Thermo-responsive ABA triblock copolymer of PVEA-b-PNIPAM-b-PVEA showing solvent-tunable LCST in a methanol–water mixture

Li, Shentong; Su, Yang; Dan, Meihan; Zhang, Wangqing

doi:10.1039/c3py01219k

Cited by 36 publications

(34 citation statements)

References 72 publications

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“…In this case, the pH-triggered supramolecular self-assembly occurred at lower pH. This is in accordance with early reports that the lower critical solution temperature (LCST) of poly( N -isopropylacrylamide)(PNIPAM) based copolymers can be controlled by changing the hydrophobic chain length 32–34 .…”

Section: Resultssupporting

confidence: 91%

Non-covalent interactions in controlling pH-responsive behaviors of self-assembled nanosystems

Wang

et al. 2016

Polym. Chem.

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Self-assembly and associated dynamic and reversible non-covalent interactions are the basis of protein biochemistry (e.g., protein folding) and development of sophisticated nanomaterial systems that can respond to and amplify biological signals. In this study, we report a systematic investigation of non-covalent interactions that affect the pH responsive behaviors and resulting supramolecular self-assembly of a series of ultra-pH sensitive (UPS) block copolymers. Increase of hydrophobic and π-π stacking interactions led to the decrease of pKa values. In contrast, enhancement of direct ionic binding between cationic ammonium groups and anionic counter ions gave rise to increased pKa. Moreover, hydration of hydrophobic surfaces and hydrogen bonding interactions may also play a role in the self-assembly process. The key parameters capable of controlling the subtle interplay of different non-covalent bonds in pH-triggered self-assembly of UPS copolymers are likely to offer molecular insights to understand other stimuli-responsive nanosystems. Selective and precise implementation of non-covalent interactions in stimuli-responsive self-assembly processes will provide powerful and versatile tools for the development of dynamic, complex nanostructures with predictable and tunable transitions.

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Section: Resultssupporting

confidence: 91%

Non-covalent interactions in controlling pH-responsive behaviors of self-assembled nanosystems

Wang

et al. 2016

Polym. Chem.

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“…As discussed previously, PVEA exhibited the soluble‐to‐insoluble ‐ transition in methanol or in the methanol/water mixture at temperature above LCST. The thermoresponse of the synthesized PDMA 66 ‐ b ‐PVEA 60 ‐TTC diblock copolymer in the methanol/water mixture with different methanol content was checked.…”

Section: Resultssupporting

confidence: 65%

“…In recent studies, we have reported a new thermoresponsive polymer based on poly[ N ‐(4‐vinylbenzyl)‐ N , N ‐diethylamine] (PVEA), which shows the LCST‐type ‐ transition in alcohol or in the alcohol/water mixture, and therefore has the potential to be employed in dispersion RAFT polymerization in alcoholic solvent. With the aim to shorten the induction time in dispersion RAFT polymerization and to prepare thermoresponsive ABC triblock copolymer nano‐objects, herein a thermoresponsive diblock copolymer of poly( N , N ‐dimethylacrylamide)‐ block ‐poly[ N ‐(4‐vinylbenzyl)‐ N , N ‐diethylamine] trithiocarbonate (PDMA‐ b ‐PVEA‐TTC, in which PDMA is solvophilic, PVEA is thermoresponsive, and TTC represents the RAFT terminal of trithiocarbonate), is synthesized, and its micellar macro‐RAFT agent‐mediated dispersion RAFT polymerization of styrene in the methanol/water mixture is checked.…”

Section: Introductionmentioning

confidence: 99%

Thermoresponsive diblock copolymer micellar macro-RAFT agent-mediated dispersion RAFT polymerization and synthesis of temperature-sensitive ABC triblock copolymer nanoparticles

Gao

Cui

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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The micellar macro-RAFT agent-mediated dispersion polymerization of styrene in the methanol/water mixture is performed and synthesis of temperature-sensitive ABC triblock copolymer nanoparticles is investigated. The thermoresponsive diblock copolymer of poly(N,N-dimethylacrylamide)block-poly[N-(4-vinylbenzyl)-N,N-diethylamine] trithiocarbonate forms micelles in the polymerization solvent at the polymerization temperature and, therefore, the dispersion RAFT polymerization undergoes as similarly as seeded dispersion polymerization with accelerated polymerization rate. With the progress of the RAFT polymerization, the molecular weight of the synthesized triblock copolymer of poly(N,N-dimethylacrylamide)-block-poly[N-(4-vinylbenzyl)-N,N-diethylamine]-b-polystyrene linearly increases with the monomer conversion, and the PDI values of the triblock copolymers are below 1.2. The disper-sion RAFT polymerization affords the in situ synthesis of the triblock copolymer nanoparticles, and the mean diameter of the triblock copolymer nanoparticles increases with the polymerization degree of the polystyrene block. The triblock copolymer nanoparticles contain a central thermoresponsive poly [N-(4-vinylbenzyl)-N,N-diethylamine] block, and the soluble-toinsoluble phase-transition temperature is dependent on the methanol content in the methanol/water mixture.

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“…prepared solvent‐tunable temperature‐responsive poly[ N ‐(4‐vinylbenzyl)‐ N , N ‐diethylamine]‐ block ‐poly( N ‐isopropylacrylamide)‐ block ‐poly[ N ‐(4‐vinylbenzyl)‐ N , N ‐diethylamine] triblock copolymers with different lengths of blocks. Poly( N ‐isopropylacrylamide) block of the temperature‐responsive triblock copolymers represented an LCST in a water‐rich methanol–water solution, while poly[ N ‐(4‐vinylbenzyl)‐ N , N ‐diethylamine] block exhibited another LCST in a methanol‐rich methanol–water solution . Ha and coworkers synthesized copolymers of N ‐isopropylacrylamide and N ‐(2‐hydroxypropyl) methacrylamide (HPMA) by reversible addition–fragmentation chain transfer polymerization.…”

Section: Introductionmentioning

confidence: 99%

A temperature‐responsive polyurethane film with reversible visible light transmittance change and constant low UV light transmittance

Xiao

Liu

et al. 2018

J of Applied Polymer Sci

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We prepared a temperature-responsive polyurethane (PU) film with reversible visible light transmittance change, which was opaque at room temperature and became transparent when the temperature rised. The PU film has very low visible light transmittance of 1.4% at room temperature. At 45 C, the PU film has relatively high transmittance of 66.7% looking translucent. When the temperature goes to 50 C or above, the transmittance is more than 80% and the PU film is transparent. The reason for this interesting phenomenon about visible light transmittance change was illustrated by polarizing optical microscope and differential scanning calorimetry. While ultraviolet light transmittance of the PU film is very low at all time. Moreover, this PU film has excellent mechanical performance in a wide temperature range. We suppose this PU film has potential applications in many fields such as tunable optical devices or coating materials with smart temperature responsivity.

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Thermo-responsive ABA triblock copolymer of PVEA-b-PNIPAM-b-PVEA showing solvent-tunable LCST in a methanol–water mixture

Cited by 36 publications

References 72 publications

Non-covalent interactions in controlling pH-responsive behaviors of self-assembled nanosystems

Non-covalent interactions in controlling pH-responsive behaviors of self-assembled nanosystems

Thermoresponsive diblock copolymer micellar macro-RAFT agent-mediated dispersion RAFT polymerization and synthesis of temperature-sensitive ABC triblock copolymer nanoparticles

A temperature‐responsive polyurethane film with reversible visible light transmittance change and constant low UV light transmittance

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