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What is the Flory switchboard model of polymer?
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ADRIANA
What is the Flory switchboard model of polymer?
Polymer gas, is made by catalytic polymerization (" Catpoly" ). The process is relatively old (1940's) timeframe--- not used much now. The feedstock is propylene and butylene. Since the catalyst (kiesulguhr) gives poor selectivity ( thus yields), other processes are preferred now, giving better octane.
Polymer gas, is made by catalytic polymerization (" Catpoly" ). The process is relatively old (1940's) timeframe--- not used much now. The feedstock is propylene and butylene. Since the catalyst (kiesulguhr) gives poor selectivity ( thus yields), other processes are preferred now, giving better octane.
This is a model to explain the occurrence and structures of crystalline regions of polymers such as polyethylene. These regions contain parallel strands lying alongside one another. The mutual attraction of like-for-like holds the strands together in this highly ordered array. Many of the strands in the array are parts of chains that criss-cross back and forth so that the same polymer chain furnishes several strands in the array. This has suggested the analogy of a telephone switchboard in which several cords are plugged into the board. Flory argued that the structure was a “random switchboard,” where the polymer chain might join the crystalline array, exit, then snake around and reenter to form another nonadjacent part of the array. Others disagreed with him, saying that there wouldn’t be room for all the outside snaking around. These others favored “adjacent reentry.” In that model, the polymer chain would exit, curve sharply around, and reenter the array exactly alongside its own self. I never heard whether the problem was solved one way or the other.
This is a model to explain the occurrence and structures of crystalline regions of polymers such as polyethylene. These regions contain parallel strands lying alongside one another. The mutual attraction of like-for-like holds the strands together in this highly ordered array. Many of the strands in the array are parts of chains that criss-cross back and forth so that the same polymer chain furnishes several strands in the array. This has suggested the analogy of a telephone switchboard in which several cords are plugged into the board. Flory argued that the structure was a “random switchboard,” where the polymer chain might join the crystalline array, exit, then snake around and reenter to form another nonadjacent part of the array. Others disagreed with him, saying that there wouldn’t be room for all the outside snaking around. These others favored “adjacent reentry.” In that model, the polymer chain would exit, curve sharply around, and reenter the array exactly alongside its own self. I never heard whether the problem was solved one way or the other.
Polymer gas, is made by catalytic polymerization (" Catpoly" ). The process is relatively old (1940's) timeframe--- not used much now. The feedstock is propylene and butylene. Since the catalyst (kiesulguhr) gives poor selectivity ( thus yields), other processes are preferred now, giving better octane.
Polymer gas, is made by catalytic polymerization (" Catpoly" ). The process is relatively old (1940's) timeframe--- not used much now. The feedstock is propylene and butylene. Since the catalyst (kiesulguhr) gives poor selectivity ( thus yields), other processes are preferred now, giving better octane.
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This is a model to explain the occurrence and structures of crystalline regions of polymers such as polyethylene. These regions contain parallel strands lying alongside one another. The mutual attraction of like-for-like holds the strands together in this highly ordered array. Many of the strands in the array are parts of chains that criss-cross back and forth so that the same polymer chain furnishes several strands in the array. This has suggested the analogy of a telephone switchboard in which several cords are plugged into the board. Flory argued that the structure was a “random switchboard,” where the polymer chain might join the crystalline array, exit, then snake around and reenter to form another nonadjacent part of the array. Others disagreed with him, saying that there wouldn’t be room for all the outside snaking around. These others favored “adjacent reentry.” In that model, the polymer chain would exit, curve sharply around, and reenter the array exactly alongside its own self. I never heard whether the problem was solved one way or the other.
This is a model to explain the occurrence and structures of crystalline regions of polymers such as polyethylene. These regions contain parallel strands lying alongside one another. The mutual attraction of like-for-like holds the strands together in this highly ordered array. Many of the strands in the array are parts of chains that criss-cross back and forth so that the same polymer chain furnishes several strands in the array. This has suggested the analogy of a telephone switchboard in which several cords are plugged into the board. Flory argued that the structure was a “random switchboard,” where the polymer chain might join the crystalline array, exit, then snake around and reenter to form another nonadjacent part of the array. Others disagreed with him, saying that there wouldn’t be room for all the outside snaking around. These others favored “adjacent reentry.” In that model, the polymer chain would exit, curve sharply around, and reenter the array exactly alongside its own self. I never heard whether the problem was solved one way or the other.
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