scholarly journals How to manipulate the upper critical solution temperature (UCST)?

2017 ◽  
Vol 8 (1) ◽  
pp. 220-232 ◽  
Author(s):  
Jukka Niskanen ◽  
Heikki Tenhu
Keyword(s):  
Aqueous Solutions ◽  
Solution Temperature ◽  
Stimuli Responsive ◽  
Critical Solution Temperature ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers ◽  
Ph Influence ◽  
Counter Ions ◽  
Upper Critical Solution Temperature

In this mini-review, we discuss multi-stimuli-responsive polymers, which exhibit upper critical solution temperature (UCST) behavior mainly in aqueous solutions, and focus on examples where counter ions, electricity, light, or pH influence the thermoresponsiveness of these polymers.

Redox-controlled upper critical solution temperature behaviour of a nitroxide containing polymer in alcohol–water mixtures

2016 ◽  
Vol 7 (5) ◽  
pp. 1088-1095 ◽  
Author(s):  
Olivier Bertrand ◽  
Alexandru Vlad ◽  
Richard Hoogenboom ◽  
Jean-François Gohy
Keyword(s):  
Solution Temperature ◽  
Stimuli Responsive ◽  
Temperature Behaviour ◽  
Critical Solution Temperature ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers ◽  
Alcohol Water ◽  
Upper Critical Solution Temperature

Research on stimuli responsive polymers builds momentum as nature-inspired applications using man-made materials are increasingly sought.

scholarly journals Thermo- and Photoresponsive Behaviors of Dual-Stimuli-Responsive Organogels Consisting of Homopolymers of Coumarin-Containing Methacrylate

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 329
Author(s):  
Seidai Okada ◽  
Eriko Sato
Keyword(s):  
Functional Group ◽  
Solution Temperature ◽  
Stimuli Responsive ◽  
Critical Solution Temperature ◽  
Equilibrium Degree ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers ◽  
Dual Functional ◽  
Wide Range ◽  
Increasing Temperature

Coumarin-containing vinyl homopolymers, such as poly(7-methacryloyloxycoumarin) (P1a) and poly(7-(2′-methacryloyloxyethoxy)coumarin) (P1b), show a lower critical solution temperature (LCST) in chloroform, which can be controlled by the [2 + 2] photochemical cycloaddition of the coumarin moiety, and they are recognized as monofunctional dual-stimuli-responsive polymers. A single functional group of monofunctional dual-stimuli-responsive polymers responds to dual stimuli and can be introduced more uniformly and densely than those of dual-functional dual-stimuli-responsive polymers. In this study, considering a wide range of applications, organogels consisting of P1a and P1b, i.e., P1a-gel and P1b-gel, respectively, were synthesized, and their thermo- and photoresponsive behaviors in chloroform were investigated in detail. P1a-gel and P1b-gel in a swollen state (transparent) exhibited phase separation (turbid) through a temperature jump and reached a shrunken state (transparent), i.e., an equilibrium state, over time. Moreover, the equilibrium degree of swelling decreased non-linearly with increasing temperature. Furthermore, different thermoresponsive sites were photopatterned on the organogel through the photodimerization of the coumarin unit. The organogels consisting of homopolymers of coumarin-containing methacrylate exhibited unique thermo- and photoresponsivities and behaved as monofunctional dual-stimuli-responsive organogels.

scholarly journals Effects of the Hydrophilic–Lipophilic Balance of Alternating Peptides on Self-Assembly and Thermo-Responsive Behaviors

2019 ◽  
Vol 20 (18) ◽  
pp. 4604 ◽  
Author(s):  
Ihsan ◽  
Nargis ◽  
Koyama
Keyword(s):  
Aqueous Solutions ◽  
Self Assembly ◽  
Polymer Chains ◽  
Systematic Evaluation ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Hydrophilic Lipophilic Balance ◽  
Upper Critical Solution Temperature ◽  
Cloud Points ◽  
Micellization Behavior

A series of N-substituted poly(Gly–alter–Val) peptides were successfully synthesized for the systematic evaluation of the micellization behavior of alternating peptides. Three-component polymerization employing an aldehyde, a primary ammonium chloride, and potassium isocyanoacetate afforded four alternating peptides in excellent yields. We investigated the dependence of the hydrophilic–lipophilic balance of alternating peptides on the micellization behavior. All the aqueous solutions of alternating peptides exhibited upper critical solution temperature (UCST) behaviors, strongly indicating that the alternating binary pattern would mainly contribute to the UCST behaviors. The cloud points of alternating peptides shifted to higher temperatures as the side chains became more hydrophilic, which is opposite to the trend of typical surfactants. Such unusual micellization behaviors appeared to be dependent on the quasi-stable structure of single polymer chains formed in water.

