Even in an article in 1938 on cross-linking copolymerization of acrylic acid with divinyl he laid the foundation for the core technology of today as " superabsorbent " designated products, for example in diapers are widely used.
22.
"' Composition drift "'occurs during the process of free radical copolymerization causing variation in the instantaneous mole fraction of a monomer added to copolymer, therefore altering the chemical composition of the copolymer over the period of conversion.
23.
One of these methods is introducing the precursor polymer made from copolymerization of VF 2 with either 1-chloro-2, 2-difluoroethylene ( CVF 2 ) or 1-bromo-2, 2-difluoroethylene ( BVF 2 ).
24.
Researchers at the Dow Chemical Company synthesized several fluorene-based copolymers by alternating copolymerization using 5, 5-dibromo-2, 2-bithiophene which showed yellow emission and 4, 7-dibromo-2, 1, 3-benzothiadiazole, which showed green emission.
25.
Similarly, the earlier studies of S 8 copolymerization with thiiranes ( propylene sulfide; PS ), at temperatures below T f for S 8 homopolymerization, revealed that the average sulfur rank in the copolymer was increased from 1 to 7 when 8 [ S 8 ] 0 / [ PS ] 0 ratio was increasing from 0 to 10.
26.
Other copolymerizations are also suitable; researchers at IBM performed random copolymerization of fluorene with 3, 9 ( 10 )-dibromoperylene, 4, 4-dibromo-R-cyanostilbene, and 1, 4-bis ( 2-( 4-bromophenyl )-1-cyanovinyl )-2-( 2-ethylhexyl )-5-methoxybenzene.
27.
As an example of copolymerization of non-homopolymerizable monomers, ?-butyrolactone ( BL ) and ?-caprolactone ( CL ) show that the copolymerization provides high molar mass polymers : The BL / CL copolymer synthesis is viable despite the fact that BL monomer addition to its own bl * active chain ends was highly reversible, as the bl * unit could be blocked via a practically irreversible CL addition.
28.
As an example of copolymerization of non-homopolymerizable monomers, ?-butyrolactone ( BL ) and ?-caprolactone ( CL ) show that the copolymerization provides high molar mass polymers : The BL / CL copolymer synthesis is viable despite the fact that BL monomer addition to its own bl * active chain ends was highly reversible, as the bl * unit could be blocked via a practically irreversible CL addition.
