w********h
发帖数: 12367 | |
t******l
发帖数: 3060 | 2 those are too famous..
any very hot and current one?
anyone like to introduce?
【在 w********h 的大作中提到】
: http://www.che.rochester.edu/Courses/CHE286/scientists.htm
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a***n
发帖数: 578 | 3 introduce Grubbs' current fancy chemistry:
polymer template.
basic idea is to have a substrate binding with certain sequence acceptor
sites. Those acceptor sites arrange in a pattern or a line. Then target
oligomers come in and sit on those acceptor sites. Add catalysts in, and
target polymer got sythensis.
hehe. pretty fancy. Interested guy search his papers. Don't know whether he
published this topic.
cyclic polymer.
He can make [ch2-ch2] as cyclic polymer. The reason to make this is because
i
【在 t******l 的大作中提到】
: those are too famous..
: any very hot and current one?
: anyone like to introduce?
|
t******l
发帖数: 3060 | 4 thanks..
hehe.....
i guess first one did not publish. the 2nd one is well established, very famous.
still confused by the 1st idea. what 's advantage?
control the MW? or get well defined structure?
【在 a***n 的大作中提到】
: introduce Grubbs' current fancy chemistry:
: polymer template.
: basic idea is to have a substrate binding with certain sequence acceptor
: sites. Those acceptor sites arrange in a pattern or a line. Then target
: oligomers come in and sit on those acceptor sites. Add catalysts in, and
: target polymer got sythensis.
: hehe. pretty fancy. Interested guy search his papers. Don't know whether he
: published this topic.
: cyclic polymer.
: He can make [ch2-ch2] as cyclic polymer. The reason to make this is because
|
a***n
发帖数: 578 | 5 get well defined structure. You can choose exact sequence by using different
acceptor sites.
Ideally, it can make man-made DNA or very complex bio-molecule or whatever.
this is big bucks funded. the name is recognization process? don't know.
cooperate with Prof. Stoddard at UCLA.
famous.
he
because
polymer.
【在 t******l 的大作中提到】
: thanks..
: hehe.....
: i guess first one did not publish. the 2nd one is well established, very famous.
: still confused by the 1st idea. what 's advantage?
: control the MW? or get well defined structure?
|
t******l
发帖数: 3060 | 6 sounds coool and exciting.
thanks for ur information.
【在 a***n 的大作中提到】
: get well defined structure. You can choose exact sequence by using different
: acceptor sites.
: Ideally, it can make man-made DNA or very complex bio-molecule or whatever.
: this is big bucks funded. the name is recognization process? don't know.
: cooperate with Prof. Stoddard at UCLA.
:
: famous.
: he
: because
: polymer.
|
c*********e
发帖数: 119 | 7
~~~~~~~
I know from the newest C&EN that he got an award funding from SQB.
【在 a***n 的大作中提到】
: introduce Grubbs' current fancy chemistry:
: polymer template.
: basic idea is to have a substrate binding with certain sequence acceptor
: sites. Those acceptor sites arrange in a pattern or a line. Then target
: oligomers come in and sit on those acceptor sites. Add catalysts in, and
: target polymer got sythensis.
: hehe. pretty fancy. Interested guy search his papers. Don't know whether he
: published this topic.
: cyclic polymer.
: He can make [ch2-ch2] as cyclic polymer. The reason to make this is because
|
b*o
发帖数: 47 | 8 The first idea sounds a lot like the Molecular Imprinting idea Tanaka's group
did theoretical studies a few years ago. Looking forward to his publications.
he
because
polymer.
【在 c*********e 的大作中提到】
:
: ~~~~~~~
: I know from the newest C&EN that he got an award funding from SQB.
|
w********h
发帖数: 12367 | 9 oh, you are coming back.
please think about my question about correlation length...
group
publications.
【在 b*o 的大作中提到】
: The first idea sounds a lot like the Molecular Imprinting idea Tanaka's group
: did theoretical studies a few years ago. Looking forward to his publications.
:
: he
: because
: polymer.
|
u****d
发帖数: 2117 | 10 I also want to know about the correlation length
it is also called screening length?
some one can recommend some websites about it please?
