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Four-arm star-shaped polymer and preparation method thereof

A polymer, star-shaped technology, applied in the field of four-arm star-shaped polymer and its preparation, can solve problems such as the influence of micelle behavior, and achieve the effect of improving conversion rate and good stability

Active Publication Date: 2019-08-20
XIJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the number and nature of the arms in the star polymer greatly influence the micellar behavior

Method used

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  • Four-arm star-shaped polymer and preparation method thereof
  • Four-arm star-shaped polymer and preparation method thereof
  • Four-arm star-shaped polymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Tetra (2-bromopropionate) pentaerythritol ester (Br 4 Pr) synthesis

[0052]

[0053] 3.40 g of pentaerythritol (Pr-OH) was suspended in 100 mL of dry tetrahydrofuran (THF), and 16 mL of 2-bromopropionyl bromide was added at 0°C under magnetic stirring. Then, the dried pyridine / tetrahydrofuran (12mL / 20mL) mixed solution was added dropwise to the reaction system within 30 minutes. After the dropwise addition, the reaction system was moved to an oil bath at 25°C and stirring continued for 24 hours.

[0054] After the stirring, the insoluble matter was filtered off, and the solvent in the filtrate was removed by rotary evaporation to obtain a red-brown solid crude product.

[0055] The crude product was dissolved in 100 mL of dichloromethane, washed with 100 mL of 0.1 mol / L hydrochloric acid solution, 100 mL of saturated sodium carbonate aqueous solution and 100 mL of water in turn, and then dried over anhydrous magnesium sulfate, and the dichloromethane was removed by a rot...

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Abstract

The invention discloses a four-arm star-shaped polymer and a preparation method thereof. The polymer has a structure as shown in formula (I) which is described in the specification. In the formula (I), m is in a range of 40 to 150, and n is in a range of 100 to 200. The polymer is prepared through an ATRP reaction of a compound 1 with N-isopropylacrylamide, and the conversion rate of the raw materials during the reaction is improved. The four-arm star-shaped polymer of the invention has a low CMC value in an aqueous solution through the controlling of the polymerization degree of MMA and NIPAmin a block copolymer, indicating that a micelle formed by the four-arm star-shaped polymer has good stability.

Description

Technical field [0001] The invention relates to a star-shaped polymer, in particular to a four-arm star-shaped polymer and a preparation method thereof. Background technique [0002] Star polymer is a type of branched polymer composed of a central core and several linear chains (arms) emitted from the core. According to the type and composition of its arms, star polymers are generally divided into: homogeneous arm type And hetero-arm type star copolymer. The solution properties and rheological characteristics of star-shaped polymers are different from those of linear polymers. At the same time, because of their compact structure, functional groups can exist in the polymer at a high density. These properties make the star-shaped polymers useful in drug delivery and catalysts. Carriers, optical imaging and other aspects have important application prospects. With the development of polymer science, a variety of polymerization techniques have been used to prepare star polymers. Amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00
CPCC08F293/005C08F2438/01
Inventor 宋文琦
Owner XIJING UNIV
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