PBUAPortland Baseball Umpires Association (Oregon)
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References in periodicals archive ?
which can be associated with the relaxation of the rubbery PBuA blocks ([T.sub.g,PbuA] = -30[degrees]C) and the stiff PMMA blocks ([T.sub.g,PMMA] = 120[degrees]C).
Both have a poly(butylacrylate) (PBuA) central block; MAM has two terminal poly(methyl methacrylate) (PMMA) blocks and MAM-N has two terminal blocks based on random copolymers of methylmethacrylate (MMA) and N,N'-dimethylacrylamide (DMA).
In the M52 and M52N block-copolymers, PBuA is the immiscible block causing segregation in epoxy, and PMMA and P(MMA-co-DMA) are the miscible blocks giving compatibility toward epoxy.