y****u 发帖数: 50 | 1 polymer sources.
what kind of triblock do you want? |
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b**s 发帖数: 589 | 2 首先要搞清一个概念:你说的是通常意义的multiblock
AAABBBBBAAAAABBBBAAAAAABBBBBBBAAAAAABBBBBBBBBBBBAAAAAAAAA
还是diblock,
AAAAAAAAAAAAAAAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
还是Triblock
AAAAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBBBBBBBBBBBBBAAAAAAAAAAAAAAAAAAAAAAA
一般说嵌段都是指先加一种单体,聚一段时间再加另一种单体的这种diblock
,Triblock的结构
不过看来你指的是第一种情况,这很正常,这要涉及“竞聚率”的概念,如还不明白
,请参考复旦版(高分子化学)
你是要什么结构先?
--------------
如有用,请wonderlich转到chemistry版
-------------- |
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c****n 发帖数: 134 | 3 For synthesis of ABA triblock copolymers,
a guy published three macromolecules...
However, I can write only one for my triblock copolymer...
because I have a very simple method to circumvent his problems...
This is very unfair: for similar results, less work means higher efficiency. |
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h***s 发帖数: 111 | 4 I just made SBS triblock by coupling of S-x and y-B-y. How can I prove that it
is a triblock insted of SB diblock? PB has a PDI of 2. It is hard to tell by
GPC.
Thanks! |
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l****u 发帖数: 3130 | 5 姓 名: 袁 荃 Yuan _ Quan
出生年月:1982年2月
学历: 博士, 教授
专业方向:分析化学
电 话:
Email:y*********[email protected]
教育与研究经历
2000年9月– 2004年7月:武汉大学化学学士学位
2004年9月– 2009年7月:北京大学无机化学博士学位导师:严纯华院士
2009年9月-2011年12月:佛罗里达大学化学系博士后谭蔚泓教授课题组
2011年12月-现在:武汉大学化学学院教授
代表性成果
1.Quan Yuan, Yun-Fei Zhang, Ruo-Wen Wang, Chao-Lin Du, Emir Yasun, Yan Chen,
and Wei-Hong Tan* “Using Silver Nanowire Antennas to Enhance the
Conversion Efficiency of Photoresponsive DNA Nanomotors” Proc. Natl. Acad.
Sci. U. S. A. 2011, 108, 9331.
2.Quan Yuan, Hao-Hong ... 阅读全帖 |
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l****u 发帖数: 3130 | 6 【 以下文字转载自 Military 讨论区 】
发信人: laodou (别拿豆包不当干粮), 信区: Military
标 题: 武汉大学80后美女袁荃教授走红
发信站: BBS 未名空间站 (Wed Feb 29 14:21:37 2012, 美东)
姓 名: 袁 荃 Yuan _ Quan
出生年月:1982年2月
学历: 博士, 教授
专业方向:分析化学
电 话:
Email:y*********[email protected]
教育与研究经历
2000年9月– 2004年7月:武汉大学化学学士学位
2004年9月– 2009年7月:北京大学无机化学博士学位导师:严纯华院士
2009年9月-2011年12月:佛罗里达大学化学系博士后谭蔚泓教授课题组
2011年12月-现在:武汉大学化学学院教授
代表性成果
1.Quan Yuan, Yun-Fei Zhang, Ruo-Wen Wang, Chao-Lin Du, Emir Yasun, Yan Chen,
and Wei-Hong Tan* “Using Silver Nanowire Antennas to Enhance th... 阅读全帖 |
|
d*****0 发帖数: 68029 | 7 【 以下文字转载自 Military 讨论区 】
发信人: laodou (别拿豆包不当干粮), 信区: Military
标 题: 武汉大学80后美女袁荃教授走红
发信站: BBS 未名空间站 (Wed Feb 29 14:21:37 2012, 美东)
姓 名: 袁 荃 Yuan _ Quan
出生年月:1982年2月
学历: 博士, 教授
专业方向:分析化学
电 话:
Email:y*********[email protected]
教育与研究经历
2000年9月– 2004年7月:武汉大学化学学士学位
2004年9月– 2009年7月:北京大学无机化学博士学位导师:严纯华院士
2009年9月-2011年12月:佛罗里达大学化学系博士后谭蔚泓教授课题组
2011年12月-现在:武汉大学化学学院教授
代表性成果
1.Quan Yuan, Yun-Fei Zhang, Ruo-Wen Wang, Chao-Lin Du, Emir Yasun, Yan Chen,
and Wei-Hong Tan* “Using Silver Nanowire Antennas to Enhance th... 阅读全帖 |
|
f*******t 发帖数: 31 | 8 Journal of Colloid and Interface Science
Volume 126, Issue 1, November 1988, Pages 171-180
online:
http://www.sciencedirect.com/science/article/pii/00219797889011
(Light-scattering study on the association behavior of triblock polymers of
ethylene oxide and propylene oxide in aqueous solution
Zukang Zhou1, Benjamin Chu)
Thank you in advance! |
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a*********r 发帖数: 14 | 9 对不起,我还真是给武大化学系留了面子。
莫非你就是其中一件丑事的主角,干嘛一触即发,破口大骂呢?
