Preparation method for biodegradable fluorescent polyester multipolymer

A biodegradable and copolymer technology, applied in the field of functional materials, can solve the problem of increasing white blood cells

Inactive Publication Date: 2009-09-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The monomer 3,4-dihydroxycinnamic acid (DHCA, commonly known as caffeic acid) involved in the present invention can be purified from natural plants such as coffee beans and papaya, and is used as an active ingredient of Chinese herbal medicine due to its unique structure of caffeic acid , has the function of promoting choleresis and increasing white

Method used

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  • Preparation method for biodegradable fluorescent polyester multipolymer
  • Preparation method for biodegradable fluorescent polyester multipolymer
  • Preparation method for biodegradable fluorescent polyester multipolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 1.8012g (10mmol) of 3,4-dihydroxycinnamic acid (DHCA), 0.3215g (0.8mmol) of polyethylene glycol 400 (PEG400), 0.0085g (0.1mmol) of sodium acetate (ACONa), and measure acetic anhydride (AC 2 O) 10mL, put it into a 100mL three-necked flask, raise the temperature of the three-necked flask to 110°C at a stirring speed of 200r / min, heat up to 190°C after 1.5h of reaction, reduce the stirring speed to 120r / min and then react at a constant temperature for 7h, the whole reaction process in N 2 Protected and protected from light.

[0031] Wash twice with deionized water, then wash twice with absolute ethanol, remove unreacted monomers and catalysts, and then dry naturally to obtain a yellow or light yellow powder product.

Embodiment 2

[0033] Weigh 1.8026g (10mmol) of 3,4-dihydroxycinnamic acid (DHCA), 0.3863g (4.3mmol) of lactic acid (D, L-LA), 0.0310g (0.4mmol) of sodium acetate (ACONa), and measure acetic anhydride (AC 2 (2) 20mL, add in 250mL there-necked flask, the temperature of the three-necked flask is raised to 120°C at a stirring speed of 360r / min, the temperature is raised to 210°C after 2h of reaction, the stirring speed is reduced to 150r / min and then reacted at a constant temperature for 6h, the whole reaction process is at N 2 Protected and protected from light.

[0034] Wash twice with deionized water, then wash twice with absolute ethanol, remove unreacted monomers and catalysts, and then dry naturally to obtain a yellow or light yellow powder product.

Embodiment 3

[0036] Take by weighing 3.6042g (20mmol) of 3,4-dihydroxycinnamic acid (DHCA), 0.6909g (5.0mmol) of p-hydroxybenzoic acid (p-HA), 0.0167g (0.2mmol) of sodium acetate (ACONa), and measure B Anhydride (AC 2 (0) 18mL, add in 250mL there-necked flask, the temperature of the three-necked flask is raised to 135°C at a stirring speed of 400r / min, the temperature is raised to 210°C after 2 hours of reaction, the stirring speed is reduced to 130r / min and then reacted at constant temperature for 9h, the whole reaction process is in N 2 Protected and protected from light.

[0037] Wash twice with deionized water, then wash twice with absolute ethanol, remove unreacted monomers and catalysts, and then dry naturally to obtain a yellow or light yellow powder product.

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Abstract

The invention relates to a preparation method for a biodegradable fluorescent polyester copolymer, belonging to the field of functional materials. The method comprises the following steps: using 3,4-dihydroxy cinnamic acid as a main monomer, using PEG400, PEG1000, PEG2000, PEG4000 and PEG6000 with different molecular weights, lactic acid, p-hydroxybenzoic acid or lithocholic acid as functional monomers and using sodium acetate as a catalyzer and acetic anhydride as a solvent; and adopting a two-step melting polycondensation method to obtain a caffeic acid ester copolymer with controllable molecular weight, glass transition temperature, fluorescence intensity, degradation speed, and the like so that the caffeic acid ester copolymer can be used as a degradation material or a fluorescent probe and applied to the fields of organizational projects, biological medicines, environmental protection, and the like. The invention provides a simple convenient high-efficiency method for preparing the biodegradable copolymer which has fluorescent performance.

Description

technical field [0001] The invention discloses a preparation method of a biodegradable fluorescent polyester copolymer, which belongs to the field of functional materials. Background technique [0002] With the development and application of new technologies, various new polymer materials have sprung up and have been widely used in various production departments and people's daily life. Although they have many advantages, with the increase of application time, more and more environmental problems have emerged. The annual plastic waste produced in the world is about 60% to 70% of its output. More than 70% of the raw materials used in the manufacture of polymer materials come from petroleum. It is estimated that the average oil consumption of 1kg of polymer materials is 3L. The annual production of 7 million tons of polymer material waste means that 2.1 billion liters of petroleum is wasted every year. Therefore, the ecological design and recycling of polymer materials is the...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08G63/06
Inventor 陈明清徐亚鹏倪忠斌李继航胡娜李会玲
Owner JIANGNAN UNIV
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