a*i
发帖数: 1652 | 1 I use a precision pump to deliver styrene. The outlet is a metal fitting.
After I found that the metal fitting was totally blocked, I replaced it with
a new one. If I don't purge out styrene, the styrene would polymerize in
the metal fitting. I can see sticky/viscous stuff extruded out from the
fitting initially; after that styrene will come out. If I stop the pump and
start it again after a day, the same thing will happen.
The metal is SS 316. |
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oa
发帖数: 187 | 2 The government added styrene and seven other chemicals to its list of
possible human carcinogens in a report delayed for years because of fierce
lobbying from manufacturers. Styrene is found in foam coffee cups, food
containers and building materials. |
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a*i
发帖数: 1652 | 3 just found that styrene was self-polymerized in a SS tube. same styrene in a
PE tube was not polymerized. Stainless steel might have initiate the
polymerization.
anybody with similar experiences? |
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x**********1
发帖数: 28 | 4 最近合成的 styrene acrylic 乳液黏度都在30 cPs 以下，跟BASF 的产品 （300-1500
cPs）相差很多，他们是不是加了增稠剂？ |
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S*****n
发帖数: 6055 | 5 SS has Cr, which is a good catalyst for ethylene polymerization. Not sure
whether it works for styrene or not...
a |
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b******0
发帖数: 45 | 7 Styrene is self-polymerizable without initiator. are they
compared in same conditions? same temperature, same time,... |
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a********c
发帖数: 60 | 8 interesting.
repeat the experiment by soaking your metal fitting in a beaker full of
styrene see if it will polymerize.- it should not.
Then only possibility would be you created a oxygen starving condition
when you pump the St. Additionally, you created high heat.
fitting.
with
in
and |
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z*******o
发帖数: 136 | 9 PEG-OH与萘钾反应后引发styrene oxide的聚合，还加了些crown ether， 之后用HCL终
止反应。过滤掉无机后在石油醚里沉淀copolymer，结果发现石油醚底部形成了淡黄色
胶状产物。
GPC显示分子量比PEG增加了，但是低分子量处有个小峰。分析原因是不是因为胶状产物
里包裹了溶剂和homopolymer在里面？我觉得EO45-SO10应该是白色固体，如何才能把胶
状物变成白色固体呢？
文献报道说黄色可能是行程了O-K+的离子对，用稀盐酸可以洗去，但是我试了还是没洗
掉。
恳请有类似经验的人指导一下 |
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x**********1
发帖数: 28 | 10 最近合成的 styrene acrylic 乳液黏度都在30 cPs 以下，跟BASF 的产品 （300-1500
cPs）相差很多，他们是不是加了增稠剂？ |
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t***m
发帖数: 114 | 11 Polymere Abbreviations
ABA Acrylonitrile butadiene acrylate
ABS Acrylonitrile butadiene styrene
ABS alloys ABS alloys
ACM Acrylic acid ester rubber
ACS Acrylonitrile chlorinated PE styrene
AES Acrylonitrile-ethylene/propylene-styrene rubber
AMMA Acrylonitrile methyl methacrylate
AN Acrylonitrile
AO Antioxidant
APET Amorphous polyethylene terephthlate
APP Atactic polypropylene
ASA Acrylonitrile styrene acrylate
ASA alloys ASA/PC, ASA/AES etc
ATH Aluminum trihydrate
AZ(O) Azodicarbonamide
BDS Buta |
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w******r
发帖数: 43 | 12 We distilled styrene monomer like following.
1. Add CaH2 into styrene monomer,then, use liquid N2 ti frozen it and degass
it under high vacuum.
