c*******n 发帖数: 10 | 1
TGA-MS is almost standard facility in many labs now, you can get definite
information easily. |
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r******0 发帖数: 2753 | 3 Who told you that? Maybe s/he was talking about DMA or TMA?
of |
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S*****n 发帖数: 6055 | 4 well, even if this method works, your Tg has to be in the range between RT
and boiling point of your solvent......
is
solvent
be |
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S*****n 发帖数: 6055 | 5 small molecules can change Tg? they even don't have Tg ah...... |
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p******e 发帖数: 164 | 6 ft...they don't have Tg, they can drop Tg.
you forget plasticization effect? |
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m****u 发帖数: 434 | 7 I’m leaving the company so that they want someone to take my place.
Polymer Chemist (contractor)
Job Description for Master Level Polymer Scientist:
Primary responsibilities is in polymer syntheses and developing analytical
techniques and interpret data using equipment such as NMR, GPC, TGA, DSC,
DMA, INSTRON, Rheology, FTIR and so on. Hands-on experience and trouble-
shouting capabilities in DSC, DMA, and INSTRON are required.
Data analysis, statistics, design of experiments.
Demonstrated abili |
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x***n 发帖数: 55 | 8 来自主题: Macromolecules版 - TGA 坩锅里掉了什么杂质了吧?曲线上有突变点么? |
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w********h 发帖数: 12367 | 9 那天我在化学版贴了个韩国人的文章,
4年被引用54次,不少吧,
刚刚看到polycaprolactone的热降解温度能有>550度 (TGA, 20 oC/min, N2)。。。 |
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t****e 发帖数: 329 | 11 粒径单分散和热降解有什么直接关联啊
两者原本就没关系 |
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i********t 发帖数: 1148 | 12 请问有什么好的书或者文献介绍polymer的单体结构或者说side chain对decomposition
temt.的影响吗?谢谢啦。 |
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a*i 发帖数: 1652 | 13 从动力学理解可能是对的。。。
POLYISOBUTYLENE没有加稳定剂,加工没有问题的。TGA测到的降解温度好像也很高。 |
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w**********g 发帖数: 687 | 15 That's right.
I have one rheometer from TA and consider to get from them now.
But the Japanese can save about $5000 |
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S*****n 发帖数: 6055 | 16 try to get quotes from more companies, such as Shimadzu or Perkin Elmer |
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o*****d 发帖数: 175 | 17 还有一年就毕业了, 年底拿到化工的博士和机械的硕士。加上已有的,毕业时会有杂
志论文四篇,会议若干。博士期间主要研究Polymer的creep/relaxation, 和aging及其
引发的的机械性能的变化。硕士研究压阻材料以开发新的压力传感器。研究方向离传统
的化工和机械相差都很远,倒是和高分子沾点边, 不过看了本版一些其他的帖子,好
像搞合成的很多,也很偏化学。我用到过TGA和DSC,其他对化学相关的知之甚少。请问
各位大侠,这样的背景好找工作吗,能找什么的工作? |
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f******n 发帖数: 137 | 18 We are looking for a Polymer Material Scientist/Engineer postdoc with
experience in polymer materials development and characterization,
spectroscopy methods (IR, Raman), TGA/DSC, cure viscosity monitoring,
materials and composite performance optimization, resin cure/kinetics, aging
of materials, aging models and lifetime prediction.
Polymer Material Scientist Postdoctoral Appointment Sandia Corporation
Albuquerque, NM
You can view and apply for this job at: http://www.sandia.gov/careers/search-o... 阅读全帖 |
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i****o 发帖数: 242 | 19 【 以下文字转载自 Chemistry 讨论区 】
发信人: iamleo (Northwestern Wolf), 信区: Chemistry
标 题: 真心诚意 求 审稿 机会!
发信站: BBS 未名空间站 (Tue Jan 29 12:50:13 2013, 美东)
各位bbs的大牛小牛们,小弟想求一些审稿机会,
熟悉的领域有:
高分子合成(polymer synthesis)
纳米复合材料(nanocomposites)
天然高分子 (cellulose, chitin, etc.)
