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Time-intensity transformation and internal stress in UV-curable hyperbranched acrylates

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Abstract

The photocuring of three different highly functional acrylates—Di-pentaerythritol penta/hexaacrylate (DPHA) and two hyperbranched molecules (HBP), one with a stiff polyester and one with a more flexible polyether structure—was investigated by means of photorheology, photo differential scanning calorimetry, and beam bending. Special attention was paid to the influence of the composition of DPHA/HBP reactive blends and UV intensity on gelation and vitrification and the resulting dynamics of the internal stress. It was found that adding HBPs to DPHA did not influence gelation significantly, but shifted the onset of vitrification to higher conversions and thus caused lower internal stresses in the material. Increasing UV intensity increased both the conversion at vitrification, thus retarding the build-up of internal stresses, and the ultimate conversion, thus increasing the final stress level. The obtained conversion, gelation, and vitrification data were assembled into time-intensity transformation diagrams, thus providing a useful tool for optimizing photocuring.

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Abbreviations

HBP:

hyperbranched polymer

DSC:

differential scanning calorimetry

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Acknowledgment

Financial support from the Swiss National Science Foundation (SNF project # 2100.063675.00) is gratefully acknowledged. Prof. Manfred Wilhelm from the Max Planck Institute for Polymer Research and Dr. Jean-Marc Vesin from the EPFL are thanked for their fruitful collaboration on photorheology. Furthermore, the authors would like to thank David James from Perstorp Specialty Chemicals, Dr. Aly Franck from TA Instruments, and Dr. André Fuchs from Ciba Specialty Chemicals for providing samples and useful advice.

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Authors and Affiliations

  1. Laboratoire de Technologie des Composites et Polymères (LTC), Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland

    Lars Erik Schmidt, Daniel Schmäh, Yves Leterrier & Jan-Anders E. Månson

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  1. Lars Erik Schmidt
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  2. Daniel Schmäh
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  3. Yves Leterrier
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  4. Jan-Anders E. Månson
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Correspondence to Jan-Anders E. Månson.

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Schmidt, L.E., Schmäh, D., Leterrier, Y. et al. Time-intensity transformation and internal stress in UV-curable hyperbranched acrylates. Rheol Acta 46, 693–701 (2007). https://doi.org/10.1007/s00397-006-0163-6

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  • DOI: https://doi.org/10.1007/s00397-006-0163-6

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