HUEC 2040-CH. 10 OUTLINE

HUEC 2040-CH. 10 OUTLINE - CHAPTER 10OLEFIN FIBERS Often...

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CHAPTER 10-OLEFIN FIBERS - Often called  polyolefins ; FTC specifies generic name  olefin - “manufactured fiber in which fiber forming substance is any long chain synthetic polymer composed of at  least 85% weight of ethylene, propylene, or other olefin units, except amorphous polyolefins qualifying  under category (1) of paragraph (j) of rule 7” - Polyolefin plastics in many forms most widely used in products such as supermkt bags, yogurt pots,  detergent bottles, and various olefin plastics may be familiar as #2, #4, & #5 recycle symbols - 2 major categories: o Polypropylene o Polyethylene - Worldwide production increase—4 th  among synthetics to 2 nd  (behind polyester)—almost 6 million metric  tons produced in ‘02 POLYPROPYLENE - Manufacture o Propylene—starting material—produced during refining of petroleum gas; therefore production of  polymer has been purview of chemical divisions of lg oil companies (having ready supply of  propylene for polymerization) o In polymerization step, specialized catalysts used to produce polymer molecules that are capable of  crystallinzing when formed into fibers Metallocene  system—newer catalyst; used by several producers Produces purer polymers that are more uniform in size o After polymerization, polymer extruded and cut into pellets—shipped as  resin  to fiber/film producers o May be melt spun into fiber filaments or laid down in fiber web to form nonwoven fabric Fibrillated split OR slit and drawn into network of fibers o Polyolefin supply chain differs from that of most other manufactured fibers be smaller in scale
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o Because difficult to dye, easier to add pigment colors during spinning o Additives to alter fiber properties (light or flame resistance) may either be put in before spinning or  incorp. Into polymer resin @ polymerization stage - Molecular Structure o Methyl groups (--CH 3 ) on every other carbon on polymer backbone
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HUEC 2040-CH. 10 OUTLINE - CHAPTER 10OLEFIN FIBERS Often...

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