作者onetotwo (展展老師~)
看板Chemistry
標題[問題] 5% weight temperature 和 glass transition temperature
時間Mon Jun 14 19:25:24 2010
To reveal the relationship between the alkyne content
and the thermal stability, thermogravimetric analysis (TGA)
and differential scanning calorimetry (DSC) measurements
of P1, P2, and P3 were performed at the scanning rate of
10C min-1 under flowing nitrogen. Unexpectedly, the
decomposition temperature increased with the increasing
alkyne content. Thus, the 5% weight loss temperature
increased in the order of P1 (234)< P2 (320)< P3(375).
Decomposition of P1 proceeded in two or three steps, whereas
P2 and P3 showed single main decompositions . The DSC
measurement of P1 did not show any transitions in the
range from -50 to 200,whereas the glass transition temperature
of P2 and P3 clearly appeared at 80 and 67 ,respectivel.
Thus, it was demonstrated that alkyne spacers serve as an
important component to improve the thermal properties of
the poly(1,8-carbazole)s.
這是從paper擷錄下來的一段話
當5% weight loss temperature隨著alkyne的數量增加而增加時
是不是代表著這穩定性越來越好?
為什麼作者要用Unexpectedly?
還有the glass transition temperature越低是不是代表熱穩定性越不好?
為什麼作者會說越低越好?
請各位高手幫我解答
先謝謝大家了~
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1F：推 joey760928:Tg高或低比較好要看你是要拿來做什麼吧 06/14 21:34
2F：推 Protoscience:樓上答非所問... 06/14 21:46
3F：推 csmap:作者用沒想到來強調alkyne spacer的好吧 06/15 01:15