 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 6 | 1/1 | 返回列表 |
| 查看: 1259 | 回復(fù): 5 | |||
[求助]
RAFT試劑對(duì)強(qiáng)酸的穩(wěn)定性問(wèn)題
|
| 有做RAFT試劑的大神沒(méi)，RAFT試劑（二硫酯）對(duì)有機(jī)強(qiáng)酸如三氟乙酸的穩(wěn)定如何，能否在RAFT聚合的過(guò)程中加入強(qiáng)酸同時(shí)實(shí)現(xiàn)可控/"活性"聚合。 |
回復(fù)此樓» 猜你喜歡
285求調(diào)劑
已經(jīng)有3人回復(fù)
-
求調(diào)劑
已經(jīng)有3人回復(fù)
-
招收博士1-2人
已經(jīng)有4人回復(fù)
-
08工科 320總分 求調(diào)劑
已經(jīng)有7人回復(fù)
-
生物學(xué)一志愿985，分?jǐn)?shù)349求調(diào)劑
已經(jīng)有7人回復(fù)
-
0856材料專碩353求調(diào)劑
已經(jīng)有4人回復(fù)
-
山東省面上項(xiàng)目限額評(píng)審
已經(jīng)有4人回復(fù)
-
一志愿北京化工大學(xué)070300 學(xué)碩336求調(diào)劑
已經(jīng)有5人回復(fù)
-
生物學(xué)071000 329分求調(diào)劑
已經(jīng)有4人回復(fù)
-
一志愿華中科技大學(xué)071000，求調(diào)劑
已經(jīng)有4人回復(fù)
» 本主題相關(guān)商家推薦: (我也要在這里推廣)
» 本主題相關(guān)價(jià)值貼推薦，對(duì)您同樣有幫助:
- 關(guān)于3硫酯RAFT試劑R基活性問(wèn)題的疑問(wèn)
已經(jīng)有3人回復(fù)
- 有沒(méi)有做過(guò)RAFT試劑CPDB （二硫代苯甲酸氰基異丙酯）的同學(xué)？求經(jīng)驗(yàn)！
已經(jīng)有16人回復(fù)
- 【求助】RAFT試劑的合成
已經(jīng)有10人回復(fù)
- 【求助】RAFT試劑，R基團(tuán)的結(jié)構(gòu)為什么有影響？
已經(jīng)有9人回復(fù)
shakete
金蟲(chóng) (正式寫手)
- 應(yīng)助: 24 (小學(xué)生)
- 金幣: 3095.2
- 散金: 296
- 紅花: 3
- 帖子: 510
- 在線: 217.8小時(shí)
- 蟲(chóng)號(hào): 2059359
- 注冊(cè): 2012-10-13
- 性別: GG
- 專業(yè): 催化化學(xué)
2樓2013-06-24 18:16:53
3樓2013-06-24 20:13:49
4樓2013-06-24 20:25:30
shakete
金蟲(chóng) (正式寫手)
- 應(yīng)助: 24 (小學(xué)生)
- 金幣: 3095.2
- 散金: 296
- 紅花: 3
- 帖子: 510
- 在線: 217.8小時(shí)
- 蟲(chóng)號(hào): 2059359
- 注冊(cè): 2012-10-13
- 性別: GG
- 專業(yè): 催化化學(xué)
【答案】應(yīng)助回帖
★ ★ ★ ★
超級(jí)小笨瓜: 金幣+4, ★★★很有幫助 2013-06-25 15:50:41
超級(jí)小笨瓜: 金幣+4, ★★★很有幫助 2013-06-25 15:50:41
|
Trithiocarbonates are known to be less subjected to hydrolysis than dithiobenzoate.(47, 48) However, a UV study performed at pH = 8.0 revealed that after only 30 min at 80 °C the absorbance of the PMAA macroRAFT agent at λ = 310 nm (corresponding to the maximum absorbance of the thiocarbonylthio function) decreased by 36% meaning that one-third of the chains had lost their RAFT chain end. After 5 h, only 14% of the chains still carried an active chain end. These results clearly explain the high amount of unreacted PMAA-CTPPA observed at this pH and the consequent poor control of the polymerization. By comparison, the hydrolytic stability of