Lower critical solution temperature sensitivity to structural changes in poly( N ‐isopropyl acrylamide) homopolymers

2019 ◽  
Vol 57 (20) ◽  
pp. 1386-1393 ◽  
Author(s):  
Alberto García‐Peñas ◽  
Yu Wang ◽  
Alexandra Muñoz‐Bonilla ◽  
Marta Fernández‐García ◽  
Florian J. Stadler
Keyword(s):  
Temperature Sensitivity ◽  
Lower Critical Solution Temperature ◽  
Structural Changes ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Isopropyl Acrylamide

scholarly journals Upper or lower critical solution temperature, or both? Studies on cationic copolymers of N-isopropylacrylamide

2015 ◽  
Vol 6 (16) ◽  
pp. 3074-3082 ◽  
Author(s):  
Erno Karjalainen ◽  
Vladimir Aseyev ◽  
Heikki Tenhu
Keyword(s):  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Trimethylammonium Chloride ◽  
Solution Properties ◽  
Critical Solution Temperature ◽  
Isopropyl Acrylamide ◽  
Cationic Copolymers

The solution properties of statistical copolymers of N-isopropyl acrylamide (NIPAm) and cationic (3-acrylamidopropyl) trimethylammonium chloride (AMPTMA) have been studied.

scholarly journals Conformational Stability of Poly (N-Isopropylacrylamide) Anchored on the Surface of Gold Nanoparticles

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 443
Author(s):  
Runmei Li ◽  
Cong Cheng ◽  
Zhuorui Wang ◽  
Xuefan Gu ◽  
Caixia Zhang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Temperature Sensitivity ◽  
Electrostatic Interaction ◽  
Strong Interaction ◽  
Lower Critical Solution Temperature ◽  
Conformational Stability ◽  
Solution Temperature ◽  
Temperature Sensitive ◽  
Critical Solution Temperature ◽  
Temperature Variations

To verify the temperature sensitive failure of poly (N-isopropylacrylamide) (PNIPAM) anchored on the surface of gold nanoparticles (AuNPs), the UV-Vis spectra with temperature variations of the following aqueous solutions respectively containing AuNPs-PNIPAM, Au-PNIPAM/PNIPAM, PNIPAM, in different media (including salt, ethanol, HCl and cetyltrimethylammoniumbromide (CTAB)), were systematically determined. The results indicated that the UV-Vis spectrum of AuNPs-PNIPAM suspension hardly changed even above the Lower Critical Solution Temperature (LCST) of PNIPAM, but that of Au-PNIPAM/PNIPAM sharply increased only in absorbance intensity. A possible mechanism of the failed temperature sensitivity of PNIPAM anchored on the surface of AuNPs was proposed. Being different from free PNIPAM molecules, a strong interaction exists among PNIPAM molecules anchored on the surface of AuNPs, restraining the change in conformation of PNIPAM. The temperature sensitivity of Au-PNIPAM/PNIPAM originates from the free PNIPAM molecules rather than the anchored PNIPAM one. The changing electrostatic interaction could effectively regulate the aggregation behavior of AuNPs-PNIPAM and enhance its sensitivity to temperature.

scholarly journals Highly-branched poly(N-isopropyl acrylamide)s with core–shell morphology below the lower critical solution temperature

RSC Advances ◽  
2014 ◽  
Vol 4 (92) ◽  
pp. 50932-50937 ◽  
Author(s):  
Richard Plenderleith ◽  
Thomas Swift ◽  
Stephen Rimmer
Keyword(s):  
Lower Critical Solution Temperature ◽  
Shell Morphology ◽  
Solution Temperature ◽  
Core Shell ◽  
Critical Solution Temperature ◽  
Degree Of Branching ◽  
Isopropyl Acrylamide ◽  
Pass Through

Dilute poly(N-isopropyl acrylamide)s pass through a coil-to-globule transitions. Some hyperbranched compositions have biphasic core–shell morphologies with globular cores and open coil shells dependent on the degree of branching.

A polyelectrolyte-containing copolymer with a gas-switchable lower critical solution temperature-type phase transition

2019 ◽  
Vol 10 (2) ◽  
pp. 260-266 ◽  
Author(s):  
Jin-Jin Li ◽  
Yin-Ning Zhou ◽  
Zheng-Hong Luo ◽  
Shiping Zhu
Keyword(s):  
Phase Transition ◽  
Cloud Point ◽  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Type Phase

A polyelectrolyte-containing copolymer with a CO2/N2-switchable cloud point, resulting from the gas-induced alternation of hydrophilicity, was prepared.

Sign in / Sign up

Export Citation Format

Share Document