Ionomeric functionalities, block

Synthesis and Characterization of Block Copolymers Containing Acid and Ionomeric Functionalities... 

In addition, the polymer modification reactions leading to acidic and ionomeric functionalities are described in detail. The derived ion-containing block copolymers may aid in the correlation of chemical architecture with ionomer morphology and properties. 

These results suggest that when the electrocatalytic zone is completely immersed in the perfluorocarbon fluid the diffusion of the reactants and/or products to the catalyst site is impeded by the blocking effect of the additive, which can be described as a flooded system. It is possible that the fluid also interacts with the ionomeric material in the electrocatalytic mixture, decreasing the ability to function as an proton conducting material owing to immiscibility of water with the perfluorocarbon compounds. However, the facility of reaction greatly increases as more of perfluorocarbon exits the system, as shown in Fig. 1.28. These results indicate that the presence of perfluorocarbon fluids have some beneficial effects upon the kinetics of oxygen reduction at Nafion -H-... 

Coran and Patel (1983b) have shown that the mechanical properties of dynamically vulcanized NBR-PP blends can be improved through copolymer formation between the two immiscible polymers concurrent with vulcanization. In the first example in Table 5.53, block copolymer resulted from reaction of amine-terminated NBR with anhydride-terminated PP. The latter was prepared through functionalization of PP with MA in the presence of radical initiator. In the second example, a block copolymer may have resulted from reaction of acid-terminated NBR with a primary amine-terminated PP. The latter was prepared in a prior reaction between maleic anhydride-terminated PP and triethylenetetramine. It is also possible that the block copolymer may be linked through ionomeric association resulting from protonation of PP-amine with NBR acid. 

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