Sequence length distribution affects the lower critical solution temperature, glass transition temperature, and CO2-responsiveness of N-isopropylacrylamide/methacrylic acid copolymers

Polymer ◽  
2018 ◽  
Vol 143 ◽  
pp. 258-270 ◽  
Author(s):  
Yeong-Tarng Shieh ◽  
Pei-Yi Lin ◽  
Shiao-Wei Kuo
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methacrylic Acid ◽  
Lower Critical Solution Temperature ◽  
Length Distribution ◽  
Solution Temperature ◽  
Sequence Length ◽  
Critical Solution Temperature ◽  
Methacrylic Acid Copolymers

Effects of sequence length distribution on heat capacity and glass transition temperature of styrene—methyl methacrylate copolymers

Polymer ◽  
1994 ◽  
Vol 35 (17) ◽  
pp. 3698-3702 ◽  
Author(s):  
Hidematsu Suzuki ◽  
Yoshiyuki Nishio ◽  
Noritaka Kimura ◽  
V.B.F. Mathot ◽  
M.F.J. Pijpers ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methyl Methacrylate ◽  
Length Distribution ◽  
Sequence Length ◽  
Methacrylate Copolymers

Phase Separation Behaviors Of Polyimide Blends

1998 ◽  
Vol 511 ◽  
Author(s):  
C. H. Ryu ◽  
Y. C. Bae
Keyword(s):  
Phase Transition ◽  
Molecular Weight ◽  
Glass Transition ◽  
Transition Temperature ◽  
Critical Temperature ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Phase Transition Temperatures ◽  
Phase Behaviors ◽  
System Phase

ABSTRACTWe investigated phase behaviors of polyimide blends such as polyethermide(PEI)/polystyrene(PS), PEI/polyamideimide(PAI), PEI/polyethyleneoxide(PEO), and PAI/PEO systems. Our sample systems exhibited lower critical solution temperature(LCST) phase behaviors. In the PEI/PS system, phase transition occurred near or above the glass transition temperature(Tg) of PS and the critical temperature of the system increased with decreasing molecular weight of PS. For PEI/PAI and PEI/PEO systems, the critical temperature of PEI/PAI system is higher than that of PEI/PEO system. Phase transition temperatures of PAI/PEO systems appeared near or below the melting point of PEO.

Synthesis of Epoxy and Block Oligomer Modified Clay Nanocomposite

2001 ◽  
Vol 703 ◽  
Author(s):  
Kang Hung Chen ◽  
Sze Ming Yang
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methacrylic Acid ◽  
Water Resistance ◽  
Clay Content ◽  
Light Transmittance ◽  
Sodium Ions ◽  
Modified Clay ◽  
Clay Layers

ABSTRACTAcrylic triblock (AxMyBz) and diblock (MyBz) oligomers containing methyl methacrylate (MMA, M), methacrylic acid (MAA, A) and dimethylaminoethyl methacrylate (DMAEMA, B) groups are intercalated into the layers of montmorillonite. The results indicate that the block oligomer lay flatly between the clay layers. ICP analyses of Na+ content indicate no unexchanged sodium ions are left in the intercalated clay.Nanocomposites of epoxy and clay modified with block oligomers were synthesized. Glass transition temperature (Tg) of the nanocomposite is 129.6°C (M18B2424+ modified clay) compared to 84.1°C for the physical mixture of epoxy and unmodified clay. Tg increases with decreasing amount of modified clay. When modified clay content are below 2 phr, Tg higher than 131.7 °C can be obtained. Water resistance and light transmittance of the nanocomposite is also improved over composite of epoxy and unmodified clay.

scholarly journals The Properties of Thermosensitive Zwitterionic Sulfobetaine NIPAM-co-DMAAPS Polymer and the Hydrogels: The Effects of Monomer Concentration on the Transition Temperature and Its Correlation with the Adsorption Behavior

2020 ◽  
Vol 20 (2) ◽  
pp. 324
Author(s):  
Eva Oktavia Ningrum ◽  
Agus Purwanto ◽  
Galuh Chynintya Rosita ◽  
Asep Bagus
Keyword(s):  
Molecular Structure ◽  
Phase Transition ◽  
Transition Temperature ◽  
Lower Critical Solution Temperature ◽  
Monomer Concentration ◽  
Adsorption Behavior ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Adsorption Amount

The properties of N-isopropylacrylamide copolymerized with N,N-dimethyl(acrylamidopropyl)ammonium propane sulfonate [poly(NIPAM-co-DMAAPS)] prepared with various monomer ratios such as transition temperature, molecular structure, viscosity were systematically investigated in water and Zn(NO3)2 solution. Poly(NIPAM-co-DMAAPS) in water and Zn(NO3)2 solution exhibited a phase transition with a lower critical solution temperature (LCST). The higher ratio of NIPAM monomer in poly(NIPAM-co-DMAAPS), the lower the LCST of the polymer. Furthermore, the transition temperature of poly(NIPAM-co-DMAAPS) with a lower NIPAM concentration were not confirmed both in water nor Zn(NO3)2 solution. The more increase the NIPAM concentration used in the preparation, the more increase the polymer viscosity. Moreover, the more increase the adsorption amount of ions onto the gel, the more increase the polymer transmittance as well.

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