polymer   1657

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Deakin researchers design maintenance-free bridge for Geelong park | Deakin
carbon/glass fiber hybrid polymer rebar for concrete, as an alternative to basalt fiber rebar wherever steel rebar can't be used
polymer  glass  carbon  fiber  hybrid  rebar  concrete  reinforcement  materials  science  research  technology  basalt  alternative 
14 days ago by asteroza
PWA Starter Kit
Starter templates for building full-featured Progressive Web Apps from web components
pwa  starter  template  programming  webcomponents  web  components  polymer  javascript  library 
24 days ago by vicchow
Fabrication of polymeric lenses using magnetic liquid molds: Applied Physics Letters: Vol 114, No 20
Effectively using a ferromagnetic-style formable liquid to make a custom mold for lens, rather than paying a bundle for a custom lens mold from tool steel.
magnetic  droplet  liquid  mold  plastic  polymer  lens  fabrication  optics  materials  science  manufacturing  research  technology 
5 weeks ago by asteroza
Deakin researchers develop concrete solution for recycled glass | Deakin
some types of colored glass aren't recycled due to the difficulty in cleaning it up to clear again, so being able to use it elsewhere is a plus as an alternative to high grade sand. But this is polymer resin based concrete (substituting cement) so that's a different problem...
polymer  resin  concrete  recycled  glass  powder  aggregate  materials  science  research  technology  construction 
5 weeks ago by asteroza
Identifying Unknown Plastics
"This is a piece of free-burning ABS tubing showing characteristic flame color and smoke. The burn test, as it’s known, correlates a plastic sample’s composition with a set of observable properties including…

whether or not the material will freely burn in air when a gas ignition flame is removed,
the color of the flame,
the smell,
the presence or absence of molten drips, and
the color and properties of any smoke, esp. the reactivity of smoke with wet litmus paper.
Though useful, the burn test should be used with caution of the toxicity of many plastic combustion products, and need not be a first resort when confronted with a sample of unknown polymer.

To risk stating the obvious, the first step in identifying a piece of plastic should be to look for a label. Since 1988, the SPI resin identification coding system (Wikipedia) has been widely adopted by plastics manufacturers to label their products for post-consumer recycling. Though the variety of possible plastic materials is essentially infinite, the familiar SPI recycling codes are a useful basic taxonomy of the polymers one is likely to encounter “in the wild.”

SPI # Abbreviation Name Example Use Density (g/mL)
1 PETE/PET Polyethylene terephthalate Water bottles 1.37-1.45
2 HDPE High-density polyethylene Milk jugs 0.93-0.97
3 PVC Polyvinyl Chloride Pipe 1.3-1.45
4 LDPE Low-density polyethylene Saran wrap 0.91-0.94
5 PP Polypropylene Food containers 0.85-0.94
6 PS Polystyrene Model kits 1.05
9 ABS Acrylonitrile butadiene styrene Lego bricks 1.04
Assuming your sample has no label that would indicate its composition, then, the test which offers the best combination of safety, utility, and convenience is probably density. If your sample is made of a single material, solid through and through, its density can be checked against a set of reference liquids of known densities by simply dropping the sample in a small vial of each liquid: If it floats, it is less dense than the reference, and if it sinks, it is more dense than the reference. Polyethylenes and polypropylenes float in water (density = 1 g/mL), for instance, while most other plastics sink. Among heavier-than-water plastics, ABS and PS will float in glycerin (density = 1.26 g/mL), but PETE and PVC do not.

Other useful tests for discriminating plastics are the Beilstein copper wire test (which indicates the presence of chlorine, e.g. in PVC), susceptibility to acetone (most plastics besides polyethylene and polypropylene will become “tacky” on exposure), and whether the plastic turns white under stress, e.g. when bent (PVC whitens; PET does not)."
plastic  identify  unknown  flame  toxic  test  burn  polymer  label  SPI  PETE  PET  HDPE  PVC  LDPE  PP  PS  ABS 
9 weeks ago by cosmic
Encapsulated liquid sorbents for carbon dioxide capture | Nature Communications
Alternative to liquid CO2 sorbents for carbon capture, packing the liquid into UV hardened micro-silicone shells up contact area and ease of use.
microencapsulation  liquid  carbonate  core  polymer  silicone  shell  capsule  carbon  capture  CO2  CCS  materials  science  research  technology 
12 weeks ago by asteroza
Polymer/pwa-starter-kit: Starter templates for building full-featured Progressive Web Apps from web components.
Starter templates for building full-featured Progressive Web Apps from web components. - Polymer/pwa-starter-kit
pwa  howto  polymer  via:oppara 
12 weeks ago by brysmi

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