Pendent Polyimides using Mellitic Acid Dianhydride. IV. Effect of Increased Zirconium-Pendent Group Content on Polymer Properties
| العنوان: | Pendent Polyimides using Mellitic Acid Dianhydride. IV. Effect of Increased Zirconium-Pendent Group Content on Polymer Properties |
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| المؤلفون: | Wei Cheng, Scott D. Luzzi, Marvin L. Illingsworth, Brian J. Landi, Derek Chow, Liling He, Emilie J. Siochi, Shawn R. Wagner, Huixiong Dai |
| المصدر: | High Performance Polymers. 21:744-764 |
| بيانات النشر: | SAGE Publications, 2008. |
| سنة النشر: | 2008 |
| مصطلحات موضوعية: | chemistry.chemical_classification, Thermogravimetric analysis, Zirconium, Materials science, Polymers and Plastics, Organic Chemistry, chemistry.chemical_element, Polymer, Gel permeation chromatography, Residue (chemistry), chemistry.chemical_compound, chemistry, Polymer chemistry, Materials Chemistry, Mellitic acid, Glass transition, Polyimide, Nuclear chemistry |
| الوصف: | For co-polyimides (PIs) of mellitic acid dianhydride, 1,3-aminophenoxybenzene and 4,4′-oxydiphthalic anhydride, Zr-pendent group content could be increased to 50% (mol) improving atomic oxygen (AO) resistance while retaining good film properties. Spectral data are consistent with expected structures. Intrinsic viscosities of 0.54—0.60 dL g—1 and average molecular weights of 111 000—122 000 g mol— 1 estimated from gel permeation chromatography confirm the polymeric nature of co-polyamic acid precursors. Nuclear magnetic resonance integrations and amounts of thermogravimetric analysis residue verify pendent group concentrations. Increasing Zr-pendent group concentration from 10 to 50% (mol) caused glass transition temperatures to increase (198—245 °C), decomposition temperatures to decrease (518—455 °C), and the number of film layers able to be fabricated prior to crack formation to decrease (10 to 8). These numbers of layers were much higher than those for other PIs with comparable Zr-pendent group concentrations. Increased pendent group concentration caused the amount of protective oxide layer formed upon AO exposure to increase. |
| تدمد: | 1361-6412 0954-0083 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::cf08397c22889d1dd324878aa3b0dd3a https://doi.org/10.1177/0954008308097490 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........cf08397c22889d1dd324878aa3b0dd3a |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13616412 09540083 |
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