ICCAS OpenIR
Investigation on Phase Separation Kinetics of Polyolefin Blends through Combination of Viscoelasticity and Morphology
Niu, Yanhua1; Yang, Liang1,2; Shimizu, Katsumi3; Pathak, Jai A.4; Wang, Howard5; Wang, Zhigang1
2009-07-02
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
ISSN1520-6106
Volume113Issue:26Pages:8820-8827
AbstractPhase separation kinetics of polyethylene copolymer blends polyethylene-co-hexene (PEH)/polyethylene-co-butene (PEB) at a phase separation temperature of 130 degrees C have been investigated through the combination of rheological measurements and optical microscope observation. When the blends are located in the unstable region, i.e., PEH/PEB 40/60 blend (H40), 50/50 blend (H50), and 60/40 blend (H60), due to the coeffect of the fast decay of concentration fluctuations and the reduced interfacial area, the stroage modulus, G', behaves dramatically, decreasing at the early or intermediate stages; while when the blends are located in the metastable region, i.e., PEH/PEB 70/30 blend (H70), G' decreases slightly and slowly during the whole time sweep process. During the cyclic frequency sweeps, G' evolutions of H50 and H70 show similar trends. Obviously different from the strong phase segregation systems, the increase of G' with time in the metastable region has not been observed, possibly due to the entanglement effects and weak interaction between the components of polyethylene blends. The interfacial tension-driven or diffusion-limited morphological evolutions of H50 and H70 during phase separation give direct interpretations to the viscoelastic difference between the two blends, which is dominated by different phase separation kinetics. The relatively low interfacial tensions at the late stage of phase separation for H50 (0.5-0.38 mN/m varying with time) and H70 (1.2 mN/m) can be estimated by using the Gramespacher-Meissner model.
DOI10.1021/jp901209b
Indexed BySCI
Language英语
WOS IDWOS:000267384400004
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/67698
Collection中国科学院化学研究所
Corresponding AuthorWang, Zhigang
Affiliation1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Key Lab Engn Plast, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
3.RIKEN, SPring Ctr 8, Adv Prot Crystallog Res Grp, Harima Inst, Saya, Hyogo 6795148, Japan
4.George Mason Univ, Dept Chem, Fairfax, VA 22030 USA
5.SUNY Binghamton, Dept Mech Engn, Binghamton, NY 13902 USA
Recommended Citation
GB/T 7714
Niu, Yanhua,Yang, Liang,Shimizu, Katsumi,et al. Investigation on Phase Separation Kinetics of Polyolefin Blends through Combination of Viscoelasticity and Morphology[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2009,113(26):8820-8827.
APA Niu, Yanhua,Yang, Liang,Shimizu, Katsumi,Pathak, Jai A.,Wang, Howard,&Wang, Zhigang.(2009).Investigation on Phase Separation Kinetics of Polyolefin Blends through Combination of Viscoelasticity and Morphology.JOURNAL OF PHYSICAL CHEMISTRY B,113(26),8820-8827.
MLA Niu, Yanhua,et al."Investigation on Phase Separation Kinetics of Polyolefin Blends through Combination of Viscoelasticity and Morphology".JOURNAL OF PHYSICAL CHEMISTRY B 113.26(2009):8820-8827.
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