22CHM115_spring_09

22CHM115_spring_09 - CHM 115 Lecture 21 Reading: Section...

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1 CHM 115 Lecture 21 Reading: Section 11.5, pp. 512-520
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2 Artificial Rubber In 1935, German chemists synthesized a rubber, known as GR-S (Government Rubber Styrene), a copolymer of butadiene and styrene. This became the basis for US synthetic manufacture. By 1944 a total of 50 factories were manufacturing it. Produced twice the world's natural rubber production before the beginning of the war. Now called SBR, this polymer remains the primary synthetic rubber for the manufacture of tires. QuickTimeᆰ and a TIFF (Uncompressed) decompressor are needed to see this picture.
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3 ABS rubber, a more advanced tire compound, better wet traction, polar C-N bonds improve internal adhesion.
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4 Polymer Structure Linear Branched Cross linked
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5 Polymer Structure Linear: The chains are all tangled up in each other. Makes many polymers strong in materials like plastics, paint, elastomers, and composites. High-density linear polyethylene medical devices Tangled linear polymer chain
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6 Polymer Structure Low-density branched polyethylene bag Branched: Branched carbon chains cannot line up as close to each other as unbranched chains can. less contact between atoms of different chains = weaker
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22CHM115_spring_09 - CHM 115 Lecture 21 Reading: Section...

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