Group 45 | Group Name : ONG PEI NING JOCELYN TAN SHIMIN LOH WEIJIN MACS GOH CHIA CHOON VONG CHERNG HAO RICHMOND NEO YU WEI |
Group Members : Group 45 |
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1.
Acetone dissolve foaming agent in styrofoam where it evaporates. Foaming agents are removed too. Therefore PS is the denser substance. Styrofoam contains a lot of air. Dissolves the polymer –> Gas escapes –> molecules can rearrange into a more compact structure –> denser |
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2.
a. Branched LDPE does not have a high resistance to being cut due to weak IMF. Therefore, it cannot be used for liners in surgical gloves. LDPE is flexible and not resistant to cut due to branched polymetric structure –> weak IMF b. Linear HDPE is stronger than LDPE because there are higher surface of contact for intermolecular forces of attraction to occur. Thus HDPE is stronger. |
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3.
It does not happen to papers as it does not have the structure to allow for dislocation motion of its atoms. Since dislocation motion does not happen, deformation does not happen. Dislocation motion = slipping of a group of bonded atoms along the dislocation plane. Polymer: % molecules –> IMF –> Weak forces of attraction –> broken and reformed quickly –> broken and reformed = stretchable |
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4.
a. Non toxic, non biodegradable, chemical resistent to rust, chemically stable, bio-compatible. |
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5. [301] |
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6. [303] |
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7. [305] |
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8. [307] |
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9. [309] |
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10. [311] |