All aspects of polymer science

Can anyone tell me what railcar quantities of HDPE suitable for blown
film is going for these days.

Thanks,

robre

I own a small, (so far), plastic welding business. We custom build anything
but seem to build a lot of tanks for aquaculture.

Now and then I get into projects that I need to go and research the
compatibility of a plastic tank, trough, etc. with an intended chemical. So
far it’s a needle in a haystack for me. I must be looking in the wrong
places or searching inefficiently.

Case in point, a local upholstery shop is getting into chemical stripping of
wood furniture. He has a smallish metal tank now, and wants a larger plastic
one built.

I’m hoping there is a simple list out there somewhere that says whether a
plastic can or cannot be used with different chemicals.

We primarily use HDPE in various forms, PP, PVC and to a lesser degree, PC
and ABS and others.

Thanks in advance for any help.

James Tomalonis
Cedar Springs Plastic Welding
Mill Hall, PA

Hi all!

Could anyone give me advice.
 I wonder what material is preferable for bottles intended  to keep samples
 of ultrapure water before analysis.
 The samples are taken from point-of-use and then analysed with ICP-MS and
AAS
 methods for content of metals and cations (Na, K, Ca, B, Al, Fe, Ni, Co,Cr,
 Zn, Cu, Pb,  etc.) in concentations as low as parts of ppb (mkg/liter).
 Time between sampling and analysis is typically not more than 24 hours.
 I would like to know which polymer material is leaching less ions and other
contaminants – PP, PE, PVC,  PVC, PVDF, PET, PTFE, etc.
All your help is appreciated.

 Vladimir Kossov

There’s some problems to dyeing FDY filament ( 450 twist heat setting ) e.g.
50/48  dtex  s.d.?
What’s the better capillary for 50/48 s.d. HOY  6.000 mt/1′? ( If some
people tried it )
What’s delivered polymer cost today ?  1.1 $/kg ? 2 $/kg?
Thanks

Luca

Hi group,

I’m looking for a way to impart a ‘slip’ effect on to the surface of a PET
preform / bottle to reduce preform-on-preform or bottle-on-bottle damage
and increase the number of preforms that can be packed in a box.

I’ve seen polyester waxes that are effective, but these rely on migration  
only at concentrations which also impart a haze. As most bottles are
uncoloured, this is unacceptable. They can also oxidise to produce unwanted
off-tastes.

However, I’ve recently heard of a system that sprays the preform or bottle
with a solvent based solution which drys rapily and leaves the surface of
the preform / bottle with a very slippy surface.

My research hasn’t thrown any light on who might be making such a system,
can anybody help?

Thanks in anticipation,

Mark.

Hi all,

I am trying to coat a Nafion membrane (90 microns thick) with gold
electrodes.I am first modifying the surface using an oxygen plasma
then depositing a silane on nafion with the terminal group as thiol
and then dipping the membrane in colloidal gold solution.The gold
because of its affinity to the thiol will attach to it and form a
coating.

I am using this as an actuator (in an aqueous medium) by applying a
voltage of 1V.After sometime I notice that the gold comes off the
surface.There seems to be a problem with the adhesion of gold on the
nafion.Any suggestions as to how to improve the adhesion of gold to
nafion will be highly appreciated.

Thanks,
Supriya

Hello everyone,
I would like to know what are the institutes where there is a
possibility to do PhD in the above mentioned field. Kindly give me
details about the chances to get financial scholarship as an
international student. I am doing my master’s in material engineering
option polymers and composites.
Kindly suggest me
With regards
Senthil

jong…@myrealbox.com (Jonathan A. Goff) wrote in message <news:1fcb2f45.0211301351.daeb8ea@posting.google.com>…

- — -

> erincss wrote:

> > >Altho I think the world would be ecstatic even just to
> > >have amorphous metal alloys for thick parts.

> > What would some of the properties and benefits of these alloys be?

> Well, you can check out a company currently selling a lower-end bulk
> amorphous alloy.  

> http://www.liquidmetal.com

> Bottom line is that they get really high tensile strength compared to
> other metals, they are corrosion resistant, when heated to the right
> temperature range they are injection moldable, they are hard and wear
> resistant when cooled, and they are very elastic.

> The main drawbacks right now are cost $15/lb, and that they quickly lose all
> their strength at even moderately high temperatures.

> Hope that is useful,

> Jon

Since you mention "liquid metal" (aka. amorphous alloys) in connection
with this nanotube composite discussion thread, it makes me wonder
whether nanotubes and amorphous metal alloys couldn’t provide useful
complementarity to each other if they were both combined into a
composite material.

How about a nanotube-reinforced amorphous metal composite?

Think about it — smooth nanotubes have that problem of slipping thru
whatever matrix they are embedded in, thus mitigating their
reinforcement properties, but perhaps the irregular structure of an
amorphous alloy would provide fewer opportunities for slippage.

Clearly functionalization of nanotubes seems to be the main route
being pursued by researchers right now, for adapting nanotubes to
reinforcement applications.
The property of critical minimum length for adequate Van Der Waals
attractive forces has also been expounded on, in regards to making
nanotubes stick to each other and to a surrounding matrix. But what
has also been mentioned is the need to have nanotubes in non-linear
(eg. helical) conformations while embedded in a matrix, so as to
sterically maximize the interfacial forces.

I wonder then, if contorted and other non-linear nanotube
conformations are desirable from this point of view, then what is the
critical minimum nanotube length required to have adequate contorted
conformations of nanotubes? Do you see what I mean here? Becoz
contorted nanotubes (eg. helical) are less likely
to slip thru a surrounding matrix.

i am doing a polymers assignment at the moment and i am finding it really
hard just to get some general information about polymers. I need just
general info and also info on the different types of polymers.

i would be very greatful if anyone would be able to provide me with any
information that i need.

thanks
       jess