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Morphological studies of polyurethane based pressure sensitive adhesives by tapping mode atomic force microscopy

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Abstract

The polyurethane pressure sensitive adhesive (PUPSA) films have been prepared on polypropylene sheets with coating bars. The topographical information of the dried films is investigated using phase images by using Atomic Force Microscope (AFM) in tapping mode. The film develops a segmental architecture by using different compositions. Various samples of PUPSA comprising of polypropylene glycol PPG (Mn = 425, 1000, 2000 and 2700 g-mol−1) and hydroxyl terminated polybutadiene HTPB (Mn = 1984 and 2912 g-mol−1) along with three different isocyanates: 1,6 hexane diisocyanate (HDI), isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (H12MDI) have been used for capturing the images through AFM. The samples contained 40 wt.% of solid content containing different nature of macrodiols and diisocyanate. Due to varying composition, dispersion in domain area along with different contour and dimension has been observed in the images. Apparently, there seems no correlation of spherulites and lamellae in different domains. However, the properties imparted by high molecular weight HTPB resulted in non-adhesive stiff material.

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Acknowledgements

The authors are thankful to the Higher Education Commission of Pakistan for providing the funding to complete this work. They also acknowledge the participation of Prof JL. Keddie, technical assistance from Dr. Robert gurney and Mrs. Violeta Doukova at the University of Surrey, UK.

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Authors and Affiliations

  1. Institute of Chemistry, Government College University, Faisalabad, 38030, Pakistan

    Nadia Akram, Khalid Mahmood Zia, Muhammad Saeed & Asim Mansha

  2. Department of Chemistry, Quaid-i-Azam University, Islamabad, 45320, Pakistan

    Waheed Gul Khan

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  1. Nadia Akram
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  2. Khalid Mahmood Zia
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  3. Muhammad Saeed
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  4. Asim Mansha
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  5. Waheed Gul Khan
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Correspondence to Nadia Akram.

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Akram, N., Zia, K.M., Saeed, M. et al. Morphological studies of polyurethane based pressure sensitive adhesives by tapping mode atomic force microscopy. J Polym Res 25, 194 (2018). https://doi.org/10.1007/s10965-018-1591-6

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  • DOI: https://doi.org/10.1007/s10965-018-1591-6

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