生物能源 (biomass technology)
绿色化学 <合成&分析>(green chemistry)
分析化学 (Thermal analysis like TGA, DSC, DMA;Spectroscopy like NMR, FTIR,
Raman, etc)
最近有过三次审稿经历,主编评价很不错。
为了给自己造福,想继续积累更多的类似经历,
同时也为学术界贡献一丁点绵薄之力。
请各位站内联系,小弟会及时发送自己简历以供参考。 |
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b****n 发帖数: 379 | 20 【 以下文字转载自 Chemistry 讨论区 】
发信人: bigben (本哥), 信区: Chemistry
标 题: Melting peak lost? 求教
发信站: BBS 未名空间站 (Mon Jul 8 16:57:10 2013, 美东)
是一个有机分子,做TGA,循环多次。第一次升温到熔点的时候很正常的有吸热峰,然
后冷却下来的时候有放热峰,正常。奇怪的是,再循环一次的时候,升温到熔点时吸热
峰没了,降温也没有放热峰;提高最高点的温度也没用;多循环几次也没用。最后的样
品变成了film一样的东西(一开始是粉末)。很confuse.大牛给解释解释。最好有些什
么应用。 |
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b****n 发帖数: 379 | 21 是TGA-DSC同时作的。
我自己纠正一下,一开始升温的最高温度在吸热峰出来了2/3的时候就开始冷却了,所
以熔化并没有完全。冷却时放热峰的峰值位置比吸热峰值低了15C。第二次升温时,最
高温度提高了10C,所以cover了整个吸热峰,再冷却的时候就没有放热峰了。 |
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i****o 发帖数: 242 | 22 【 以下文字转载自 Chemistry 讨论区 】
发信人: iamleo (Northwestern Wolf), 信区: Chemistry
标 题: 高分子&分析化学 求审稿,
发信站: BBS 未名空间站 (Mon Mar 31 21:07:11 2014, 美东)
各位bbs的大牛小牛们,多谢你们,过去两年我审了25篇文章,主编评价很不错,杂志
影响因子在2.0-6.0之间。律师要我再增加一点自己审稿数量,请求各位再次出手相助。
本人熟悉的领域有:
高分子合成(polymer synthesis)
纳米复合材料(nanocomposites)
天然高分子 (cellulose, chitin, etc.)
生物能源 (biomass technology)
绿色化学 <合成&分析>(green chemistry)
分析化学 (Thermal analysis like TGA, DSC, DMA;Spectroscopy like NMR, FTIR,
Raman, etc)
请各位站内联系,小弟会及时发送自己简历以供参考。 |
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b****n 发帖数: 379 | 23 【 以下文字转载自 Chicago 讨论区 】
发信人: bigben (本哥), 信区: Chicago
标 题: 寻提供化学测试服务的公司
发信站: BBS 未名空间站 (Fri Mar 6 13:20:47 2015, 美东)
如题,需要找一个实验室长期提供各种测试服务,主要需要的是LC, GC-MS, SEM/TEM,
TGA/DSC,ICP, XRF, IR, elemental analysis等服务。要求正规实验室,能签NDA。
请站内联系。地点不限,但优先考虑芝加哥周边。 |
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b****n 发帖数: 379 | 24 【 以下文字转载自 Chicago 讨论区 】
发信人: bigben (本哥), 信区: Chicago
标 题: 寻提供化学测试服务的公司
发信站: BBS 未名空间站 (Fri Mar 6 13:20:47 2015, 美东)
如题,需要找一个实验室长期提供各种测试服务,主要需要的是LC, GC-MS, SEM/TEM,
TGA/DSC,ICP, XRF, IR, elemental analysis等服务。要求正规实验室,能签NDA。
请站内联系。地点不限,但优先考虑芝加哥周边。 |
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B*****n 发帖数: 654 | 25 来自主题: Macromolecules版 - 求工作推荐 国内有机合成PhD,美国做博后多年,纳米材料,高分子材料,都有涉及. 发表文章20余篇,
能独立科研. 求工作推荐.
10+ years research scientist/engineer with strong knowledge in polymer
chemistry and organic chemistry. Expertise in synthetic organic chemistry,
polymer work formulation, material science, surface modification and coating
. Extensive experience of scientific presentations at international
conferences. A result oriented team player & independent worker, with skills
summarized as:
Synthesis Skills: Polymer formulation; Polymer hybrid mate... 阅读全帖 |
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发帖数: 1 | 26 本人多年从事polymer chemistry, organometallic, nanomaterials的研究工作,最近
在展审稿数量申绿,求推荐。以下是我的研究领域:
• Strong proficiency in design multi-step organic/organometallic/
inorganic syntheses under the various conditions, design of synthetic
strategy based on goal compound, cultivation of single crystals, synthesis
and characterization of organometallic compounds (Pd, Al, Sc, Y, Ti, Zr, Hf,
Fe, Co, Ni, Cr, Ir, Ru), macromolecules and nanomaterials:
1. Cross-Coupling polymerization: design, synthesis an... 阅读全帖 |
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发帖数: 1 | 27 本人多年从事polymer chemistry, organometallic, nanomaterials的研究工作,最近
在展审稿数量申绿,求推荐。以下是我的研究领域:
• Strong proficiency in design multi-step organic/organometallic/
inorganic syntheses under the various conditions, design of synthetic
strategy based on goal compound, cultivation of single crystals, synthesis
and characterization of organometallic compounds (Pd, Al, Sc, Y, Ti, Zr, Hf,
Fe, Co, Ni, Cr, Ir, Ru), macromolecules and nanomaterials:
1. Cross-Coupling polymerization: design, synthesis an... 阅读全帖 |
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g***y 发帖数: 4784 | 28 组分分析,如TGA
做催化的话
去跑性能,ORR之类 |
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S*****n 发帖数: 6055 | 31 把坩埚拿出来看看,样品体积没有有增加到原来的100倍
不会连这点判断能力都没有吧?
