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Q.A20 Complete the following sentence: The mechanical properties of polymers are... (A) brittle (B) ductile (C) highly elastic (D) diverse Q.A21 Which TWO statements are TRUE of the glass transition temperature?

Q.A20 Complete the following sentence: The mechanical properties of polymers are... (A) brittle (B) ductile (C) highly elastic (D) diverse Q.A21 Which TWO statements are TRUE of the glass transition temperature?

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter10: Fuels, Organic Chemicals, And Polymers
Section: Chapter Questions
Problem 110QRT
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Q.A20 Complete the following sentence: The mechanical properties of polymers are... (A) brittle (B) ductile (C) highly elastic (D) diverse Q.A21 Which TWO statements are TRUE of the glass transition temperature? (A) Rubber-like materials are brittle below the glass transition temperature (B) Rubber-like materials are brittle above the glass transition temperature (C) As a glass is cooled, it reaches the glass transition temperature and crystallises (D) Above the glass transition temperature, glasses can be easily formed into a variety of shapes Q.A22 When defining a composite there are three conditions that should be met. 1. Each component should have a reasonable presence 2. The components should have different properties What is the third condition of a composite material? (A) The phases should be chemically similar on a microscopic scale and combined without separation (B) The phases should be chemically distinct on a microscopic scale and separated by a distinct interface (C) The phases should be structured in sandwiched layers with a third component at their interface Q.A23 Which one of the following statements BEST describes the main role of the matrix material in a fibre reinforced composite? (A) Carries most of the loading on the composite. (B) Improves the composite processibility (C) Allows the formation of complex composite shapes (D) Lowers the cost of the composite (E) Transfers stress between the reinforcement phase constituents
Transcribed Image Text:Q.A20 Complete the following sentence: The mechanical properties of polymers are... (A) brittle (B) ductile (C) highly elastic (D) diverse Q.A21 Which TWO statements are TRUE of the glass transition temperature? (A) Rubber-like materials are brittle below the glass transition temperature (B) Rubber-like materials are brittle above the glass transition temperature (C) As a glass is cooled, it reaches the glass transition temperature and crystallises (D) Above the glass transition temperature, glasses can be easily formed into a variety of shapes Q.A22 When defining a composite there are three conditions that should be met. 1. Each component should have a reasonable presence 2. The components should have different properties What is the third condition of a composite material? (A) The phases should be chemically similar on a microscopic scale and combined without separation (B) The phases should be chemically distinct on a microscopic scale and separated by a distinct interface (C) The phases should be structured in sandwiched layers with a third component at their interface Q.A23 Which one of the following statements BEST describes the main role of the matrix material in a fibre reinforced composite? (A) Carries most of the loading on the composite. (B) Improves the composite processibility (C) Allows the formation of complex composite shapes (D) Lowers the cost of the composite (E) Transfers stress between the reinforcement phase constituents
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