Phase Behavior of Nonionic Polymer Hydroxypropylmethyl Cellulose: Effect of Gemini and Single-Chain Surfactants on the Energetics at the Cloud Point

2010 ◽  
Vol 55 (11) ◽  
pp. 4990-4994 ◽  
Author(s):  
N. Sardar ◽  
M. S. Ali ◽  
M. Kamil ◽  
Kabir-ud-Din
Keyword(s):  
Phase Behavior ◽  
Cloud Point ◽  
Single Chain ◽  
Hydroxypropylmethyl Cellulose ◽  
Nonionic Polymer

scholarly journals Semiflexible polymer solutions. I. Phase behavior and single-chain statistics

2003 ◽  
Vol 119 (24) ◽  
pp. 13113-13128 ◽  
Author(s):  
Andrew J. Spakowitz ◽  
Zhen-Gang Wang
Keyword(s):  
Phase Behavior ◽  
Polymer Solutions ◽  
Single Chain ◽  
Semiflexible Polymer

scholarly journals Influence of hydroxypropylmethyl cellulose-sodium laurylsulfate interaction on rheological properties of the solution

2004 ◽  
Vol 58 (11) ◽  
pp. 521-525 ◽  
Author(s):  
Jelena Saletic ◽  
Verica Sovilj ◽  
Lidija Petrovic
Keyword(s):  
Rheological Properties ◽  
Pharmaceutical Formulations ◽  
Critical Aggregation Concentration ◽  
Saturation Point ◽  
Rotational Viscometer ◽  
Hydroxypropylmethyl Cellulose ◽  
Rheological Measurements ◽  
Nonionic Polymer ◽  
Linear Relationships ◽  
Viscosity Changes

Interactions between the polymers and surfactants in solution have widely been investigated because of their scientific and technological importance. These interactions can be utilized to modify the physicochemical properties of system in many food products, pharmaceutical formulations, personal care products, paints, pesticides, etc. Interaction between nonionic polymer - hydroxypropylmethyl cellulose (HPMC) and anionic surfactant - sodium laurylsulfate (SDS) in solution has been investigated in this paper by rheological measurements. Rheological measurements are performed by rotational viscometer at 20?C and changes of rheological characteristics of HPMC solutions (0.5-1.5%) with increasing SDS concentrations (0-4.0%) were determined. The results of these investigations showed that viscosity of the solution is dependant on HPMC-SDS interaction. At particular SDS concentration viscosity increases, reach maximum and after that decreases until reach constant value. From the viscosity changes the characteristic concentrations of SDS, critical aggregation concentration (cac) and polymer saturation point (psp), were determined. These concentrations are in linear relationships with HPMC concentrations. Rheological properties of the solution are strong influenced by HPMC-SDS interaction and exhibits more or less pronounced pseudoplastic behavior, which changes to Newtonian one after the psp has been reached.

scholarly journals Salt Effect on the Cloud Point Phenomenon of Amphiphilic Drug-Hydroxypropylmethyl Cellulose System

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Mohd. Sajid Ali ◽  
Dileep Kumar ◽  
Hamad A. Al-Lohedan
Keyword(s):  
Cloud Point ◽  
Sodium Salt ◽  
Salt Effect ◽  
Tricyclic Antidepressant ◽  
High Concentration ◽  
Hydroxypropylmethyl Cellulose ◽  
Amphiphilic Drug ◽  
Amphiphilic Drugs ◽  
Nortriptyline Hydrochloride

Effect of two amphiphilic drugs (tricyclic antidepressant, nortriptyline hydrochloride (NORT), and nonsteroidal anti-inflammatory drug, sodium salt of ibuprofen (IBF)) on the cloud point of biopolymer hydroxypropylmethyl cellulose (HPMC) was studied. Effect of NaCl was also seen on the CP of HPMC-drug system. CP of HPMC increases uniformly on increasing the (drug). Both drugs, though one being anionic (IBF) and other cationic (NORT), affect the CP in almost the same manner but with different extent implying the role of hydrophobicity in the interaction between drug and polymer. Salt affects the CP of the drug in a dramatic way as low concentration of salt was only able to increase the value of the CP, though not affecting the pattern. However, in presence of high concentration of salts, minimum was observed on CP versus (drug) plots. Various thermodynamic parameters were evaluated and discussed on the basis of the observed results.

Phase Behavior of a “Clouding” Nonionic Polymer in Water. Effects of Hydrophobic Modification and Added Surfactant on Phase Compositions

1998 ◽  
Vol 102 (16) ◽  
pp. 2954-2959 ◽  
Author(s):  
Fredrik Joabsson ◽  
Olof Rosén ◽  
Krister Thuresson ◽  
Lennart Piculell ◽  
Björn Lindman
Keyword(s):  
Phase Behavior ◽  
Hydrophobic Modification ◽  
Nonionic Polymer ◽  
Water Effects
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