Nitrogen Configuration of Polybenzoxazine Carbide

2015 ◽  
Vol 34 (3) ◽  
Author(s):  
Huachuan Zhang ◽  
Wu Gu ◽  
Rongqi Zhu ◽  
Qichao Ran ◽  
Yi Gu
Keyword(s):  
Mass Spectrometry ◽  
Photoelectron Spectroscopy ◽  
Carbon Materials ◽  
Gas Chromatography Mass Spectrometry ◽  
Pyrolysis Gas ◽  
Amine Nitrogen ◽  
X Ray ◽  
Pyrolysis Gas Chromatography ◽  
First Time ◽  
Pyridinic Nitrogen

AbstractCarbon materials should have specific centers for its functionalities. In this study, the specific centers of polybenzoxazine carbides were studied for the first time. Three classical benzoxazine monomers were chose as the object. The transformation of nitrogen configuration of polybenzoxazines carbides was characterized via pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) and X-ray photoelectron spectroscopy (XPS). The results showed that the tertiary amine nitrogen converted to pyridinic nitrogen and pyrrolic nitrogen incorporated in graphene residuals during the carbonization, which were the specific centers for the functionality.

scholarly journals Characterization and identification of traditional Chinese handmade paper via pyrolysis-gas chromatography-mass spectrometry

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 3942-3951
Author(s):  
Na Yao ◽  
Shuya Wei
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Gas Chromatography Mass Spectrometry ◽  
Fiber Morphology ◽  
Pyrolysis Gas ◽  
Pyrolysis Gas Chromatography ◽  
Chromatography Mass Spectrometry ◽  
Different Origins ◽  
First Time ◽  
Mulberry Paper

The traditional method for the identification of paper from different origins relies on microscopy to observe the fiber morphology, which requires professional experience. In this paper, pyrolysis-gas chromatography-mass spectrometry was utilized to analyze five types of traditional Chinese handmade papers, e.g., ramie paper, bamboo paper, bark fiber paper (mulberry paper and kozo paper), and Langdu paper. The results demonstrated that this method can be used to differentiate the four types of handmade papers. A high phenolic compound content was detected in bamboo paper; macromolecular triterpenoids, e.g., β – amyrin, α – amyrin, and stigmastan- 3,5-diene were found in mulberry paper and kozo paper; while those compounds were not found in ramie paper. In particular, a large quantity of phytosterol compounds were found for the first time in Langdu paper. This not only can be used to differentiate Langdu paper from others, but also it helps to explain why Langdu paper can resist insect and mildew activities. Results of the study can provide experimental reference for characterization of traditional handmade Chinese papers via pyrolysis-gas chromatography-mass spectrometry.

CHARACTERISATION OF DISSOLVED ORGANIC CARBON (DOC) LEACHED FROM LEAVES IN WATER

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Markus Heryanto Langsa
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Total Organic Carbon ◽  
Gas Chromatography Mass Spectrometry ◽  
Pyrolysis Gas ◽  
Pyrolysis Gas Chromatography ◽  
Chromatography Mass Spectrometry ◽  
Pinus Radiate

<p>Penelitian ini bertujuan untuk menentukan senyawa organik khususnya organic karbon terlarut (DOC) dari dua spesies daun tumbuhan (<em>wandoo eucalyptus </em>and <em>pinus radiate, conifer</em>) yang larut dalam air selama periode 5 bulan leaching eksperimen. Kecepatan melarutnya senyawa organic ditentukan secara kuantitatif dan kualitatif menggunakan kombinasi dari beberapa teknik diantaranya Total Organic Carbon (TOC) analyser, Ultraviolet-Visible (UV-VIS) spektrokopi dan pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS).</p><p>Hasil analisis DOC dan UV menunjukkan peningkatan yang tajam dari kelarutan senyawa organic di awal periode pengamatan yang selanjutnya berkurang seiring dengan waktu secara eksponensial. Jumlah relatif senyawa organic yang terlarut tergantung pada luas permukaan, aktifitas mikrobiologi dan jenis sampel tumbuhan (segar atau kering) yang digunakan. Fluktuasi profil DOC dan UV<sub>254</sub> disebabkan oleh aktifitas mikrobiologi. Diperoleh bahwa daun kering lebih mudah terdegradasi menghasilkan senyawa organic dalam air dibandingkan dengan daun segar. Hasil pyrolysis secara umum menunjukkan bahwa senyawa hidrokarbon aromatic dan fenol (dan turunannya) lebih banyak ditemukan pada residue sampel setelah proses leaching kemungkinan karena adanya senyawa lignin atau aktifitas humifikasi mikrobiologi membuktikan bahwa senyawa-senyawa tersebut merupakan komponen penting dalam proses karakterisasi DOC.</p>

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