Cure kinetics of bismaleimides as basis for polyimide‐like inks for PolyJet™‐3D‐printing. Issue 12 (11th November 2018)

• Record Type: Journal Article
• Authors: Wagner, Annika; Gouzman, Irina; Atar, Nurit; Grossman, Eitan; Pokrass, Mariana; Fuchsbauer, Anita; Schranzhofer, Leo; Paulik, Christian
• Is Part Of: Journal of applied polymer science. Volume 136:Issue 12(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-11-11
• Subjects: differential scanning calorimetry -- kinetics -- photopolymerization -- spectroscopy -- thermal properties; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.47244
• Languages: English
• ISSNs: 0021-8995

Abstract

ABSTRACT: Since polyimides are well known for their excellent chemical and thermal stability and outstanding mechanical properties there is increasing interest in developing polyimide‐based inks to produce additively manufactured parts with properties superior to those of currently available materials. Usage of bismaleimides (BMI) as precursors allows polyimides to be fabricated via PolyJet™ printing (Stratasys Ltd., Rehovot, Israel). Characterization of the curing kinetics is a central part of process development, as fast curing initiated by UV light is desired. Here, a comprehensive study of thermal and UV curing of BMI oligomers with various molecular weights and chemical structures is presented. Fourier transform infrared spectroscopy serves as a tool for determining the curing degree. Furthermore, an estimation of the activation energy for thermal curing is performed. UV curing of the selected BMIs leads to highly crosslinked, thermoset polymers with excellent chemical resistance and thermal stability which are of great interest for PolyJet™ 3D printing. © 2018 The Authors. Journal of Applied Polymer Science published by Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47244. Abstract :