Temperature-Sensitive Nanogels PNIPAAm/DMA Prepared and Research

2012 ◽  
Vol 465 ◽  
pp. 141-145
Author(s):  
Hai Yan Wang ◽  
Qian Liao ◽  
Qiao Lan Shao ◽  
Gao Qiu ◽  
Xi Hua Lu
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Synthesis And Characterization ◽  
Temperature Sensitive ◽  
Volume Phase Transition ◽  
Volume Phase ◽  
New Class ◽  
Copolymer Gels ◽  
Temperature Controlled

There have much study about thermo-responsive nanogels,which exhibit temperature-controlled volume phase transitions.There have been few reports,however,of electrostatically neutral,thermosensitive nanogels with a high composition of hydrophilic monomer.Here,we describe the synthesis and characterization of a new class of nonionic copolymer nanogels based on N-ispropylacrylamide(NIPAM) and N,N-dimethylacrylamide(DMA),wich exhibit tunable volume phase transition temperatures.And increasing percentages of DMA in copolymer gels raises the LCST,and attenuates and broadens the volume phases transition.Through DLS, AFM and UV-Vis measurement it's size,shape and VPTTs.The character of nonionic NIPAM/DMA nanogels show it's tunable phase transitions promise to be useful for applicatipns in biotechnology and medicine.

Synthesis and characterization of CO2-sensitive temperature-responsive catalytic poly(ionic liquid) microgels

2018 ◽  
Vol 9 (21) ◽  
pp. 2887-2896 ◽  
Author(s):  
Shoumin Chen ◽  
Xuezhen Lin ◽  
Zhenghao Zhai ◽  
Ruyue Lan ◽  
Jin Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Synthesis And Characterization ◽  
Volume Phase Transition ◽  
Phase Transition Behavior ◽  
Volume Phase ◽  
Temperature Responsive ◽  
Transition Behavior ◽  
Poly Ionic Liquid

A class of poly(ionic liquid) microgels exhibiting CO2-switchable temperature-responsive volume phase transition behavior have been synthesized and used for CO2 fixation.

Volume phase transition induced by temperature sensitive DL-amino acid methyl ester side chain based copolymer gels

2000 ◽  
Vol 3 (3) ◽  
pp. 381-387 ◽  
Author(s):  
Akihiro Hiroki ◽  
Hideaki Iwakami ◽  
Masaru Yoshida ◽  
Takeshi Suwa ◽  
Masaharu Asano ◽  
...  
Keyword(s):  
Phase Transition ◽  
Amino Acid ◽  
Methyl Ester ◽  
Acid Methyl Ester ◽  
Side Chain ◽  
Temperature Sensitive ◽  
Volume Phase Transition ◽  
Volume Phase ◽  
Acid Methyl ◽  
Amino Acid Methyl Ester

scholarly journals On Going to a New Era of Microgel Exhibiting Volume Phase Transition

Gels ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 26
Author(s):  
Haruma Kawaguchi
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Transition Temperature ◽  
Structural Analysis ◽  
Research Direction ◽  
Volume Phase Transition ◽  
New Era ◽  
Volume Phase ◽  
The World ◽  
Remarkable Progress

The discovery of phenomena of volume phase transition has had a great impact not only on bulk gels but also on the world of microgels. In particular, research on poly(N-isopropylacrylamide) (PNIPAM) microgels, whose transition temperature is close to body temperature, has made remarkable progress in almost 35 years. This review presents some breakthrough findings in microgels that exhibit volume phase transitions and outlines recent works on the synthesis, structural analysis, and research direction of microgels.

Synthesis and characterization of ammonia-responsive polymer microgels

2015 ◽  
Vol 6 (48) ◽  
pp. 8331-8342 ◽  
Author(s):  
Yahui Peng ◽  
Xiaomei Jiang ◽  
Shoumin Chen ◽  
Qingshi Wu ◽  
Jing Shen ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Synthesis And Characterization ◽  
Sensitive Volume ◽  
Volume Phase ◽  
Highly Sensitive ◽  
Responsive Polymer

We report a polymer microgel that can undergo rapid, reversible, and highly-sensitive volume phase transitions upon varying ammonia concentrations in milieu.

scholarly journals Investigation of the Effects of Different Hydrophilic and Hydrophobic Comonomers on the Volume Phase Transition Temperatures and Thermal Properties of N-Isopropylacrylamide-Based Hydrogels

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Ahmet Okudan ◽  
Abdullah Altay
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Pure Water ◽  
Thermal Analyses ◽  
Temperature Sensitive ◽  
Glass Temperature ◽  
Volume Phase Transition ◽  
Swelling Properties ◽  
Volume Phase ◽  
Swelling Equilibrium

In this work, a series of thermally responsive terpolymers of N-isopropylacrylamide (NIPA) with three different comonomer contents was synthesized, and their swelling behaviour was studied as a function of composition and temperature. Temperature-sensitive, random cross-linked terpolymers of NIPA were prepared from methyl methacrylate (MMA), N-tert-butylacrylamide (NTBA), and acrylic acid (AA) using a free radical polymerization method. In the synthesis of terpolymer hydrogels, N,N-methylene bisacrylamide (BIS) was used as cross-linkers and ammonium persulfate (APS) as initiator. The NIPA content of the monomer feed varied from 80 to 50 mol %, and other comonomer feed varied from 40 to 5 mol %. The swelling equilibrium of these hydrogels was studied as a function of temperature and hydrophobic and hydrophilic comonomer contents. The swelling properties of the polymers were investigated in pure water at temperatures from 10 to 80°C. All of the synthesized gels were found to be sensitive to temperature. Glass transition temperature analyses and thermal analyses of the synthesized hydrogels were studied. The volume phase transition temperature and the swelling equilibrium (r) values of NIPA-based hydrogels synthesized in different feed ratios and in varying monomer contents were found in the range of 17–52°C and 14–51 g H2O/g polymer, respectively. The glass temperature (Tg) of the NIPA/AA/(MMA or NTBA) hydrogels synthesized with feed ratios of 50/40/10 was found to be 133 or 142°C, respectively. The initial and the end degradation that were determined for hydrogels at high temperatures indicated the quite good thermal stability of hydrogels. When the mass loss of the synthesized hydrogels was 50%, the temperatures were measured between 247 and 258°C.

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