Effect of salts and surfactant and their doses on the gelation of extremely dilute solutions of methyl cellulose

被引:79
作者
Kundu, PP [1 ]
Kundu, M [1 ]
机构
[1] Sant Longowal Inst Engn & Technol, Dept Chem Technol, Longowal 148106, Punjab, India
关键词
salts; surfactant; dilute solutions of methyl cellulose (below 1%);
D O I
10.1016/S0032-3861(00)00506-1
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The effect of different salts and surfactant and their doses on the gel temperature of extremely dilute solutions (below 1%) of methyl cellulose (MC) has been studied. The gel temperature decreases non-linearly (concave downward) with increase in MC concentration. The addition of salts like NaCl, (NH4)(2)SO4 and (Na)(2)CO3 lowers the gel temperature of MC due to its dehydration. But increase in gel temperature is also observed on addition of 0.5 and 1% NaCl to 0.6 and 0.7% MC solutions, respectively. The addition of 1% sodium carbonate causes appearance of clouds only up to 0.2% MC, cloudy gel followed by dear gel up to 0.3% MC, thereafter phase separation occurs even at room temperature. The effect of addition of a surfactant, sodium lauryl sulphate (SLS) on the process of gelation of aqueous MC solutions has been studied in detail. The gelation process depends on I; the ratio of weight% of surfactant and that of MC present in the aqueous solution. Gels are formed For the limit 0.02 < r < 0.1 for all MC solutions, beyond which phase separation occurs. With increase in r (from the lower limit), gel temperature increases, reaches a maximum and then decreases. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2015 / 2020
页数:6
相关论文
共 12 条
[1]   SUBSTITUENT DISTRIBUTION ALONG THE CELLULOSE BACKBONE IN O-METHYLCELLULOSES USING GC AND FAB-MS FOR MONOMER AND OLIGOMER ANALYSIS [J].
ARISZ, PW ;
KAUW, HJJ ;
BOON, JJ .
CARBOHYDRATE RESEARCH, 1995, 271 (01) :1-14
[2]  
CANABE B, 1996, MACROMOLECULES, V29, P3188
[3]   THERMAL GELATION OF NONIONIC CELLULOSE ETHERS AND IONIC SURFACTANTS IN WATER [J].
CARLSSON, A ;
KARLSTROM, G ;
LINDMAN, B .
COLLOIDS AND SURFACES, 1990, 47 :147-165
[4]   Temperature effects on the interactions between EHEC and SDS in dilute aqueous solutions. Steady-state fluorescence quenching and equilibrium dialysis investigations [J].
Evertsson, H ;
Nilsson, S ;
Holmberg, C ;
Sundelof, LO .
LANGMUIR, 1996, 12 (24) :5781-5789
[5]   Studies on sol-gel transformations. I. The inverse sol-gel transformation of methylcellulose in water. [J].
Heymann, E .
TRANSACTIONS OF THE FARADAY SOCIETY, 1935, 31 (01) :0846-0863
[6]  
ISO N, 1970, Agricultural and Biological Chemistry, V34, P1867
[7]   THE EFFECT OF CERTAIN ADDITIVES ON THE GEL POINT OF METHYLCELLULOSE [J].
LEVY, G ;
SCHWARZ, TW .
JOURNAL OF THE AMERICAN PHARMACEUTICAL ASSOCIATION, 1958, 47 (01) :44-46
[8]   NONIONIC POLYMERS AND SURFACTANTS - SOME ANOMALIES IN TEMPERATURE-DEPENDENCE AND IN INTERACTIONS WITH IONIC SURFACTANTS [J].
LINDMAN, B ;
CARLSSON, A ;
KARLSTROM, G ;
MALMSTEN, M .
ADVANCES IN COLLOID AND INTERFACE SCIENCE, 1990, 32 (2-3) :183-203
[9]  
Rees D A, 1969, Adv Carbohydr Chem Biochem, V24, P267
[10]   THERMAL GELATION PROPERTIES OF METHYL AND HYDROXYPROPYL METHYLCELLULOSE [J].
SARKAR, N .
JOURNAL OF APPLIED POLYMER SCIENCE, 1979, 24 (04) :1073-1087