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Copolymers with hard polyamide blocks and soft blocks comprising polyethylene glycol

A polyamide block and polyethylene glycol technology, applied in the field of copolymers, can solve problems such as increased water absorption and deterioration of mechanical properties of the membrane

Pending Publication Date: 2022-04-15
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water uptake is also greatly increased, which leads to the deterioration of the mechanical properties of the membrane in the water saturated state

Method used

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  • Copolymers with hard polyamide blocks and soft blocks comprising polyethylene glycol
  • Copolymers with hard polyamide blocks and soft blocks comprising polyethylene glycol
  • Copolymers with hard polyamide blocks and soft blocks comprising polyethylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0192] Membranes were produced from various copolymers containing polyamide blocks and soft blocks via a flat film extrusion process ("extrusion casting") using an extruder with the following parameters:

[0193] -Screw diameter: 30mm;

[0194] -L / D ratio: 25

[0195] - profile: screw - partition (baffle, barrier);

[0196] - Die: T-shaped, 250 μm wide and 300 μm air gap.

[0197] The extrusion temperature was between 180°C and 230°C and was varied to suit the guard of the copolymer.

[0198] The characteristics of the copolymers and membranes are given in the table below:

[0199] [Table 1]

[0200]

[0201] The copolymer of membrane 8 is prepared from PEG diamine blocks.

[0202] Membranes 7 to 10 are according to the invention, and membranes 1 to 6 correspond to comparative examples.

[0203] Various properties of these diaphragms were tested and the results are given below:

[0204] [Table 2]

[0205]

[0206] Permeability to water vapor MVTR is measured at 2...

Embodiment 2

[0224] Branched copolymers are prepared according to a two-step process, in which polyamide blocks are first synthesized by mixing polyamide precursors with branching agents, and then soft blocks derived from PEG are added and combined with the polyamide blocks condensation.

[0225] These copolymers have the following characteristics:

[0226] [table 3]

[0227]

[0228] The mass amount of branching agent corresponds to the mass percentage of branching agent added with the polyamide precursor during the synthesis of the copolymer relative to the total weight of all copolymer reagents.

[0229] PEBA numbers 11, 12, 13, and 14 were prepared from PEG diamine blocks.

[0230] In PEBA No. 15, the polyamide block comprises 70 mol % of PA6 and 30 mol % of PA11 and thus has an average carbon content of repeat units of 7.5.

[0231] PEBA No. 15 is a copolymer according to the invention, PEBA Nos. 11 to 14 correspond to comparative examples.

[0232] The water absorption (or wat...

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Abstract

The invention relates to a copolymer having hard polyamide blocks and soft blocks, containing, relative to the total weight of the copolymer: between 55% and 90% by weight of soft blocks, at least 35% by weight of which is derived from polyethylene glycol; between 10% and 45% by weight of a hard polyamide block, wherein the average carbon content in the repeating units of the polyamide block is greater than or equal to 7. The invention also relates to a method for preparing such a copolymer, a membrane comprising such a copolymer and a method for preparing such a membrane.

Description

technical field [0001] The present invention relates to copolymers containing rigid polyamide blocks and soft blocks, processes for preparing such copolymers, and membranes (membranes, membranes) formed from the copolymers. Background technique [0002] Greenhouse gas emissions and their impact on global warming have become a major concern. Various technologies have been developed for recovering gases that contribute to the greenhouse effect, such as carbon dioxide and methane. Among them, polymer-type gas separation membranes have been developed due to their low environmental impact. Gas separation membranes are also used in a variety of other applications, for example for the purification of natural gas or in new enthalpy heat exchangers. [0003] WO 2018 / 222255 describes a gas separation process using a membrane comprising a crosslinked mixture of polyetheramide copolymer and acrylate-terminated polyethylene glycol. [0004] The paper by Scholes et al. (Crosslinked PEG...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/40C08J5/18C08L77/00B01D53/22B01D67/00B01D69/02B01D71/80
CPCB01D71/80C08G81/00C08G69/44C08J5/18C08L77/12C08J2377/12B01D71/56B01D2325/20B01D53/228B01D2257/504B01D2257/80B01D2257/708B01D2257/304B01D53/268Y02C20/40Y02P20/151B01D71/5222B01D71/5211B01D71/5223
Inventor Q.皮诺C.科克特H.切米内特C-O.博伊西尔
Owner ARKEMA FRANCE SA
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