2. Stir it for 24 hours.
3. Distill it under vacuum at the temperature of 60~80 C, depending on your
vacuum. We used frozen-distilling technique. Pull high vacuum on two fask and
system. Imerse the empty flask into liquid N2. Close the vaccum line and open
the valve of the other flask which has styrene inside. You also need to heat
styrene containing fla |
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d**a
发帖数: 3715 | 13 I recently synthesized a monomer with a styrene as one functional end group
(confirmed by NMR) and try to co-polymerize this monomer with commercially
available styrene
I ran the reaction in this way:
mix my monomer A, styrene, and AIBN in tolunene
A: 0.25 g, 0.48 mmol
styrene: 0.05 g, 0.48 mmol
AIBN 0.0055 g, 0.034 mmol, 3.5 mol% of monomers.
Freeze-thaw degas twice,nitrogen purge, in 50 mL of toluene at 80 degree C,
stirring for three days.
But it came out nothing has happened. I just checked |
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d**a
发帖数: 3715 | 14 Update:
Reaction 1: polymerize styrene
After removing the inhibitor originally in styrene by passing a
chromatographic column, 5 gram of styrene were mixed with 1 mol % of AIBN in
5 mL of anhydrous THF. The reaction solution was then stirred overnight at
80 oC with a gentle nitrogen purge. In the next morning, all the THF was
found to be blew off and the entire styrene was polymerized to form one
piece of rigid clear material, which was then dissolved in hot toluene and
precipitate in cold met |
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x*******a
发帖数: 11067 | 15 关心塑料问题的可以看这里。
基本原则：尽量不要重复使用。特别是用洗洁精洗了以后再用。不要储存油腻或酸碱的
食物。
Know Your 7 Plastic Codes:
No. 1 - PET or PETE (polyethylene terephthalate)
Typical Product Application: Soft drink bottles, medicine containers
Recyclable? Yes. Single use only as studies indicate PET containers leach
DEHP, an endocrine-disrupting phthalate and probable human carcinogen.
No. 2 - HDPE (high density polyethylene)
Typical Product Application: Toys, bottles for milk, water, detergent,
shampoo, motor oil
Recyclable? Yes.
No. ... 阅读全帖 |
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c*s
发帖数: 2145 | 16 A
ABA
acrylonitrile-butadiene acrylate
ABS
acrylonitrile-butadiene styrene terpolymer
ACS
acrylonitrile-chlorinated polyethylene styrene terpolymer
AMA
acrylate maleic anhydride terpolymer
AMMA
acrylonitrile-methyl methacrylate
APO
amorphous polyolefin
ASA
acrylonitrile styrene acrylate
B
BMC
bulk molding compound
BMI
bis maleimide
C
CA
cellulose acetate
CAB
cellu |
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L********0
发帖数: 8 | 17 Journal: Journal of Composite Materials
Title: Effects of graphite flakes and polar modification on thermal and
mechanical properties of styrene-ethylene butylene-styrene block copolymers
有兴趣的朋友们请将你们的：
Name, Affiliation, Degree, Email Address, Research Background, Short CV
发到我的站内邮箱。 我会选取背景最相关的三位朋友推荐给Editor.
虽然不能保证一定会被编辑选上，但希望能尽自己一点微薄之力帮助需要积累审稿经验
的朋友，祝大家好运！ |
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c**********a
发帖数: 6 | 18 Magnetic nano catalyst modified by dendrimer has excellent performance.
Magnetic nano catalyst modified by dendrimer has excellent performance: 1.
