Thermo-responsive polymers and advances in their applications in separation science

Musarurwa, Herbert; Tavengwa, Nikita Tawanda

doi:10.1016/j.microc.2022.107554

Cited by 14 publications

(15 citation statements)

References 106 publications

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“…In particular, it is possible to observe that T cp is a linear function of p , which therefore represents the main factor in determining the thermo-responsive behavior of these copolymers. This finding is indeed in line with what is already reported in other studies. ,− On the other hand, the role played by the microstructure of the solvophilic block on the T cp is never considered. The systematic investigation carried out in this work instead also allows elucidating the influence of the solvophilic parameters n and q on the copolymer cloud point.…”

Section: Resultssupporting

confidence: 91%

Role of the Polymer Microstructure in Controlling Colloidal and Thermo-Responsive Properties of Nano-Objects Prepared Via RAFT Polymerization in a Non-polar Medium

et al. 2023

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After having demonstrated their potential in biomedical applications, thermo-responsive block copolymers that are able to self-assemble into nano-objects in response to temperature modifications are becoming more and more appealing in other sectors, such as the oil and gas and lubricant fields. Reversible addition−fragmentation chain transfer (RAFT) polymerization-induced self-assembly has been demonstrated as a valuable strategy for producing nano-objects from modular block copolymers in non-polar media, required for the mentioned applications. Although the influence of the nature and size of the thermo-responsive block of these copolymers on the properties of the nano-objects is extensively studied in the literature, the role of the solvophilic block is often neglected. In this work, we elucidate the role of the main microstructural parameters, including those of the solvophilic portion, of block copolymers produced by RAFT polymerization in the hydrocarbon blend decane/toluene 50:50 v/v on the thermo-responsive behavior and colloidal properties of the resulting nano-objects. Two long-aliphatic chain monomers were employed for the synthesis of four macromolecular chain transfer agents (macroCTAs), with increasing solvophilicity according to the number of units (n) or length of the alkyl side chain (q). Subsequently, the macroCTAs were chain-extended with different repeating units of di(ethylene glycol) methyl ether methacrylate (p), leading to copolymers that are able to self-assemble below a critical temperature. We show that this cloud point can be tuned by acting on n, p, and q. On the other hand, the colloidal stability, expressed in terms of area of the particle covered by each solvophilic segment, is only a function of n and q, which provides a way for controlling the size distribution of the nano-objects and to decouple it from the cloud point.

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Section: Resultssupporting

confidence: 91%

Role of the Polymer Microstructure in Controlling Colloidal and Thermo-Responsive Properties of Nano-Objects Prepared Via RAFT Polymerization in a Non-polar Medium

et al. 2023

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“…Electrode‐active material determines cell capacity commonly, while the separator between electrodes impacts ion migration routes and hence varies cell dynamics and performances. An even porous construction with better permeability endows the separator with more fluid ion migration channels, which weakens internal resistance and heightens cell capacity 51–54 . Especially, P‐100 presents discharge capacities of 127.6, 114.5, 93.5 and 54.3 mAh g −1 at 1, 2, 4 and 8 C, still remaining at 49.3 mAh g −1 after the fifth cycle at 8 C. While P‐110 with less uniform pores shows a capacity of 23.3 mAh g −1 at 8 C for the first cycle and rapidly drops to a meaningless capacity of 12.3 mAh g −1 for the fifth cycle.…”

Section: Resultsmentioning

confidence: 99%

Dependence of lithium‐ion battery separator porous structure and performance on synchronous bidirectional drawing process regulation of β‐crystal polypropylene

Ding,

Li,

Zhang

et al. 2023

Polymer International

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Uneven separator porous construction inevitably raises lithium‐ion migration barriers within the separator and thus limits overall lithium‐ion battery (LIB) performances. In this research, serial LIB separators with various porous constructions are prepared precisely by adjusting the synchronous bidirectional drawing temperatures to confirm the bidirectional drawing modes determined porous constructions and subsequent mechanical properties, thermal stability, and electrochemical properties of separators. Crystal structure analyses, porous construction diagnoses, mechanical property characterizations, and electrochemical tests reveal the competitive relationship between lamellae slip and separation during the synchronous bidirectional drawing process. Lamellae slip weakens at lower drawing temperatures, enhancing lamellae separation and molecular chain rupture within amorphous regions. Therefore, separator with broken fibrils presents optimized permeability and smoothed ion migration channels, but inferior mechanical properties and thermal stability. Excessive temperature highlights lamellae slip, which damages the pore‐forming process, worsens separator permeability, and rises ion migration resistance. Proper drawing temperature of 100°C maximally balances lamellae slip and separation behaviors, retains intact fibrils and homogenized porous construction, which endows the separator with strengthened mechanical properties, isotropic thermal stability, and optimized electrochemical performances. This study provides new insights for synchronous bidirectional drawing in the practical separator fabrication and clarifies separator structure‐chemical determined LIB performances.This article is protected by copyright. All rights reserved.

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“…32 An application of thermoresponsive polymers in ATPS is in molecular separation in order to retrieve the utilised polymers after the separation task is finished. 33,34 For example, Akashi and coworkers developed an ATPS based on poly( N -isopropylacrylamide) (PNIPAM) and poly( N -vinylisobutyramide) for improved partitioning of myoglobin. 35 Cao and coworkers designed an ATPS from two thermoresponsive polymers for the use of partitioning of antibiotics and subsequent recycling of the polymers.…”

Section: Introductionmentioning

confidence: 99%

Thermoresponsive behaviour of poly(N,N-diethylacrylamide) in aqueous two-phase systems

Bayliss,

Yilmaz,

Plucinski

et al. 2023

Polym. Chem.

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Thermo-responsive polymers and advances in their applications in separation science

Cited by 14 publications

References 106 publications

Role of the Polymer Microstructure in Controlling Colloidal and Thermo-Responsive Properties of Nano-Objects Prepared Via RAFT Polymerization in a Non-polar Medium

Role of the Polymer Microstructure in Controlling Colloidal and Thermo-Responsive Properties of Nano-Objects Prepared Via RAFT Polymerization in a Non-polar Medium

Dependence of lithium‐ion battery separator porous structure and performance on synchronous bidirectional drawing process regulation of β‐crystal polypropylene

Thermoresponsive behaviour of poly(N,N-diethylacrylamide) in aqueous two-phase systems

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