Polymeric crown ethers: LCST behavior in water and stimuli-responsiveness

2018 ◽  
Vol 9 (19) ◽  
pp. 2574-2579 ◽  
Author(s):  
Dechun Huang ◽  
Qiao Zhang ◽  
Yan Deng ◽  
Zheng Luo ◽  
Bo Li ◽  
...  
Keyword(s):  
Phase Separation ◽  
Crown Ether ◽  
Crown Ethers ◽  
Vinyl Alcohol ◽  
Solution Temperature ◽  
Poly Vinyl Alcohol ◽  
Critical Solution Temperature ◽  
Lcst Behavior ◽  
Phase Separation Behavior ◽  
Separation Behavior

A crown ether-functionalized poly(vinyl alcohol) (PVA) system shows lower critical solution temperature (LCST) phase separation behavior in water.

Phase separation behavior of poly(vinyl alcohol) solutions in relation to the drawability of films prepared from the solutions

1993 ◽  
Vol 26 (17) ◽  
pp. 4461-4471 ◽  
Author(s):  
Masaru Matsuo ◽  
Mutsuko Kawase ◽  
Yuri Sugiura ◽  
Satomi Takematsu ◽  
Chisako Hara
Keyword(s):  
Phase Separation ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Phase Separation Behavior ◽  
Separation Behavior

scholarly journals Intrinsically disordered proteins access a range of hysteretic phase separation behaviors

2019 ◽  
Vol 5 (10) ◽  
pp. eaax5177 ◽  
Author(s):  
Felipe Garcia Quiroz ◽  
Nan K. Li ◽  
Stefan Roberts ◽  
Patrick Weber ◽  
Michael Dzuricky ◽  
...  
Keyword(s):  
Phase Separation ◽  
Phase Behavior ◽  
Intrinsically Disordered Proteins ◽  
Wide Spectrum ◽  
Disordered Proteins ◽  
Solution Temperature ◽  
Intrinsically Disordered ◽  
Self Assembling ◽  
Phase Separation Behavior ◽  
Separation Behavior

The phase separation behavior of intrinsically disordered proteins (IDPs) is thought of as analogous to that of polymers that undergo equilibrium lower or upper critical solution temperature (LCST and UCST, respectively) phase transition. This view, however, ignores possible nonequilibrium properties of protein assemblies. Here, by studying IDP polymers (IDPPs) composed of repeat motifs that encode LCST or UCST phase behavior, we discovered that IDPs can access a wide spectrum of nonequilibrium, hysteretic phase behaviors. Experimentally and through simulations, we show that hysteresis in IDPPs is tunable and that it emerges through increasingly stable interchain interactions in the insoluble phase. To explore the utility of hysteretic IDPPs, we engineer self-assembling nanostructures with tunable stability. These findings shine light on the rich phase separation behavior of IDPs and illustrate hysteresis as a design parameter to program nonequilibrium phase behavior in self-assembling materials.

Solvents Effect on the Structure and Properties of Thermosensitive Polyurethane/Poly(N-Isopropylacrylamide) Semi-Interpenetrating Polymer Networks

2010 ◽  
Vol 129-131 ◽  
pp. 1166-1170 ◽  
Author(s):  
Hai Ning Lv ◽  
Cheng Qian ◽  
Yuan Xue ◽  
Zai Sheng Cai
Keyword(s):  
Thermoplastic Polyurethane ◽  
Polymer Networks ◽  
Crosslinking Agent ◽  
Interpenetrating Polymer Networks ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Volume Transition ◽  
Surface Contact Angle ◽  
Phase Separation Behavior ◽  
Separation Behavior

poly(N-isopropylacrylamide) (PNIPPAm) is a thermally sensitive polymeric material which exhibits large volume transition at temperatures around its lower critical solution temperature (LCST). To get a thermosensitive semi-Interpenetrating Polymer Networks(semi-IPNs), N- isopropylacrylamide (NIPPAm) was dispersed and synthesized with different crosslinking agent amount in thermoplastic polyurethane(TPU) solution. The resulting films were characterized in terms of swelling ration, surface contact angle, and scanning electron micrograph (SEM). The results showed that filming medium has great affect on the structure and swelling of PU/PNIPPAm composite film and the amount of crosslinking agent influents the miscibility of PU and PNIPPAm. Ethanol as filming medium makes the phase separation behavior of PNIPPAm insignificant in the films.

Phase Separation Behavior of Fusidic Acid and Rifampicin in PLGA Microspheres

2012 ◽  
Vol 9 (5) ◽  
pp. 1489-1501 ◽  
Author(s):  
Samuel E. Gilchrist ◽  
Deborah L. Rickard ◽  
Kevin Letchford ◽  
David Needham ◽  
Helen M. Burt
Keyword(s):  
Phase Separation ◽  
Fusidic Acid ◽  
Plga Microspheres ◽  
Phase Separation Behavior ◽  
Separation Behavior
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