better stability 2. better solubility, can be dissolved in many organic
solvents 3. higher catalytic activity 4. higher catalytic selectivity. In a
variety of organic solvents, it can catalyze a variety of substance in the
hydroformylation reaction, such as catalytic styrene, 4 - fluoro-styrene,
bromostyrene, etc., in appropriate conditions, conversio... 阅读全帖 |
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b******0
发帖数: 45 | 20 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**********g
发帖数: 55 | 21 SIBS: Poly(Styrene-b-Isobutylene-b-Styrene) |
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c***s
发帖数: 70028 | 22 27岁的陆盈盈已是教授、博士生导师、“青年千人计划”入选者，并将回到母校浙大全职任教。
澎湃新闻报道 2月11日，千人计划网公示了第十一批“千人计划”青年人才名单，从去年8月申报工作开始至今，经过三层筛选，最终这份名单中的667人通过了评审。
在这批引进的“海归”青年才俊中，共有41名“85后”，而其中最年轻的陆盈盈则更是出生于1988年11月30日，堪称“学霸”。
中央2008年12月决定实施引进海外高层次人才的“千人计划”，该计划围绕国家发展战略目标，用5到10年时间，在国家重点创新项目、重点学科和重点实验室、中央企业和金融机构、以高新技术产业开发区为主的各类园区等，有重点的引进并支持一批海外高层次人才回国（来华）创新创业。
千人计划网称，截至2014年5月底，“千人计划”已分十批引进4180余名海外高层次人才。
5年前，陆盈盈才本科毕业。5年后，年仅27岁的她已是教授、博士生导师、“青年千人计划”入选者，并将回到母校浙大全职任教。
据浙江大学工程联合国家重点实验室网站“客座教授”栏目内陆盈盈简历：2010年6月，毕业于浙江大学化学工程与生物工程学院，获得学士学位，2014年6月获... 阅读全帖 |
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o***s
发帖数: 42149 | 23 27岁的陆盈盈已是教授、博士生导师、“青年千人计划”入选者，并将回到母校浙大全职任教。
2月11日，千人计划网公示了第十一批“千人计划”青年人才名单，从去年8月申报工作开始至今，经过三层筛选，最终这份名单中的667人通过了评审。
在这批引进的“海归”青年才俊中，共有41名“85后”，而其中最年轻的陆盈盈则更是出生于1988年11月30日，堪称“学霸”。
中央2008年12月决定实施引进海外高层次人才的“千人计划”，该计划围绕国家发展战略目标，用5到10年时间，在国家重点创新项目、重点学科和重点实验室、中央企业和金融机构、以高新技术产业开发区为主的各类园区等，有重点的引进并支持一批海外高层次人才回国（来华）创新创业。
千人计划网称，截至2014年5月底，“千人计划”已分十批引进4180余名海外高层次人才。
5年前，陆盈盈才本科毕业。5年后，年仅27岁的她已是教授、博士生导师、“青年千人计划”入选者，并将回到母校浙大全职任教。
据浙江大学工程联合国家重点实验室网站“客座教授”栏目内陆盈盈简历：2010年6月，毕业于浙江大学化学工程与生物工程学院，获得学士学位，2014年6月获得美国康奈尔大... 阅读全帖 |
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g**1
发帖数: 10330 | 24 学霸又来：27岁女生成浙大教授、博导，5年前刚本科毕业
澎湃新闻记者 蒋子文
2015-02-26 07:40 来自 人事风向
27岁的陆盈盈已是教授、博士生导师、“青年千人计划”入选者，并将回到母校浙大全
职任教。
2月11日，千人计划网公示了第十一批“千人计划”青年人才名单，从去年8月
申报工作开始至今，经过三层筛选，最终这份名单中的667人通过了评审。
在这批引进的“海归”青年才俊中，共有41名“85后”，而其中最年轻的陆盈
盈则更是出生于1988年11月30日，堪称“学霸”。
中央2008年12月决定实施引进海外高层次人才的“千人计划”，该计划围绕国
家发展战略目标，用5到10年时间，在国家重点创新项目、重点学科和重点实验室、中
央企业和金融机构、以高新技术产业开发区为主的各类园区等，有重点的引进并支持一
批海外高层次人才回国（来华）创新创业。
千人计划网称，截至2014年5月底，“千人计划”已分十批引进4180余名海外高
层次人才。
5年前，陆盈盈才本科毕业。5年后，年仅27岁的她已是教授、博士生导师、“
... 阅读全帖 |
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j*****o
发帖数: 638 | 25 这位明显是搞炒菜的，一堆东西往锅里一丢，煮一煮，然后拿出来随便测一下，然后就
说是纳米新材料高性能，这些杂志都是超级水杂志，论研究意义不如生物，论理论水平
不如物理，论应用性更是屁都不是。
1. Y. Lu*, Z. Tu*, and L. A. Archer, Stable lithium electrodeposition in
