Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
Tg represents the temperature where a polymer becomes more flexible.
B
Tg is the temperature at which all polymers become crystalline.
C
A lower Tg indicates that a polymer is more likely to remain rigid at room temperature.
D
Polymers with a high degree of branching, like LDPE, usually have a lower Tg.
E
Tg can influence the applications of polymers in various industries.
Understanding the Answer
Let's break down why this is correct
Answer
The glass transition temperature (Tg) is the point at which a polymer changes from a hard, glassy state to a softer, rubbery state as it gains thermal energy. This transition occurs when the polymer chains have enough mobility to move past each other, and it is influenced by chain flexibility, intermolecular forces, and the presence of plasticizers or cross‑links. A higher Tg means the polymer remains rigid at higher temperatures, while a lower Tg means it softens sooner. For example, polystyrene has a Tg around 100 °C, so it stays brittle above that, whereas polyethylene’s Tg is about –120 °C, so it is flexible even at very low temperatures.
Detailed Explanation
The glass transition temperature marks the point where polymer chains gain enough freedom to move, so the material becomes more flexible. Other options are incorrect because Tg is not about when polymers become crystalline; A lower Tg means the polymer will be more flexible at room temperature, not rigid.
Key Concepts
Polymer Glass Transition Temperature (Tg)
Polymer Properties
Crystallinity in Polymers
Topic
Polymer Glass Transition Temperature
Difficulty
easy level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1Which factor is most likely to increase the glass transition temperature (Tg) of a polymer, thereby enhancing its suitability for high-temperature applications like automotive components?
mediumChemistry
Practice
2
Question 2How does an increase in glass transition temperature (Tg) affect the thermal stability and processing conditions of a polymer during manufacturing?
mediumChemistry
Practice
3
Question 3At which temperature range would you expect a polymer to transition from a hard state to a more flexible state, indicating its glass transition temperature (Tg)?
easyChemistry
Practice
4
Question 4Which of the following scenarios best illustrates how variations in molecular weight and chemical composition can affect the glass transition temperature (Tg) and subsequently influence the manufacturing conditions for a polymer used in a medical device?
hardChemistry
Practice
5
Question 5Which of the following statements are true regarding condensation polymerization and its applications? Select all that apply.
hardChemistry
Practice
6
Question 6Which of the following statements about polymer morphology are true? Select all that apply.
mediumChemistry
Practice
7
Question 7What is the primary reason that a polymer becomes flexible and rubbery above its glass transition temperature (Tg)?
easyChemistry
Practice
8
Question 8How does the Glass Transition Temperature (Tg) of polymers influence their use in high-temperature applications?
mediumChemistry
Practice
9
Question 9Which of the following statements best explains the significance of the glass transition temperature (Tg) in polymers?
mediumChemistry
Practice
Ready to Master More Topics?
Join thousands of students using Seekh's interactive learning platform to excel in their studies with personalized practice and detailed explanations.