d****i
发帖数: 360 | 1 X.Z. Shu, Y. Liu, Y. Luo, M.C. Roberts and G.D. Prestwich, Disulfide
crosslinked hyaluronan hydrogels. Biomacromolecules 3 (2002), pp. 1304–1311.
thanks! |
|
v****l
发帖数: 10 | 2 Order PDMS from Aldrich or some other chemical companies.
You will get two components: PDMS and curing agent(crosslinker) both apears
as liquid. Mix them by 10:1 ratio, vacuum degas until no air bubble come out
, put the mixture into a 60C oven for 2 hours. It is done. |
|
d*******7
发帖数: 188 | 3 不知道发在这里合适不合适，但是还是希望有牛人来解答一下，我没有这方面的背景。
问题： 要测一种材料对液体的 permeability， 但是这种材料不是弹性的，而且很薄
，crosslink
之后比较脆，如何能够用试验方法测呢？ diffusion cell 好像对那些有弹性的薄膜有
用，但是我这
个一加紧会破坏材料本身.
还有一个问题是，这个材料本身是粘合剂 adhesion promoter, 很难把这层从基片上取
下来
有没有人做过类似材料的测试？望不吝赐教， 谢谢 |
|
t*******n
发帖数: 66 | 4 Job Description
We are seeking a recent graduate student or a postdoc to synthesize well-
defined hydrogels with different crosslinking chemisty and study their
structure-property relationship to be used for the enhanced oil recovery (
EOR) of mature oil fields. Moreover, this project will involve a lot of
communication and hands-on training with other group members working on
hydrogel analysis tests such as filtration test and core-flooding tests etc
for EOR. Hydrogel based polymer flooding for |
|
d********O
发帖数: 1196 | 5 Title: Novel superabsorbent cellulose-based hydrogels crosslinked with
citric acid
Year: 2008
Volume 110 Issue 4, Pages 2453 - 2460
DOI: 10.1002/app.28660
Please send to D********[email protected] , if this is more convenient for you.
Thanks a lot! |
|
s*****g
发帖数: 2666 | 6 看着是容易的反应，不过系统确实很复杂，很容易crosslink，
你如果用的是公司的量子点，网站上应该有教你一些步骤，但是不能保证100%有效 |
|
t*******n
发帖数: 66 | 7 Job Description
We are seeking a recent graduate student or a postdoc to synthesize well-
defined hydrogels with different crosslinking chemisty and study their
structure-property relationship to be used for the enhanced oil recovery (
EOR) of mature oil fields. Moreover, this project will involve a lot of
communication and hands-on training with other group members working on
hydrogel analysis tests such as filtration test and core-flooding tests etc
for EOR. Hydrogel based polymer flooding for |
|
c******x
发帖数: 438 | 8 1. Synthesis and Crosslinking of Polyethers with Ethynylphenyl Pendant
Groups
G. Ribera, M. Galià, V. Cádiz
Macromolecular Chemistry and Physics
Volume 202, Issue 17, pages 3363–3370, November 2001
Thx in advance |
|
c******x
发帖数: 438 | 9 Thermal crosslinking of acetylene-containing polymers obtained by radical
polymerization of aromatic enynes
Bungo Ochiaia, Ikuyoshi Tomitaa, , and Takeshi Endob, 1
Polymer
Volume 42, Issue 21, October 2001, Pages 8581-8586
Thx in advance |
|
m*****e
发帖数: 1506 | 10 Synthesis and properties of waterborne self-crosslinkable sulfo-urethane
silanol dispersions
Journal of Polymer Science Part A: Polymer Chemistry
Volume 40, Issue 17, pages 3037–3045, 1 September 2002
please send to j*[email protected]. Thanks a lot |
|
|
W*****s
发帖数: 684 | 12 Klinger, D.; E.M. Aschenbrenner; C.K. Weiss K. Landfester, Enzymatically
degradable nanogels by inverse miniemulsion copolymerization of acrylamide
with dextran methacrylates as crosslinkers. Polymer Chemistry, 2012. 3(1): p
. 204-216. |
|
f*******e
发帖数: 628 | 13 看看那种卖 crosslinker 的公司，比如 Pierce 之类。
的大分子。在哪里可以买到？谢谢~ |
|
r****o
发帖数: 104 | 14 A post-doc position in Petroleum Engineering program of Missouri University
of Science and Technology is available.
