Development of High Impact, High MFR and Lightweight Polypropylene for Automotive Interiors Application

Chanana, Sunit Kumar; Kapila, Arpit; Haldar, Sanjay; Joshi, Naman; Dave, Dinesh N

doi:10.4271/2014-01-1039

Cited by 2 publications

(1 citation statement)

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“…Isotactic polypropylene is one of the most used polymers in transportation due to its low density, which allows for the production of lightweight materials [5,6]. The possibility to control the properties of isotactic polypropylene (iPP) parts in the injection molding process can be a way to reduce the environmental impact of plastic.…”

Section: Introductionmentioning

confidence: 99%

Morphology Distribution in Injection Molded Parts

Liparoti,

Salomone,

Speranza

et al. 2024

Polymers

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A more sustainable use of plastic parts makes it necessary to replace current plastic parts with recyclable components, also allowing the modulation of the part properties through the process. Injection molding is one of the most widely used technologies for obtaining rigid plastic parts, so it is crucial to understand how to tailor properties by adopting the correct processing conditions. One way is to perform annealing steps directly inside the mold: in-mold annealing improves the structural integrity and durability of the material, reduces defects, increases the resistance of parts against certain chemicals, reduces wear and tear, increases ductility, and lowers brittleness. In this work, several in-mold annealing steps were conducted, changing the mold temperature and annealing duration selected on the basis of the half crystallization time of the adopted isotactic polypropylene. The typical molded part morphology, composed of oriented layers at the surface, transition zones, and spherulitic core, is strongly affected by in-mold annealing. In particular, the thickness of the oriented layer, which forms in the early phase of the process, decreases, and the spherulites increase in size. Concerning mechanical behavior, the orientation degree mostly determines the elastic modulus value close to the surface, whereas the conditions under which crystallization occurs determine the modulus in the core.

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Section: Introductionmentioning

confidence: 99%