袁荃做的是还不错,但不意味武大化学系就有多好了。
举例来说,即使袁荃和另外一位新招的楚天特聘教授傅磊相比,也能看出武大化学系在其中有没有猫腻了。
首先补充一点:袁荃的老公叫廖蕾,也是武大物理系新招的楚天特聘教授,可以作为很好的对照体系。
比比三人的publication和经历,就能明显看出水平之比是:
廖蕾>袁荃>傅磊
但从袁荃却没有评上楚天特聘。
廖蕾
http://physics.whu.edu.cn/node/557
1. Y. Z. Long, L. Liao*, X. F. Duan, Z. Y. Fan*, Large-scale Integration of Semiconductor Nanowires for High Performance Flexible Electronics ACS Nano (In press)
2. L. Liao, J. W. Bai, R. Chen, H. L. Zh... 阅读全帖 |
|
a*********r 发帖数: 14 | 10 对不起,我还真是给武大化学系留了面子。
莫非你就是其中一件丑事的主角,干嘛一触即发,破口大骂呢?
袁荃做的是还不错,但不意味武大化学系就有多好了。
举例来说,即使袁荃和另外一位新招的楚天特聘教授傅磊相比,也能看出武大化学系在其中有没有猫腻了。
首先补充一点:袁荃的老公叫廖蕾,也是武大物理系新招的楚天特聘教授,可以作为很好的对照体系。
比比三人的publication和经历,就能明显看出水平之比是:
廖蕾>袁荃>傅磊
但从袁荃却没有评上楚天特聘。
廖蕾
http://physics.whu.edu.cn/node/557
1. Y. Z. Long, L. Liao*, X. F. Duan, Z. Y. Fan*, Large-scale Integration of Semiconductor Nanowires for High Performance Flexible Electronics ACS Nano (In press)
2. L. Liao, J. W. Bai, R. Chen, H. L. Zh... 阅读全帖 |
|
b**s 发帖数: 589 | 11 如果不是diblock or triblock型
C13 NMR 可以很容易看出来 |
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w******z 发帖数: 29 | 12 I am working on the synthesis of triblock copolymer of PLA-PCL-PLA using
Tin(II) as catalyst. just began this summer and meet a lot of problems.
anybody are good at the system? millions of thanks first!!!!!!!!!!!!!!!! |
|
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c*********e 发帖数: 119 | 14 www.dexcopolymers.com
www.kraton.com |
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z**h 发帖数: 224 | 15 PEO-dPPO-PEO, 5000$,1g, is that expensive? |
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d**m 发帖数: 94 | 16 PEO-deuterium-PPO-PEO?? |
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y****u 发帖数: 50 | 17 wow! but you should expect that.
polymer sources is a small company.
if they have very good business, the price can be lower.
otherwise I will start my own company :P |
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z**h 发帖数: 224 | 18 yes, where can i buy cheaper polymers? |
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c****n 发帖数: 134 | 20 There is an amphiphilic triblock copolymer.
The center is hydrophobic, and the end blocks hydrophilic.
The hydrophilicity of the end blocks can be controlled
as the content of the -OH group can be controlled during polymn.
when the block copolymer with high -OH content is dissolved in THF,
it looks clear and homogeneous.
but the solution can't pass through a membrane for GPC sample preparation.
I believe it is because of the physical association of the end blocks...
but a group member said it co |
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h***s 发帖数: 111 | 21 My goal is to make triblock by in situ coupling during blending, not by anioic
polymerization.
that it
by |
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c****n 发帖数: 134 | 22 For a ABA type triblock copolymer,
the compression molding temperature should be higher than the order-disorder
transition temperature (ODT). is it correct?
How to predict the ODT temperature? The ODT temperature should be higher than
the Tg of each block, but by how much?
any advice is very appreciated! |
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c****n 发帖数: 134 | 23 people don't solve all the problems; rather, they leave the real challenge
behind.