liquid and nanoporous solid electrolytes, Nat. Mater. 13, 961-969, 2014. (*:
authors contributed equally to this work)
2. Y. Lu, S. K. Das, S. S. Moganty, L. A. Archer, Ionic liquid-nanoparticle
hybrid electrolytes and their application in secondary lithium-metal
batteries, Adv. Mater. 24, 4430-4435, 2012. This paper has been high... 阅读全帖 |
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c***r
发帖数: 4631 | 26 现在大家使用的汽车轮胎都是没有内胎的。那么轮胎怎么能够又结实有不漏气呢？这是因
为轮胎使用了多种具有不同性能的橡胶，并且把这些不同的橡胶组合在一起。
轮胎最内层的橡胶是Polyisobutylene，这种橡胶能够阻止空气从轮胎内泄露，这是这种
材料同其他橡胶相比最特殊的性能。
轮胎的侧面使用的是polyisoprene，这种橡胶就是天然橡胶，具有良好的拉伸回复性能。
这样汽车长期停在一个地方不动轮胎也不会变形。
而轮胎最外面一层的tread则是使用styrene 和 butadiene的公聚物做的，来获得良好的
抗磨损性能。
至于这些不同层次的材料是如何组合在一起的，答案是，高温。在轮胎生产的最后一步，
一个巨大的模子通过高温在轮胎的tread上面刻出花纹，同时把不同层次的材料焊接在一
起。 |
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g*******r
发帖数: 33 | 27 LONDON, March 20: Good car must have good air? Yesterday CCTV weekly quality
report columns launch blockbuster reported: in random censorship Beijing
Benz C-Class, E-class cars, the BMW 3 Series cars, 5 cars, as well as the
Audi A6, Q5 damping chip samples detected with No. 70 asphalt, with a strong
carcinogenic effects, belonging to a carcinogen.
All the models for the show for people familiar with the ABB (Audi, BMW,
Mercedes-Benz), the program was broadcast triggered a strong reaction, about
... 阅读全帖 |
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f*******e
发帖数: 3433 | 28 1篇。大部分都是放导师的名。还完全不能证明自己独立研究。我认识一在美国教授，
每年nature子刊都超过5篇
22. Lei Fan, Houlong L. Zhuang, Kaihang Zhang, Valentino R. Cooper, Qi Li,
and Yingying Lu, Chloride-Reinforced Carbon Nanofiber Host as Effective
Polysulfide Traps in Lithium–Sulfur Batteries, Adv. Sci. 2016, 1600175
21. Qi Li, Juner Chen, Lei Fan, Xueqian Kong, Yingying Lu, Progress in
electrolytes for rechargeable Li-based batteries and beyond, Green Energy &
Environment 1 (2016) 18-42
20. Zheng Lianga, Dingchang Lina, Jie Zhaoa, Zhenda L... 阅读全帖 |
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C******e
发帖数: 11790 | 29 Acrylonitrile Butadiene Styrene (ABS) Tubing/pipe 复合材料的塑料管子。 |
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发帖数: 1 | 35 无知真是无谓... 建议补点常识再来
喷foam穿防护是因为isocyanate，不是甲醛。这东西喷完了就反应完了，基本不会残留
，因为会和水反应变成无害的东西
墙里面的foam很多是styrene的，就跟泡沫塑料一个材料，用这个喝水吃饭都可以，放
墙里面有什么问题？可能有甲醛的是urethane foam，反而是高档货，residential一般
用不起，高层建筑这种对空间重量要求高的才会用 |
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B******1
发帖数: 9094 | 36 I only know the numbers found on plastic containers are for recycle purposes
only. Here is a summary:
Code 1: PET or PETE (polyethylene terephthalate).
