PLASTIC by Cristina Rodriguez https://padlet.com/cristyrodc/x8spbkzq7gtexrrt en-us 2022-05-20 02:55:55 UTC 2022-05-20 03:56:32 UTC hello@padlet.com cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192329130 2022-05-20 02:57:03 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192329130 cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192329334 Plastics were first formulated in the nineteenth century but significant advancements did not occur until well into the twentieth. In 1836 Charles Goodyear processed rubber, which is a natural poly - mer type of plastic, by treating it chemically with sulfur. The first plastic made from organic material was made twenty-eight years later by Alexander Parkes. Parkesine, was moldable under heat and hardened when cooled, could be opaque and sculpted. In 1907, Leo Baekeland discovered the first completely man-made synthetic material, it was electrically resistant, chemically stable, heat-resistant, shatter - proof, and impervious to cracking or fading. In 1933, polyethylene was discovered by E. W. Fawcett and R. O. Gibson. Polyethylene was the first plastic in the U.S. to sell over a billion pounds per year, and continues to be the highest selling plastic in the world today.]]> 2022-05-20 02:57:13 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192329334 cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192329604 2022-05-20 02:57:25 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192329604 cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192330067 Chainlike molecular structures that are made by either altering natural products or by transforming petroleum, natural gas, or coal products into an object. ]]> 2022-05-20 02:57:43 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192330067 GENERAL PROPERTIES cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192330953
  • Plastics are lightweight
  • Resilient
  • Generally resistant to corrosion and moisture
  • Can be molded and formed into complex shapes
  • Synthetic plastics are made from distilled crude oil
  • Contain carbon
  • Can reach different levels of transparency and color
  • High coefficient of thermal expansion
  • Easily cut, formed, and bent
  • Fire-resistant or classified as slow burning, can be toxic when burning
  • Low cost
  • Lower thermal and electrical conductivity
  • Resistant to water and decay
  • High level of deformation, expansion, and contraction due to thermal changes
  • Not stiff
  • Can be scratched

    • ]]>     2022-05-20 02:58:23 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192330953     GENERAL APPLICATIONS cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192331245
  • Fixtures
  • Siding
  • Flooring
  • Insulation
  • Doors and windows
  • Railings
  • Lighting and glazing
  • Building and construction
  • Textiles
  • Consumer products
  • Transportation
  • Electrical and electronics
  • Industrial machinery 

    • ]]>     2022-05-20 02:58:37 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192331245     cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192332908 Plastics fall into two general categories: thermoplastic and thermosetting plastics. ]]> 2022-05-20 02:59:52 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192332908 THERMOPLATIC cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192333367 Generally linear molecules and will hold their shape at normal temperatures but can be re-formed or re-molded into new shapes when placed under high temperatures. These plastics are recyclable and regain their original properties after being cooled again.]]> 2022-05-20 03:00:11 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192333367 THERMOSETTING PLASTIC cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192333880 They have a more complex molecular structure, they can only be formed once and cannot be returned to their basic and liquid state if reheated. They remain rigid once they are cured.]]> 2022-05-20 03:00:34 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192333880 INJECTION MOLDING cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192342641 2022-05-20 03:07:18 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192342641 CASTING cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192342963 2022-05-20 03:07:34 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192342963 EXTRUSION cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192343567 2022-05-20 03:08:04 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192343567 BLOW MOLDING cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192344049 2022-05-20 03:08:26 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192344049 CALENDERING cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192344473 2022-05-20 03:08:46 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192344473 cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192353724
  • Plastic pollution has become one of the greatest environmental issues 
  • 40 percent of plastic produced every year have a lifespan of minutes to hours (single-used plastics), yet, they persist on Earth for hundreds of years. 
  • Every year, approximately 8 millions of tons of plastic reach the oceans, where most of plastic resides and transports around the world. 

    • ]]>     2022-05-20 03:16:38 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192353724     POLYVINYL CHLORIDE (PVC) cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192366916
  • Generally called PVC or vinyl
  • Resistant to water and some chemicals
  • Low in cost
  • Resistant to tearing
  • Not resistant to fire, can tolerate up to 100ºC
  • Extremely versatile
  • Low cost
  • Hard wearing
  • Health concerns over production and disposal
  • Poor UV resistance

    • ]]>     2022-05-20 03:26:52 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192366916     POLYCARBONATE (PC) cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192368446
  • Often used s a substitute for glass
  • 35 to 50 percent of light transmission for white sheets, 88 percent for clear sheets
  • Lightweight
  • High impact strength
  • High impact resistance
  • Transparent up to 2 inches of thickness
  • Good dimensional and thermal stability
  • Stain resistant
  • Easy to clean
  • Thermal expansion coefficient
  • Vary form opaque to translucent to transparent
  • Easy to install
  • Vulnerable to alkalis and aromatic hydrocarbon
  • Tolerates to -40 ºC to 138ºC

    • ]]>     2022-05-20 03:28:10 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192368446     VINYL cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192377524
  • 92% transmission of light, very transparent
  • Varying levels of opaqueness
  • Not resistant to scratches
  • Very strong
  • Easy to work manipulate
  • Good resistance to weather, heat and chemicals
  • Combustible
  • Lightweight
  • Moderate resistance to shrinkage and dimensional instability

    • ]]>     2022-05-20 03:36:08 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192377524     ACRYLONITRILE BUTADIENE STYRENE (ABS) cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192395208 2022-05-20 03:52:32 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192395208 POLYPROPYLENE (PP) cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192395531
  • Versatile
  • Easy to work
  • Can withstand repeated bending
  • Tough and resistant
  • Colourfast
  • Poor UV resistance: additives required for external applications 
  • Resists high temperatures
  • Good toughness, chemical resistance 
  • Softening point of 160ºC 
  • Versatile processing
  • Tough
  • Inexpensive
  • Blends well with other materials
  • Accepts filler and reinforcement

    • ]]>     2022-05-20 03:52:51 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192395531     POLYETHYLENE (PE) cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192398800
  • Low cost
  • Not biodegradable
  • Easy to process
  • Versatile
  • Tough
  • Vary from soft, stiff, or waxy surface
  • Low friction
  • Excellent chemical resistance
  • Springy toughness
  • Easy to colour match
  • Vary from strong to breakable
  • Good chemical resistance
  • Low water absorption

    • ]]>     2022-05-20 03:56:00 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192398800     cristyrodc https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192399375
  • Harder and stronger than thermoplastics
  • Highly resistant to heat, mechanical strength and chemicals
  • Cost effective

    • ]]>     2022-05-20 03:56:32 UTC https://padlet.com/cristyrodc/x8spbkzq7gtexrrt/wish/2192399375