高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (7): 1437.

• 研究论文 • 上一篇    下一篇

轻度磺化聚苯乙烯与聚苯乙烯共混物的流变性能表征

王进, 郑学晶, 刘琛阳, 程兴国, 何嘉松   

  1. 中国科学院化学研究所, 分子科学中心, 工程塑料国家重点实验室, 北京 100080
  • 收稿日期:2001-01-18 出版日期:2002-07-24 发布日期:2002-07-24
  • 通讯作者: 何嘉松(1944年出生),男,研究员,博士生导师,从事聚合物共混物与复合材料研究.E-mail:hejs@sklep.icas.ac.cn E-mail:hejs@sklep.icas.ac.cn
  • 基金资助:

    国家自然科学基金(批准号:59873026)

Rheological Characterization of Lightly Sulfonated Polystyrene Ionomers and Its Blends with Precursor Polystyrene

WANG Jin, ZHENG Xue-Jing, LIU Chen-Yang, CHENG Xing-Guo, HE Jia-Song    

  1. State Key Laboratory of Engineering Plastics, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Science, Beijing 100080, China
  • Received:2001-01-18 Online:2002-07-24 Published:2002-07-24

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被引次数

9

摘要： 采用DSR-200动态应力流变仪研究了磺化度为0.98%(摩尔分数)的轻度磺化聚苯乙烯(SPS)离聚物及其锌盐(ZnSPS)与聚苯乙烯(PS)的共混物(PS/SPS,PS/ZnSPS)的流变性能.由于离聚物中离子聚集的物理交联作用,使其流变性能与PS相比有明显差别.动态频率实验结果表明,所有样品均可采用时温等效处理.另外,在与分子链运动相关的低频区,由于离子聚集的作用使得离聚物的模量远大于PS的模量.离聚物在稳态剪切作用下,由于离子聚集的破坏而表现出明显的屈服现象,并能用Utracki的屈服应力公式表征其屈服应力和零切粘度.此外,离聚物的屈服现象还与温度相关.由于动态和稳态实验分别测试离子聚集存在和破坏的不同材料状态,因此对离聚物无法应用Cox-Merz规则.动态和稳态实验结果均表明,PS/SPS和PS/ZnSPS的性能与组成的变化规律不同,意味着二者之间存在不同的离子聚集结构或相互作用.

关键词: 流变性能, 磺化聚苯乙烯, 屈服应力, 共混物

Abstract: The rheological properties of 0.98%(molar frac‘tion) 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 PSdue 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/SPSand PS/ZnSPSblends.

Key words: Rheological properties, Sulfonated polystyrene ionomers, Yield stress, Blends

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