Question

1. What do we mean by thermoplastic polymer? 2. What is the definition of thermosetting polymer? 3. What is glass transition temperature (as it relates to polymers)?

Answer 1

Answer 1. What do you we mean thermoplastic polymer. - These are the polymer of repeating I monomeric unit it become soft upon when heated e can be easily molden into variety or different shape it can be recycle known as thermoplastic polymer. e.g. pipes, insulator. 2. What is the definition of thermosetting polymer. 0 It is the polymer it cannot be soften upon heating but decompose by heating, it cannot be recycle this polymer is known as thermosetting polyme. 3. What is glass transition temperature (as it related with polymer) - The temperature at which polymer acquire all properties of glass is known as glass transition temperature. At this temperature polymer is act like glass.

4. What is the meaning of crosslinking as it 1 related with polymer In the cross linking pohmer each chain & of polymer is bind with another chain by covalent bond or by a chemical or physical bond. egi sulphur is used for cross linking of rubber known as Valconisation of rubber S. In term tensile strength, melting point etc. how does the cross link polymer compare with non cross link polymer 7 All the properties link tensile strength, melting point rigidity, hardness is increases due to the cross link on these properties are increases due to the generation of chemical or physical bonding in the polimer.

Draw a simple schematic diagram of linear polyeth lene and cross linked polyethy- lene > the che che che ci ha poltethylene. اس پر چاک مسلم ) 127 Echte air than the ci che cross linked poldethylene