The position is open for a candidate who has strong background in polymer or
super absorbent polymer synthesis and evalulation. Our plan is to
synthesize two kinds of crosslinked polymers: the first type can be degraded
into high viscous polymer under reservoir temperature at a designed period
of time (e.g. 6 month at 45 C); and the second type can self-recrosslinked
together to fo... 阅读全帖 |
|
a*****i
发帖数: 2108 | 15 南方科技大学化学系“青年千人”课题组年薪30万诚聘有机合成方向博士后研究人员
主要岗位职责：
从事有复杂天然产物全合成研究或者相应有机合成方法学的研究。
岗位待遇：
毕业于北大、清华、港大、港科大、港中大博士、上海有机化学研究所等或国外著名院
校的优秀博士将能够申请南科大设立的校长卓越博士后计划：年薪为30万元整，其中市
财政生活补贴12万元/年（免税）；
校长卓越博士后申请者应具备以下基本条件：
1、所从事的研究工作应具有先进性和创新性，在相关专业领域已取得突出的学术成绩
和科研成果。
2、应具有良好的思想品质和道德修养，遵纪守法，严格遵守各项规章制度，学风严谨
，工作勤奋。
3、应为世界大学综合排名前200位（以当年度英国《泰晤士报高等教育副刊》世界大学
排行榜为标准）或世界大学专业排名前50位的博士毕业生。
未能入选校长卓越博士后计划的博士后年薪最低为22万元起，最高同样可达30万元（具
体待遇视个人资历和能力面议），其中含有深圳市12万元整的高额免税补贴 （免税）
；组内经费充裕、科研气氛极好、设备先进齐全，并提供良好的办公、住宿和科研条件。
另外，我们也正在招收有志于天然产物... 阅读全帖 |
|
z***x
发帖数: 9 | 16 来自主题: Macromolecules版 - Talk-2 A Thermally Re-mendable cross-linked Polymeric Material
Fred Wudl, UCLA,
Science, 1698, Vol 295, 2002
利用Retro-DA reaction 实现crosslinked polymeric material的自我修补。
This process is fully reversible and can be used to self-restore a fractured
part of the polymer multiple times under mild condition
非常有意思的idea. |
|
w********h
发帖数: 12367 | 17 可以用流变学的方法进行表征。
交联聚合物无法在高温（低频）处出现一般聚合物具有的flow region.
生
been |
|
w********h
发帖数: 12367 | 18 Personally I think this article was written using some not-so-accurate
terms, for example, Flory's theory. But I am not ready to doubt the
information in this article.
As to your questions,
(1) They have been attempted to do so for 40 years, meaning they tried
other methods without using C60.
(2) Not polymerized C60 is harder than diamond, but the three-dimensional
polymer (crosslink-like, I think) containing C60.
于
that
hehe.
yet)
出
的
超
合
物
三
代
了
，
基
大
程
的
实 |
|
t***m
发帖数: 114 | 19 sorry
昨天太匆忙了没回，sorry ah
I actually want to obtain some special tempelates
with surface slightly modified.
for example, we crosslink the sphere more tightly.
thus we stand great chance to obtain paritles with size
of only several nanometers
still not test this, expected 200 or higher
heihei, I am not in states,
what kind of particle you want |
|
m*******r
发帖数: 66 | 20 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!! |
|
m*******r
发帖数: 66 | 21 ggjjddmm, who can help me???
WWWuuu... |
|
t***m
发帖数: 114 | 22 查一下聚酰亚胺的改性吧，应该很多
一般如果可以引入双键或者环氧键，可以在紫外条件下交联
交联后的产物性质和交联度有关
分子内交联大致不会影响溶解性
分子间交联很小的时候仍然具有一定的溶解性
交联度上升，可能就不溶了 |
|
a***n
发帖数: 578 | 23 it can be called as swallon instead of soluable. |
|
m*******r
发帖数: 66 | 24
sounds good.
大侠可否推荐文献一二。我对高分子一点都不熟。
我在这里多谢啦！！
可恶的超星，现在只能看到17页。手边没有其他的高分子书。 |
|
b*****h
发帖数: 29 | 25 I want to fill the monomer solution inside some 100-200 nm hoses, then
crosslink it. So I can get some fibres.
F rubber is hard to synthesis?
also concened with composites, is that easy to fill magnetic particles inside
the hoses?
there are sitll some questions about the despertion of these particles in
monomers.
I need fabricate some magnetic fibres to simulate human cilia.
any briliant idea? |
|
c*******n
发帖数: 1648 | 26 If I want to get greatest toughness out of a natural rubber,
what will be the optimum crosslink density? Where can I find
a good molecular theory for this problem? |
|
b*****h
发帖数: 29 | 27 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? |
|
b**s
发帖数: 589 | 28 Try polyurethane, it can be 绍氏 〉85
prepolymer + MOCA
transfer |
|
b**s
发帖数: 589 | 29 You can buy it from walmart, in the coating category
brittle. |
|
c*******n
发帖数: 1648 | 30 I am not familar with your project, But I know that sol-gel system will shrink
a lot after curing, and it will create a lot of internal stress that induce
cracks you've seen. How to balance internal stress is the problem in your
system.
transfer |
|
c*******n
发帖数: 1648 | 31 Hehe, I bet bunnyjh will have hard time for mold release by using
coating grade PU:)
cited. |
|
c*******n
发帖数: 1648 | 32 First can you teach us why PDMS was the most used material for
microimprinting?
What's the criteria for this kind of process? Then we may come up with some
idea together by knowing this criteria for your process.
transfer |
|
w********h
发帖数: 12367 | 33 check Whitesides' papers.
PDMS is his model polymer.
brittle. |
|
c*******n
发帖数: 1648 | 34 Hehe, because it's not my project, and I am too lazy to read other papers. I
come here because I want to learn from you guys:) Furthermore reading paper
alone can not be compared to the brainstorm here, haha.
some
cited. |
|
b*****h
发帖数: 29 | 35 confused about where to buy polyoxymethylene POM
it seems there is linear and crosslinked two kinds
if just for inject molding with reletively low T, which one I should use?
the most important, where to buy?
I though somewhere cited to selfmake one, but how?
I need to catch up some basic polymer chemistry ...... |
|
c****n
发帖数: 134 | 36 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 |
|
b**s
发帖数: 589 | 37 1。try to break physical association by shear or increasing temp.
2. XPS or other spectrum
blah)
membrane
can |
|
c***r
发帖数: 4631 | 38 Why not light scattering? different T and solvent.
blah)
membrane
can |
|
c*******n
发帖数: 1648 | 39 It might be ok when temperature is lower than glass transition. Or maybe
they've crosslinked it, hehe.
鲨
瓦
对
五
但是091型汉级攻击核潜艇和092夏级导弹核潜艇初期的潜航噪音，竟然高达160
挖
开
国
以
着
力 |
|
b*o
发帖数: 47 | 40 For No.3 only, a Bingham paste/suspension formulation might work - if it
works, then a latent slow crosslinking reaction in air might make it stable in
cell culture, or using specialized cell culture (i.e., alginate gel particles
stable in Ca2+ solutions). It is so interesting that I could not ressist to
make my guess. Let's see if we can make Boss out of work - :)
are
layer
3D |
|
d*****w
发帖数: 124 | 41 I don't think so.
without chemical crosslinks is the key point. Otherwise, what is NOT
thermoelastor from your defination?
room |
|
c*********e
发帖数: 119 | 42 I assume that you are talking about TPE of block polymer.
There are two phases in TPE---rubber and plastics. The phase of plastics act
as the crosslinking points.
The only possibility for your case is: Tg of the rubber phase in TPE is 150C.
Tg of the plastics phase in TPE is much higher than 150C. When T>150C, this
material is a TPE (rubbery); When T<150C, this material is in glass state. |
|
w********h
发帖数: 12367 | 43
conventional
不以为然。
即便crosslinked/assembled peptide胜过polymer,
对我们来说也毫无意义。
我们的基准点就在polymer，
那些工作还是由别人做比较合适。 |
|
D***e
发帖数: 435 | 44 多谢
再问一下，把polybutadiene给crosslink起来，
怎么决定initiator(比如K2S2O8)的用量啊？ |
|
|
C***S
发帖数: 175 | 46 a weak cross linked polymer, if the polymer is hydrophilic, it is hydrogel.
Here I mentioned the weak crosslinked polymer, just to differiente them
from the rubber, which as I think is heavily cross-linker.
Weak cross linked polymer mean the system could have the huge capacity
on absorbing solvent, and can endure large shape change. |
|
|
|
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c****n
发帖数: 134 | 50 "it" is a random copolymer I mentioned as an example,
the surface energy may be tuned in a wider range.
it seems to me from the paper that they are the first to use crosslinked
random copolymer to tune the surface energy.
just curious why people didn't do it earlier...
http://www.sciencemag.org/cgi/content/full/308/5719/236?maxtoshow=&HITS=10&hit
s=10&RESULTFORMAT=&author1=craig+hawker&searchid=1113597928104_10041&stored_se
and
and |
|
