Hydroxypropyl cellulose as a green polymer for thermo-responsive aqueous foams

被引:56
|
作者
Weissenborn, Eric [1 ,2 ]
Braunschweig, Bjoern [1 ,2 ]
机构
[1] Westfalische Wilhelms Univ Munster, Inst Phys Chem, Corrensstr 28-30, D-48149 Munster, Germany
[2] Westfalische Wilhelms Univ Munster, Ctr Soft Nanosci, Corrensstr 28-30, D-48149 Munster, Germany
基金
欧洲研究理事会;
关键词
TO-GLOBULE TRANSITION; LIGHT-SCATTERING; MOLECULAR-WEIGHT; PHASE-TRANSITION; SMART FOAMS; TEMPERATURE; WATER; DRAINAGE; PNIPAM; FILMS;
D O I
10.1039/c9sm00093c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Hydroxypropyl cellulose (HPC) is a surface active polymer that can change its solubility as a function of temperature. This makes HPC interesting for responsive foams, where macroscopic properties need to be reversibly changed on demand. Analysis of aqueous HPC foams as a function of temperature showed a moderate decrease in foam half-life time from 9000 to 4000 s, when the temperature was increased. However, within a narrow temperature range of +/- 2 degrees C a dramatic decrease in half-life time to <120 s was observed at 43 degrees C in the absence and at 31 degrees C in the presence of 0.7 M NaCl. These drastic changes are highly reversible and are associated to the lower critical solution temperatures (LCST) of HPC in aqueous solutions. In fact, dynamic light scattering experiments indicate that HPC molecules form aggregates at temperatures >31 degrees C (0.7 M NaCl) and >43 degrees C (0 M NaCl), which shrink in size when the temperature is increased further. From these results, we conclude that the LCST of 1 MDa HPC is at 43 degrees C when no salt is present and is at 31 degrees C in aqueous solutions with 0.7 M NaCl. In addition, shear rheology of bulk solutions and surface tensiometry indicate that the solution's viscosity and the surface pressure dramatically change at the respective LCSTs. Obviously, the solvent's viscosity triggers substantial changes in foam drainage at the LCST, which is shown to be the main driving force for the temperature responsiveness of HPC foams.
引用
收藏
页码:2876 / 2883
页数:8
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