PMAA-CTPPA was significantly better at pH = 3.4 since a decay of only 4% was observed after 30 min at 80 °C and the proportion of living chains was still of 75% after 5 h (see Figure S2 in Supporting Information). In the emulsion polymerization performed at pH = 3.4, PMAA-CTPPA chains do not spend more than 45 min in the aqueous phase (Figure 1) and chain end hydrolysis can thus be neglected. 不知道怎么發(fā)圖片，就把原句截下來(lái)了 http://pubs.acs.org/doi/full/10.1021/ma300875y這是文獻(xiàn)的出處 atch Emulsion Polymerization Mediated by Poly(methacrylic acid) MacroRAFT Agents: One-Pot Synthesis of Self-Stabilized Particles |
5樓2013-06-25 09:48:19
lanye6209
鐵桿木蟲(chóng) (正式寫手)
- 應(yīng)助: 25 (小學(xué)生)
- 金幣: 6369.4
- 散金: 10
- 紅花: 2
- 帖子: 423
- 在線: 149.7小時(shí)
- 蟲(chóng)號(hào): 734473
- 注冊(cè): 2009-03-29
- 專業(yè): 應(yīng)用高分子化學(xué)與物理
6樓2013-06-26 10:35:38
相關(guān)版塊跳轉(zhuǎn)
我要訂閱樓主 超級(jí)小笨瓜 的主題更新
| 6 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 材料求調(diào)劑 +5 | @taotao 2026-03-21 | 5/250 |
|
|---|---|---|---|---|
|
|
[考研] 0805 316求調(diào)劑 +3 | 大雪深藏 2026-03-18 | 3/150 |
|
|
[考研] 求助 +5 | 夢(mèng)里的無(wú)言 2026-03-21 | 6/300 |
|
|
|
[考研] 277材料科學(xué)與工程080500求調(diào)劑 +6 | 自由煎餅果子 2026-03-16 | 6/300 |
|
|
|
[考研] 306求0703調(diào)劑一志愿華中師范 +5 | 紙魚(yú)ly 2026-03-21 | 5/250 |
|
|
|
[考研] 299求調(diào)劑 +5 | shxchem 2026-03-20 | 7/350 |
|
|
|
[考研] 332求調(diào)劑 +3 | 鳳凰院丁真 2026-03-20 | 3/150 |
|
|
|
[考研] 一志愿華中科技大學(xué)，080502，354分求調(diào)劑 +5 | 守候夕陽(yáng)CF 2026-03-18 | 5/250 |
|
|
|
[考研] 296求調(diào)劑 +6 | www_q 2026-03-18 | 10/500 |
|
|
|
[考研] 323求調(diào)劑 +3 | 洼小桶 2026-03-18 | 3/150 |
|
|
|
[考研] 一志愿武漢理工材料工程專碩調(diào)劑 +9 | Doleres 2026-03-19 | 9/450 |
|
|
|
[考研] 材料學(xué)求調(diào)劑 +4 | Stella_Yao 2026-03-20 | 4/200 |
|
|
|
[考研] 353求調(diào)劑 +3 | 拉鉤不許變 2026-03-20 | 3/150 |
|
|
|
[考研] 08工學(xué)調(diào)劑 +5 | 用戶573181 2026-03-20 | 5/250 |
|
|
|
[考研] 0703化學(xué)調(diào)劑 +4 | 18889395102 2026-03-18 | 4/200 |
|
|
|
[考研] 085600材料與化工調(diào)劑 324分 +10 | llllkkkhh 2026-03-18 | 12/600 |
|
|
|
[考研] 286求調(diào)劑 +6 | lemonzzn 2026-03-16 | 10/500 |
|
|
|
[考研] 0703化學(xué)調(diào)劑 +3 | 妮妮ninicgb 2026-03-17 | 3/150 |
|
|
|
[考研] 308求調(diào)劑 +4 | 是Lupa啊 2026-03-16 | 4/200 |
|
|
|
[考研] 機(jī)械專碩325，尋找調(diào)劑院校 +3 | y9999 2026-03-15 | 5/250 |
|