Preparation and Characterization of Chitosan/Polyvinyl Alcohol Blends-A Rheological Study

被引：16
|
作者：
El-Hefian, Esam A. [1 ]
Nasef, Mohamed Mahmoud [2 ]
Yahaya, Abdul Hamid [1 ]
机构：
[1] Univ Malaya, Dept Chem, Fac Sci, Kuala Lumpur 50603, Malaysia
[2] Univ Teknol Malaysia, Dept Chem Engn, Fac Chem & Nat Resources Engn, Utm Skudai 81310, Johor, Malaysia
来源：
E-JOURNAL OF CHEMISTRY | 2010年 / 7卷
关键词：
Chitosan; PVA; Solution blending; Rheological properties; Thermal properties; AQUEOUS-SOLUTIONS; CHITOSAN; VISCOSITY; POLYVINYL-ALCOHOL); CELLULOSE; FILMS;
D O I：
10.1155/2010/275135
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Blends of chitosan (CS) and polyvinyl alcohol (PVA) of different proportions (considering chitosan as the main component) were prepared. The rheological properties of the obtained blend solutions such as the shearing viscosity and the shear stress were investigated as a function of shear rate under various temperatures, shearing times and solution storage times using a digital viscometer. The CS/PVA solutions showed a Newtonian behavior at temperatures in the range of 40-55 degrees C regardless of the blend composition. This was accompanied by a general decrease in the viscosity with increasing PVA content in the blend. The heat-dependant viscosity changes of the blend solutions were found to follow Arrhenius equation. The shearing time was found to have no significant effect on the shearing viscosity of all blended solutions. However, the variation of solution storage period was found to have a mixed effect when time was extended to 3 weeks.
引用
收藏
页码：S349 / S357
页数：9
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