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Application of ion liquid block polymer in supercritical carbon dioxide microcellular foaming

The technology of block polymer and diblock polymer is applied in the field of ionic liquid block polymer synthesis, which can solve the problems of unsatisfactory adsorption effect, low nucleation efficiency, and reduced foam material performance due to addition amount. To achieve the effect of easy control, enhanced solubility, and increased adsorption capacity

Inactive Publication Date: 2018-09-28
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of studies have found that the addition of general-purpose heterogeneous nucleating agents has a significant effect on CO 2 The adsorption effect is not ideal, and the nucleation efficiency is not high. Excessive addition will reduce the performance of the foam material

Method used

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  • Application of ion liquid block polymer in supercritical carbon dioxide microcellular foaming
  • Application of ion liquid block polymer in supercritical carbon dioxide microcellular foaming
  • Application of ion liquid block polymer in supercritical carbon dioxide microcellular foaming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 0.1050 gram of cyanomethyl dodecyl trithiocarbonate (CTA), 3.9225 gram of styrene (ST), 0.01 gram of azobisisobutyronitrile (AIBN), and 6 gram of toluene were carried out under nitrogen protection for RAFT reaction, Stir the reaction at 80°C for 24 hours, then cool down to 0-5°C to terminate the reaction to synthesize PS-CTA. Add 4.6151 grams of p-chloromethylstyrene monomer (VBC) and 0.0041 grams of azobisisobutyronitrile (AIBN) in the reaction solution after the PS-CTA is synthesized, react under the same conditions for 24 hours, and then react the reactant Vacuum drying gave 5.5223 g of the block polymer PS-b-PVBCl of monomer I and monomer II.

[0044] Get 1.2 grams of PS-b-PVBCl and place it in a round-bottomed flask, add 8 milliliters of DMF and 0.5721 grams of methylimidazole, stir and react at 80°C for 24 hours, then drop to 20-25°C to prepare PS-b-PVBnMeImCl, and then Add 1.1 g of NaBF to the reaction solution 4 And continue to react for 24 hours, after the re...

Embodiment 2

[0047] Get 1.2 grams of PS-b-PVBCl and place it in a round-bottomed flask, add 8 milliliters of DMF and 0.8652 grams of butylimidazole, stir and react at 80°C for 24 hours, and then drop to normal temperature to prepare PS-b-PVBnButImCl, then add it to the reaction solution Add 2.5 g lithium bis(trifluoromethanesulfonyl)imide (LiNTF 2 ) and continued to react for 24 hours, after the reaction was finished, the reactant was poured into 80 milliliters of methanol to separate out the product, the resulting mixed solution was suction filtered, and the filter cake was vacuum-dried to obtain 1.9321 gram of PS-b-PVBnButImNTF 2 .

[0048] Take 0.3 g of PS-b-PVBnButImNTF 2 , 5.7 grams of GPPS, extruded with a micro-extruder at 200 ° C for sample preparation, put into an autoclave and sealed, and a small amount of CO 2 Purge for 2 minutes, heat the autoclave to 90 °C, and inject CO into the autoclave 2 , the control pressure is 13.8MPa. After being saturated at constant temperature a...

Embodiment 3

[0050] Get 1.2 grams of PS-b-PVBCl and place it in a round-bottomed flask, add 8 milliliters of DMF and 1.3227 grams of trimethylamine aqueous solution, stir and react at 80°C for 24 hours, then drop to normal temperature to prepare PS-b-[VBTMA]Cl, and then Add 1.2 g of NaBF to the reaction solution 4 And continue to react for 24 hours, after the reaction, the reactant is poured into 80 milliliters of methanol to separate out the product, the resulting mixed solution is suction filtered, and the filter cake is vacuum-dried to obtain 1.7222 grams of PS-b-[VBTMA][BF 4 ].

[0051] Take 0.3 g of PS-b-[VBTMA][BF 4 ], 5.7 grams of GPPS, extruded with a micro-extruder at 200 ° C for sample preparation, then packed into an autoclave and sealed, with a small amount of CO 2 Purge for 2 minutes, heat the autoclave to 90 °C, and inject CO into the autoclave 2 , the control pressure is 13.8MPa. After being saturated at constant temperature and pressure for 12 hours, release to atmosphe...

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Abstract

The invention discloses a preparation method of a two-block polymer containing ion liquid. The preparation method comprises the following step of performing RAFT (reversible addition-fragmentation chain transfer) reaction, quaternarization reaction and ion exchange reaction on a RAFT reagent, a monomer I, a monomer II, a monomer III, an initiator and salt in a solvent, so as to obtain the ion liquid block polymer. The ion liquid block polymer can be used as an additive to be applied into the supercritical CO2 (carbon dioxide) foaming of the polymer, and be used for preparing the polymer microcellular foaming material. The size of the foam pore of the prepared foaming material can be reduced to 2 mum or below, and the nucleating rate of the foam pore is increased by three times or above.

Description

(1) Technical field [0001] The present invention relates to the synthesis of a kind of ionic liquid block polymer and its supercritical carbon dioxide (CO 2 ) Application in microcellular foaming. (2) Background technology [0002] Traditional foam materials have the advantages of high specific strength, good thermal insulation performance, excellent shock absorption, and low cost, and have been widely used in our daily life. However, compared with unfoamed materials, traditional foamed materials have disadvantages such as low mechanical strength, poor surface quality, and insufficient dimensional stability. For this reason, many recent studies have focused on the preparation of cells with a cell diameter below 10 μm and a cell density of 10 μm. 9 ~10 15 piece / cm 3 In addition to the advantages of traditional foam materials, this foam material also has excellent mechanical properties, opening up a new field of foam material development. [0003] Foaming agents commonly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/06C08L33/12C08L53/00C08J9/12C08F8/42C08F8/30C08F293/00C08F212/08C08F212/14
CPCC08F8/42C08F212/08C08F212/14C08F293/005C08F2438/03C08J9/0061C08J9/122C08J2203/06C08J2203/08C08J2205/044C08J2325/06C08J2333/12C08J2453/00C08F8/30
Inventor 何志才陈伟闫瑞强
Owner TAIZHOU UNIV
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