کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
673920 1459533 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Degree of imidization for polyimide films investigated by evolved gas analysis-mass spectrometry
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Degree of imidization for polyimide films investigated by evolved gas analysis-mass spectrometry
چکیده انگلیسی

The evolved gas analysis-mass spectrometry (EGA-MS) method is described as a new approach for determining the degree of imidization (DOI) in polyimide (PI) films. Partially imidized PI films allowed water to release through the re-imidization process at a sufficiently high imidization temperature. Evolved water from the re-imidization process was quantitatively detected by EGA-MS. From the obtained water content, the number of moles of residual amic acid groups in repeating units of PI was found. Consequently, the DOI of the PI films could be found from the mole ratio of PI and the sum of the PI and the residual polyamic acid (PAA). A water content of 0.018% and a DOI of 99.85% can be measured from 40 mg of PI films using this method. In this study, it was found that rigid PIs showed fast imidization reactions at relatively lower temperatures, while flexible PIs were activated and showed fast imidization reactions at relatively higher temperatures. In addition, the end point of the imidization process in multi-layer PI films was determined by this method.

Figure optionsDownload as PowerPoint slideHighlights
► The degree of imidization (DOI) in the polyimide films were investigated by EGA-MS.
► The evolved water from the re-imidization process was quantitatively detected by EGA-MS.
► The absolute values of the DOI were obtained without relativization by EGA-MS analysis.
► Fast imidization were occurred in rigid PIs at relatively lower temperatures.
► Flexible PIs showed fast imidization reaction at relatively higher temperatures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 551, 10 January 2013, Pages 184–190
نویسندگان
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