a*i
发帖数: 1652 | 1 just found that styrene was self-polymerized in a SS tube. same styrene in a
PE tube was not polymerized. Stainless steel might have initiate the
polymerization.
anybody with similar experiences? |
t***u
发帖数: 20182 | |
S*****n
发帖数: 6055 | 3 SS has Cr, which is a good catalyst for ethylene polymerization. Not sure
whether it works for styrene or not...
a
【在 a*i 的大作中提到】
: just found that styrene was self-polymerized in a SS tube. same styrene in a
: PE tube was not polymerized. Stainless steel might have initiate the
: polymerization.
: anybody with similar experiences?
|
t***u
发帖数: 20182 | |
b******0
发帖数: 45 | 5 Styrene is self-polymerizable without initiator. are they
compared in same conditions? same temperature, same time,... |
a*i
发帖数: 1652 | 6 yes. Perhaps I just discovered something big in Polymer Science...
will run GPC...
【在 b******0 的大作中提到】
: Styrene is self-polymerizable without initiator. are they
: compared in same conditions? same temperature, same time,...
|
a********c
发帖数: 60 | 7 Most likely you got somethingelse there. I'd be suprised if you can
repeat it.
in a
【在 a*i 的大作中提到】
: just found that styrene was self-polymerized in a SS tube. same styrene in a
: PE tube was not polymerized. Stainless steel might have initiate the
: polymerization.
: anybody with similar experiences?
|
a*i
发帖数: 1652 | 8 I use a precision pump to deliver styrene. The outlet is a metal fitting.
After I found that the metal fitting was totally blocked, I replaced it with
a new one. If I don't purge out styrene, the styrene would polymerize in
the metal fitting. I can see sticky/viscous stuff extruded out from the
fitting initially; after that styrene will come out. If I stop the pump and
start it again after a day, the same thing will happen.
The metal is SS 316.
【在 a********c 的大作中提到】
: Most likely you got somethingelse there. I'd be suprised if you can
: repeat it.
:
: in a
|
r******0
发帖数: 2753 | 9 I bet redox initiation.
with
and
【在 a*i 的大作中提到】
: I use a precision pump to deliver styrene. The outlet is a metal fitting.
: After I found that the metal fitting was totally blocked, I replaced it with
: a new one. If I don't purge out styrene, the styrene would polymerize in
: the metal fitting. I can see sticky/viscous stuff extruded out from the
: fitting initially; after that styrene will come out. If I stop the pump and
: start it again after a day, the same thing will happen.
: The metal is SS 316.
|
a********c
发帖数: 60 | 10 interesting.
repeat the experiment by soaking your metal fitting in a beaker full of
styrene see if it will polymerize.- it should not.
Then only possibility would be you created a oxygen starving condition
when you pump the St. Additionally, you created high heat.
fitting.
with
in
and
【在 a*i 的大作中提到】
: I use a precision pump to deliver styrene. The outlet is a metal fitting.
: After I found that the metal fitting was totally blocked, I replaced it with
: a new one. If I don't purge out styrene, the styrene would polymerize in
: the metal fitting. I can see sticky/viscous stuff extruded out from the
: fitting initially; after that styrene will come out. If I stop the pump and
: start it again after a day, the same thing will happen.
: The metal is SS 316.
|
