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pumpkin7292

铁杆木虫 (职业作家)

英国皇家资深院士

不懂的人飘过~~~~~~~~~~
只能给你顶贴了
11楼2011-04-26 12:18:49
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skill2010

金虫 (小有名气)

【答案】应助回帖

alike(金币+5): 2011-04-26 12:35:57
不能更具体点? 不过既然你做的是聚合反应,一般是要搅拌的
既然选择了远方,便会有风雨兼程
12楼2011-04-26 12:33:49
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alike

金虫 (小有名气)

总是搅拌着磁指就被粘住,如果加大速度颗粒就非常大
13楼2011-04-26 12:35:27
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llllcj

木虫 (著名写手)

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之前是什么状态,就持续什么状态。
14楼2011-04-26 12:43:41
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alike

金虫 (小有名气)

我维持不了之前的状态
15楼2011-04-26 12:49:11
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vanxulong

木虫 (正式写手)

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alike(金币+25): 2011-04-26 15:22:12
“反应混合物在室温下保持5小时。”但楼主不要只看这一句的意思,可以根据上下文联系起来推测。而且英文文献也不一定要逐字翻译,了解大概意思即可,个人浅见仅供参考
Everythingwillbeok!
16楼2011-04-26 13:05:59
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guoxueqing

铜虫 (小有名气)

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alike(金币+5): 2011-04-26 15:21:39
我的理解是把反应过的混合物在室温下静止5小时,英文中有个"then"
17楼2011-04-26 13:34:52
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root1697

木虫 (正式写手)

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alike(金币+5): 2011-04-26 15:21:47
引用回帖:
Originally posted by guoxueqing at 2011-04-26 13:34:52:
我的理解是把反应过的混合物在室温下静止5小时,英文中有个"then"

我也认为应该理解成“反应混合物在室温下静置5小时”

stand作为不及物动词,除了“站立”还有“停止”的意思哦
18楼2011-04-26 13:41:30
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guoxueqing

铜虫 (小有名气)

引用回帖:
Originally posted by alike at 2011-04-26 12:14:12:
酸 碱催化的聚合反应
第一步酸催化 要磁力搅拌
第二步 碱催化聚合

楼主可否给出这句话在的那一段,
19楼2011-04-26 16:12:15
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alike

金虫 (小有名气)

原文如下 多谢大家

PMPSQ microspheres were prepared using two-step acid–base catalyzed sol–gel process in aqueous smedium. In a typical experiment, 10g of MPTMS and 100g of water were placed in a beaker stirred by a Teflon-coated magnetic stirrer at room temperature. The solution was acidified with 0.1mL of 1M HCl. The MPTMS was initially insoluble and formed an emulsion. Then, the MPTMS oil droplets gradually disappeared and a transparent solution was obtained as the MPTMS hydrolyzed to silanol which was more soluble in water. After 5h,1mLNH4OH (5%)solution was injected to the mixture to catalyze the condensation reactions of silanol. Immediately after the addition of NH4OH, particles were formed and the solution turned opaque. The reaction mixture was then kept standing at room temperature for 5h.The resulting precipitate was filtrated with Millipore filter membrane (0.22 mm) and rinsed thoroughly with distilled water and ethanol to remove the residual NH4OH as well as unreacted monomer oroligomers
20楼2011-04-26 16:37:15
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