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Hamideh Mehr-11-19-19.pdf (8.09 MB)

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Application of High-Performance Polyimides in Additive Manufacturing and Powder Coating

Shokouhi Mehr, Hamideh
http://rave.ohiolink.edu/etdc/view?acc_num=akron1574204777058183

Abstract Details

2019, Doctor of Philosophy, University of Akron, Polymer Engineering.
Additive manufacturing (AM) is one of the fast-growing technologies with application in production of prototypes, functional biological parts, and devices. Combination of this technology with old-fashioned material functionalization techniques lead to the broad applications of the 3D printed objects in tissue engineering, aerospace and electronics. To adjust the properties of the final parts to proper application, different 3D printing methods such as digital light processing (DLP), robocasting or direct ink writing (DIW) and stereolithography apparatus (SLA) have been applied. SLA and DLP are among the most applicable techniques for photosensitive resins due to their accuracy and precision of printed objects. In these techniques, liquid resins are exposed to a source of UV in a layer-by-layer sequence. UV-curable resins such as, acrylic resins, polyester, and epoxies are among the most used resins. The final printed objects mostly have deficiencies in thermal stability and mechanical properties. Lack of specific properties limit the applications in aerospace, aviation and automotive industries. To overcome these boundaries, development of new UV-curable resins has been center of academic and industrial researches. In this work, new UV-curable polyimide was developed for the first time for both DLP and DIW based 3D printings. The maleimide-terminated polyimide was modified by substitution of photocurable allyl group. The substitution increased the solubility of the resin in liquid reactive diluents without reducing the thermal stability of the printed films. The formulated resins by addition of different reactive diluents were used in indirect 3D printing method for mechanical characterizations and among 6 formulations, two were shown highest strength modulus up to ~100 MPa. All formulated resins were cured under UV-light without further thermal need and thermal, mechanical and dynamic properties of achieved tensile bones were characterized by TGA, this is the first-time reported polyimide 3D printing resins with DIW technique while the DLP technique also provided high tensile strength and elasticity in objects.
Mark Soucek, PhD (Advisor)
Thein Kyu, PhD (Committee Member)
Youjin Min, PhD (Committee Member)
Steven Chuang , PhD (Committee Member)
Toshikazu Miyoshi, PhD (Committee Member)
200 p.
Materials Science; Polymer Chemistry; Polymers

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Citations

  • Shokouhi Mehr, H. (2019). Application of High-Performance Polyimides in Additive Manufacturing and Powder Coating [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1574204777058183

    APA Style (7th edition)

  • Shokouhi Mehr, Hamideh. Application of High-Performance Polyimides in Additive Manufacturing and Powder Coating . 2019. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1574204777058183.

    MLA Style (8th edition)

  • Shokouhi Mehr, Hamideh. "Application of High-Performance Polyimides in Additive Manufacturing and Powder Coating ." Doctoral dissertation, University of Akron, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1574204777058183

    Chicago Manual of Style (17th edition)

akron1574204777058183
180
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This open access ETD is published by University of Akron and OhioLINK.