w********h
发帖数: 12367 | 1 for polymer brush,
I think the major coauthor is F. Brochard-Wyart,
search using this name
的 |
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a***n
发帖数: 578 | 2 hey. is this what you want? keke. it IS simpler than MBE simulation. My offer
is still there. xixi. 10K for writing this simulation tool.
This method is solving 1 dimension kinetic equation simpler than what I
thought.
the rotating speed is presenting as extra force in the system. The continum
model is used to describe the polymer.
Complete analytical solutions of film planarization during spin coating
Wu PY, Chou FC
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
146 (10): 3819-3826 OCT 1999
Document ty |
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P********e
发帖数: 544 | 3 Principles of Polymer Chemistry
Flory. |
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y****u
发帖数: 50 | 4 principles of polymer chemistry is very difficult...now I am ph.d. candidate
but I can't read through this book...
Odian's book is easier but not the easiest. |
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c****e
发帖数: 252 | 5 Hi, does anyone know how to measure the cloud point of polymer blends and what
kind of equipment be used? Thanks |
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r******0
发帖数: 2753 | 6 If you have high frequency solid NMR, maybe you can use that to study these
kind of nanocomposites. At least you can tell what polymer or functional group
is contact to clay layers and what is far away from them. These information
are helpful to the simulation guys. Doubt if someone already did that. hehe... |
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w********h
发帖数: 12367 | 7
~~~~~~what's that?
generally people are trying to get exfoliated polymer-clay
nanocomposites using in-situ polymerization. But I don't
think it is an appealing subject. |
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s*******l
发帖数: 73 | 8 My former project, In my opionion, no future,no interest! Nano seems cool, but
polymer/clay is related to nanotechnology? |
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c*******n
发帖数: 1648 | 9 You may say no interest, but some of clay/polymer mixtures are making money
now
A typical product is transparent nylon6/clay packing film. I'd like to say
that they are just not as fancy as we thought before.
but |
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y****u
发帖数: 50 | 10 After a rough reading, I know Living Radical/Carbocationic Polymerizations are
nothing. Polymer science and engineering, like many other disciplines, is
strongly market-oriented.
Why was there so much fanfare about ATRP in ACS Boston Meeting? |
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d*****s
发帖数: 313 | 11 faint, this history was very similar to the one given by gedde in
his polymer physics book. |
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w********h
发帖数: 12367 | 12 大家知道近期有什么有趣的发现么？
今天偶们的cume exam中有12个问题关于clay-polymer nanocomposites的。 |
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a****r
发帖数: 4965 | 13
The above questions are not difficult to answer.
By the way, is there anybody working on polymer-clay nanocomposites in your
department? |
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b*****h
发帖数: 29 | 14 sorry, it is ambigious on what kind of polymer you want to know.
But concerned with leaving all amphi groups on one side, you can find some
paper on copolymer sufatants. Face seperation is a useful method to relize
some fansy architecture. |
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a***n
发帖数: 578 | 15 Can a metal catalyst degrade the polymer? by what mechanism.
Let us say plantinum.
What is the mechanism for 热降解?
Thanks. |
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d****n
发帖数: 237 | 16 你去看看文献吧，这些我就不懂了，爱莫能助。
书要你自己去你所在学校的图书馆里去查，
我知道有本杂志，Polymer Degradation and Stability。
dissociate |
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a***n
发帖数: 578 | 17 en. just found several good papers. some papers talked about oxygen dissociate
on Pt surface and produce OH. and O2H. radicals and attack alfa carbon to
degrade the polymers. partially as I assumed.
chain |
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U******n
发帖数: 75 | 18 Anybody trying to image polymer single chain using any of the scanning probe
microscopy technique? |
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m*******r
发帖数: 66 | 19 Boss want me to do chemcial functionalization of PEI,
then make crsoolink under UV,
BUT I know little about polymer, would anyone can help
me? give me some advise or references?
Thanks in advance!! |
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b*****h
发帖数: 29 | 20 I need some polymer can sustain 5 M NaOH 10 min.
this should be dilute enough so can fill in `100-200 nm channel then I will
polymerize it.
also can any one suggest some methods let this kind of fibre be magetic?
the modular should be big.
Thanks. |
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a***n
发帖数: 578 | 21 I seldom told new ideas to strangers. But I am willing to think of unexplained
experiment or obseveration. Anyway, permanent magnetic polymer or molecular
crystal are just recent proposed concepts. There are only few researches about
it.
It may waste time to look at that direction.
itself |
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b*****h
发帖数: 29 | 22 our group want to use polymer or sol-gel mixature make some stamp so transfer
from male mask to female.
naomally guys just use PDMS but this time it must be stiff and not brittle.
does anyone have any idea?
if you really done this before or see some successful cases, please cited.
guess is also welcomed!
by the way, has anyone do sol-gel while no cracks before? |
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w********h
发帖数: 12367 | 23 check Whitesides' papers.
PDMS is his model polymer.
brittle. |
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f*****g
发帖数: 27 | 24 我想在Mechanism of Actuation of Conducting Polymers
方面做些工作， 大家能否推荐些相关的教科书，或可能用到
得理论，例如渗透. |
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b*****h
发帖数: 29 | 25 need to grow conductive polymer fibres in templates. but I even do not know
anything related with this. is there any good text book about it?
something new and easy to read? |
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c*******n
发帖数: 1648 | 26 Do you know how to correlate the flexibilty of a polymer backbone with the
lithium ion mobility? |
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c*******n
发帖数: 1648 | 27 I don't know details either, I also want to get comments from persons in this
area. You may not want to touch this, which is already dated and recently
commercialized technology. I know Mayes AM at MIT are doing somework on this.
