General Information
    • ISSN: 2010-0221
    • Frequency: Bimonthly
    • DOI: 10.18178/IJCEA
    • Editor-in-Chief: Dr. Eldin W. C. Lim
    • Executive Editor: Mr. Ron C. Wu
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Editor-in-chief
Dr. Eldin W. C. Lim
Dept. of Chemical and Biomolecular Engineering,
National University of Singapore, Singapore
IJCEA 2012 Vol.3(6): 410-412 ISSN: 2010-0221
DOI: 10.7763/IJCEA.2012.V3.230

Miscibility of Polymer Blends Comprising Poly (Ethylene Oxide) - Epoxidized Natural Rubber

Mohd Azizi Nawawi, Sim Lai Har, and Chan Chin Han

Abstract—Miscibilty of thermoplastic-elastomer blends comprising poly(ethylene oxide) (PEO) and epoxidized natural rubber with 25 mol% epoxide level (ENR-25) were studied by differential scanning calorimetry (DSC) and polarized optical microscope (POM), respectively. Two glass transition temperatures (Tg), corresponding to those of neat PEO and ENR-25 are observed over the entire composition range. It reflects the immiscibility of the two constituents in the molten state. Hoffman-Weeks method was employed to determine the equilibrium melting temperatures (Tm o) for the PEO/ENR-25 blends. No systematic variations of Tm o and equivalently the apparent melting temperature (Tm) with ascending ENR-25 content for the blends are detected. However, quantities Tm increase with ascending isothermal crystallization temperature (Tc). There is no melting transition of PEO in PEO/ENR-25 blends when the ENR-25 content in the blend > 50 wt%. Reciprocal half time (t1/2 -1) is applied to characterize the isothermal crystallization kinetics of the phase-separated blends. The rate of crystallization and equivalently the spherulite growth rate (G) of PEO decreases with increasing Tc but exhibit no systematic variations with ascending ENR-25 content. No crystallization is observed for the blends when the PEO content is ≤ 50 and >= 40 wt% when analyzed using DSC and POM, respectively. The birefringence Maltese cross structure of PEO appears deformed with irregular border and coarse texture when the amount of ENR-25 in the blend >= 40 wt%
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Index Terms—Epoxidized natural rubber, glass transitiontemperature, isothermal crystallization, morphology

The authors are with the Applied Sciences, Universiti Teknologi Mara (e-mail: azizi_nawawi@salam.uitm.edu.my).

[PDF]

Cite: Mohd Azizi Nawawi, Sim Lai Har, and Chan Chin Han, "Miscibility of Polymer Blends Comprising Poly (Ethylene Oxide) - Epoxidized Natural Rubber," International Journal of Chemical Engineering and Applications vol. 3, no. 6, pp. 410-412, 2012.

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