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- W980006678 abstract "It is recognized that the orientation state of the crystalline and non-crystalline phases largely dictates the performance of blown films in their intended application. The fact that the ultimate morphology of a blown film develops over a short region near the process frost line is also well-known. In addition, the final semi-crystalline morphology that develops is very likely to be dependent on the state of the macromolecules prior to the onset of crystallization. The state of the molecules prior to and during the crystallization process, in turn, is dependent on the influence exerted by the process stress profiles in orienting the macromolecules and, subsequently, either preserving or relaxing their extended state. This chapter identifies possible morphological features that drive the performance of polyethylene blown films, specifically the MD tear strength. For several blown films made from a linear low-density polyethylene type material (LDLPE) having broad molecular weight distribution, this chapter clearly shows that the MD tear performance was favored by low process MD extension rates and short polymer melt relaxation times. The relative magnitude of the polymer relaxation time and process time is also shown to be important, with low Deborah numbers favoring better MD tear performance. The orientation of the non-crystalline chain segments in these blown films appears to suggest that interlamellar shear plays an important role in determining the MD tear performance of LDLPE and LLDPE blown films." @default.
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- W980006678 date "1999-01-01" @default.
- W980006678 modified "2023-09-23" @default.
- W980006678 title "The Relative Influences of Process and Resin Time-Scales on the MD Tear Strength of Polyethylene Blown Films" @default.
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- W980006678 doi "https://doi.org/10.1016/b978-188420776-1.50017-x" @default.
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