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Elastomers - Polymer Materials - Quiz, Exercises of Engineering Chemistry

Birla Institute of Technology and ScienceEngineering Chemistry

The main points are given below: Elastomers, Elastic Limit of Rubber, Soft Rubber, Carbon Black and Silica, Tensile Modulus, Tensile Strength, Typical Formulation for Tires, Vulcanized Rubber, Thermoplastic Elastomers, Commodity Plastics

Typology: Exercises

2012/2013

Uploaded on 04/17/2013

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MFGT 141 Homework 6: Elastomers Name:___________________
1. How much sulfur is added the following and how much is it cross linked?
A. Soft Rubber % sulfur = __________and % cross-linked = _____ and
B. Hard Rubber % sulfur = __________and % cross-linked = _____
2. What is the elastic limit of rubber? ________________________________
3. Carbon black and silica are fillers in rubber. Does increasing carbon black
increase or decrease the following?
A. Tensile strength _____________, B. Tensile modulus _______________,
C. CLTE________________, and D. Cost ____________
4. In a typical formulation for tires with vulcanized rubber, A. how much rubber is
present? __________________and B. how much sulfur?_________________
5. Explain how the soft and hard segments make thermoplastic elastomers (SBR,
EPDM, TPU, etc.) different than commodity plastics? ____________________
_______________________________________________________________
_______________________________________________________________
6. List the Tg for the following polymers:
a. Natural rubber?_________, b. Polychloroprene? __________,
c. SBR with typical 75/25 blend? _________ and d. Butyl rubber? ____
7. Are thermoplastic elastomers more likely to be homopolymers, copolymers, or
terpolymers? _______________
8. SBR advantages over natural rubber include ____________ and
_____________, whereas two disadvantages of SBR rubber to natural rubber
are _______________ and ________________.
9. What is the chemical structure of the following?
a. Natural rubber?_________________________________________-____,
b. b. Polychloroprene? ___________________________________________,
c. SBR __________________________________________ and
d. d. EPDM? __
10. Carbon black is a filler for elastomers. Does it increase or decrease the
following: hardness? ________ tear strength? _________ viscosity ?
________and why?
______________________________________________________
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MFGT 141 Homework 6: Elastomers Name:___________________

  1. How much sulfur is added the following and how much is it cross linked? A. Soft Rubber % sulfur = __________and % cross-linked = _____ and B. Hard Rubber % sulfur = __________and % cross-linked = _____
  2. What is the elastic limit of rubber? ________________________________
  3. Carbon black and silica are fillers in rubber. Does increasing carbon black increase or decrease the following? A. Tensile strength _____________, B. Tensile modulus _______________, C. CLTE________________, and D. Cost ____________
  4. In a typical formulation for tires with vulcanized rubber, A. how much rubber is present? __________________and B. how much sulfur?_________________
  5. Explain how the soft and hard segments make thermoplastic elastomers (SBR, EPDM, TPU, etc.) different than commodity plastics? ____________________
  6. List the Tg for the following polymers: a. Natural rubber?_________, b. Polychloroprene? __________, c. SBR with typical 75/25 blend? _________ and d. Butyl rubber? ____
  7. Are thermoplastic elastomers more likely to be homopolymers, copolymers, or terpolymers? _______________
  8. SBR advantages over natural rubber include ____________ and _____________, whereas two disadvantages of SBR rubber to natural rubber are _______________ and ________________.
  9. What is the chemical structure of the following? a. Natural rubber?_________________________________________-____, b. b. Polychloroprene? ___________________________________________, c. SBR __________________________________________ and d. d. EPDM? __
  10. Carbon black is a filler for elastomers. Does it increase or decrease the following: hardness? ________ tear strength? _________ viscosity? ________and why?

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MFGT 141 Homework 6: Elastomers Name:___________________

  1. If the surface area of a carbon black is increased, do the following increase or decrease? Abrasion resistance? ____________ and extrudate swell ?__________
  2. What is the name of the most common method of producing carbon black?
  1. Are carbon blacks conductive or non-conductive? ____________________
  2. List the common name of the following ASTM designated carbon blacks. A. 110 = ___________________, B. 220 = ___________________, C. 330 = ___________________, D. 660 = ___________________.
  3. Which carbon black from the list in #11 would have the largest particle size? ___________, and which one will have the largest amount of surface area? _________________.
  4. What is the average particle size of the carbon black? ______________
  5. Explain the state of the filler in the rubber mix? ________________________
  6. Explain the state of the rubber in the filled composite? ___________________
  7. Explain the failure properties of rubber? ______________________________
  8. Why does carbon black increase the properties of most polymers and elastomers? _____________________________________________________

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