Questions tagged [plastics]

For questions relating to the structures, properties, production methods and potential hazards of polymer materials commonly known as plastics

41 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
5
votes
0answers
64 views

What determines 3D printing material compatibility?

3D printing, specifically the type common for consumers FDM or FFF, involves laying down thin (typically 0.1 to 0.2mm) layers of molten plastic. Modern consumer printers can use various filaments: PLA,...
4
votes
0answers
50 views

"Nivea Sun protect & refresh" melted my tub

I stupidly applied spray sunscreen on my children inside our white, acrylic bathtub and the floor ended up with a white, very sticky residue that rubs off on things, but will not wash away with ...
3
votes
0answers
668 views

What does it mean "polyester doesn't breathe"?

Often people say buy a cotton shirt because cotton "breathes" but polyester doesn't. (i.e. it makes you hot sweaty). What is the scientific meaning behind this? How does polyester trap the heat more ...
3
votes
0answers
36 views

Coating applied to plastic (polymer suitable for straws) to repel carbon dioxide to prevent "floating"

We are four students currently finalizing our last exam-project before our bachelor. We confirmed our hypothesis that straws floating to the top of your drink is a "problem" from our survey. Our ...
3
votes
0answers
44 views

Why don't you see rigid PET extrusions?

So, I'm confused about something. Rigid plastic extrusions for outdoor applications, such as twinwall greenhouse panels and the like, are most commonly polycarbonate. They're next most common ...
3
votes
0answers
343 views

What's causing my plastic fork to break?

This has been a real mystery for me at work. For the past three days I've eaten salads for lunch. I used a plastic bowl with a lid and when I was finished with the salad, I didn't rinse out the bowl ...
2
votes
0answers
55 views

Does mercury react with polycarbonate?

Looking around at various material compatibility charts, they seem quite divided on the compatibility of metallic mercury and polycarbonate. Some sources (here, here, or here) indicate that ...
2
votes
0answers
33 views

Permanent ink from urethane, 99% IPA, and pigment?

I’m an artist and I started working with recycled plastic bottles as a material recently. I want to paint the plastic and retain its transparency, but acrylic paint won’t stick without priming and ...
2
votes
0answers
123 views

At what temperature does a polyester release toxic gases?

I've bought a "Shrinky Dinks" printable sheets and now I'm feeling unsure about using it since I've read that heating polyester materials may be very harmful for health, and the final purpose of this ...
2
votes
0answers
356 views

what are the cons of converting plastic to fuel

I have been trying to read how to fix plastic problems, there seems to be 3 outstanding solutions Re-use Recycle Decompose to Fuel Recycling is expensive, requires lots of water and the quality ...
2
votes
0answers
102 views

Which transparent plastic to use for electrolysis of dilute sulphuric acid

I plan to do an experiment which involves the electrolysis of dilute sulfuric acid (1 M or 1 mol/L). I would like to carry it out in a long transparent plastic container (easier to handle and clean). ...
2
votes
0answers
61 views

How do we know if a newly developed chemical compound has any taste or is tasteless?

I was reading this about polystyrene, which says: "Polystyrene is an odorless, tasteless, rigid thermoplastic", and got hung up on "tasteless". I searched Chemistry.SE for "tasteless" and found this ...
2
votes
0answers
2k views

Conversion of a permeability value from barrer to SI unit

I have done a permeability experiment on LDPE in the presence of air. At $\pu{30^\circ C}$, the permeability was found to be 1.846 barrer. Now I am trying to apply this permeability value to a ...
2
votes
0answers
160 views

fatty acid vs polyethylene

Both fatty acid and polyethylene are made (mostly) of carbons with hydrogens with a very similar configuration, yet, their properties are very different. What am I missing?
2
votes
0answers
100 views

How does dissolving LDPE in wax work?

I was looking into machinable wax, and found it's based on dissolving LDPE into melted wax. While I understand the normal salt dissolving in water process, I'm not really sure how plastics can ...
2
votes
0answers
43 views

Do Pigments, Dyes (with plastics) or Plastic Itself Exist that Appear White but are NIR transparent?

I am looking to make a NIR (Near Infrared) window for a project I am working on but need it to appear white rather than the typical Reddish Black NIR window found on most remotes. Does a dye or ...
2
votes
0answers
257 views

Can TBE electrophoresis buffer be stored in a PETE container?

I'm doing a science project on agarose gel electrophoresis and would like to know if it is safe to store Tris/Borate/EDTA buffer solution inside a PETE container since I will be making about 10L of ...
2
votes
1answer
229 views

Suitable coating material for protection of sensors

I'm building a moisture/temperature sensor for outdoor use in soil. It uses capacitive sensing for moisture and an NTC thermistor for the temperature. It's going to be used for vegetables so food ...
2
votes
1answer
10k views

What is the transparent film that covers water-soluble dishwasher tablets?

These dishwasher tablets (Finish Powerball Shine) seem to be covered in plastic! But that can't possibly be true since there's no unwrapping, and they're completely soluble in water. What is the ...
1
vote
0answers
12 views

Using cooling to temporarily lock in deformation in plastics?

