e****m
发帖数: 8 | |
m*****e
发帖数: 1506 | 2 温度，浓度，有否阻聚剂
【在 e****m 的大作中提到】
: 谢谢了
|
e****m
发帖数: 8 | 3 Thanks for the reply.
Actually I am making Polyacrylamide gel under room temperature. My current
working formula is list below:
Acrylamide (monomer) (~ 8%, wt)
bis-acrylamide (crosslinker)
Redon: Tetramethylethylenediamine/ammonium persulfate
solvent: water/ethylene (10:1)
This formula works pretty well. However, I am trying to replace water/
ethylene glycol with pure ethylene glycol but the crosslinking cannot be
initiated even after two days. I tried to vary the reaction temperature but
it didn't help.
Could you please give me some suggestion on how to solve this problems? |
m*****e
发帖数: 1506 | 4 水的极性大，相同温度下acrylamide聚合速率大得多。你看是不是把浓度或温度提高些
，或者加些引发剂
【在 e****m 的大作中提到】
: Thanks for the reply.
: Actually I am making Polyacrylamide gel under room temperature. My current
: working formula is list below:
: Acrylamide (monomer) (~ 8%, wt)
: bis-acrylamide (crosslinker)
: Redon: Tetramethylethylenediamine/ammonium persulfate
: solvent: water/ethylene (10:1)
: This formula works pretty well. However, I am trying to replace water/
: ethylene glycol with pure ethylene glycol but the crosslinking cannot be
: initiated even after two days. I tried to vary the reaction temperature but
|
e****m
发帖数: 8 | 5 Could you please tell me what's the influence of polarity of solvents on the
polymerization? Do you mean I should try to increase the initiator's
concentration?
Thanks a lot. |
m*****e
发帖数: 1506 | 6 溶剂极性对聚合速率的影响非常大，尤其是自由集聚和，可以翻翻经典教科书。增加自
由基浓度应该有帮助
the
【在 e****m 的大作中提到】
: Could you please tell me what's the influence of polarity of solvents on the
: polymerization? Do you mean I should try to increase the initiator's
: concentration?
: Thanks a lot.
|
a****d
发帖数: 524 | 7 the polar solvent can stabilize the transaction radicals, and lower the
energy of transition state, so the rate will be accelerated, try to
introduce a little bit of AIBN etc ...
the
【在 e****m 的大作中提到】
: Could you please tell me what's the influence of polarity of solvents on the
: polymerization? Do you mean I should try to increase the initiator's
: concentration?
: Thanks a lot.
|
e****m
发帖数: 8 | |
