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Soy protein films were thermally laminated with either single or double coats of corn-zein. Microstructural characterization of the surfaces and cross-sections reveals a ductile protein matrix of the soy component, but a brittle layered structure for the corn-zein component. The hydrophobic nature of the corn-zein improved the water vapor barrier properties of the laminates, while the superior oxygen barrier characteristics remained unaffected, as compared with the base soy film. The haze values of the laminates increased without much change in total light transmission. Tensile properties supported observations from microscopy, in that tensile properties indicated ductile behavior of the soy films, but a brittle behavior for the double-coat laminates.

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Extrusion film casting (EFC) is an important melt processing operation which is extensively used to make polypropylene (PP) films. Linear PP shows significant amount of necking and draw resonance during EFC. One of the ways to reduce necking is to introduce long chain branches (LCB) on the polymer backbone. The long branches impart extensional strain hardening behavior thereby stabilizing the melt flow. In this work, we investigate the influence of long chain branching in polypropylene on the extent of necking in the EFC process. Laboratory scale EFC experiments were performed on homopolymer PP of linear and long chain branched architectures. Simulations of the EFC process were carried out using the one‐dimensional flow model of Silagy et al., Polym. Eng. Sci., 36, 2614 (1996) into which we incorporate two different multi‐mode molecular constitutive equations namely, the ‘eXtended Pom‐Pom’ equation (XPP, for long chain branched PP) and the ‘Rolie‐Poly’ equation (RP‐S, for linear PP). Our experimental data confirm that presence of long chain branching in PP reduces the extent of necking and our numerical predictions show qualitative agreement with experimental data, thereby elucidating the role of chain architecture on the extent of necking. POLYM. ENG. SCI., 55:1977–1987, 2015. © 2014 Society of Plastics Engineers

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