You’ll most commonly see this in the thin, clear plastic of bottled water (
or bottled cooking oil, peanut butter, soda, etc.). It’s appears safe for
single use, but these bottles should not be reused, refilled, or heated.
This plastic can be recycled once into new secondary products, such as
textiles, parking lot bumpers, or plastic lumber.
Code... 阅读全帖 |
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B******1
发帖数: 9094 | 37 I only know the numbers found on plastic containers are for recycle purposes
only. Here is a summary:
Code 1: PET or PETE (polyethylene terephthalate).
You’ll most commonly see this in the thin, clear plastic of bottled water (
or bottled cooking oil, peanut butter, soda, etc.). It’s appears safe for
single use, but these bottles should not be reused, refilled, or heated.
This plastic can be recycled once into new secondary products, such as
textiles, parking lot bumpers, or plastic lumber.
Code... 阅读全帖 |
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J**2
发帖数: 30 | 38 他的论文还是很牛的，不过回国时间好像有问题。下面连接可以看到他的简历，
http://www.nimte.ac.cn/jgsz/glbm/rlzy/pyrygs/201106/t20110601_3
三、候选人代表性论文（著）：
1. Jian Zhang, Xi Liu, Raoul Blume, Aihua Zhang, Robert Schlögl,
Dang Sheng Su, Surface-modified carbon nanotubes catalyze oxidative
dehydrogenation of n-butane, Science 322 (2008) 73. 影响因子：29.75
2. Jian Zhang, Dang Sheng Su, Raoul Blume, Robert Schlögl, Rui Wang,
Xiangguang Yang, Andreja Gajović, Surface chemistry and catalytic
reactivity of nanodiamond for the... 阅读全帖 |
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ik
发帖数: 167 | 39 This is the abstract:
The authors describe a highly sensitive colorimetric method for the
determination of ascorbic acid. It is based on the finding that nanosheets
of reduced graphene oxide that were functionalized with poly(sodium styrene
sulfonate) (PSS-rGO) possess peroxidase-like activity that catalyzes the
oxidization of the substrate 3,3',5,5'-tetramethylbenzidine (TMB) by H2O2 to
form a blue product that can be quantified by photometry or visually. If
ascorbic acid is present, a fraction... 阅读全帖 |
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m*****n
发帖数: 7450 | 40 百度说
“牛筋底”是形容和牛筋一样结实，但是牛筋底是人工制造的，也叫热塑弹性橡胶底
。又称：苯乙烯-丁二烯-苯乙烯嵌段共聚物
苯乙烯系热塑性弹性体（又称为苯乙烯系嵌段共聚物Styreneic Block Copolymers，
简称SBCs），目前是世界产量最大、与橡胶性能最为相似的一种热塑性弹性体。目前，
SBCs系列品种中主要有4种类型，即：苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）；苯乙
烯-异戊二烯-苯乙烯嵌段共聚物（SIS）；苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物（SEBS
）；苯乙烯-乙烯-丙烯-苯乙烯型嵌段共聚物（SEPS）。SEBS和SEPS分别是SBS和SIS的
加氢共聚物。
SBS苯乙烯类热塑性弹性体是是SBCs中产量最大（占70%以上）、成本最低、应用较广
的一个品种，是以苯乙烯、丁二烯为单体的三嵌段共聚物，兼有塑料和橡胶的特性，被
称为“第三代合成橡胶”。与丁苯橡胶相似，SBS可以和水、弱酸、碱等接触，具有优
良的拉伸强度，表面摩擦系数大，低温性能好，电性能优良，加工性能好等特性，成为
目前消费量最大的热塑性弹性体。
这是啥，版上的化学家说说 |
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a*********p
发帖数: 717 | 42 T400s/T410s/X301/X200s
Display cover: Carbon-fiber reinforced plastic(CFRP)(top), glass-fiber
