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| Study on the End-group Structure of PPTA Fiber and Its Beating Powder by MALDI-TOF MS |
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| DOI：10.11980/j.issn.0254-508X.2015.10.006 |
| Key Words:matrix-assisted laser desorption/ionization time-of-flight mass spectrometry(MALDI-TOF MS) PPTA fiber beating powder end-group structure |
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| Abstract:Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) was used to study the end-group structure of two kinds of poly (p-phenylene terephthalamide)-PPTA short-cut fiber (A1-PPTA fiber and A2-PPTA fiber)and the PPTA powder produced by beating the PPTA fibers during the paper-making process. The basic database of the spectral characteristic peak and the end-group structure was established to reveal the relationship between the reaction mechanism and the end-group structure, and to find the producing causes of the PPTA powder during the beating process. The results showed that polymerization process for A1-PPTA fiber and A2-PPTA fiber were both carried out with an approximate equivalent amount of reactants. The probability of chain transferring to solvent in A2-PPTA fiber was higher than A2-PPTA fiber; The existing of more end-group structures which were not benefit to fiber’s mechanical strength in A2-PPTA fiber caused more large amount of powder in the beating process. |
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