CM8001

Acetone dissolves the polymer, allowing the gas of the forming agent to escape. The polymer collapses on itself and becomes dense, as the gas has been removed. The polymer rearranges itself and becomes more dense.

a. lacks the required strength
b. it allows for sufficient flexibility

No. For plastic, the molecules are aligned parallel to one another, in the direction of the pull. There are weak forces/attraction between the molecules, allowing them to slide across one another, although the process is not reversible and the bag will tear eventually. The paper will tear instead of stretch since the molecules in paper are held rigidly in place and are not aligned

a. bio compatible (non-soluble + non reactive to bodily fluids), non toxic, stable, cheap, tiny pore size sufficient for water vapour to pass through.

b. polymethylmethacrylate (PMMA) and polyacrylamide/silicon based polymer. Properties include transparency, flexibility, low density, tough, unreactive, lets oxygen pass through, cheap, non-toxic, durable, comfortable.

c. Hard–> PMMA (hard, rigid, not comfy. Does not let oxygen pass through. Does not contain nitrogen atoms
soft–> polyacrylamide/silicon based (similar to the polymers/silicon based. Used to make acrylic fibres for fabrics. It absorbs water, making it more flexible and comfortable for the wearer.