3.5cm 3 of a 0.16 mol/l solution of s-butyllithium in toluene was added to a sol
ID: 933356 • Letter: 3
Question
3.5cm3 of a 0.16 mol/l solution of s-butyllithium in toluene was added to a solution of 8.40 g styrene in 200 cm3. After complete conversion of the styrene, 28.00 g of isoprene was added. When the isoprene was completely polymerized, the reaction was terminated by the addition of 2.89 cm3 of 0.10mol/L dichloromethane (X-R-X) in toluene. Assume 8.40 g styrene = 8.40 cm3 and 28.00 g of isoprene =27.00 cm3.
Describe the block copolymer. Please view the following polymerization and termination scheme:
3.5cm3 of a 0.16 mol/l solution of s-butyllithium in toluene was added to a solution of 8.40 g styrene in 200 cm3. After complete conversion of the styrene, 28.00 g of isoprene was added. When the isoprene was completely polymerized, the reaction was terminated by the addition of 2.89 cm3 of 0.10mol/L dichloromethane (X-R-X) in toluene. Assume 8.40 g styrene = 8.40 cm3 and 28.00 g of isoprene =27.00 cm3. Describe the block copolymer. Please view the following polymerization and termination scheme:Explanation / Answer
A copolymer is made by more than 1 homopolymer. It requires more than 1 starting material.
A block coplymer is a type of copolymer where the repearting of one homoplymer (suppose A ) is covalently bonded to different repeating block of another homopolymer ( supoose B) , which is further attached to repaeting block A and futher B.
A schematic representation of block coplymeriozation is as -AAAA-BBBB-AAAA-BBBB-AAAA-BBBB-AAAA-BBBB-.
So, in the given example, initiallt BuLi is used as an initiator and reacted with styrene. The reaction forms a homopolymer with a repeating unit of styrene. This polymer is then reacted to a different compound that is isoprene to form a block coplymer of styrene and isoprene. The reaction propagates then. It is later terminated using CH2Cl2 (DCM) and we get two blocks of isoprene and styrene unit.
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