What are the processes by which polymer foams are produced.

Engineering

1 answer:

Oksana_A [137]3 years ago

7 0

Answer:

1.Molding

a.Cold molding

b.Hot molding

2.Slab stock

Explanation:

Polymer foam:

When solid and gas phases are mixed then they produce polymer foam.The gas used during forming of polymer foam is know as blowing agent and can be physical or chemical.Physical agent will not react and act as inert while chemical agent take part in reaction.

Blowing agent-Carbon diaoxide and Hydrochlorofluorocarbons.

Example of polymer foams-Polyurethane ,Starch etc.

Polymer foam can be produce by following process

1.Molding

a.Cold molding

b.Hot molding

2.Slab stock

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Rudik [331]

Answer:

Two points

Explanation:

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3 years ago

A cylindrical metal specimen having an original diameter of 10.55 mm and gauge length of 54.5 mm is pulled in tension until frac

kumpel [21]

Answer:

(a) 53.94%

(b) 26.61%

Explanation:

Change in area will be given by

$\triangle A=\frac {\pi(R_o^{2}-r_n^{2})}{\pi R_o^{2}}$ where $\triangle A$ represent change in area R is radius and subscripts O and n represent original and new respectively.

Substituting 10.55/2 for original radius and 7.16/2 for new radius then

$\triangle A=\frac {\pi(5.275^{2}-3.58^{2})}{\pi 5.275^{2}}\times 100\approx 53.94$

(b)

Similarly, percentage elongation will be found by dividing the change in length by the the original length. In this case, rhe original length was 54.5mm and goes to 69 mm so the change in length is given by subtracting the final length from the original length

Percentage elongation is $\frac {69-54.5}{54.5}\times 100\approx 26.61$