Thermal Analysis and polymerization in PAN/MA and PAN/DMI copolymers
| Autor: | Ling-Ping Su, 蘇凌平 |
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| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 This study can be divided into two parts, the first part of the study is the comparation among AN/DMI copolymer,PAN homopolymer and AN/MA copolymer. the second part is the comparation of solution polymerization and solid state polymerization which use the magnesium chloride as a medium. In the first part,the non-isothermal DSC studies reveal that the onset temperture of cyclization reaction of AN/DMI copolymer is lower than those of PAN and AN/MA copolymer.In the isothermal DSC studies,we can find that the ΔH value of DMI-series copolymer is about 3 to 4 times the PAN and about 1.8 times the MA-series copolymer.This means the cyclized degree of AN/DMI copolymer is relatively higher.It shows that adding DMI to the he precursor of carbon fiber does contribute to the cyclization reaction of the pre-oxidized carbon fiber. In the second part, the C13-NMR spectra of the solid state polymerization show that the ratio of isotactic structure of PAN, AN/MA copolymer and AN/DMI copolymer were 50.0%,51.8% and 58.1%,respectively.In the isothermal DSC studies, we found that the ΔH of value solid-state polymerization is higher than that of solution polymerization,those studies indicated that solid-state polymerization can effectively enhance isotactic structure result in favorite cyclization reaction of Stabilization process. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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