I am new on polymer.
【在 w********h 的大作中提到】
: oh, you are coming back.
: please think about my question about correlation length...
:
: group
: publications.
|
|
|
b*o
发帖数: 47 | 11 Just had a long vacation. I remeber that I read it somewhere saying
entanglement length, as estimated from viscoelasticity measurment and
theoretical models, is usually several times longer than the correlation
length of polymer solutions of the same concentration as measured by
light/neutron scattering (?) experiment. Forget the original literature and
the details, just this conclusion vaguely in my memory. These two concepts
seem easy to understand with de Gennes' drawing in his book.
As for t
【在 w********h 的大作中提到】
: oh, you are coming back.
: please think about my question about correlation length...
:
: group
: publications.
|
w********h
发帖数: 12367 | 12 pls see #4968 and say say your opinions
it.
【在 b*o 的大作中提到】
: Just had a long vacation. I remeber that I read it somewhere saying
: entanglement length, as estimated from viscoelasticity measurment and
: theoretical models, is usually several times longer than the correlation
: length of polymer solutions of the same concentration as measured by
: light/neutron scattering (?) experiment. Forget the original literature and
: the details, just this conclusion vaguely in my memory. These two concepts
: seem easy to understand with de Gennes' drawing in his book.
: As for t
|
w********h
发帖数: 12367 | 13 Probably you are mentioning this?
Tao H, Huang C, Lodge TP
Correlation length and entanglement spacing in concentrated hydrogenated
polybutadiene solutions
MACROMOLECULES 32 (4): 1212-1217 FEB 23 1999
as to screening length,
it starts to show up at the overlap concentrtation,
while the tube diameter shows up at entangled concentration.
it.
【在 b*o 的大作中提到】
: Just had a long vacation. I remeber that I read it somewhere saying
: entanglement length, as estimated from viscoelasticity measurment and
: theoretical models, is usually several times longer than the correlation
: length of polymer solutions of the same concentration as measured by
: light/neutron scattering (?) experiment. Forget the original literature and
: the details, just this conclusion vaguely in my memory. These two concepts
: seem easy to understand with de Gennes' drawing in his book.
: As for t
|
u****d
发帖数: 2117 | 14 can you guys tell me what is the Scaling Law?
thanks
【在 b*o 的大作中提到】
: Just had a long vacation. I remeber that I read it somewhere saying
: entanglement length, as estimated from viscoelasticity measurment and
: theoretical models, is usually several times longer than the correlation
: length of polymer solutions of the same concentration as measured by
: light/neutron scattering (?) experiment. Forget the original literature and
: the details, just this conclusion vaguely in my memory. These two concepts
: seem easy to understand with de Gennes' drawing in his book.
: As for t
|
w********h
发帖数: 12367 | 15 de Gennes decribes the scaling concept without introducing the accurate
prefactors. it focuses on the relationship between two or more important
parameters. for example, tube diameter "a" with concentration "fi",
a---fi^(-2/3). while the correlation length ---fi^(-1) in theta condition.
and
it.
【在 u****d 的大作中提到】
: can you guys tell me what is the Scaling Law?
: thanks
|
u****d
发帖数: 2117 | 16 到底screening length 和correlation length是一回事吗？
i am confused
thanks
【在 w********h 的大作中提到】
: Probably you are mentioning this?
: Tao H, Huang C, Lodge TP
: Correlation length and entanglement spacing in concentrated hydrogenated
: polybutadiene solutions
: MACROMOLECULES 32 (4): 1212-1217 FEB 23 1999
: as to screening length,
: it starts to show up at the overlap concentrtation,
: while the tube diameter shows up at entangled concentration.
:
: it.
|
w********h
发帖数: 12367 | 17 yes, they are the same thing.
also called "mesh size".
and
concepts
understand
【在 u****d 的大作中提到】
: 到底screening length 和correlation length是一回事吗？
: i am confused
: thanks
|
u****d
发帖数: 2117 | 18 thanks
【在 w********h 的大作中提到】
: yes, they are the same thing.
: also called "mesh size".
:
: and
: concepts
: understand
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