scholarly journals Upper Critical Solution Temperature Behavior of pH-Responsive Amphoteric Statistical Copolymers in Aqueous Solutions

ACS Omega ◽  
2021 ◽  
Vol 6 (13) ◽  
pp. 9153-9163
Author(s):  
Komol Kanta Sharker ◽  
Yusuke Shigeta ◽  
Shinji Ozoe ◽  
Panittha Damsongsang ◽  
Voravee P. Hoven ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Temperature Behavior ◽  
Solution Temperature ◽  
Ph Responsive ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature

scholarly journals Advances in thermo-responsive polymers exhibiting upper critical solution temperature (UCST)

2019 ◽  
Vol 13 (11) ◽  
pp. 974-992 ◽  
Author(s):  
K. K. Bansal ◽  
P. K. Upadhyay ◽  
G. K. Saraogi ◽  
A. Rosling ◽  
J. M. Rosenholm
Keyword(s):  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Responsive Polymers ◽  
Upper Critical Solution Temperature

Upper critical solution temperature (UCST) phase transition of halide salts of branched polyethylenimine and methylated branched polyethylenimine in aqueous solutions

2016 ◽  
Vol 52 (3) ◽  
pp. 509-512 ◽  
Author(s):  
Minwoo Noh ◽  
Sunah Kang ◽  
Yeongbong Mok ◽  
So Jung Choi ◽  
Jeongseon Park ◽  
...  
Keyword(s):  
Phase Transition ◽  
Aqueous Solutions ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature ◽  
Branched Polyethylenimine ◽  
Halide Salts

Halide salts of branched polyethylenimine (b-PEI) and methylated b-PEI exhibited UCST phase transition in aqueous solutions.

scholarly journals Synthesis and Aggregation Behavior of Temperature- and pH-Responsive Glycopolymers as Sugar-Displaying Conjugates

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 956 ◽  
Author(s):  
Sotaro Tsuji ◽  
Tomohiro Aoki ◽  
Shunsuke Ushio ◽  
Tomonari Tanaka
Keyword(s):  
Aqueous Media ◽  
Temperature Limit ◽  
Radical Copolymerization ◽  
Advanced Materials ◽  
Solution Temperature ◽  
Stimuli Responsive ◽  
Ph Responsive ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers ◽  
Hydrolysis Of

Stimuli-responsive polymers have attracted significant interest in the fields of advanced materials and biomaterials. Herein, temperature- and pH-responsive glycopolymers, which are composed of N-isopropylacrylamide, methacrylic acid, and an acrylamide derivative bearing a lactose moiety, were synthesized via radical copolymerization. The series of resulting glycopolymers had different degrees of substitution of the lactose moieties, were responsive to temperatures between 26.6 °C and 47.6 °C, and formed aggregates above the lower critical solution temperature limit in mild acidic aqueous media (pH 4–6). The temperature-responsive behavior was dependent on the prevailing pH conditions, as no aggregation was observed in neutral and basic aqueous media (pH > 7). The aggregates had saccharide moieties on the surface in aqueous media. The number of saccharide moieties on the surface depended on the saccharide-containing unit ratio in the glycopolymer. The ratio was determined via enzymatic hydrolysis of the lactose moieties using β-galactosidase and the subsequent detection of the released galactose.

Preparation and thermoresponsive properties of helical polypeptides bearing pyridinium salts

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 40772-40778 ◽  
Author(s):  
Yan Wu ◽  
Xi Wang ◽  
Ying Ling ◽  
Haoyu Tang
Keyword(s):  
Ion Exchange ◽  
Aqueous Solutions ◽  
Exchange Reaction ◽  
Solution Temperature ◽  
Pyridinium Salts ◽  
Critical Solution Temperature ◽  
Ion Exchange Reaction ◽  
Upper Critical Solution Temperature

Polypeptides bearing 3-methylpyridinium groups and BF4− prepared by nuleophilic substitution and ion-exchange reaction showed upper critical solution temperature (UCST)-type transitions in aqueous solutions.

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