I need to shrink PEEK or solid polyimide tube, $\pu{1mm}$ wall thickness and $\pu{15mm}$ OD over another fragile component. Is it possible to stretch the tube over a mandrel, lock in the deformation ...
1
vote
0answers
36 views

Absorption spectrum of common plastic polymers

I am looking for data regarding absorption spectrum of common used plastic polymers, in the range of 200- 1.000 nm Moreover, I am looking for inorganic or organic compounds, which can be mixed ...
1
vote
0answers
51 views

Dissolving CNE (cresol novolac epoxy) resin covered computer chips

I intend to destroy (dissolving would be optimal) a few computer chips (NAND memory chips used eg. on SSDs to be precise). Why? See foot note. I am not a chemist, so of course I tried to research the ...
1
vote
0answers
39 views

Does #4 LDPE Plastic Bottle Leach into Water?

I understand that Water Bottles expire due only to the fact that the plastic can degrade over time and leach into the water making the water's taste not as desirable as the manufacturer might intend. ...
1
vote
0answers
33 views

Dissolving plastic resin without damaging aluminium surface

I have an aluminium surface covered with some plastic, which I intend to dissolve in order to clean the surface. On the note for the plastic I have applied, it says that it contains the following: 2-...
1
vote
0answers
155 views

How to dissolve PLA/PCL/PMMA?

I have a research about electrospun membrane synthesis where I dissolve PLA pellets in chloroform:methanol (3:1) for 3 hours and also PCL pellets in chloroform:methanol (3:1) for 3 hours too. Another ...
1
vote
0answers
86 views

Near melting thermoplastic material accumulates in the sharper corners. What is this phenomenon?

I have a part made of a thermoplastic material. When I heat it up and cool it down, the dimension of the part changes non-uniformly. Somehow the melted material tries to fill the sharper corners. So ...
1
vote
0answers
89 views

Rubbery surfaces degrading over time

I can think of 4 products I have with rubberized plastic surfaces on them that have degraded over time. (IKEA scissors and kitchen knife, Logitech wireless mouse, Rocketfish wireless keyboard.) The ...
1
vote
0answers
77 views

Plastic enclosure - what is that smell?

I have a Raspeberry Pi in a small plastic enclosure. The whole thing smells intensely of some chemical I normally associate with burned electronics. It is quite choking. Any ideas what it might be? ...
1
vote
0answers
189 views

Is Jell-O flavored plastic?

Per this article, "Gelatin is a thermoreversible, cold-setting polymer." Further, Jell-O is flavored gelatin. Is the phrase "thermoreversible, cold-setting polymer" equivalent to the term "plastic?" ...
1
vote
0answers
671 views

Acrylic paint on polypropylene PP

I have bought a set of polypropylene (PP) test tubes that I wish to paint with acrylic to achieve the same effect as the following image: Can anyone recommend a process I can apply to the test tubes (...
1
vote
0answers
188 views

Does the plastic cup PETE 1 material leak toxic material if subject to boiling water even for part of a minute?

Sometimes a cafe may pour boiling tea into a plastic cup made of PETE 1 and then add lemon and cold water / ice to it. When the cup is handed to the customer, the cup looks ok. And I suppose even if ...
1
vote
0answers
207 views

Diffusion into PMMA

My thesis is about effect of cigarette smoke to PMMA polymer, apparently cigarette smoke have some amount of eugenol which is mildly acidic and they will evaporate when the cigarette is burned. In ...
1
vote
0answers
104 views

Resin for making Jewelry

I want to make resin jewelry, but I'm having problems! I want to create that effect, but I do not know what materials to use The result is a mix of resin and other such things
0
votes
0answers
23 views

Natural preservatives of ink

Would pure compounds like thymol, carvacrol and cinnamaldehyde work as preservatives of fountain pen ink? I'm specifically interested in three properties - Prevention of growth (mostly fungal) in the ...
0
votes
0answers
42 views

treating PLA (Polylactic acid) plastic to make it biodegradable

I am using PLA for 3D printing, and I know it does not degrade well in the wild. I would like to know if there is a chemical process I could use to treat it at home. Specifically, I am looking for a ...
0
votes
0answers
25 views

Readily available PVC plasticizer

I'm looking for products that can be used as non-toxic PVC plasticizers. I've used ATBC as a product that I can add to, for example, the inside of a pool toy, which with time absorbs it and becomes ...
0
votes
0answers
31 views

HDPE vs PP for storing pure aldehydes

I know both HDPE and PP have at least some degree of resistance to aldehydes, esters and aliphatic hydrocarbons. I am concerned however about minute contamination over time of pure samples and so I ...
0
votes
0answers
65 views

Maximum lifetime of plastic on earth

[EDITED] If humans disappeared today, and aliens visited in the future, for how long would plastic or other "obviously" non-natural polymers be detectable on the planet, using known or plausible ...
-1
votes
1answer
52 views

Would the mixture of Latex Rubber and the Squid's chitin make a biodegradable plastic?

I don't know much of Chemistry but I put the chemical structures of each. Thank you!
-1
votes
1answer
2k views

HDPE bottle for gasoline?

What are the risks of storing E10 gasoline in a gallon HDPE container for a few months, vs storing in a proper plastic fuel can? Assuming the HDPE gallon is thick (used for Hydrochloric acid before, ...
-2
votes
1answer
64 views

I want to purposefully dry up (polymerize) an entire bottle of ethyl cyanoacrylate (Super Glue). How to do it?

So, I want to do some tests with the solid form of ethyl cyanoacrylate. I have a small 20g bottle which was very cheap so I don't mind. How can I cause the entire contents of the bottle to set and ...