Styrenic block copolymer and preparation method thereof

A technology of block copolymers and styrenes, which is applied in the field of styrenic block copolymers and its preparation, can solve the problems of cumbersome steps for hydroxyl-functionalized polymers, difficulty in controlling the sulfonation reaction process, and cumbersome preparation process, etc. Achieve the effects of improving the use temperature and thermal stability, enhancing interaction, and enhancing hydrophilicity

Active Publication Date: 2021-04-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented polymer has several technical advantages: it uses an organosulfurized vinyl resin that includes specific types of chemicals called sulfur atoms or salts thereof (nitrogen), phosphoruminositronate ion(PSI)iononaphthaluminate salt(PTS)) and ammonia for better performance during use under extreme conditions like temperatures above 60 degrees Celsius. It also improves its ability to heal itself when exposed to heat over time due to its own unique chemistry. Additionally, this new type of rubber made from these materials exhibits improved resistance against degradative factors caused by external environments compared to traditional rubbers.

Problems solved by technology

This patented technology describes how certain materials called therapeutic agents like pharmaceuticals and biomedics can behave differently depending upon their environment conditions such as pressure, moisture content, temperatures, etc., making it challenged to develop these compounds without sacrificing qualifications during syntheses due to complexity involved in forming blocks containing specific structures. Additionally, current methods involve multiple step processes involving expensive reagents and may result in poor quality final products.

Method used

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  • Styrenic block copolymer and preparation method thereof
  • Styrenic block copolymer and preparation method thereof
  • Styrenic block copolymer and preparation method thereof

Examples

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preparation example Construction

[0027] The preparation method of the styrenic block copolymer provided by the invention comprises the following steps:

[0028] S1, isobutylene, styrene and p-methylstyrene are obtained through sequential living cationic copolymerization in the presence of an initiating system to obtain a polyisobutylene segment with a structure shown in formula (1) and styrene with a structure shown in formula (5) Block copolymers (SMB) of random copolymerized segments with p-methylstyrene structural units;

[0029]

[0030] Wherein, n is 200~1800, the total number (m) of styrene structural units accounts for 0.5~29% of the total moles of all structural units, and the total number (g) of p-methylstyrene structural units accounts for 0.5~29% of the total moles of all structural units. 1.05-43%.

[0031] S2, carry out bromination reaction / chlorination reaction in organic solvent with the block copolymer obtained in step S1 and bromination / chlorination reagent, obtain bromination / chlorinatio...

Embodiment 1

[0078] This example serves to illustrate the azonia-ionized poly[(p-methylstyrene-co-styrene)-b-isobutylene-b-(styrene-co-p-methylstyrene)] block copolymer (FSMB -1) Preparation and properties.

[0079] Preparation of S1 and SMB-1

[0080] Under the protection of high-purity nitrogen at -78°C, 110 mL of dichloromethane, 164 mL of n-hexane, 0.3 mol of isobutene (IB) and 0.845 mmol of bifunctional initiator 1,4-bis(2-chloro-2 -Propyl)benzene (DCC), add 7.0mL containing co-initiator FeCl 3 With the additive isopropanol (POH) solution (of which: FeCl 3 :POH=1:1.4), so that the concentration of IB in the reaction system is 1.0mol / L, DCC:FeCl 3 : IB=1:3.6:355 (molar ratio), reaction 15min, IB monomer is fully converted, obtains polyisobutylene double-end active chain; Add 100mL containing styrene (St, 68.7mmol) and p-methylstyrene (pMS, 34.4mmol) in dichloromethane / normal hexane (4 / 6, v / v) mixed solution, further carry out active cationic block copolymerization reaction, the rea...

Embodiment 2

[0088] The preparation method of S1 and SMB-2 is the same as step S1 in Example 1. At -80°C and under the protection of high-purity nitrogen, add 220mL of dichloromethane, 328mL of n-hexane, 0.6mol of isobutene and 3.38mmol of DCC into the polymerization reactor and mix well, add 14mL of FeCl containing co-initiator 3 With POH solution (where: FeCl 3 :POH=1:1.4), so that the concentration of IB in the reaction system is 1.0mol / L, DCC:FeCl 3 : IB=1:3.6:178 (molar ratio), polymerization reaction 15min, IB monomer is fully transformed, obtains polyisobutylene two-terminal active chain; Only the feeding amount of St and pMS mixed solution is reduced, add 120mL containing 82.4mmol styrene and 41.2mmol methylene chloride / n-hexane (4 / 6, v / v) mixed solution of p-methylstyrene, obtain poly(styrene-co-p-methylstyrene)-b-polyisobutylene-b-poly( Styrene-co-p-methylstyrene) triblock copolymer SMB-2.

[0089] S2, BSMB-2 preparation method is the same as step S2 in embodiment 1, just Br2 ...

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Abstract

The invention belonging to the field of elastomers, and discloses a styrenic block copolymer and a preparation method thereof. The preparation method of the styrenic block copolymer comprises the following steps: S1, carrying out a sequential active cation copolymerization reaction on isobutene, styrene and p-methylstyrene in the presence of a cation initiator to obtain a block copolymer; S2, carrying out a bromination/chlorination reaction on the block copolymer and a bromination/chlorination reagent to obtain a brominated/chlorinated block copolymer; and S3, carrying out side group nitrogen onium/phosphorus onium ion functionalization, amino functionalization or hydroxyl functionalization on the brominated/chlorinated block copolymer. According to the styrenic block copolymer provided by the invention, side functional groups interact with one another to form a thermally reversible physical crosslinking point and a three-dimensional network structure, so the copolymer has excellent self-repairing performance at a certain temperature, the use temperature, the thermal stability and the hydrophilicity of the copolymer are improved, the mechanical property of the copolymer is improved, and the copolymer is enhanced and toughened.

Description

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Claims

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Application Information

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Owner BEIJING UNIV OF CHEM TECH
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