INTERNAL TRAINING R&D (CROSSLINKING)

Sulphur Vulcanization is the process for the whole technology of hydrocarbon rubber with olefinic saturation and basis for major industrial usage of linear polymers?

• True

• False

The objectives of compound are as per following except:

• To produce a formulation whose final physical and chemical properties are fully suited to the functions of final product

• To increase elastic modulus of rubber and improve dimensional stability

• To achieve maximum cost efficiency of ingredients used.

• To ensure the compound will undergo processing with each and consistency.

Which of the following is not the component of latex compound?

• Defoamer

• Destabilizer

• Filler

• Dispersing agent

How to assess extent of pre-cure achieved during maturation?

• Heat and chemical stability tests

• Stress strain measurement (PRM)

• Swelling Index of thin latex dipped film

• Chloroform test on latex film

What are the changes that occur during crosslinking?

• Extension at break increase progressively

• Increased resistance to solvent attack

• Tear strength passes through a minimum

• No longer thermoplastic

Choose vulcanization types:​

• Amine

• Metal oxide

• Peroxide

• Sulphur

Select two widely used vulcanization process​

• Prevulcanized followed by drying​

• Post vulcanization followed by maturation

• Drying followed by prevulcanized

• Maturation followed by post vulcanization​​

CC crosslink are stronger and stable than sulfidic crosslink​?

• True

• False

Degree of cure and cure rate are affected by​:

• Temperature of curing

• Duration of curing​

• Dosage and ratio of curing agent​

How to predict shelf life of glove​?

• Accelerated aging. Glove subjected to extended controlled heating in oven 70c for 7 days

• Accelerated aging Accelerated aging. Glove subjected to extended controlled heating in oven 70c for 2 days​

• Property monitored by DSC method