或者lz认为烧过以后的样品可以密度增加100倍? |
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p*****t 发帖数: 3 | 33 肯定是仪器的问题,但为何出错的数据这样大?同步的DSC看着挺正常的,见鬼了。 |
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p******6 发帖数: 169 | 34 不管是TGA烧,还是强酸氧化,都除不掉。
还有什么办法么?
这里有人做往CNT上用covalent的方法连粒子的么? |
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p******6 发帖数: 169 | 36 TGA不能做这么高的。。。
碳管是arc-discharge的方法制的,没有用催化剂。EDX里不含金属 |
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S*****n 发帖数: 6055 | 37 哦。。。我们做TGA, graphite通常在900度多一点被烧掉。。。 |
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a*****s 发帖数: 3643 | 38 BET, UV-Vis, TGA, FTIR,DLS,XPS,EDS(EDX),HRTEM.
AFM? |
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S*****n 发帖数: 6055 | 40 如果impurity都是碳,那TGA结果很好啊,呵呵 |
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A***N 发帖数: 219 | 41 Samples are collected for TGA, and surface detection
CNTs were synthesized on the SS mesh, coated with catalysts.
I made the solution of 100% ethanol, sonicated it, and heated the solution
till dry.
To avoid boil the solution, which may blow away the sample, I just set
the Hot plate at the mildly hot temperature. All my setting leds to the
drying process for three days per run.
Since time is limited for me to send the samples to be detected, I am
wondering if there is any alternatives that can s |
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A***N 发帖数: 219 | 42 1.可以精确到一微克;
2.多壁的;
that makes sense.
原先加热到500C是想烧掉unburned hydrocarbon radicals,因为正好有位教授来做讲座
,说到450C就能把杂质氧化得差不多,我先试了450C,用TEM看了一下,发现没有什么
变化,回来又加到500C,好像变化也不大。
很奇怪
感觉就是不同方式做出的CNT,其特性会差挺多的。比如不同group做出的单壁管,TGA
的起始变化温度就会有50~100 C的差别。现在我就想尽可能把我做的CNT的特征给表达
彻底。 |
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w********g 发帖数: 186 | 43 u got it
不过100C的差别如果号称管径分布一样
八成就是purity和quality的关系了
TGA |
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l******u 发帖数: 2314 | 44 硝酸浓度不同,碳管纯度不同,损失量不同
差不多是这个水平。稀硝酸回流后滴定的羧基碳含量基本上是几个百分点
氮气下过500度应该就差不多了,做个TGA可以看得很清楚
氧化的脏东西、碎片、小管子都在“溶液”里,大的还是沉淀吧 |
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D*****9 发帖数: 154 | 45 Title: Post Doctoral Fellow
in Cincinnati, OH
JOB DESCRIPTION FOR THE POSITION OF POST DOCTORAL FELLOW IN THE AREA OF
CARBON NANOTUBE SYNTHESIS AND APPLICATIONS
This position requires knowledge in the field of characterization and
application of carbon nanotubes (CNT). Special skills and experience are
expected from the candidate in this field. In addition, assembling a new CVD
facility and improvement of the existing one will be part of the long term
assignment related to this position. For cha... 阅读全帖 |
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f***r 发帖数: 344 | 46 XRD, ESEM, HRTEM, AFM,Raman Spectroscopy, TGA and XPS
I think it's not that easy being able to use all these machines? Especially
the HRTEM, it's forbidden for infrequent users at my place.
Am I too weak? |
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y***e 发帖数: 6082 | 47 还好把,感觉很多人都会所有的,尤其是做无机晶体的
XRD, ESEM, HRTEM, AFM,Raman Spectroscopy, TGA and XPS
I think it's not that easy being able to use all these machines? Especially
the HRTEM, it's forbidden for infrequent users at my place.
Am I too weak? |
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R****i 发帖数: 2387 | 48 除了TGA,我其他全都亲手做过。。。
Especially |
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l*******0 发帖数: 215 | 50 【 以下文字转载自 Postdoc 讨论区 】
发信人: limin1980 (limin1980), 信区: Postdoc
标 题: Chemist Postdoc position
发信站: BBS 未名空间站 (Mon Nov 28 20:16:59 2011, 美东)
The Advanced Energy Department at Lawrence Berkeley National Laboratory has
an opportunity for a Chemist Postdoctoral Fellow to prepare, characterize
and optimize electrode materials for rechargeable lithium-ion batteries.
This position supports the research activities in the Electrochemistry Group
in developing the next-generation batteries for use in elec... 阅读全帖 |
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