Which of the following amorphous plastics has the highest glass-transition temperature? a. PE b. PVC c. PS d. PP
Among the amorphous PE, PVC, PS, and PP polymers, c) PS (polystyrene) has the highest glass-transition temperature.
Which of the following amorphous plastics has the highest glass-transition temperature? a. PE b. PVC c....
16(2 points) Which of these monomers is the repeating unit for PTFE? a)FF b) H H C-C C-C H CH3 c) H H C-C НН d) H H C-C H CI 17 (2 points) Metals typically have a Poisson's ratio of: b) 0.3 c) 0.5 d) -0.35 18(2 points) Select a material which is an amorphous material a) Diamond b) Glass c) Steel d) Granite 19(2 points) The mobility of an electron is strongly affected by (circle all that apply)?...
The glass transition temperature of PS and PB are 95 °C and -90 °C, respectively. What is the glass transition of 50 wt% PS - 50 wt.% PB of immiscible polymer blend?
1. Which one of the following has the lowest Tg? H H нн нн м dooсн) H CH3 H H CI. (b) Polymethyl methacrylate (PMMA) (d) Polyvinyl chloride (a) Polypropylene (PP) (c) Polystyrene (PS) (PVC) Answer: 2. Which one of the following has the highest T? нн CH,CH н ni н CI (d) Polyvinyl (c) Polyethylene terephthalate (PET) (a) Polypropylene (PP) (b) Polystyrene (PS) chloride (PVC) Answer:
Material science 1) Polypropylene (PP) has a glass-transition temperature of -15 oC and a melting temperature of 175 oC. This means that at a temperature of -40 oC that PP is ________, and at temperature 0 oC PP is _________ . (A) brittle, brittle (B) ductile, brittle (C) brittle, ductile (D) ductile, ductile (E) low in thermal conductivity, high in thermal conductivity. .2) Galvanized steel corrodes slowly in air because: (A) the...
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...
Which of the following polymers would you expect to have a higher glass transition temperature? Explain why and assume equal degrees of polymerization. a. -[CH2CH2NH]- b. -[CH2CH2O]-
(9a) What material type has a glass transition temperature (Tg)? (9b) How do the material properties differ below and above the glass transition temperature (Tg)? (9c) What material type has a melting temperature only and no Tg?
High density polyethylene (HDPE) has a glass transition temperature below 0 C. However, HDPE appears as plastic rather than a rubbery material at room temperature. Why? (Max 100 words) (5 Points) Enter your answer What is the glass state? What is the glass transition temperature? (Max 100 words) (5 Points) ) Enter your answer Why polymers do not want to mix? (Consider the entropy and enthalpy effects, and compare to small molecular compounds.) (Max 100 words) (5 Points) Enter your...
Identify the temperature at which O2 has the highest velocity. A. 900K B. 650K C.500 K D. 1000K E. 325K
The following figure describes the cooling process of polyethylene (PE). Determine whether the following statements are true or false. Liquid Rubbery State Specific Volume Glassy State Temperature Tg Tg (a) The cooling rate of 2 is faster than the cooling rate of 1. True ()? or False ()? (b) The solid PE created by the process 1 has a higher density than the solid PE created by 2. True ()? or False ? (c) The solid PE created by the...