The high temperature secondary crystallisation of aged isotactic polypropylene
نویسندگان
چکیده
منابع مشابه
High-pressure crystallization of isotactic polypropylene droplets
Dispersions of isotactic polypropylene (PP) particles in polystyrene (PS) were produced by interfacially driven breakup of nanolayers in multilayered systems that were fabricated by means of layer-multiplying coextrusion. The droplet size was controlled by the individual PP layer thickness ranging from 12 to 200 nm. In addition, PP was melt blended with PS to produce PP droplets larger than tho...
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The crystallization characteristics of the !-, "-and #-phases of isotactic polypropylene were studied for welldefined and fully characterized polymers with varying amounts of stereoand regio-defects. The specimens enabled us to study separately the influence of the type of chain defect and the concentration of defects on the parameters of interest. A combined defect fraction (CDF) was introduce...
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A filament stretching extensional rheometer with a custom-built oven was used to investigate the effect of uniaxial flow on the crystallization of polypropylene. Prior to stretching, samples were heated to a temperature well above the melt temperature to erase their thermal and mechanical histories and the Janeschitz-Kriegl protocol was applied. The samples were stretched at extension rates in ...
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Bulk isotactic polypropylene in the a form was studied using density functional theory-based computations. The computed physical structure of this system is in excellent agreement with available experimental data. The electronic band structure, ionization potential, and electron affinity were also determined. The impact of various types of chemical imperfections (including double bond, hydroxyl...
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BOITOUT, Hugo, "Influence of the temperature on flow-induced crystallization of isotactic polypropylene and propylene-ethylene random copolymer" (2014). Influence of the temperature on flow-induced crystallization of isotactic polypropylene and propylene-ethylene random copolymer Influence of the temperature on flow-induced crystallization of isotactic polypropylene and propylene-ethylene rando...
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ژورنال
عنوان ژورنال: Polymer Testing
سال: 2004
ISSN: 0142-9418
DOI: 10.1016/j.polymertesting.2004.01.015