Question

kindly help me answering these quest. please type the answer, don't hand writes please.

part 3- synthesis of PVC gel.

8) properties of original polyvinyl alcohol solution>.......................

9) properties of the final gel...................

10) compare the properties of the PVC solution to the PVA after adding the sodium borate solution. how is the substance different?

11) how is the viscosity of the PVA affected by adding different amounts of sodium borate?

12) do you think the polymer strands in Teflon TM tape are arranged randomly or in parallel.?explain?

13) when HDPE is stretched, a"neck" can form. what do you think happens to the arrangement of the polymer strands in this region of the polymer? explain?

14) when you made nylon you were warned that monomers can be hazardous but that the polymer, once rinsed, is relatively harmless. explain the difference in hazard between the monomers and the polymer?

15) what can you claim about how polymer properties are affected by the molecular structure of the polymer? compare polymers based on chemical composition, cross-linking, and other structural features?

part 1- testing the strength and degradation of polymer films:

1) properties of Teflon tape:...................

2A) initial properties of high-density polyethylene(HDPE) film:........................

2b) properties of stretched high-density polyethylene(HDPE) film:.....................

3) how did the strength of the Teflon and stretched HDPE change with direction?

part 2- synthesizing Nylon

4) properties of wet nylon strand:...........

5) properties of dried nylon strand:..............

6) how did the lengthwise strength of your nylon strand differ from its crosswise strength?

7) how did the properties of the wet nylon differ from those of the dry nylon?

Answer 1

Part-3 Synthesis of PVC gel.

8) Properties of original polyvinyl alcohol solution are

a) It is a synthetic polymer that is soluble in water.

b) It is effective in film forming, emulsifying, and has an adhesive quality.

c) It has no odor and is not toxic, and is resistant to grease, oils, and solvents.

d) It is ductile but strong, flexible, and functions as a high oxygen barrier.

9) Properties of PVC gel are

a) PVC gel forms a fibril-like network structure.

b) Crystallinity is very low for PVC gels.

c) PVC gel has a thicker network structure due to a larger degree of polymer aggregation.

d) The mesh size of the polymer network decreases with increasing polymer concentration.

10) Comparison of properties of PVA and PVC solution are,

a) The surface of PVA are more homogenous than that of PVC.

b) PVA has high electrical conductivity than PVC.

c) Both PVC and PVA are resistant to grease, oils, and solvents to a great extend.

d) PVC is brittle whereas PVA is ductile.

When sodium borate is added to PVA, a slime is formed which creates cross links between polymer chain.

11) The viscosity of PVA increases on adding sodium borate. More the sodium borate we add, the more cross links are formed between polymer chains which make the slime more viscous.

12) The polymer strands in the Teflon tapes are parallel in alignment to the long sides.When PTFE is made into tape, all of its polymer chains get ordered or lined up that make the polymer much stronger in one direction than another.