Introduction Flashcards
natural polymers occur in nature and are synthesized by ____
cells
types of natural polymer
polysaccharide
protein
polynucleotides
polyisoprene
polyester
lignin
polyisoprene makes
natural rubber
polysaccharides make
gums
gel-forming
structural (cellulose)
reserve of energy (amyloses, amylopectin, starches/glycogen)
polyester
corks
suits
problems with natural polymers
not easily molded
hard to synthesize in the lab
what is a synthetic polymer?
synthesized by scientists
use known chem rxns. and processes
mostly made from organic s.m.
petroleum
gets refined into 90% fuel and 10% petrochemicals
petrochemicals
solvents
monomers (polymers)
other organic compounds
types of synthetic polymers
plastic
fiber
film
elastomers
adhesives
plastic definition
material that can be heated & molded
2 types of plastic
thermoplastic
thermoset resin
thermoplastic
can be reprocessed by reheating
thermoset resin
when heated and molded it chemically reacts to form a 3-D network
can’t be remolded upon reheating b/c won’t melt
fibers
polymers w/ high strength in one direction that can be processed into long strands