Study on spherulite anisotropy in semicrystalline polymers: quantifying mechanical properties and deformation mechanisms

Jiang, Chenxu; Zhang, Jia; Cui, Jiaxin; Miao, Changqing

doi:10.1007/s10853-023-08716-9

Cited by 2 publications

(1 citation statement)

References 51 publications

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“…In the core, the elastic modulus increases when the annealing is performed. The literature proved that the dimension of spherulites affects the elastic modulus: the larger the spherulite dimension, the higher the modulus [32]. Furthermore, the central part of the spherulite shows a higher modulus, due most likely to the fine and complex microstructure.…”

Section: Resultsmentioning

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: Resultsmentioning

confidence: 99%