You can google it. Actually I don't even know what polymer is used in industry
although PEO is academically wide dicussed in the past decade. |
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R***c
发帖数: 648 | 28 I have two Chinese books about this topic,
(1)Gaofenzi luohewude dianzigonggeng, Beingjing Univ. Press, 1990.
Translate from E.Tsuchida etc. edit, Functions and applications of
macromolecular complexes. Vol.3: electronic functions published by Japan
polymer complexes society.
(2)Gaofenzijinshuluohewu, Beijing Univ. Press, 1999.6
Translated from F.Ciardeli, E.Tsuchida & D.Wohrle edit, Macromolecular Metal
Complexes, 1996, by Springer press.
In these two books, they discussed very detaily about th |
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c***r
发帖数: 4631 | 29 Do you ever think grow polymer-lithium battery from diblock or tri-block
copolymer directly on the IC? Or call it "Nano-battery"?
in
recently
with |
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c*******n
发帖数: 1648 | 30 You got almost everything. But how to define the reaction? Lithium ion do
coordinate with (EO)6. You are right, lithium polymer complex is used as
current transport medium instead of anode, cathode...That's why I called it
electrolyte.
Energy density is low, that's why people want to understand what's the
transporting mechanism in order to increase energy density later by
manupulating molecular level parameter, But maybe it's just a dream of
scientists:)
consider
electrolyte
processed
these
sto |
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c*******n
发帖数: 1648 | 31 Right, in the near future, Li-polymer battery inside the body can be recharged
by electron waves.
better
tri-block |
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m***n
发帖数: 266 | 32 旧话重提。 关于温度。如果只有水解，我觉得当polymer is at a
temperatuer higher than its Tg, it should degrade faster as
it becomes more amorphous. |
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c***r
发帖数: 4631 | 33
topics
trying
there is a review paper of polymer/clay nanocomposite by Suprakas Sinha Ray,
and Masami Okamoto at Science direct. 100 pages, should be enough for this
area. |
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b**s
发帖数: 589 | 34 My former advisor was doing something about inorganic-polymer composite via
sol-gel method
and |
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h**k
发帖数: 48 | 35 在
http://www.mit.edu/afs/athena/course/10/10.491-md/www/
CourseNotes/Polymer_CN_Glossary.html#p:
上有定义分别为：
polymer:
a substance composed of macromolecules. (IUPAC)
macromolecule:
a molecule of high relative molecular mass, the structure of which essentially
comprises the multiple repetition of a number of constitutional units. (IUPAC)
俺被告糊涂了，请各位大虾指点指点，谢谢。 |
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b**s
发帖数: 589 | 36 is biodegradable polymer fine powder also available on the market? |
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u****d
发帖数: 2117 | 37 糊涂中
请学polymer的同学帮我科普一下？
多谢！ |
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o****e
发帖数: 1011 | 38 "polymer"? 这个问题上能这样泛指吗？ |
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d****g
发帖数: 164 | 39 This is an interesting question. Who are those people?
Usually we can only observe heterogenous crystallization due to the impurities
in commercial polymers. As far as I know, homogeneous crystalliztation was
observed in purified cis-polyisoprene.
constant |
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a***n
发帖数: 578 | 40 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. |
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b*o
发帖数: 47 | 41 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. |
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u****d
发帖数: 2117 | 42 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. |
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b*o
发帖数: 47 | 43 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 |
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a***n
发帖数: 578 | 44 Since conducting polymer has similiar conductivity as copper, so I assume its
hole mobility is at same order as electron mobility in metal. Is it right?
thanks. Who studying this pls give some hints. thanks. |
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l*****o
发帖数: 82 | 45
Which polymer?
In my memory, most are not. Much much smaller, even with the same conductivity. |
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a***n
发帖数: 578 | 46 Thanks for your message.
I think hole mobility in polymer should be related to its conductivity. Why it
is much smaller? I got some data for the hole mobility. The largest is 0.1 ~ 1
cm2/Vs for field effect hole mobility, reponsding to 10 cm2/Vs for defect free
hole mobility.
I am quite confused at all those concepts such as hole drift velocity,
field-effect hole mobility and defect free hole mobility.
I am checking some book talking about them. But still prefer some book
especially talking abou |
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l*****o
发帖数: 82 | 47 I don't know either. But keep two fact in mind:
1. conductivity is not only the function of mobility, but that of carrier
density.
2. The charge carriers in polymer are not free carrier. Some are polarons, some
are solitons. |
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c*****e
发帖数: 238 | 48 no person doing purely polymer science...(my stupid opinion) |
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p*****d
发帖数: 40 | 49 what do u mean by pure polymer sci. how about synthetic method? just
guessing... |
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w********h
发帖数: 12367 | 50 我懂得不多，做不出那种高屋建瓴的预测。
几个方向吧，瞎说说，都是一大块一大块的：
（1）Sharpless在宣传他的click chemistry，高分子合成设计仍然是重要方向；
（2）复杂系统的高分子动力学，包括生物体系；
（3）功能性先进材料---〉更优化，以全面代替传统材料。
//I am not saying polymer people should not care about fundamentals,
just instead. otherwise, nothing to deeper those directions.
coz
LONG
science, |
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