Group 37

Group 37	Group Name : Group 37
Group Members : NG SHI NING AGNES, RINITTHA D/O MATHIALAGAN, ALEXANDREA ANG SHIYING, IGNATIUS RANDY WONGSO, LAU RUI WEN
1. Acetone dissolves the polymer, dissolving the gas of the dissolving agent to escape. The polymer collapses on itself, and is more dense because the gas has been removed.
2. a) LDPE when branched is not strong enough for this application. b) Using linear LDPE allows for the HDPE molecules to line up in a manner that produces the required strength.
3. No. the plastic strip just narrows by aligning parallel to one another in the direction of pull (This is irreversible and will eventually break.) For paper, it tears rather than get stretched, because the cellulose molecules in paper are held much more rigidly in place, and are not free to align.
4. a) Stable, last for a long time, easy to implant, non- toxic b) HEMA ( hydroxyethyl methacrylate) for soft PMMA (polymethyl methacrylate) for hard Non toxic, comfortable to wear, inexpensive, conforms to eye-shape, easily cleaned. c) PMMA is hard and has no oxygen permeability and is rigid, but HEMA has oxygen permeability, and its flexible, making HEMA more comfortable.
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10. [311]

CM8001