Vulcanization — Winter 2024

Define the given terms: (i)Rate of Cure (ii)State of Cure (iii)Peak Cure

Differentiate unvulcanized rubber and vulcanized rubber.

Explain in detail about vulcanization conditions.

What do you mean by ‘Vulcanite’?

List major components of structure of rubber vulcanizate. Write on any two.

Explain in detail about the methods used to obtain uniform vulcanization throughout thick sectioned rubber articles.

With labeled diagram, explain the rheograph with it’s key features.

Show reasons for preference of sulphur vulcanization to diene rubbers.

Indentify role of accelerators in sulphur vulcanization with suitable examples.

Explain in detail about the ‘Dithiocarbamate’ type accelerators.

What is full form of ‘PVI’? Also brief out it’ role in vulcanization process.

Compare Conventional Vulcanization (CV) system with Efficient Vulcanization (EV) system suitable example.

Explain in detail about the ‘Thiuram’ type accelerators.

What do you mean by ‘co agent’? What is its role?

Categorize effect of cure system on crosslink types and vulcanization properties.

With suitable reaction chemistry, explain vulcanization of non-sulphur vulcanization of non-olefin rubber.

Which rubber is cured by Quione Dioxime? Why?

Give the advantages of jacketed autoclave over un jacketed autoclave. Also name the products which can be cured in autoclave.

With suitable reaction chemistry, explain vulcanization of non-sulphur vulcanization of olefin rubber.

How o state of cure is assessed by Mooney-Revlin equation?

Indentify advantages of Liquid Curing Method (LCM) over autoclave. Also brief out them.

With schematic diagram, explain rotocure vulcanization technique.

Tell principle of ‘Microwave Vulcanization’ technique.

Indentify the requirements to be followed during compounding of products to be cured by microwave vulcanization technique.

Explain in detail about water cure.