By A.N. Prokunin
This monograph offers theoretical and experimental stories of flows of elastic beverages. Falling into this classification are quite the melts and focused ideas of such flexible-chain polymers as polyethylene, polyisobutylene and polypropylene, all of that are commonplace in polymer processing. those polydisperse polymers range drastically, from batch to batch, of their mechanical homes and 20% edition in a estate is assumed to be more than enough. l 7 All contemporary books - dedicated to the rheology of polymers don't resolution the query of which constitutive equations will be used for fixing the fluid mechanic difficulties of polymer processing within the ordinary case of an considerable nonlinear area of deformation the place nonlinear results of shear and extensional elasticity are extremely important. Viscoelastic constitut ive equations stated normally (see, e.g. Refs five and six) don't describe at the same time even the best circumstances of deformations, viz. basic shear and uniaxial extension. additionally, a few of them are internally inconsist ent and infrequently reveal hugely volatile behaviour in uncomplicated flows with none primary purposes. much more revered molecular ap unfastened from those defects.
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