Which of the following polymers is related to nylon ? a) PVC b)Teflon C)Kevlar
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Which of the following polymers is related to nylon ? a) PVC b)Teflon C)Kevlar
Predict the structure of the polyurethane polymer. Question Step-growth polymerization is another method used to make countless polymers, such as polyethylene terephthalate (PET), Nylon, Kevlar, and polyurethane Let's take a look at how polyurethanes are made Step 1: The alcohol (ethylene glycol) is deprotonated to form an alkoxide Step 2: The alkoxide attacks the electrophilic carbon of the isocyanate Step 3: The nitrogen is protonated to give a carbamate intermediate Step 4: Another alkoxide attacks the isocyanate (red) to form...
Answer these two questions 1- Which of the following polymers is crystalline: (a) Starch (b) Thermosetting (c) elastomers (d) polyacrylonitrile 2-Which of the following polymers has copolymer structure: (a) polyethylene (b) nylon 6,6 (c) polystyrène (d) propylene
Which of the following polymers is used in plastic bottles and plastic containers? Select one: a. LDPE b. PVC c. Polystyrene d. HDPE e. Polypropylene
Draw both the monomer and polymer structures of the following polymers Nylon 6,6 Poly(ethylene terephthalate)
i) Which of the following is not true about step-growth polymers? Formation of step-growth polymers usually results in the loss of a small molecule. Step-growth polymers are formed by the reaction of bifunctional molecules. Step-growth polymers can be formed by a free radical mechanism. Step-growth polymers are also known as condensation polymers. Step-growth polymers do not reach high molecular weight until the reaction has gone nearly to completion. ii) Which of the following are not termination methods in radical polymerization?...
1 a) b) Which polymers in the following figure does NOT show a clear endurance limit (select the best answer)? 25 PS PET 3 20 15 PMMA 2 Stress amplitude (MPa) Stress amplitude (ksi) 10 PP. Nylon (dry) 1 PE 5 PTFE 103 104 105 106 107 Number of cycles to failure PS PMMA PP PET O PE Which of the following materials is likely to have the highest Kic? inorganic window glass Rubber tyre O Nylon polycarbonate Concrete O...
Draw the structure of the monomer(s) employed to form each of the following polymers shown in the table of polymers of commerical importance. (a) polyvinyl chloride (b) nylon 6,6 (c) polyethylene terephthalate
Which of the following amorphous plastics has the highest glass-transition temperature? a. PE b. PVC c. PS d. PP
Which of the following is not considered true for polymers? O A. Polymers are transparent. O B. Polymers are recyclable. O C. Polymers are light and also hard to break. OD. Polymers are cheap and long-lasting. O E. Polymers can be easily processed to form various shapes.
QuestiorT Which of the following represents conductive polymers, which are conjugated polymers that can potentially be used to synthesize futuristic transparent and curved displays like those seen in the movies Minority Report and Iron Man? Your answer it trt O b. CI O c C. O d. 0