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Ringed spherulites in ternary polymer blends of poly(ε-caprolactone), poly(styrene-co-acrylonitrile), and polymethacrylate

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Abstract

The relationship between ringed spherulite morphology, crystallization regimes/kinetics, and molecular interactions in miscible ternary blends of poly(ε-caprolactone) (PCL), poly(benzyl methacrylate) (PBzMA), and poly(styrene-co-acrylonitrile) (SAN) was investigated by using differential scanning calorimetry (DSC), polarized optical microscopy (POM), and wide-angle X-ray diffraction (WAXD). The interactions resulted in the deviation of both experimental and calculated T gs and formation of the specific morphology of the spherulitic structure. Ring-banded spherulites were observed in the PCL/PBzMA/SAN ternary blends. The width of ring bands changed with the blend ratio and the crystallization temperature. Additionally, both composition and wt% of AN in the SAN copolymer had an apparent effect on the morphology of PCL spherulites. Both the crystallization structure of lamellae and molecular interactions greatly influenced the ring bands of PCL spherulites. Furthermore, by using the Flory–Huggins approximation, the depression of the melting point showed that interactions in the PCL/PBzMA/SAN-17 blend were greater than in the PCL/PBzMA/SAN-25 blend. In the ternary blends, the great molecular interactions between amorphous and crystalline polymer resulted in better homogeneity and a larger band period of the extinction rings in the PCL spherulites.

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Acknowledgements

This study is sponsored by Taiwan’s National Science Council (#NSC 92–2216-E-168–001-). The authors would wish to thank Prof. E.M. Woo of the National Cheng Kung University (Taiwan), who kindly advised on this study.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, National University of Kaohsiung, No.700, Kaohsiung University Rd., Nan-Tsu Dist., Kaohsiung, 811, Taiwan

    Chean-Cheng Su

  2. Department of Chemical Engineering, National Cheng Kung University, 701–01, Tainan, Taiwan

    Jiann-Horng Lin

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  1. Chean-Cheng Su
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  2. Jiann-Horng Lin
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Correspondence to Chean-Cheng Su.

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Su, CC., Lin, JH. Ringed spherulites in ternary polymer blends of poly(ε-caprolactone), poly(styrene-co-acrylonitrile), and polymethacrylate. Colloid Polym Sci 283, 182–193 (2004). https://doi.org/10.1007/s00396-004-1119-y

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  • DOI: https://doi.org/10.1007/s00396-004-1119-y

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