| 5 | 1/1 | 返回列表 |
| 查看: 2356 | 回復: 11 | |||
| 本帖產生 1 個 PEPI ,點擊這里進行查看 | |||
| 當前只顯示滿足指定條件的回帖,點擊這里查看本話題的所有回帖 | |||
lastzealot新蟲 (著名寫手)
【亂世的奸雄】
|
[求助]
請問大蝦們在做DSC表征聚合物晶體時有沒有見過熔融雙峰的情況
|
||
|
最近做了幾次PCL及共混物的結晶動力學,發(fā)現(xiàn)如果升溫較慢,熔融峰會分裂成為兩個,不知道這兩個峰各代表什么?為什么會分裂? 請各位高手指教啊。 |
金蟲 (著名寫手)
|
To determine whether the origin of the multiple melting behavior is caused by crystal modification, WAXD should be performed under different isothermal crystallization temperatures or non-isothermal scanning rates to observe whether the acquired WAXD patterns are identical. The same diffraction peaks at the same location, which indicates that they have the same crystal structure over a wide range of temperatures and heating rates. A faster scanning rate,in my opinion, however, will not provide sufficient time for the samples to recrystallize; thus, in your experiment, you will observe the fact that the number and degree of perfection of the recrystallized materials diminishes, leading to an increase in the area ratio and decrease in the magnitude of the exothermic peak. These results could directly prove that only part of the crystals that correspond to low-thermal endotherm melted and recrystallized during the heating run. To check whether the multiple melting behavior is caused by morphology, SAXS will be used to determine whether the lamellar thickness has been changed. And others possible factors can be separately confirmed by means such as fractionation, relaxation operation and so on. To sum up: I prefer empolying the melting-recrystallization-remelting model to interpret your results in this special case. Best wishes~~ |

鐵桿木蟲 (著名寫手)

至尊木蟲 (文壇精英)
至尊木蟲 (職業(yè)作家)
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[基金申請] 被我言中:新模板不強調格式了,假專家開始管格式了 +4 | beefly 2026-03-14 | 4/200 |
|
|---|---|---|---|---|
|
[考研] 0703化學調劑 ,六級已過,有科研經歷 +8 | 曦熙兮 2026-03-15 | 8/400 |
|
|
[考研] 293求調劑 +7 | zjl的號 2026-03-16 | 12/600 |
|
|
[考研] 302求調劑 +9 | 負心者當誅 2026-03-11 | 9/450 |
|
|
[考研] 332求調劑 +6 | Zz版 2026-03-13 | 6/300 |
|
|
[考研] 有沒有道鐵/土木的想調劑南林,給自己招師弟中~ +3 | TqlXswl 2026-03-16 | 7/350 |
|
|
[考研] 0854可跨調劑,一作一項核心論文五項專利,省、國級證書40+數一英一287 +3 | 小李0854 2026-03-16 | 3/150 |
|
|
[考研] 東南大學364求調劑 +5 | JasonYuiui 2026-03-15 | 5/250 |
|
|
[基金申請]
今年的國基金是打分制嗎?
50+3
|
zhanghaozhu 2026-03-14 | 3/150 |
|
|
[考研] 0703化學調劑,求各位老師收留 +8 | 秋有木北 2026-03-14 | 8/400 |
|
|
[考研] 26考研一志愿中國石油大學(華東)305分求調劑 +3 | 嘉年新程 2026-03-15 | 3/150 |
|
|
[考研] 中科大材料專碩319求調劑 +3 | 孟鑫材料 2026-03-13 | 3/150 |
|
|
[考研] 復試調劑 +3 | 呼呼?~+123456 2026-03-14 | 3/150 |
|
|
[考研] 學碩285求調劑 +13 | Wisjxn 2026-03-12 | 46/2300 |
|
|
[考研] 求材料調劑 085600英一數二總分302 前三科235 精通機器學習 一志愿哈工大 +4 | 林yaxin 2026-03-12 | 4/200 |
|
|
[考研] 求材料調劑 +5 | 隔壁陳先生 2026-03-12 | 5/250 |
|
|
[考研] 290求調劑 +9 | ADT 2026-03-11 | 9/450 |
|
|
[考研] 304求調劑 +7 | 7712b 2026-03-13 | 7/350 |
|
|
[考研] 270求調劑 085600材料與化工專碩 +3 | YXCT 2026-03-11 | 3/150 |
|
|
[考研] 081200-11408-276學碩求調劑 +3 | 崔wj 2026-03-12 | 4/200 |
|