glycol (EG), 0.1g of antimony trioxide as a catalyst, and 0.05g of stabilizer triphenyl phosphate into a 1L polymerization kettle, and replace it with nitrogen for three times under reduced pressure. Carry out the dehydration esterification reaction at 245°C and 4 atmospheres. After the reaction is complete, add 59g of succinic acid and 0.1g of butylstannoic acid, and continue the esterification reaction at 190-210°C under normal pressure. After the reaction is complete, decompress at The degree of vacuum is 100 Pa, and the reaction is carried out at 270-275° C. to obtain a polyethylene succinate terephthalate prepolymer. The weight average molecular weight measured by GPC was 7200, and the melting point measured by DSC was ...
Embodiment 3
[0030] Embodiment 3. Preparation of polyethylene terephthalate-diethylene glycol ester-polyglycolic acid multi-block polymer
[0031] 1) Preparation of polyglycolic acid prepolymer.
[0032] In a 1L polymerization kettle, add 450 grams of 70% glycolic acid and 6 g of butanediol, pass nitrogen gas and replace it under reduced pressure three times, heat up to 120 ° C, evaporate free water, and after the initial polycondensation reaction for 30 minutes, add 0.04 g of stannous octoate catalyst, stir and raise the temperature to 210°C, gradually reduce the pressure to 80Pa, and react for 2 hours to obtain a white powdery hydroxyl-terminated lactic acid prepolymer. The weight average molecular weight measured by gel permeation chromatography (GPC) is 7400, and the melting point measured by differential scanning calorimetry (DSC) is 184°C.
[0033] 2) Coupling reaction of polyethylene terephthalate-diethylene glycol ester-polyglycolic acid.
[0034] Put the dried 120g of polyethyle...
PUM
| Property | Measurement | Unit |
|---|---|---|
| melting point | aaaaa | aaaaa |
| melting point | aaaaa | aaaaa |
| melting point | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More