Question

1. When you compare thermosetting with thermoplastie polymers, which kind do you think is easier to recycle? Explain. 2. Draw the structural formula of the polymer that would be formed from a) CH2=CHCI b) CF2 = CF2 3. Very pure Poly(dimethyl siloxane) is used in many silicon implants such as ear prosthesis, chin and breast implant, catheter etc. The polymer is formed according to the reaction : CH, CH, n CI- Si-CI - HO-Si-OH - O-SI- 2n H, 0 CH, CH, CH Poly(dimethyl siloxane) a) What type of polymerization is this? b) What other by-product would be formed from such a reaction? 4. Indicate whether any of the following are polymers or not a) Liquid foam ( like shaving cream) b) Jello c) Teflon

Answer 1

ANS-1****Thermoplastics vs. Thermosets
*****Thermoplastics are easily recyclable, compared to thermosets, because the polymer chain does not degrade when melted down. The weaker interactions between polymer chains break down at much lower temperatures than the chemical bonds between monomers, allowing thermoplastics to be recycled indefinitely until the polymers are broken down to the point that the material loses structural integrity . ******A thermoplastic is a polymer that becomes pliable or moldable above a specific temperature, and returns to a solid state upon cooling. Most thermoplastics have a high molecular weight, whose chains associate through intermolecular forces. ****** This property allows thermoplastics to be remolded due to the intermolecular interactions that spontaneously reform upon cooling.this make easier to recycle of THERMOPLASTICS
| 2. 1911 CH2 = CH - (che can (6) n (f2 = Ck2 - f cfe-chat 3.) Type of Paymerization - Condensation Belymen zation © By Praduct = HCI (4) a liquid foom - Yes a Jello – yes. Contain Protein a Teflon - yep. WWWUWUNNITTTTTTTT