m******k
发帖数: 447 | 1 How to avoid the formation of micelles when using PVA as the surfactant in
the suspension polymerization?
It's so hard to filter when the suspension reaction is done. So many papers
showed they used filtration method to separate particles from water phase. I
don't know how they make it. I cannot use centrifuge and decant method
because of ....
This question bother me so much. Tons of thanks for any suggestion. |
d****n
发帖数: 237 | 2 for suspension reactions, the particle size ought to be large enough to
filter after the solidification.
are you sure yours is suspension? is it emulsion? |
m******k
发帖数: 447 | 3 Most particles are around 10 microns. While I cannot filter to collect
particles. I guess there are some emulsion particles inside. Do you know any
way to avoid the formation of micelles or anyway to filter the suspension?
Tons of thanks.
【在 d****n 的大作中提到】
: for suspension reactions, the particle size ought to be large enough to
: filter after the solidification.
: are you sure yours is suspension? is it emulsion?
|
o*******r
发帖数: 30 | 4 加入高价电解质试试，或者将pH调到极端值
papers
I
【在 m******k 的大作中提到】
: How to avoid the formation of micelles when using PVA as the surfactant in
: the suspension polymerization?
: It's so hard to filter when the suspension reaction is done. So many papers
: showed they used filtration method to separate particles from water phase. I
: don't know how they make it. I cannot use centrifuge and decant method
: because of ....
: This question bother me so much. Tons of thanks for any suggestion.
|
r******0
发帖数: 2753 | 5 slow down the stirring. The major difference between emulsion polymierzation
and suspension polymerization is the initiator. One is water soluble, the
other is oil soluble. If you want to get bigger suspension particles, slow
down the stirring might be helpful. |
h**j
发帖数: 24 | 6 What is the problem with filtration? You can't get the suspension through or
you can get it through but nothing left. When my particle is < 5 micron, it
is very hard to get the suspension through filter paper, but 10 micron I
have no problem. By the way, I use Tyvek 1 micron filter paper. What kind
are you using?
any
?
【在 m******k 的大作中提到】
: Most particles are around 10 microns. While I cannot filter to collect
: particles. I guess there are some emulsion particles inside. Do you know any
: way to avoid the formation of micelles or anyway to filter the suspension?
: Tons of thanks.
|
m******k
发帖数: 447 | 7 The problem is that I need to control the particle size around 10 microns
and cannot slow down the stirring.
polymierzation
【在 r******0 的大作中提到】
: slow down the stirring. The major difference between emulsion polymierzation
: and suspension polymerization is the initiator. One is water soluble, the
: other is oil soluble. If you want to get bigger suspension particles, slow
: down the stirring might be helpful.
|
m******k
发帖数: 447 | 8 I cannot get the suspension through the fritted Buchner funnel although it's
the coarse size.
or
it
【在 h**j 的大作中提到】
: What is the problem with filtration? You can't get the suspension through or
: you can get it through but nothing left. When my particle is < 5 micron, it
: is very hard to get the suspension through filter paper, but 10 micron I
: have no problem. By the way, I use Tyvek 1 micron filter paper. What kind
: are you using?
:
: any
: ?
|
r******0
发帖数: 2753 | 9 Then centrifuge instead of filtration.
【在 m******k 的大作中提到】
: The problem is that I need to control the particle size around 10 microns
: and cannot slow down the stirring.
:
: polymierzation
|
