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Hydroxyl-terminated hyperbranched polyurethane-ester polymer as well as modified micro-fluidic chip and application thereof

A technology of terminal hydroxyl hyperbranching and microfluidic chip, which is applied in the preparation of organic compounds, cyanide reaction preparation, organic chemistry, etc., can solve the problem of separation peak tailing and broadening, separation efficiency and migration time repeatability decline, affecting organic Solve problems such as pesticide separation effect and microchannel surface inhomogeneity, achieve low cost, save money, and fast analysis speed

Inactive Publication Date: 2014-04-30
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the polydimethylsiloxane microfluidic chip itself also has some defects, such as the high hydrophobicity of the surface, so that sample molecules such as organic pesticides are strongly adsorbed on the surface of the microchannel due to hydrophobic interactions and other reasons, resulting in separation peaks. Tailing broadening, separation efficiency and migration time repeatability decline, severe adsorption will lead to separation failure, and even irreversible adsorption will make separation impossible; moreover, the surface of the PDMS microfluidic chip microchannel is not uniform, and the electroosmotic flow is unstable. Easy to change with changes in external conditions, affecting the separation effect of organic pesticides

Method used

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  • Hydroxyl-terminated hyperbranched polyurethane-ester polymer as well as modified micro-fluidic chip and application thereof
  • Hydroxyl-terminated hyperbranched polyurethane-ester polymer as well as modified micro-fluidic chip and application thereof
  • Hydroxyl-terminated hyperbranched polyurethane-ester polymer as well as modified micro-fluidic chip and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 Preparation of the second-generation hydroxyl-terminated hyperbranched polyamine-ester polymer

[0049] Nitrogen was passed into a 250 mL three-necked flask for 10 min, 26.638 g of diisopropanolamine, 17.218 g of methyl acrylate and 10 ml of methanol were mixed in a small beaker and then added to the three-necked flask, and the mixture was ventilated with nitrogen at room temperature for 10 min , stirred for 30 min and heated to 40 °C for 4 h, then distilled off methanol under reduced pressure to obtain a colorless and transparent oily AB 2 monomer, the reaction formula is as follows.

[0050]

[0051] Into a 250 mL four-necked bottle, nitrogen was passed for 10 min, and 9.8676 g of synthetic AB was added 2 Monomer, 0.0493 g of p-toluenesulfonic acid and 0.74595 g of triethanolamine, heated up to 85 °C, continued to flow nitrogen, stirred and reacted for 24 h, and then distilled under reduced pressure to remove methanol and unreacted small molec...

Embodiment 2

[0053] Example 2 Preparation of third-generation hydroxyl-terminated hyperbranched polyamine-ester polymers

[0054] In the 250 mL four-necked bottle, nitrogen was passed for 10 min, and 21.928 g of AB synthesized in Example 1 was added. 2 Monomer, 0.1096g of p-toluenesulfonic acid and 0.74595g of triethanolamine, heated up to 85°C, continued nitrogen flow, stirred and reacted for 24 hours, and then distilled under reduced pressure to remove methanol and unreacted small molecular compounds in the reaction to obtain the third Substituted hydroxyl-terminated hyperbranched polyamine-ester polymers. Among them, triethanolamine and AB 2 The molar ratio of the monomers is 1:21, and the structural formula of the third-generation hydroxyl-terminated hyperbranched polyamine-ester polymer is shown above.

Embodiment 3

[0055] Example 3 Preparation of the fourth-generation hydroxyl-terminated hyperbranched polyamine-ester polymer

[0056] In the 250 mL four-necked bottle, nitrogen was passed for 10 min, and 43.856 g of AB synthesized in Example 1 was added. 2 monomer, 0.2193g of p-toluenesulfonic acid and 0.74595g of triethanolamine, the temperature was raised to 85°C, nitrogen was continued to flow, and the reaction was stirred for 24 hours, and then methanol and unreacted small molecule compounds in the reaction were distilled off under reduced pressure to obtain the fourth Substituted hydroxyl-terminated hyperbranched polyamine-ester polymers. Among them, triethanolamine and AB 2 The molar ratio of the monomers is 1:45, and the structural formula of the fourth-generation hydroxyl-terminated hyperbranched polyamine-ester polymer is shown above.

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Abstract

The invention relates to the technical field of pesticide residue detection, and in particular relates to a hydroxyl-terminated hyperbranched polyurethane-ester polymer. The hydroxyl-terminated hyperbranched polyurethane-ester polymer is prepared by the following steps: implementing reaction between diisopropanol amine and methyl acrylate which are equal in molar mass to obtain an AB2 monomer; and carrying out reaction among AB2 monomer, p-toluenesulfonic acid and triethanolamine to obtain the hydroxyl-terminated hyperbranched polyurethane-ester polymer. The invention further relates to a hyperbranched polymer modified polydimethyl siloxane (PDMS) micro-fluidic chip and application of the hyperbranched polymer in the technical field of pesticide residue detection. The prepared PDMS micro-fluidic chip disclosed by the invention has permanent hydrophilcity, and is capable of effectively improving stability of a polymer coating, free from use of expensive instrument and reasonable in price; and the coated capillary has the characteristics of small size, simple operation, low sample dosage, high separation efficiency and high analysis speed, and is capable of separating and detecting organic pesticide residue very well.

Description

technical field [0001] The invention relates to the technical field of pesticide residue detection, in particular to a hydroxyl-terminated hyperbranched polyamine-ester polymer, and to the use of a PDMS (polydimethylsiloxane) microfluidic chip modified by the hyperbranched polymer in the application of pesticides. Applications in the field of residue detection technology. Background technique [0002] At present, my country has become the second largest pesticide user country in the world, especially for vegetables, melons and fruits with a short growth period. Due to the large number of insect pests and excessive application of pesticides, the phenomenon of excessive pesticide residues is becoming more and more serious. The long-term use of organic pesticides makes them easily adsorbed in soil organic matter, and can enter the food chain through plant absorption, which poses a potential threat to the ecological environment and human health. Therefore, the problem of organic...

Claims

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Application Information

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IPC IPC(8): C08G63/685C07C227/18C07C229/12C08J7/12B01L3/00G01N33/00
Inventor 寿崇琦刘杰
Owner UNIV OF JINAN
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