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 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.

Control of osmotic pressure through CO2-capture and release facilitated by the lower critical solution temperature (LCST) phase transition of acylated branched polyethylenimine

RSC Advances ◽  
2016 ◽  
Vol 6 (32) ◽  
pp. 26526-26530 ◽  
Author(s):  
Jeongseon Park ◽  
Minwoo Noh ◽  
Min Keun Chey ◽  
Yeongbong Mok ◽  
Ji-Hun Seo ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Separation ◽  
Osmotic Pressure ◽  
Co2 Capture ◽  
Low Temperatures ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Low Salt ◽  
Branched Polyethylenimine ◽  
Capture And Release

A solution of acylated polyethylenimine absorbs CO2 at low temperatures and draws water from high-salt saline due to the high osmotic pressure, while it liberates CO2 after phase separation by mild heating and releases water into low-salt saline.

scholarly journals Precise Synthesis and Thermoresponsive Property of Poly(ethyl glycidyl ether) and Its Block and Statistic Copolymers with Poly(glycidol)

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3873
Author(s):  
Tingyu He ◽  
Yanqiu Wang ◽  
Atsushi Narumi ◽  
Liang Xu ◽  
Shin-ichiro Sato ◽  
...  
Keyword(s):  
Phase Transition ◽  
Glycidyl Ether ◽  
Solution Temperature ◽  
Multiblock Copolymers ◽  
Phase Transition Behavior ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature ◽  
Protective Groups ◽  
Pentablock Copolymers ◽  
Comprehensive Study

In this paper, we describe a comprehensive study of the thermoresponsive properties of statistic copolymers and multiblock copolymers synthesized by poly(glycidol)s (PG) and poly(ethyl glycidyl ether) (PEGE) with different copolymerization methods. These copolymers were first synthesized by ring-opening polymerization (ROP), which was initiated by tert-butylbenzyl alcohol (tBBA) and 1-tert-butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)phosphoranylidenamino]-2Λ5,4Λ5-catenadi(phosphazene) (t-Bu-P4) as the catalyst, and then the inherent protective groups were removed to obtain the copolymers without any specific chain end groups. The thermoresponsive property of the statistic copolymer PGx-stat-PEGEy was compared with the diblock copolymer PGx-b-PEGEy, and the triblock copolymers were compared with the pentablock copolymers. Among them, PG-stat-PEGE, PG-b-PEGE-b-PG-b-PEGE-b-PG, and PEGE-b-PG-b-PEGE-b-PG-b-PEGE, and even the specific ratio of PEGE-b-PG-b-PEGE, exhibited LCST-type phase transitions in water, which were characterized by cloud point (Tcp). Although the ratio of x to y affected the value of the Tcp of PGx-stat-PEGEy, we found that the disorder of the copolymer has a decisive effect on the phase-transition behavior. The phase-transition behaviors of PG-b-PEGE, part of PEGE-b-PG-b-PEGE, and PG-b-PEGE-b-PG copolymers in water present a two-stage phase transition, that is, firstly LCST-type and then the upper critical solution temperature (UCST)-like phase transition. In addition, we have extended the research on the thermoresponsive properties of EGE homopolymers without specific α-chain ends.

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.

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

Amphoteric Statistical Copolymers with Well-controlled Structure and Upper Critical Solution Temperature in Aqueous Solutions

2020 ◽  
Vol 49 (12) ◽  
pp. 1443-1446
Author(s):  
Komol Kanta Sharker ◽  
Yusuke Shigeta ◽  
Shinji Ozoe ◽  
Shin-ichi Yusa
Keyword(s):  
Aqueous Solutions ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature ◽  
Controlled Structure

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.

scholarly journals Oxazoline-Methacrylate Graft-Copolymers with Upper Critical Solution Temperature Behaviour in Yubase Oil

2021 ◽  
Author(s):  
Matilde Concilio ◽  
Nga Nguyen ◽  
C. Remzi Becer
Keyword(s):  
Aqueous Solutions ◽  
Graft Copolymers ◽  
Solution Temperature ◽  
Temperature Behaviour ◽  
Critical Solution Temperature ◽  
Soluble Polymers ◽  
Upper Critical Solution Temperature ◽  
Fundamental Understanding

Thermoresponsive behavior of polymers in aqueous solutions has been widely studied and utilized in various applications. However, the fundamental understanding on the use of oil soluble polymers in non-aqueous solutions...

Introduction of pH-sensitive upper critical solution temperature (UCST) properties into branched polyethylenimine

Polymer ◽  
2013 ◽  
Vol 54 (20) ◽  
pp. 5338-5344 ◽  
Author(s):  
Minwoo Noh ◽  
Yeongbong Mok ◽  
Daichi Nakayama ◽  
Sangmok Jang ◽  
Seonju Lee ◽  
...  
Keyword(s):  
Ph Sensitive ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature ◽  
Branched Polyethylenimine
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