n*********r
发帖数: 18 | 1 1.1.3. Device stability
The reliability of OLEDs has been improved significantly during the last
decade as a deeper understanding has been achieved on the fundamental
processes of charge injection, transport, and recombination.
It was revealed that the performance of OLEDs, in terms of lifetime and
efficiency, could be affected by the solid-state morphology, such as the
organic thin films uniformity, thickness, and homogeneity. Based on results
from scanning electron microscopy (SEM), transmissi |
|
w********h
发帖数: 12367 | 2 标 题: Carbon Nanotube (1)
发信站: 日月光华 (2002年08月05日08:05:34 星期一), 站内信件
Carbon Nanotube Composites
The first realized major commercial application of MWNTs is their use as ele
ctrically conducting components in polymer composites. Depending on the poly
mer matrix, conductivities of 0.01 to 0.1 S/cm can be obtained for 5% loadin
g; much lower conductivity levels suffice for dissipating electrostatic char
ge (30). The low loading levels and the nanofiber morphology of the MWNTs al
low electronic condu |
|
c********n
发帖数: 7 | 3 Micelle is not another kind of macromolecule, not any kind of
new maerials, it is just a morphology, a form of aggregation
with core-shell shape. |
|
w******r
发帖数: 43 | 4
For the block copolymer micelles:
DLS can tell you the Rh of your micelles, it is best for sphere.
The best way is cryo-TEM. You can watch the morphology directly.
The convient and good is SAXS, you fitting the fact S(q) with different model.
The most accurate way is SANS. The recent results show that the micelle core
is not exactly close-packed.(Mortensen)
You can also measure the d1 by NMR to infer the micelle structure.
Another very good way is fluorescene spectrum. |
|
w******r
发帖数: 43 | 5 These papers are non-equilibrium system, because they use PS as one of blocks.
PS has high Tg than rm T.
There are a lot work is about both the hydrophobic and hydrophilic have low
Tg,
so they can reach equilibrium.
Bates have a paper in JPS 2002 using cryo-TEM to characterize the micelle
morphology.
I know amphiphilic block copolymer can form spherical, cylinder, versicle,
flower and onion and networw or bicontinuous micelles. |
|
a****r
发帖数: 4965 | 6 Wu, Zenggang; Zhou, Chixing; Qi, Rongrong. The preparation of phenolic
resin/montmorillonite nanocomposites by suspension condensation polymerization
and their morphology. Polymer Composites (2002), 23(4), 634-646. |
|
n****m
发帖数: 5 | 7
My recommendation:
1. Elizabeth M. Slayter, Henry S. Slayter, Light and Electron Microscopy,
Cambridge University Press, 1992. (clear and concise, unified picture on both
light and electron microscopy.)
2. Linda C. Sawyer, David T. Grubb, Polymer Microscopy, Chapman & Hall, 1987.
(have a lot of details for polymer scientists.)
3. Atlas of Polymer Morphology, Arthur E. Woodward, Oxford University Press,
1989. (show of some nice picture, don't buy it, borrow it from library). |
|
r****r
发帖数: 14 | 8 The crystallization of polymer is different from those of small molecules in
which the Tm and Tc can be very close. For polymer, quite large supercooling
(the difference between Tm and Tc) is needed for the nucleation. The Tm is
determined by the Tc. You can check the Gibbs-Thompson equation to find the
relationship. Normally, larger Tc leads to larger Tm. Tc also determines the
morphology. At high Tc, for flexible and semi-rigid polymer, regular chain
folding lamellae structure can be formed fr |
|
U******n
发帖数: 75 | 9 if you look at your bearing and you saw more than two peaks. that means you
can get the ratio of peak A/ peak B and also can get the average height of A
relative to B.
and on the morphology, if you sure that peak A is "higher" structure, then
from the curve below, you can "calculate" the volume of A at certain scan
size.
but to compare the surface coverage, i think gain analysis is more useful than
bearing. |
|
c*****e
发帖数: 238 | 10 最好详细说说,当初好像记得这个,现在记不清了.
不过应该是说的morphology的演变吧,比如coarsening什么的? |
|
c*****e
发帖数: 238 | 11 It has something to do with the phase morphology.
I think the spinodal decomposition you referred to usually corresponds to
bicontinuous phases, in that case, the hydrodynamic effects dominate over
normal diffusion induced by the nuclei. |
|
U******n
发帖数: 75 | 12 I dun think is the migration of Au/Pd into PMMA. do you check the height? it
may be the deformation of the PMMA or change in the surface morphology.
anyone can tell me if that may possible cause by the swollen by your so-call
"chemical environment" ?? i mean, when taking in or out from that storage.
anyway, now you bought the interest to me and others also
well, i also wish i am a wisom of that. good luck to u
>
Temperature
Symposium,
metal,
this
old
lower
either. |
|
c****n
发帖数: 134 | 13 A thermoplastic elastomer...and I need to see the morphology
for butadiene and styrene, it is well-known.
but now I need to taint a poly(vinyl ether).
any idea? perhaps I can acknowledge you in a paper :)
(this is last result for a paper.
