Abstract
Polyurethane-imide elastomers (PUIEs) are formed from isocyanates, polyols, diamines, and acid anhydrides through liquid polymerization. However, thermoplastic PUIEs have rarely been reported because the synthesis of thermoplastic PUIEs remains a challenge in polymer chemistry. In this study, PUIEs were prepared from 4,4'-diphenylmethane diisocyanate, polyols (polytetramethylene glycol (Mw = 1000), polycaprolactone diol (Mw = 1000), and polycarbonate diol (Mw = 1000)), 4,4'-oxydianiline, and acid anhydrides (pyromellitic dianhydride and 4,4'-oxydiphtaric anhydride). The thermoplasticities of the resultant PUIEs were investigated, and only PUIEs synthesized using 4,4'-oxydiphtaric anhydride expressed thermoplasticity.
Highlights
Polyurethane (PU) has been widely used in a variety of applications in many different fields
Synthesis of the Polyurethane-imide elastomers (PUIEs) was carried out using various raw materials and the PUIE films fused during the process of imidization
The PUIE films that contained oxydiphtaric anhydride (ODPA) became fused, whereas the Pyromellitic dianhydride (PMDA)-containing PUIEs burned and carbonized. This suggests that thermoplasticity only appears in the PUIEs that contained ODPA as the acid anhydride
Summary
Polyurethane (PU) has been widely used in a variety of applications in many different fields. By improving this fundamental property, PU may gain some industrial advantages. We focused on PUIE because it is a novel heat-resistant elastomer that is widely used for commercial products, and we were successful in improving the synthetic method for creating PUIEs [4] [9] [15]. We focused on thermoplastic PUIEs (TPUIEs) that could be utilized as industrial materials. From both the theoretical and practical standpoints, it is important to synthesize TPUIEs that maintain their thermoplasticity This becomes a key challenge in the field of polymer chemistry, and it is important that an expression of PUIE thermoplasticity is clarified.
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