Introduction Flashcards

1
Q

natural polymers occur in nature and are synthesized by ____

A

cells

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2
Q

types of natural polymer

A

polysaccharide

protein

polynucleotides

polyisoprene

polyester

lignin

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3
Q

polyisoprene makes

A

natural rubber

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4
Q

polysaccharides make

A

gums

gel-forming

structural (cellulose)

reserve of energy (amyloses, amylopectin, starches/glycogen)

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5
Q

polyester

A

corks

suits

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6
Q

problems with natural polymers

A

not easily molded

hard to synthesize in the lab

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7
Q

what is a synthetic polymer?

A

synthesized by scientists

use known chem rxns. and processes

mostly made from organic s.m.

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8
Q

petroleum

A

gets refined into 90% fuel and 10% petrochemicals

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9
Q

petrochemicals

A

solvents

monomers (polymers)

other organic compounds

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10
Q

types of synthetic polymers

A

plastic

fiber

film

elastomers

adhesives

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11
Q

plastic definition

A

material that can be heated & molded

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12
Q

2 types of plastic

A

thermoplastic

thermoset resin

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13
Q

thermoplastic

A

can be reprocessed by reheating

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14
Q

thermoset resin

A

when heated and molded it chemically reacts to form a 3-D network

can’t be remolded upon reheating b/c won’t melt

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15
Q

fibers

A

polymers w/ high strength in one direction that can be processed into long strands

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16
Q

uses of fibers

A

textiles (relatively weak)

commercial monofilament fishing line (pull up to 80 miles long)

bulletproof vests (aramids)

17
Q

films

A

polymers with 2-D strength

processed into thin flexible sheets

18
Q

examples of films

A

polyethylene

polyester

19
Q

elastomers

A

rubbery polymers w/ stretching ability

20
Q

examples of elastomers

A

polybutadiene

polyisoprene

golf balls, tires, latex gloves, rubber bands

21
Q

adhesives

A

glues & sealants that are rubbery or hard after dry

22
Q

examples of adhesives

A

epoxies

polyvinyl alcohol

polycyanoacrylate

23
Q

why use synthetic polymers?

A

replacement of conventional materials

mostly organic (lower density compared to glass, metal, ceramics)

lighter, therefore higher strength to weight ratio

24
Q

pros of polymers

A

diff physical/mechanical properties, chemically resistant

made optically clear, translucent, opaque, textured, multicolored

takes less E to produce/lower mass/less s.m. needed

25
Q

protein

A

egg whites

gelatin

collagen/elastin

silk/wool

26
Q

lignin

A

binder that holds cellulose fibers together

cell walls