To measure the TEM, my boss has to cooperate with another prof.
with a promise of coauthorship...I am sad. I worked so hard, it is too easy
for the cooperator!) |
|
c****n
发帖数: 134 | 14
thanks a lot! can u give me the reference?
I searched "sci-finder" with "morphology, poly(vinyl ether)"
Looks like it could be tainted when there is pendant -OH group in poly(vinyl
ether). |
|
w******r
发帖数: 43 | 15 what is your means about phase diagram?
Block copolyme can form different morphologies in dilute solutions.
With increase of concentration, the micelle solution could be BCC, FCC
structure. TPL has some papers about the characterization and kinetic
transition between BCC<>FCC.
Bates reported various micelle morphlogoies formed
from PBD-PEO diblock copolymers. They did a lot of cryoTEM and got very nice
images.
(1) Jain, S.; Bates, F. S. Science 2003, 300, 460.
(2) Won, Y.-Y.; Brannan, A. K.; Dav |
|
c*******n
发帖数: 1648 | 16 Or block copolymer system? to get well defined particle size and morphology?
After that, cleave one block off to get particles:) |
|
t******l
发帖数: 3060 | 17 a huge topic.
for morhphology review. u can check Chem. Rev. 2001, Vol 101, p 3869 |
|
D***e
发帖数: 435 | 18 多谢。
再问一下。block copolymer 的contour length跟分子量之间有
什么关系或是公式吗？这个contour length 是怎么得到的。 |
|
t******l
发帖数: 3060 | 19 ft... i donot know.
let Wonderlich answer u bah. |
|
c*****e
发帖数: 238 | 20 Generally the contour length is the number of physical segments, so depends
on the consistent length.
The molecular weight also depends on the chemical composition of each chemical
segments.
Actually in most physics context, the contour length might be the number of
physical segments scaled by the factor of a segmental volume devided by
the cube of a segment length (since the segment is not a strict cube) |
|
|
l**l
发帖数: 860 | 22 或者叫做: capillary fluctuation
一般是用来解释表面粗糙的morphology,我想知道
这个理论是否可以用来解释波浪状的表面结构. 我的意思说 波幅在几十个micrometers
非常规则的波浪. (跟水面的波纹很像,而不是粗糙度roughness的那种nm结构.) |
|
C***S
发帖数: 175 | 23 Thanks.
My purpose is to calculate the TFE sequence length in Nafion, which
is crucial for the crystalization of Nafion.
Based on this, we can cooperate our NMR data to propose a reasonable
morphology of Nafion. |
|
C***S
发帖数: 175 | 24 No. I am working on Nafion system, the chemical formula is
((CF2)6.5CF(CF2)6.5)n
|
OCF2CF(CF3)OCF2CF2SO3H
I just read the paper, which claims that even at low level hydration level,
Nafion morphology is composed by polymer aggregates dispersed in water. To me,
this is nonsense. So I checked their original paper. In that paper,
they substitute H+ with N(CH3)4+, and do SANS experiments at different H2O/D2O
ratio. After that, they normlized all the SANS profile with 100% H2O, so t |
|
t*********t
发帖数: 363 | 25 Recommend one paper
Wang P, Koberstein JT
Morphology of immiscible polymer blend thin films prepared by spin-coating
MACROMOLECULES 37 (15): 5671-5681 JUL 27 2004
是
的
同 |
|
c*s
发帖数: 2145 | 26 let me try to explain
it is well known that teh polymer blend or block polymerwill phase seperation
when dried. depending on the ratio, they may have different morphology.
but, the phase seperation should occur at teh length scale of tens or hundred
nanometers, for example, for 100k molecular weight, the size should be ~100nm.
In your case, it is much much larger than that.
therefore, the reason is probably that you have not mixed the two materials
thoroughly. and the materials simply formed dif |
|
c*****e
发帖数: 238 | 27 The length scale of phase separation is mostly governed by the annealing time
and preparing condition. So in principle there is no upper bound as to the
size of the phases.
It is definitely possible that the two materials are not mixed good enough,
but if the resulting morphology shows some sort of order, that is very
interesting.
Finally for thin films, interface interaction is very important and will
affect the density distribution in the longitudinal direction, i.e.,
perpendicular to the surf |
|
w********h
发帖数: 12367 | 28 Dr. Ronald K. Eby
Dr. Ronald K. Eby, 77, passed away on Tuesday, June 27, 2006, due to
complications arising from congestive heart failure.
