polymers Flashcards

1
Q

thermoforming or thermosetting: known as thermo pastics

A

thermoforming

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2
Q

thermoforming or thermosetting: known as thermo sets

A

thermosetting

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3
Q

thermoforming or thermosetting: have strong chemical bonds

A

thermosetting

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4
Q

thermoforming or thermosetting: can be re-moulded without affecting the materials physical properties

A

thermoforming

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5
Q

thermoforming or thermosetting: long chains of loose molecules

A

thermoforming

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6
Q

thermoforming or thermosetting: have strong cross links

A

thermosetting

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7
Q

pros of thermosetting:

A

hard
can withstand high temp
durable

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8
Q

cons of thermosetting

A

cannot be remodeled

cant be recycled

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9
Q

pros of thermoforming

A

good quality

highly skilled operator is not needed

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10
Q

cons of thermoforming

A

costly

can only have large plastic sheets

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11
Q

properties of hardwood

A

sheds leaves
thick trunks
takes long grow

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12
Q

properties of softwood

A

doesnt shed
thin trunks
doesnt take long to grow

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13
Q

stock form of hardwood

A

PSE

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14
Q

stock form of softwood

A

Dowel

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15
Q

stock form of manufactured wood

A

sheet

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16
Q

what is strength

A

the amount of load or compression it can withstand

17
Q

what is toughness

A

absorbtion of energy through shock before splitting

18
Q

what is elasticity

A

will it return to its shape after being compressed

19
Q

what is hardness

A

how resistant is the surface, will it survive scratches knocks and abrasion