No ones answer me whenever i upload a question everyone spams but never gives the right answer :( pls anyone answer me i am crying
Answers
Answer:
A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. Such a material is also known as a thermoset or thermosetting polymer. Initially, the polymer is a liquid or soft solid. Heat provides energy for chemical reactions that increase the cross-linking between polymer chains, curing the plastic. The rate of curing may be increasing in many cases by increasing pressure or by adding a catalyst.
Thermosetting plastics or Thermoset plastic are synthetic materials that strengthen during being heated but cannot be successfully remolded or reheated after their initial heat-forming called as Thermoset material.
Explanation:
Activity to compare strenth of synthetic and cotton fibres-
- Take an iron stand with a clamp and a cotton thread of about 65 cm length.
- Tie the thread to the clamp so that it hangs freely.
- At the free end suspend a pan so that weight can be placed in it.
- Add weight one by one till the thread breaks.
- Note down the total weight required to break the thread. This weight indicates the strength of the fibre.
- Repeat the same activity with threads of wool, silk and nylon.
- You will observe that the weight required to break the threads of wool, silk and^nylon is more than cotton. So, synthetic fibres are stronger than cotton.
Thermosetting plastic-
A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. Such a material is also known as a thermoset or thermosetting polymer. Initially, the polymer is a liquid or soft solid. Heat provides energy for chemical reactions that increase the cross-linking between polymer chains, curing the plastic. The rate of curing may be increasing in many cases by increasing pressure or by adding a catalyst.