Ronald K. Eby was the Robert C. Musson Professor of Polymer Science (
Emeritus) and an Ohio Eminent Scholar (Emeritus) at the University of Akron.
His interests covered the physics of polymeric materials, including the
structure, morphology, and properties of plastics, rubber, advanced fibers,
silks, laminates and composites. His research areas included phys |
|
s****e
发帖数: 2934 | 29 【 以下文字转载自 NanoST 讨论区 】
发信人: maodouzi (毛豆子), 信区: NanoST
标 题: Advanced materials上最近几篇太阳能电池文章
发信站: BBS 未名空间站 (Wed Jun 6 10:33:41 2007), 转信
１.Amphiphilic Diblock Copolymer Compatibilizers and Their Effect on the
Morphology and Performance of Polythiophene:Fullerene Solar Cells**
２. Design Rules for Donors in Bulk-Heterojunction Solar Cells—Towards 10
% Energy-Conversion Efficiency**
By Markus C. Scharber,* David Mühlbacher, Markus Koppe, Patrick Denk,
Christoph Waldauf,
Alan J. Heeger, and Christo |
|
a*i
发帖数: 1652 | 30 yes, depending on specific cases.
NMR, solubility, morphology... |
|
p*********e
发帖数: 42 | 31 follow your boss's procedure. It is widely used by many people.
it is not as easy as you thought.
if you heat it up to fast, and solvent evaporates too fast, this can
introduce bubble/voids to your film.
the morphology of your film (particulary for semicrystalline polymer) also
strongly depends on the thermal history. |
|
d**a
发帖数: 3715 | 32 International Journal of Polymer Analysis and Characterization,
Volume 4, Issue 4 April 1998 , pages 295 - 308
New Segmented Polyurethanes Containing Perfluoropolyether Blocks 1.
Morphological Characterization
please send it to z****[email protected], Thanks |
|
y***e
发帖数: 6082 | 33 说道AFM，俺现在特羡慕Russell的仪器，做polymer morphology真是绝了
good point，多谢了
你用的应该是grafting from的方法吧，如果是silicon wafer，把片子放到polymer和
monomer的良溶剂里面，用超声波超几分钟，吹干了换溶剂继续超，搞个三四次就可以
把物理吸附的去掉了
如果不放心，可以考虑用ellipsometer测膜厚，如果膜厚没变化了，物理吸附的肯定除
掉了
不知道你做surface grafting的时候加不加free initiator，很多group都证明了表面
聚合和溶液聚合得到的polymer差不多一样的，可以预见在表面上也将会共聚，但实验
结果才能说明问题，建议你在做surface grafting的时候在溶液里加free initiator，
如果表征的结果表面上没有惰性单体共聚的发生，将会是一个比较好的结果，但个人觉
得这个可能性不大
表面的表征，你可以用FTIR-ATR，做个homo的表面作为参照；其它还可以考虑用AFM，
如果两个polymer的phase image之类的会不一样的话；还可以 |
|
c*s
发帖数: 2145 | 34 got it. the first block is acrylate species and the second block contains
sulphonate group. two samples with different hydrophilic-hydrophobic lengths
were prepared and they self-assembled in water to form micelles, with
either spherical or fiber morphology. |
|
S*****n
发帖数: 6055 | 35 concentration may affect the morphology |
|
c********x
发帖数: 232 | 36 You can always use small angle scattering to back-analyze the morphology of
micelles! |
|
b**********e
发帖数: 531 | 37 发了很多信给editor们，都是找的Polymer 以下的杂志
很多都是说加到list,让等着，这样还有戏没？谁能推荐一下?
我的背景是block copolymer morphology, TEM XRD Thermal Analysis
现在做polyurethane
多谢 |
|
c********x
发帖数: 232 | 38 pretty much national user facility only. the turnover time with proposal
is pretty long.
if you just want the self assembled structure, transmission can do it
too. of course you have to assume that you really have a 2d, instead
of 3d morphology, which is not a given. |
|
b**********e
发帖数: 531 | 39 伸绿卡急用，哪位好心人帮帮忙
Cao, W.; Sun, L.; Rong, L.; Hsiao, B.S.; Zhu, L., Chirality effect on
interaction parameters in poly(ethylene-co-1-butene)-b-polylactide diblock
copolymers. PMSE Preprints 2008, 99 378-380.
Zhu, L.; Sun, L.; Miao, J.; Hsiao, B. S.; Avila-Orta, C. A.; Sics, I.
Structure and morphology of crystalline polymer/clay nanocomposites.
Proc. NATAS Annu. Conf. Thermal Anal. Appl. 2004, 32nd, 101.10.727/1-
101.10.727/5.
