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- W2025814851 abstract "A series of novel highly branched poly(urethane-imide)s (PUIs) were first successfully prep- ared by a two-step method with toluene-2,4-diisocyanate (TDI), pentaerythritol (PAT) and dianhydrides, including pyromellitic dianhydride (PMDA), 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA) and 4,4'-oxydiphthalic anhydride (ODPA). It was found that the prepolymerization of PAT and TDI at 40 °C was ascertained to be 40 minutes. And the imidization of the prepolymer and PMDA was successfuly carried out after 120 °C for 2 hours. The XRD demonstrated that the obtained highly branched PUIs pre- sented semicrystalline aggregation structure which had clear crystal phase with the d-spacing around 0.39 nm. TGA curves exhibited that these highly branched PUIs had obviously two steps of weight loss attributed to the urethane chain segment and imide chain segment, respectively. The solubility testing indicated that the highly branched PUIs exhibited desirable solubility in various polar aprotic solvents, and were also resistant to dilute acid corrosion." @default.
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- W2025814851 date "2009-08-01" @default.
- W2025814851 modified "2023-09-25" @default.
- W2025814851 title "Synthesis and Characterization of Highly Branched Poly(urethane-imide)s" @default.
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- W2025814851 doi "https://doi.org/10.4028/www.scientific.net/amr.79-82.1575" @default.
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