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Rheological characterization of lightly sulfonated polystyrene ionomers and its blends with precursor polystyrene
Wang, J; Zheng, XJ; Liu, CY; Cheng, XG; He, JS
2002-07-01
Source PublicationCHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
ISSN0251-0790
Volume23Issue:7Pages:1437-1443
AbstractThe rheological properties of 0.98% (molar fraction) lightly sulfonated polystyrene ionomer (SPS), zinc neutralized SPS (ZnSPS) and their blends with precursor polystyrene (PS) are reported. It is found that the rheological properties of ionomers and-their blends are quite different with PS, due to the ionic aggregates acting as physical cross-links in ionomers. Using linear viscoelasticity data, the time-temperature superposition can be conducted to all samples. Differences are also found in the low frequency region of linear viscoelasticity data. Correlated with the relaxation of polymer chains, the moduli of ionomers are higher than those of PS due to the effect of ionic aggregates. In the steady shear test, typical yield phenomena can be found in the apparent viscosity curves of ionomers, which are also resulted from the ionic aggregates. Utracki's formula for yield stress fits the apparent viscosity data properly and the yield stress and zero shear viscosity of ionomers are obtained. It is also found that the yield phenomena of ionomers are disappeared above certain temperature. The Cox-Merz rule is invalid for ionomers, due to the complex viscosity and apparent viscosity characterizes at different state of ionomer fluid, with ionic aggregates and breakdown of ionic aggregates, respectively. Finally, the different relationship between blends composition and rheological properties indicate that different ionic aggregate structure:or ionic association exists in the PS/SPS and PS/ZnSPS blends.
KeywordRheological Properties Sulfonated Polystyrene Ionomers Yield Stress Blends
Indexed BySCI
Language英语
WOS IDWOS:000176908400056
PublisherHIGHER EDUCATION PRESS
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/78162
Collection中国科学院化学研究所
Corresponding AuthorHe, JS
AffiliationChinese Acad Sci, Inst Chem, State Key Lab Engn Plast, Ctr Mol Sci, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Wang, J,Zheng, XJ,Liu, CY,et al. Rheological characterization of lightly sulfonated polystyrene ionomers and its blends with precursor polystyrene[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2002,23(7):1437-1443.
APA Wang, J,Zheng, XJ,Liu, CY,Cheng, XG,&He, JS.(2002).Rheological characterization of lightly sulfonated polystyrene ionomers and its blends with precursor polystyrene.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,23(7),1437-1443.
MLA Wang, J,et al."Rheological characterization of lightly sulfonated polystyrene ionomers and its blends with precursor polystyrene".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 23.7(2002):1437-1443.
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