作者onetotwo (展展老师~)
看板Chemistry
标题[问题] 5% weight temperature 和 glass transition temperature
时间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.
这是从paper撷录下来的一段话
当5% weight loss temperature随着alkyne的数量增加而增加时
是不是代表着这稳定性越来越好?
为什麽作者要用Unexpectedly?
还有the glass transition temperature越低是不是代表热稳定性越不好?
为什麽作者会说越低越好?
请各位高手帮我解答
先谢谢大家了~
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1F：推 joey760928:Tg高或低比较好要看你是要拿来做什麽吧 06/14 21:34
2F：推 Protoscience:楼上答非所问... 06/14 21:46
3F：推 csmap:作者用没想到来强调alkyne spacer的好吧 06/15 01:15