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[交流]
請(qǐng)教:為什么我做懸浮老是凝膠?
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| 最近做懸浮共聚苯乙烯和丙烯腈,但是總是凝膠。用的分散劑是聚乙烯醇和磷酸鈣,以及少量的十二烷基苯磺酸鈉。其中有兩次得到了珠狀的產(chǎn)物。但是用相同的配方再做,卻總是凝膠。想請(qǐng)教一下,怎樣才能讓這個(gè)體系穩(wěn)定,生成珠狀產(chǎn)物。 |
金蟲(chóng) (小有名氣)
| You have to make sure that the ratio of monomer to initiator is in the appropriate range. On the other hand, the molecular weight and concentration of your PEO should not be too high to induce depletion interaction, which will flocculate your system, sometimes even arrest your system into a gel. Furthermore, SDS is the essential part for the stabilization of your polymer particles, the amount should be higher than a critical value to make your system quite stable for the suspension polymerization. |
捐助貴賓 (著名寫(xiě)手)
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