Amphiphilic telechelics with polyhedral oligosilsesquioxane (POSS) end-groups: Dilute solution viscometry

Polymer ◽  
2006 ◽  
Vol 47 (17) ◽  
pp. 6202-6207 ◽  
Author(s):  
Byoung-Suhk Kim ◽  
Patrick T. Mather
Keyword(s):  
Dilute Solution ◽  
Polyhedral Oligosilsesquioxane ◽  
End Groups ◽  
Dilute Solution Viscometry

scholarly journals Supramolecular Triblock Copolymers Through the Formation of Hydrogen Bonds: Synthesis, Characterization, Association Effects in Solvents of Different Polarity

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 468
Author(s):  
Spyridoula-Lida Bitsi ◽  
Margarita Droulia ◽  
Marinos Pitsikalis
Keyword(s):  
Hydrogen Bonds ◽  
Triblock Copolymers ◽  
Size Exclusion ◽  
Hydroxyl Groups ◽  
Dilute Solution ◽  
Scanning Calorimetry ◽  
End Groups ◽  
Exclusion Chromatography ◽  
Dilute Solution Viscometry ◽  
Differential Thermogravimetry

Anionic polymerization techniques were employed for the synthesis of linear polystyrene (PS) and block copolymer of PS and polyisoprene (PI) PS-b-PI bearing end hydroxyl groups. Following suitable organic chemistry transformation, the –OH end groups were converted to moieties able to form complementary hydrogen bonds including 2,6-diaminopurine, Dap, thymine, Thy, and the so-called Hamilton receptor, Ham. The formation of hydrogen bonds was examined between the polymers PS-Dap and PS-b-PI-Thy, along with the polymers PS-Ham and PS-b-PI-Thy. The conditions under which supramolecular triblock copolymers are formed and the possibility to form aggregates were examined both in solution and in the solid state using a variety of techniques such as 1H-NMR spectroscopy, size exclusion chromatography (SEC), dilute solution viscometry, dynamic light scattering (DLS), thermogravimetric analysis (TGA), differential thermogravimetry (DTG), and differential scanning calorimetry (DSC).

Miscibility Study of Polymer Blends Composed of Polyethylenimine, Polyethyleneglycol, and Carboxymethyl Chitosan

2011 ◽  
Vol 284-286 ◽  
pp. 1707-1712 ◽  
Author(s):  
Yong Sheng Chen ◽  
Jiang Nan Shen ◽  
Jun Hong Qiu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Polymer Blends ◽  
Carboxymethyl Chitosan ◽  
Dilute Solution ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
Ternary Polymer ◽  
Dilute Solution Viscometry ◽  
Scanning Electron

Miscibility of ternary polymer blends composed of poly(ethyleneimine) (PEI), poly(ethylene glycol) (PEG), and carboxymethyl chitosan (CMCS) was investigated by dilute-solution viscometry, FTIR spectrum, and scanning electron microscope (SEM) techniques. The results of these measurements indicate that PEG is immiscible in the ternary CMCS/PEI/PEG polymer blend.

Dilute solution viscometry study on the miscibility of N,O-carboxymethyl chitosan-cellulose acetate blends

2011 ◽  
Vol 31 (4) ◽  
Author(s):  
Alka G. Boricha ◽  
Zagabathuni Venkata Panchakshari Murthy
Keyword(s):  
Cellulose Acetate ◽  
Thermodynamic Parameter ◽  
Polymer System ◽  
Solvent System ◽  
Carboxymethyl Chitosan ◽  
Dilute Solution ◽  
Polymer Sample ◽  
Reduced Viscosity ◽  
Viscosity Behavior ◽  
Dilute Solution Viscometry

Abstract Dilute solution viscometry method is used for studying viscosity behavior of newly prepared N,O-carboxymethyl chitosan (NOCC), cellulose acetate (CA), and their blends at different compositions (0/10, 2/8, 4/6, 5/5, 6/4, 8/2, 10/0). In this method, reduced viscosity (η sp/c) and inherent viscosity (ln η rel/c) of the given polymer sample have been determined by measuring the flow time of the polymer sample in acetone solvent. Huggins (k) and Kraemer coefficients (k′) for given polymer-solvent system are calculated from the extrapolation of plots (η sp/c) versus(c) and (ln η rel/c) versus(c). The miscibility of this polymer system is determined using different criteria such as Δb, Δb′, , interaction parameter Δ[η], thermodynamic parameter α, and modified thermodynamic parameter β. Based on the positive or negative sign of this criteria, miscibility of the polymer system is investigated. The results of the dilute solution viscometry method suggested that the NOCC/CA blends are miscible at the compositions range of 4/6, 5/5, 6/4, and 8/2 and completely immiscible at the 2/8 composition. The results are also supported by Fourier transform infrared analyses of all the compositions.

scholarly journals Guar gum (GG) / Methylcellulose (MC) Blends and their Composites with Maghemite Nanoparticles

2020 ◽  
Vol 4 (9) ◽  
pp. 96-102
Keyword(s):  
Guar Gum ◽  
Methyl Cellulose ◽  
Dilute Solution ◽  
Maghemite Nanoparticles ◽  
Immiscible Polymer Blends ◽  
Solvent Water ◽  
Solution Cast ◽  
Maghemite Nanoparticle ◽  
Dilute Solution Viscometry ◽  
Cast Technique

Miscibility of polymers decides the applicability of the resulting blends and immiscible polymer blends can be made compatible with suitable compatibilizer. Miscibility of blends of guar gum (GG) and methyl cellulose (MC) in common solvent water were studied by refractive index, density, ultrasonic velocity, and dilute solution viscometry methods at 30°C and 40°C. Based on these measurements, it is found that the polymer blend of GG/MC is immiscible. The effect of compatibilization with 0.02 wt% maghemite nanoparticle was studied in aqueous solution and found that 10/90 GG/MC blend is miscible in the presence of maghemite. Solution cast technique was used to prepare thin films of GG/MC blend – maghemite composite and characterized by scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) method.

Sign in / Sign up

Export Citation Format

Share Document