1) For ATRP: several papers attempted preparing triblock copolymers as
Thermoplastic elastomers, but without decent properties (I would say results
are lousy).
2) It was claimed in a review "virtually all monomers are polymerized in
living XXXX polymerization". A critical review would add "but only a few are
truly living and in most cases the polydispersity is too large". |
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S*****n 发帖数: 6055 | 24 如果认为TGA的两个平台是由于A-A和B-B解离能不同造成的
那么diblock和triblock的平台应该在相同的温度出现,呵呵 |
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y***e 发帖数: 6082 | 25 没啥意思啊,搞来搞去最多macro,大牛们都喜欢diblock或者triblock然后自组装成千奇
百怪的东西,ibm现在搞得太火了
做block copolymer的那些组,大多数都做阴离子的吧,不过不怎么单独发合成的文章,
呵呵。 |
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l***i 发帖数: 34 | 26 Volume 71, 2006
Jun-Hua Wan, Jia-Chun Feng, Gui-An Wen, Wei Wei,
Qu-Li Fan, Chuan-Ming Wang, Hong-Yu Wang, Rui Zhu,
Xiang-Dong Yuan, Chun-Hui Huang, and Wei Huang.* Effective
Tuning of HOMO and LUMO Energy Levels by p-n Diblock and
Triblock Oligomer Approaches.
Pages 2565-2571. This manuscript was withdrawn from
publication by The Journal of Organic Chemistry (JOC) Editorin-
Chief. The basis for the withdrawal was a violation of the
Ethical Guidelines to Publication of Chemical Research of the
A |
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j*****y 发帖数: 2 | 27 should disslove, i tried with ABA triblock with much higher molecular
weights, how many dichloromethane did you use to dissolve? |
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s*****i 发帖数: 146 | 28 I synthesized PLA-PEG-PLA triblock polymer. But there is a strange peak at 1
.7
5-1.8 next to the peak at 1.56 ppm which is attributed to the CH3 of lactide
u
nits. I wonder whether the strange peak belongs to water? but I checked that
w
ater in CDCl3 is 1.5 ppm, NOT 1.75-1.8 ppm. Is there sb who knows?
3x a lot |
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c*s 发帖数: 2145 | 29
Bates fundamental and insightful
Eisenberg too old
Winnik not in this field
Lodge very nice person very active, block copolymer application in materials
Wooley vrey popular and active shell-crosslink triblock and new
polymerization chem
Armes not like his style, publish like a crazy dog
Lecommandoux self-assembly of bio-macromolecules not very impressive
Guojun Liu one of the best chinese polymer physicist, but very pushy
+ manners ian
每个教授的侧重点不一样,多看看他们的代表作,卡看你自己的兴趣在什么地方, 我
也是新手,但是也见过其中几个,和其中两个 |
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e*********s 发帖数: 1440 | 30 sorry, I didn't make it clear that what I need is a homopolymer. Actually I
will use it as the midblock in an ABA triblock copolymer. I have used PEO in
my previous work. But PEO has an oxygen atom which is related to hydrogen
bonding and PEO has degradation issues at high temperatures.
Any other suggestions? |
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w******t 发帖数: 107 | 31 上次讲到了个多孔硅的引子。这里首先我要大声鸣谢各位给我提出指正和进行热心讨论
的各位同仁。真想不到我的帖子被上千人次浏览。几年前当我刚刚步入多孔材料研究领
域时,正值其低潮阶段。茫然的心情,时时困扰着我。现在发现居然有这么多兄弟姐妹
活跃在这一战线上,确实让鄙人颇感欣慰。“众人捧柴火焰高”嘛!于是乎,就扯了个
(五)。希望我们能够众志成城,同舟共济,继承和发扬前辈们的辉煌业绩,开创我们
的新时代。毕竟,有序介孔材料的研究始于上个世纪末,到今天也就才刚刚15岁。现在
就断定一个十五岁的孩子以后没出息还言之尚早。
-------------------------------
刚才抒了抒心意,现在开始扯正经的了。
其实光对MCM-41的研究,就非常广泛,相关文献浩如烟海。比如说,对孔径控制的研
究。在synthetic gel里加入pore swelling agent,比如说长链的烷烃(对于CTAB类的
含有长链烷烃的surfactant),mesitylene(针对triblock copolymer, P123, F127等
)和poly(propylene glycol)等。沿着这 |
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