I have some DMA curves of PC+ABS from different batches. The PC loss modulus peak is fairly consistent but one batch has a peak value 10degC lower than the rest. Another peaks at the normal value, but the G'' is 50% lower. What can cause these differences?
Hi Nat, if possible post an overlay of a "normal sample" and the sample in question. G`, G" and TanD. Is this a blend of PC and ABS?
While polycarbonate is a homopolymer having macromolecules built of identical units througout the whole length, acrylonitrile-butadiene-styrene is a terpolymer with chains comprising 3 different monomers differing in chemistry and rigidity. Moreover, proportion of each monomer in ABS plastics may vary from producer to producer and from batch to batch depending on the desired balance of properties and target application. Accordingly, temperature position, shape and intensity of DMA loss peaks associated with ABS glass transition may vary as a function of the chains composition, architecture, flexibility and mobility.
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