Zhu, L.; Sun, L.; Ge, Q.; Quirk, R. P.; Hsiao, B. S.; Avila-Orta, C |
|
B****W
发帖数: 100 | 40 hey, count me in, if you still need reviewers :), particularly interested in
polymer morphology.
in
characterization |
|
g*****a
发帖数: 340 | 41 另外一篇灌水文章，需要自己推荐reviewer, 开始随便找了几个都不搭理，有愿意帮忙
的么？虽然杂志排名低，但多少也算审稿，申请绿卡什么的应该有用的。。。
1. Title and the central theme of the article.
Paper title: "A MATLAB Program for Quantitative Simulation of Self-assembly
of Polymer Blend Films with Nano-scaled Features". This paper introduced the
introduction to the fundamentals, design principles, and scientific use
cases of a computer program for simulation of self-assembly of polymer blend
films with nano-features.
2. Which subject/theme of the Journal the mate... 阅读全帖 |
|
w********h
发帖数: 12367 | 42 来自主题: Macromolecules版 - Job 3 Job Opportunities at Abbott
Job Title: Senior Analytical Chemist
Site Location: North Chicago, IL
Abbott is seeking a polymer scientist with rheology experience to fill an
entry level position in their physicochemical characterization group
DEPARTMENT FUNCTION/OBJECTIVE:
Support the Abbott Technical Operations Functions and the Abbott Technical
Centers worldwide. Resolve physical characterization issues associated with
commercial and research & development drugs, drug products, excipients and
... 阅读全帖 |
|
b**********e
发帖数: 531 | 43 来自主题: Macromolecules版 - 求 JOURNAL OF POLYMER ENGINEERING Volume: 30 Issue: 5-7 Pages: 429-445
MORPHOLOGICAL CHARACTERISATION AND DYNAMIC RHEOLOGY OF NANO-STRUCTURED
BLENDS OF POLYSTYRENE AND SEBS
Raha, S; Kao, N; Bhattacharya, S
my email is:
i******[email protected]
多谢！ |
|
h****z
发帖数: 1996 | 44 来自主题: Macromolecules版 - 包子求文献 【 以下文字转载自 Chemistry 讨论区 】
发信人: hktkrz (hktk), 信区: Chemistry
标 题: 包子求文献
发信站: BBS 未名空间站 (Sun Dec 18 20:38:14 2011, 美东)
http://dx.doi.org/10.5254/1.3535144
Analysis of Morphology Formation in Elastomer Blends
Rubber Chem. Technol. 50, 292 (1977); doi:10.5254/1.3535144 (9 pages)
N. Tokita
Thanks! |
|
D********g
发帖数: 533 | 45 if 2D is fine, you can try AFM scan.
The resolution won't be good, but it depends on your need. If you only need
morphology, it should be fine then. |
|
f****n
发帖数: 95 | 46 请教大家一个问题，
有strongly segregated,amphiphilic block copolymer,完全溶解于某溶剂(polar
solvent, its vapor pressure similar to toluene),做spin-coating制膜，
substrate是hydrophilic silica,总是得到不均匀的表面，应该是dewetting.
现在想得到平整的膜，方便用AFM表征，观察morphology.
一个麻烦的办法是使用neutral surface,就是先在silica上以化学键粘合一层相应的
random copolymer膜，然后再去做block copolymer的coating,有可能有助于避免
dewetting.
请问有什么办法解决？ 欢迎wonderlich老师指教！ |
|
s*****n
发帖数: 741 | 47 I recently coated a PTFE (poly tetra fluoro ethylene) device with some
methacrylat. The coating layer gave round disk like uncontinued morphology
on the device surface, we need get even surface.
I used simple coat method, dip the device into the mehacrylate monomer/
initiator solution, take it out and let the monomer polymerize on the device
surface.
Any suggestions? Thanks in advance, do you think spin coating would help? or
any other coating method? |
|
z******i
发帖数: 38 | 48 fresh Ph.D, 希望能求到一些review paper，我主要方向是polymer nanocomposites,
surface modification using APRP, surface morphology study using x-ray and
neutron reflectivity.具体的情况可以附上CV。希望如果有ID收到review 愿意转让的
联系。感激不尽。谢谢了。 |
|
B*****n
发帖数: 654 | 49 【 以下文字转载自 Texas 讨论区 】
发信人: Boolean (Soso), 信区: Texas
标 题: 能求个 工作推荐不? polymer chemistry 方向的
发信站: BBS 未名空间站 (Wed Oct 8 18:56:16 2014, 美东)
人在TAMU, 找工作中, 有人能帮帮忙么?
10+ years polymer research scientist/engineer with strong experience in
advanced polymer material synthesis and characterization. Expertise in
polymer coating, extrusion, casting films Rheology analysis of polymeric
systems, polymer additives R&D experience, polymer composites preparation
and nano-material synthesis & characterization. A... 阅读全帖 |
|
|
