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Effects of the Surface Tension upon the Viscosity Behavior of Dilute PEO Solutions
Zhang Shicheng,Xu Xiaoyun,YangHaiyang,Zhang Jing,Zhu Pingping,He Pingsheng
Author NameAffiliation
Zhang Shicheng College ofPetroleum andNatural Gas Engineering, University ofPetroleum, Beijing 102249 Department ofPolymer Science and Engineering, University ofScience andTechnology ofChina, Hefei 230026 
Xu Xiaoyun Department ofPolymer Science and Engineering, University ofScience andTechnology ofChina, Hefei 230026 
YangHaiyang Department ofPolymer Science and Engineering, University ofScience andTechnology ofChina, Hefei 230026 
Zhang Jing College ofPetroleum andNatural Gas Engineering, University ofPetroleum, Beijing 102249 
Zhu Pingping Department ofPolymer Science and Engineering, University ofScience andTechnology ofChina, Hefei 230026 
He Pingsheng Department ofPolymer Science and Engineering, University ofScience andTechnology ofChina, Hefei 230026 
Abstract:
The viscosity behavior of poly(ethylene oxide)(PEO) with different molecular weights in the water and benzene was determined respectively. Itwas noted thatthe reduced viscosityof PEO in thewater deviated negatively from the linear relationship at lower concentrations in the reduced viscosity versus concentration plot. On the other hand, the reduced viscosity of PEO in benzene increased linearlywith concentration even at lower concentrations. The surface tension measurements indicated that PEO could reduce the surface tension ofwater considerably but had no effect on the surface tension of benzene. The influence of the surface tension upon the viscosity behavior of polymer solutionwas notable, especiallywhen the surface tension between the polymer solution and the pure solvent was significant. By measuring the surface tension ofwater and aqueous PEOsolution, togetherwith the geometric parameterof the viscometer, the influence of the surface tension upon the measurement of the flowing time could be studied quantitatively. The calculations were consistentwith experimental results approximately. Ift0*was employed to determine the viscosity of polymer solution, the influence of the surface tension upon the viscosity behavior of polymer solution could be counteracted completely and the reduced viscosity of PEO in water increased linearlywith concentration just the same as PEO in benzene.
Key words:  Surface tension, Additional pressure, Polymer solution, Reduced viscosity
FundProject:
表面张力对PEO稀溶液粘度行为的影响
张士诚,徐小云,杨海洋,张劲,朱平平,何平笙
摘要:
测定了不同分子量聚氧化乙烯(PEO)在水和苯溶剂中的粘度,发现在低浓度区PEO水溶液的比浓粘度出现负偏离, PEO苯溶液比浓粘度与浓度之间依旧满足线性关系.表面张力测定结果表明, PEO分子显著降低了水的表面张力,而苯的表面张力则不受影响.PEO水溶液和纯溶剂水表面张力的不同干扰了高分子溶液和溶剂在粘度计中流过时间的测量,导致低浓度区PEO水溶液比浓粘度出现负偏离.利用PEO水溶液和水表面张力测定结果,结合乌式粘度计的几何尺寸,定量分析了PEO水溶液和纯溶剂水表面张力的差异对粘度测量结果的影响,计算结果与实验结果基本相符.如果用PEO水溶液流过时间对浓度作图的外推值t0*计算相对粘度,可以完全消除PEO水溶液和水表面张力差异对粘度测量的影响.
关键词:  表面张力  附加压强  高分子溶液  比浓粘度
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