Question

Polyethylene structure 1. Based on the structure shown above, polyethylene has a structure A. linear B. branched C cross linked D. 3D network 2. Based on the structure shown above, polyethylene is a polymer A thermoplastic Bermoset 3. Based on the structure shown above, polyethylene is talement below les transition and temperature A soll, ductile (1) strong stift B. strong, if(t) soft, dustile c. trong ductile), brindle 4. What will be the effect on stiffness if an placed by Chead of A wifes will increase C wifes will decrease 5. Given that the molecular weight of the polyethylene can be ined by increase length of the polymer chain, which polyethylene will higher A with the verge molecular weight Che polyetyle with weglecular prostate the 6. Kucts" are region of very denne microstructure, which strengthen timber around the knot A True B. Fale 7. Along the axial (parallel to grain) direction, wood exhibits higher teile songth than transverse direction A True B. Pole 8. Cellulose polymeric chains are aligned along the radial direction in hardwood od tres A. True B. Pose 9. Most of the shrinkage in wood occun during the time it is dried from fiber saturation point A True B. False 10. Asphalt cutback is a combination of asphalt binder und toluene A True B. False 11. Asphalt binder is essentially a combination of update and persileme A True B. False 12. With continued Exposure to oxygen and UV light pa increase in material ductility over time A True B. False 13. Asphalt concretes belle is lowmeter ending onder A True B. Fale 1. Ruting in plat concrete perment can occur in winter ander bewy wheel leuk B. Fale A True 15. Surength and module of city of phy A The 1. Palue
If u could please answer parts 1-15.

Answer 1

1. (A) Linear Structure - The provided structure shows a long chain of carbon atoms, with two hydrogen atoms attached to each carbon. Hence, it is a Linear Structure. Sometimes some of the carbons, instead of having hydrogen attached to them, they might have polyethylene branches get attached. In that case, it is said to be a Branched Structure.

2. (A) Thermoplastic Polymer - It is based on the way, a plastic responds to heat. The thermoplastic polymer can be heated to a melting point, cooled, and then reheated without any degradation, which is the significant attribute of a thermoplastic polymer.

3. (B) (i) Strong, Stiff (ii) Soft, Ductile - At a glass transition temperature, polymer experiences a transition from a rigid state to a rubbery state.

4. (A) Stiffness will Increase - Exchanging the alternate side groups with CH3 will become Polypropylene. Polypropylene is stiffer than Polyethylene.

5. (B) One with an average molecular weight of 22400 g/mol will have higher strength - In general, for polymers, when the molecular weight increases, it also increase its strength.

6. (B) False - Knots are defects that weaken the timber.

7. (A) True - Tensile strength of wood is larger in axial direction compared to transverse direction.

8. (B) False - Cellulose chains are aligned parallel to each other.

9. (B) False - Shrinkage will start only after reaching the fiber saturation point.

10. (A) True - Cutback asphalt is simply a combination of petroleum solvent and asphalt cement (binder).

11. (A) True - Principle constituent for Asphalt is Petrolene and Asphaltene.

12. (A) True

13. (B) False

14. (A) True

15. (A) True