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Synthesis and Characterization of Polyimide/Polyacrylonitrile Blend

Surya, Ramakrishna
http://orcid.org/0000-0001-7868-9045
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1574417741513506

Abstract Details

2019, MS, University of Cincinnati, Engineering and Applied Science: Materials Science.
In this project the effect of polyacrylonitrile (PAN) on thermal and mechanical properties of polyimide (PI) was studied. The aim of this study is to formulate multifunctional polyimide/polyacrylonitrile film by combining excellent properties of polyimide such as high solvent and wear resistance, high dimensional stability, excellent thermal resistance and high modulus with the superior properties of polyacrylonitrile such as low density, thermal stability, high strength and modulus of elasticity. Polyacrylonitrile is a high-performance polymer that unlike others has the capability to form highly oriented molecular structure when subjected to a low temperature heat treatment. It has applications in ultra-filtration membranes, hollow fibers for reverse osmosis and fibers for textile. It is also pre-cursor material for the manufacture of carbon fibers which are characterized by high stiffness, high tensile strength, low weight, high chemical resistance, high temperature tolerance and low thermal expansion. In this study, a polyimide blend containing different weight percentages of polyacrylonitrile (0.1, 0.5, 1, 5 and 10 wt%) was fabricated into thin films and characterized for thermal properties using Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). Structural and mechanical properties were evaluated using Fourier Transform Infrared Spectroscopy (FTIR) and Dynamic Mechanical Analysis (DMA), respectively. Morphology was studied using an Optical Microscope. From FTIR, the degree of Imidization of the blend was found to be 97.5%. Tg of the copolymer was calculated to be ~370ºC from the tan d peak obtained from DMA. While the 10wt% PAN/PI blend exhibits the highest Tg, the 1% exhibits the highest damping ability. Rate of change of enthalpy was calculated using Differential Scanning Calorimetry which shows that increasing the content of PAN resulted in a decrease in heat release. Percentage mass retained and char retention calculations were done from the TGA data. By utilizing the results obtained from these techniques, this materials suitability for thermo-mechanical applications is discussed in this work.
Jude Iroh, Ph.D. (Committee Chair)
Jonathan Nickels, Ph.D. (Committee Member)
Yoonjee Park, Ph.D. (Committee Member)
74 p.
Polymers
polyimide; polyacrylonitrile; thermal properties; mechanical properties; synthesis; characterization

Recommended Citations

Citations

  • Surya, R. (2019). Synthesis and Characterization of Polyimide/Polyacrylonitrile Blend [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1574417741513506

    APA Style (7th edition)

  • Surya, Ramakrishna. Synthesis and Characterization of Polyimide/Polyacrylonitrile Blend. 2019. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1574417741513506.

    MLA Style (8th edition)

  • Surya, Ramakrishna. "Synthesis and Characterization of Polyimide/Polyacrylonitrile Blend." Master's thesis, University of Cincinnati, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1574417741513506

    Chicago Manual of Style (17th edition)

ucin1574417741513506
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This open access ETD is published by University of Cincinnati and OhioLINK.