A new thermo-responsive block copolymer with tunable upper critical solution temperature and lower critical solution temperature in the alcohol/water mixture

2013 ◽  
Vol 51 (20) ◽  
pp. 4399-4412 ◽  
Author(s):  
Yang Su ◽  
Meihan Dan ◽  
Xin Xiao ◽  
Xiaohui Wang ◽  
Wangqing Zhang
Keyword(s):  
Block Copolymer ◽  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Water Mixture ◽  
Critical Solution Temperature ◽  
Alcohol Water ◽  
Upper Critical Solution Temperature

Polymer Fractionation at a Lower Critical Solution Temperature Phase Boundary

1967 ◽  
Vol 40 (5) ◽  
pp. 1544-1552
Author(s):  
C. H. Baker ◽  
C. S. Clemson ◽  
G. Allen
Keyword(s):  
Molecular Weight ◽  
Phase Boundary ◽  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Temperature Phase ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature ◽  
Two Samples ◽  
Polymer Fractionation ◽  
Molecular Weight Fractions

Abstract The influence of pressure on a lower critical solution temperature is much more pronounced than on an upper critical solution temperature. Accordingly it is possible to control phase separation at a LCST phase boundary under isothermal conditions by merely adjusting the pressure on the system. An apparatus has been constructed to investigate the isothermal fractionation of polyisobutene in which precipitation is controlled by pressure. Two samples of polyisobutene of Mv=1.76×106 and 9.0×104 have been fractionated in isopentane solution so as to yield up to six and nine fractions respectively. The integral molecular weight distribution curves thus obtained are compared with those obtained from conventional fractionations at an UCST. The sensitivity of the method is poor with regard to the separation of low molecular weight fractions and degradation occurs at the higher temperatures to an appreciable extent.

Zwitterionic poly(sulfobetaine methacrylate)s in water: from upper critical solution temperature (UCST) to lower critical solution temperature (LCST) with increasing length of one alkyl substituent on the nitrogen atom

2018 ◽  
Vol 9 (43) ◽  
pp. 5257-5261 ◽  
Author(s):  
Ning Wang ◽  
Bryan T. Seymour ◽  
Evan M. Lewoczko ◽  
Ethan W. Kent ◽  
Ming-Li Chen ◽  
...  
Keyword(s):  
Nitrogen Atom ◽  
Lower Critical Solution Temperature ◽  
Alkyl Substituent ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Upper Critical Solution Temperature ◽  
Alkyl Length

Increasing the alkyl length on nitrogen of the polymer changes behaviour from UCST, to soluble, LCST, and insoluble.

Anthracene functionalized thermosensitive and UV-crosslinkable polymeric micelles

2015 ◽  
Vol 6 (11) ◽  
pp. 2048-2053 ◽  
Author(s):  
Yang Shi ◽  
Renata M. Cardoso ◽  
Cornelus F. van Nostrum ◽  
Wim E. Hennink
Keyword(s):  
Aqueous Solution ◽  
Block Copolymer ◽  
Lower Critical Solution Temperature ◽  
Polymeric Micelles ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Uv Illumination ◽  
Uv Lamp

An anthracene-functionalized thermosensitive block copolymer was synthesized, which formed micelles by heating its aqueous solution above the lower critical solution temperature (LCST). The micelles were subsequently crosslinked by UV illumination at 365 nm with a normal handheld UV lamp.

scholarly journals Designing the thermal behaviour of aqueous biphasic systems composed of ammonium-based zwitterions

2017 ◽  
Vol 19 (17) ◽  
pp. 4012-4016 ◽  
Author(s):  
Ana M. Ferreira ◽  
Helena Passos ◽  
Akiyoshi Okafuji ◽  
Mara G. Freire ◽  
João A. P. Coutinho ◽  
...  
Keyword(s):  
Thermal Behaviour ◽  
Lower Critical Solution Temperature ◽  
Water Soluble ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Aqueous Biphasic Systems ◽  
Upper Critical Solution Temperature ◽  
Aqueous Biphasic ◽  
Biphasic Systems

The design of the thermal behaviour – from an upper critical solution temperature (UCST) to a lower critical solution temperature (LCST) – of aqueous biphasic systems composed of water-soluble ammonium-based zwitterions.

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