reinforced plastic(GFRP) (side walls);
Base: Magnesium alloy
T510/W510
Display cover: Glass-fiber reinforced plastic (GFRP)
Base: Carbon-fiber reinforced plastic(CFRP)
X200/X200T
Magnesium alloy
R400/T400/T500/W500
Top: Super-Elastic PolyCarbonate (SEPC);
Bottom: Carbon-Fiber Reinforced Plastic(CFRP)
T410
Top: Acrylonitrile-Butadiene-Styrene (ABS) plastic;
Bottom: Carbon-Fiber Reinforced Plastic(CFRP)
W |
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s**u
发帖数: 1436 | 43 我不觉得没有s的T系列有什么不好的。
自己周围有T400, T500, 去年的MBP, Dell的E4300和E6500
T系列比dell的商用机还是好很多。MBP看着漂亮，但是重量并不轻。
而且我觉得T系列已经不像以前那样以便携为目的了，真要移动办公的，用Ts或者X。
T400: Top: Super-Elastic PolyCarbonate (SEPC); Bottom: Carbon-Fiber
Reinforced Plastic
T410: Top: Acrylonitrile-Butadiene-Styrene (ABS) plastic; Bottom:
Carbon-Fiber Reinforced Plastic
T500: Top: Super-Elastic PolyCarbonate (SEPC); Bottom: Carbon-Fiber
Reinforced Plastic
T510: Top: Glass-fi ber reinforced plastic; Base: Carbon-fiber
reinforced plastic
T510 / W51 |
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e***e
发帖数: 236 | 44 My mother got sick living in a newly renovated apartment. Can some analytic
specialist help me find a way to test the VOC (volatile organic compounds)?
The list of VOCs contains formaldehyde, decane, butoxyethanol, isopentane,
limonene, styrene, xylenes, perchloroethylene, methylene chloride, toluene,
and vinyl chloride.
I am willing to pay some compensation. |
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s*****e
发帖数: 172 | 45 请问：PS-b-MMA 镀膜 annealing的时候，为什么要在真空箱里面？比如170 degree
under vacuum.
如果不是在真空环境下，比如说暴露在高温空气中，对镀膜结果会有何影响？会不会
styrene 或 MMA发生一些化学反应？会是何样的反应？
谢谢！ |
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y********4
发帖数: 33 | 46 【作者】:
Levchik, SV; Wei, ED
【文题】:
New developments in flame retardancy of styrene thermoplastics and foams
【期刊名，年份，卷，起止页码】:
POLYMER INTERNATIONAL Volume: 57 Issue: 3 Pages: 431-448 Published:
2008
【链接】:
【求助者email】:
j********[email protected]
【求助者是否发包子】:
Your help will be greatly appreciated! |
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d*****i
发帖数: 77 | 47 【 以下文字转载自 Macromolecules 讨论区 】
发信人: dejinli (waiting for rocket), 信区: Macromolecules
标 题: 能用RAFT 合成纯block copolymer吗？Macro chain transfer agent 加AIBN和monomer
发信站: BBS 未名空间站 (Tue Jul 12 23:07:51 2011, 美东)
带thio的Macro chain transfer agent （如P4VP-CTA)加AIBN和monomer（如styrene）
能用RAFT合成纯P4VP-co-PS 的block copolymer吗？没做过RAFT。不过从机理来看理论
上应该会有一半是PS 的homopolymer啊！
不知我是否理解有误。请大侠指教！
拜谢！ |
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c******7
发帖数: 109 | 48 除了NMR 核磁分析手段外，还有其他分析方法可以精确测定高分子共聚物的组分，越精
确，越好（～2%的误差），比如下面这种高分子（poly (hydroxylstyrene)-styrene-
tertbutylacryate (PHS-ST-tBA).真心请教，欢迎任何建议，谢谢 |
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l*******i
发帖数: 52 | 50 Did you check the pH. Most emulsions are partially neutralized for stability
. |
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