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[求助]
RAFT試劑對(duì)強(qiáng)酸的穩(wěn)定性問題
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| 有做RAFT試劑的大神沒，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聚合的過程中加入強(qiáng)酸同時(shí)實(shí)現(xiàn)可控/"活性"聚合。 |
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shakete
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3樓2013-06-24 20:13:49
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shakete
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【答案】應(yīng)助回帖
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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
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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
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