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WorksheetsPlastics, an introduction
Total questions: 13
Worksheet time: 8mins
Mention the two parts that make up a plastic
monomer and fillers
monomer and pigments
polymer and additives
pigments and fillers
The melt temperature (Tm) in a semicrystalline polymer is lower than its glass transition (Tg).
True
False
Elastomers are characterized by all these properties EXCEPT one, identify it:
Very low density
Abrasion and wear resistance
They are recyclable
Thermal insulator
What does the thermal expansion coefficient measure?
the changes of length by degree per temperature
the changes of proportionality per Kelvin grade
the changes of proportionality per degree of temperature
Amorphous thermoplastic polymers tend to have greater chemical resistance than semicrystalline.
True
False
Polymers are good ________________ and __________________ insulators.
(a)
Identify the polymer with recycling code number 4
LDPE
HDPE
PP
PET
Stabilizers are used to inhibit the degradation mechanisms in polymer processing:
True
False
This material can be found in imitation leather, flooring, and inflatable products.
Polypropylene
Acrylic
flexible PVC
Polyester
what kind of chemical bonds are found in thermoplastics?
just covalent bondings
just ionic bondings
just Van der Waals
Covalent bondings and Van der Waals
Covalent and ionic bondings
Polymers are (a) insulators.
Identify the five polymer families that make up 95% of the global market.
Acrylics, polyolefins, PVC, esters, acetals
Acetals, polyamides, esters, PVC, styrenics
Polyolefins, PVC, polyurethanes, styrenics, and esters
Polyamides, esters, styrenics, polyolefins, acrylics
When burning, this plastic smells like burnt hair
PVC
PLA
PA
PHA
