Substrate Effect on T<sub>g</sub> of Random Copolymers of 4-tert-butylstyrene and 4-acetoxystyrene

ORAL

Abstract

Confinement effect on the dynamics of polymers in nanoscale films is known to cause variations in the glass transition temperature, Tg, of the films with film thickness. We studied the Tg of random copolymers of 4-tert-butylstyrene (4TBS) and 4-acetoxystyrene (4AS). Our result indicates that the component with a stronger substrate confinement effect dominates the Tg of the copolymer films. We have also explored the influence of pre-annealing time on the Tg’s. According to a previous study, by shortening the pre-annealing time, the Tg reductions of thin 4TBS films were enhanced. In our copolymer films, we found that that adjusting the pre-annealing time only affected the Tg of the copolymer films in which 4TBS is the majority component.

*We acknowledge support of the RGC of HK through the Project 16302917. B.D. acknowledges support of the National Science Foundation of China through the project 21674097.

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Presenters

  • Tong Wang

    • Department of Physics, Hong Kong University of Science and Technology

Authors

  • Tong Wang

    • Department of Physics, Hong Kong University of Science and Technology

  • Jinsong YAN

    • Department of Physics, Hong Kong University of Science and Technology

  • Hailin Yuan

    • Department of Physics, Hong Kong University of Science and Technology

  • Ho Yi Lam

    • Department of Chemical and Biological Engineering, Hong Kong University of Science and Technology

  • Chao Lv

    • Department of Polymer Science and Engineering, Zhejiang University

  • Binyang Du

    • Department of Polymer Science and Engineering, Zhejiang University

  • Ophelia Tsui

    • Department of Physics, Hong Kong University of Science and Technology
    • Boston University
    • Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong