d***a
发帖数: 73 | 1 If interested, please respond to my email inbox. thx
(1) RCG Sr. Packaging Engineer
Description
In this position, you will be responsible for the development and
certification of fluxes (water soluble, no clean, solder pastes) for a
variety of packaging applications. You will also be responsible for leading
efforts to develop, integrate, and certify materials and suppliers in
support of assembly packaging development and High Volume Manufacturing (HVM
) readiness for Intel's CPU and chipset tec |
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h***s
发帖数: 111 | 2 It depends on the CMC of B-b-C. If CMC < 3%, I think it will. But it might
not be able to encapsulate A in the micelles if A is fully soluble in your
solvent.
＝3 |
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w********h
发帖数: 12367 | 3 这个翻译有问题,材料"strong"不是"硬",而是"强".
"硬"的话那是stiff.
U-M research: New plastic is strong as steel, transparent
ANN ARBOR, Mich.—By mimicking a brick-and-mortar molecular structure found
in seashells, University of Michigan researchers created a composite plastic
that's as strong as steel but lighter and transparent.
It's made of layers of clay nanosheets and a water-soluble polymer that
shares chemistry with white glue.
Engineering professor Nicholas Kotov almost dubbed it "plastic steel," but
the new m |
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a*i
发帖数: 1652 | 4 the solubility depends on copolymer composition, I guess?
As long as your polymer dissolves, you should be good. |
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a*i
发帖数: 1652 | 5 yes, depending on specific cases.
NMR, solubility, morphology... |
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i***y
发帖数: 190 | 6 is LiBr necessary for all measured (DMF/DMSO soluble) polymer? |
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r*******e
发帖数: 83 | 7 比较一些系统中药物和聚合物的相容性，需要这些参数。不知哪位能提供些相关的文献
。看到一篇文献中引用书中章节，可惜找不到该书。希望有该书的xdjm分享一下，不胜
感激。
Krevelen DV. 1990. Cohesive properties and solubility. In: Krevelen DV , edi
tor. Properties of polymer: Their correlation with chemical structure; Their
numerical estimation and prediction from additive group contributions, 3rd
ed. New York: Elsevier Scientific Pub. Co., pp 189-224.
Email:j*********[email protected] |
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b**********e
发帖数: 531 | 8 Want to use as filler into polyurethan resin. Looking for commerciallized
products.
Thank you |
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j***n
发帖数: 19 | 9 even if the inorganic material is not soluble in the solvent for PMMA, you
may still be able to make solution cast films as long as the inorganic
materials disperse in the solution homogeneously.
在 myfatwallet (冲动是魔鬼！) 的大作中提到: 】 |
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j***n
发帖数: 19 | 10 high molecular weight PE is hardly soluble in any organic solvents. for low
molecular weight PE, try your luck in hydrocarbons. |
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z********i
发帖数: 5 | 11 我是南开大学的本科生
大一大二在物理院学习，大三时候转到化学，现在已经修完化学院课程
数学学的比较好，获得过天津市数学竞赛（数理组）一等奖
学分绩87左右
有过一些研究经历
A, 2007年5月——2008年7月 研究多种体系的可溶性交联大分子。（实验由老师设计，我和其他两个本科生完成实验，文章由我翻译成英文）
B, 2007年12月——现在 计算化学，从头算方法研究PEO离子液体的热力学动力学性质（这个方向需要补的知识太多，一直在跟师兄学习，刚刚有自己的小课题）
C, 2008年7月——现在 研究硅小球—高分子核壳结构及其催化作用（老师给出方向后，由我独立阅读文献，设计实验计划并进行的实验）
发表或者递交出的文章（其实文章发表的不是很好，一篇ACS会议的我还是4作上火呵呵，还有其他3篇发表的杂志也不好）：
a，Synthesis soluble cross-linked poly(methyl methacrylate -divinylbenzene-natural rubber）by radical and cationic double active center
b，Contr |
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r******0
发帖数: 2753 | 12 What you talked about is not traditional emulsion polymerization. yes, mini-
emulsion polymerization or seeded emulsion polymerization can use oil
soluble initiator. Those are very different mechanisms. |
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b******0
发帖数: 45 | 13 1. purify styrene by basic alumina column
2. conc. is too low. try polymerization without toluene if A can be
dissolved in styrene. Or just add 0.25~0.5ml toluene if the solubility of A
is not poor
3. three days seems too long using AIBN as initiator at 80C |
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l*****o
发帖数: 52 | 14 I think you can add more AIBN to counteract the existence of inhibitor, also
the monomers cocentration is too low. Just curious,why not using TEMED+APS
as the initiator system at room temperature? Is solubility a problem at low
temperature? |
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b******0
发帖数: 45 | 15 transparent completely? Not cloudy or some light blue?
The solution should not be transparent completely, if it is difficult to
pass 0.45um filter. And it should not be due to high molecular weight. At least, PS of 500,000g/mol can pass through the filter smoothly. It is possible that
there are some micelles formed in the THF solution due to the solubility
issue.
By the way, you should not use larger size filter, or else you may clog the
column. Try other GPC, toluene or DMF. |
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m*****e
发帖数: 1506 | 16 try polar solvents like DMF or DMSO
try polymerization at high temperature
it also depends on what kind of monomer and what kind of polymerization. |
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d**a
发帖数: 3715 | 17 Thank you for your reply. The monomer is a multi-ring aromatic compound,
very difficult to dissolve in DMF at 80 oC.
I am currently trying a free radically polymerization process. |
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c*s
发帖数: 2145 | 18 sounds like steric effect plays a role and you might try copolymerize with
other monomer |
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m*****e
发帖数: 1506 | 19 You may want to modifiy your monomer, re-link the vinyl group and pendant
functional group of your monomer using a longer spacer,and also try to redue
the rigidity of your monomer structure. |
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d**a
发帖数: 3715 | 20 en,make sense. Previously this monomer has been successfully copolymerized
with styrene in a molar ratio of 50/50. I will try a living polymerization
to see what will happen. |
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a*****h
发帖数: 13 | 21 maybe you can use benzene
but that is toxic... |
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h*****1
发帖数: 26 | 22 【作者】 Miroslav Chmelir, Alois Künschner, Eduard Barthell
【文题】 Water soluble acrylamide polymers, 2. Aging and viscous flow of
aqueous solutions of polyacrylamide and hydrolyzed polyacrylamide
【期刊名,年份,卷(期),起止页码】Die Angewandte Makromolekulare Chemie，
Volume 89 Issue 1, Pages 145 - 165 |
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k***l
发帖数: 25 | 23 Thanks for your info.
I did try using concentrated HCl, the polymer was soluble, but not
hydrolyzed (dilution the HCl concentration to half and the polymer
precipitated out).
I can't use tert-butyl groups because the methacrylate is actually a fused
to a lactone ring.I am trying to ring-opening the lactone ring by hydrolysis. |
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b*****y
发帖数: 40 | 25 First very sorry about what happened. Hope nothing happened with the safety
of yourself.
The b.p. of EO is only ~ 10 deg C, it is extremely flammable, and it is an
carcenogen, so give it with your highest care possible. That means, no
nights, no weekends, always have labmates nearby, among many other things.
Out of the three reasons, #1 is highly possible. Definitely dilute with much
much more THF. I typically have 40 grams of EO with ~ 800 mL of THF, but at
40 deg C. If you have done a good job... 阅读全帖 |
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b*****y
发帖数: 40 | 26 First very sorry about what happened. Hope nothing happened with the safety
of yourself.
The b.p. of EO is only ~ 10 deg C, it is extremely flammable, and it is an
carcenogen, so give it with your highest care possible. That means, no
nights, no weekends, always have labmates nearby, among many other things.
Out of the three reasons, #1 is highly possible. Definitely dilute with much
much more THF. I typically have 40 grams of EO with ~ 800 mL of THF, but at
40 deg C. If you have done a good job... 阅读全帖 |
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L*********n
发帖数: 24 | 27 各位大侠，
本人想求些审稿机会。方向包括：polymer chemistry, controlled radical
polymerization, RAFT, nanoparticles, surface functionalization, polymer
nanocomposites, water soluble polymers.
之前独立审过一些paper, 有一定经验。如果有机会，请发站内信. 非常谢谢！ |
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k**e
发帖数: 2728 | 28 ☆─────────────────────────────────────☆
mvpzd (Moni) 于 (Fri Oct 30 08:11:18 2009, 美东) 提到:
A 54 year-old male is brought to the ER with a one-week history of headaches
and progressive confusion. He was hospitalized six months ago with viral
esophagitis and two months ago with pneumocystic pneumonis. Lumba puncture
is performed. and shows a moderate increase in CSF protein concentration and
CSF pleocytosis. The latex agglutination test is positive for soluble
polysaccharide antigen. Light mic |
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c********n
发帖数: 4762 | 29 I think it is D.
The organic anion should be glucuronic acid.
A. Nothing to do with haptoglibin, which is secreted by liver and binds to
free hb.
B.C.E. Should be no change or decreased. Only direct bilirubin is water
soluble and can be excreted in urine or feces. |
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d**o
发帖数: 618 | 30 The physician I shadowed recommends "baby aspirin", 81mg per pill sold very
cheap here. As to beta-blocker, he seems to prefer atenolol. HY pharma
mentions that atenolol is water soluble and results in fewer CNS effects.
carvedilol |
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e****0
发帖数: 678 | 31 • Exaggerated deep tendon reflexes can be seen in lock in syndrome.
• Non bleeding varices are managed with nonselective beta-
adrenergic antagonists, such as propranolol.
• Sclerotherapy, endoscopic band ligation, and surgery are
indicated after a patient has a first episode of variceal bleeding.
• TIPS is a last resort in variceal bleeding unresponsive to
medical and endoscopic intervention.
• Ischemic colitis
CT—thickening of eth bowel ... 阅读全帖 |
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D**Z
发帖数: 75 | 32 don't know how old is your son, but next time when you go to your doctor's,
try to ask him/her about the possibility of malrotation, which is normally
diagnosed by upper GI fluoroscopy. barium can worsen the constipation, but
the study can be done with water soluble contrast, which is more expensive
though. good luck |
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s*****y
发帖数: 37 | 33 大小在10nm左右，functionalized, 能够分散到水里的，形成均匀colloid的，大家帮
忙提供点信息。自己做花费太多时间了 |
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a*****s
发帖数: 3643 | 37 我有15nm的Silver，但是保了一层Oleic acid，Silver不太容易氧化。 |
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a*****s
发帖数: 3643 | 38 可以问问Xia younan，他肯定有一堆堆的水溶性的 |
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y***e
发帖数: 6082 | 39 兄弟，好久不见了
大小在10nm左右，functionalized, 能够分散到水里的，形成均匀colloid的，大家帮
忙提供点信息。自己做花费太多时间了 |
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s*****y
发帖数: 37 | 40 是啊，忙什么哪？你也不帮忙提供点信息啊，真不够哥们 |
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y***e
发帖数: 6082 | 42 AuNP你都不会弄？
买了Au Complex，找点NaBH4还原不就得了
是啊，忙什么哪？你也不帮忙提供点信息啊，真不够哥们 |
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y***e
发帖数: 6082 | 43 别晕了，人家可能给你么
你不是搞了很久化学了么，怎么这还没学会？
谢谢诸位大家的帮忙了。我去瞧瞧去 |
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s*****y
发帖数: 37 | 44 会阿，太麻烦了，嗬嗬，需要大概10克，自己合成需要很多时间 |
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y***e
发帖数: 6082 | 45 很多时间？这东西还原还不就几分钟都不要
会阿，太麻烦了，嗬嗬，需要大概10克，自己合成需要很多时间 |
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l******u
发帖数: 2314 | 47 ACS Nano:
Supramolecular Chemistry on Water-Soluble Carbon Nanotubes for Drug Loading
and Delivery
Zhuang Liu, Xiaoming Sun, Nozomi Nakayama-Ratchford, and Hongjie Dai
August 2007 Vol. 1, Iss. 1
Web Release Date: 14-Aug-2007 pp. 50-56 DOI: 10.1021/nn700040t
Read: Abstract Full Text HTML Full Text PDF (1,225k) Supporting Info
【简评】
虽然这是我看的唯一一篇ACS Nano这个新杂志的文章(Kamat的文章只是读了xiaoyi2007
的解读)，我不得不说，Dai博士给这个杂志做出了吓人的榜样。编辑们大概会很高兴，
因为这样一来没有两把刷子和足够工作量的文章是不会乱投过来的。
文章讲述用水溶性(已经PEGylated)的碳管表面非共价地沾上DOX - 一种著名的抗癌 |
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w********g
发帖数: 186 | 48 试试看SC?2% 冰浴超声,时间和功率更长一些?
记得前几天老板提到某篇paper作者claim用基于celcllose(?)的某种聚合物的所谓的对
管子的solubility是SDS的20倍...不知道是怎么定义和计算的 |
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p******6
发帖数: 169 | 49 我要的是water soluble...溶剂必须是水。。。 |
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J*****a
发帖数: 171 | 50 "The reason for the aggressiveness of chloride has been pondered for some time, and a number of notions have been put forth. Chloride is an anion of a strong acid, and many metal cations exhibit considerable solubility in chloride solutions. Chloride is a relatively small anion with a high diffusivity, it interferes with passivation, and it is ubiquitous as a contaminant."
From "Pitting Corrosion of Metals-A review of the critical factors" by G.S. Frankel.
I think you can find some similar argum |
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