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Trends in Non-Metallic Character of Elements

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Trends in Non-Metallic Character of Elements

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Questions and Answers

What is the main factor that determines the nature of a silicone polymer?

Length of the alkyl group

Thermal conductivity

Extent of cross-linking (correct)

Presence of oxygen atoms

Which type of silicones are bridged together by methylene or similar groups?

Cross-linked silicones

Linear silicones

Silicone resins (correct)

Cyclic silicones

How are cyclic silicones obtained?

By hydrolysis of R2SiCl2 (correct)

By blending with organic resins

By the condensation of dialkyl or diaryl silicon chlorides

By hydrolysis of RSiCl3

What property makes all silicones water repellent?

Organic side groups surrounding the silicon (A) Signup and view all the answers

Which type of silicones are obtained by blending with organic resins such as acrylic esters?

Silicone resins (B) Signup and view all the answers

What determines whether silicone polymers range from oily liquids to rubber-like solids?

Extent of cross-linking (B) Signup and view all the answers

What makes the viscosity of silicone oil remain constant and not change with temperature?

'Oily' nature of lower silicones (C) Signup and view all the answers

Which type of silicones are obtained by the hydrolysis and subsequent condensation of dialkyl or diaryl silicon chlorides?

'Linear' silicones (A) Signup and view all the answers