Polymers Flashcards
What is a thermoplastic?
aka as thermoforming:
Can be repeatively reheated and reshaped
Allowing it to be recycled after use
Thermoplastic examples:
(poly)
Low density polyethylene - toys
High density polyethylene - toys
Polypropylene
Nylon
What is thermosetting Polymers?
Can’t be reheated and reshaped
Because the molecules form rigid links when they undergo chemical change from the heat
What is an elastomer?
Elasticity qualities; has weak bonds that allow deformation and the return back to original shape
Thermosetting polymer examples:
(resins and formaldehydes)
Urea formaldehyde
Melamine formaldehyde
Polyester resin
Epoxy resin
Elastomer examples:
Natural rubber
Neoprene
Silicone
What are Polymers made up of?
Multiple monomers, held by bonds
polymer based sheet and film examples:
foam board
fluted pp sheet
translucent pp sheet
styrofoam
low density polyethylene sheet (LDPE)
plastazote foam
cellulose acetate
polylactide
polymer forming processes
vacuum forming
calendering
extrusion
thermoforming
line bending
compression moulding
injection moulding
blow moulding
rotational moulding
lamination
polymer finishes
colour - adding pigment throughout manufacture
polymer stock forms
elastomer
what is biodegradable polymer
include additives that increase the process of it breaking down
types of bio-degradable polymer
oxy-degradable
hydro-degradable
photodegradable
how do degradable polymer work?
when they come into contact with light, water or oxygen they will be weakened and will break down
polymer enhancements:
bio-batch additives
antioxidants- thermal too
UV stabliser- prevent sun damage
pigments
lubricants
antistatic
flame retardants- reduce fire hazard
plasticisers- flexibility
fillers (talc) - improve stiffness and toughness
