Title:
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Influence of the injection-molding parameters on the cellular structure and thermo-mechanical properties of ethylene-propylene block copolymer foams
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Author:
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Gómez Gómez, Jaime Francisco; Arencón Osuna, David; Sánchez Soto, Miguel; Martínez Benasat, Antonio
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. POLYCOM - Polimers i compòsits: tecnologia |
Abstract:
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Microcellular injection-molding technology is capable of
producing lightweight polymeric products. The foam morphology is determined
by the injection-molding parameters, and it has been observed that depending on
the parameter variations, the cell structure may exhibit substantial morphological
differences through the entire section along the melt flow direction of the injected part. The effects of varying injection-molding parameters on foam morphology
and thermal mechanical properties of a multiphase ethylene-propylene block
copolymer (EPBC) were tested on 5-mm plaque specimens using a constant
temperature profile. It has been found that injection speed does not have a
significant effect on the thermal-mechanical properties of the foam, whereas shot
volume and mold temperature do have a significant influence. Low shot volume
produces uniform density cellular structures and larger cores, whereas lower
mold temperatures help maintain small cell sizes. Furthermore, the effect of the
copolymer’s crystalline phase on foam morphology has been observed. This
study identifies the achievable foam morphologies and the thermal-mechanical
performance of cellular molded EPBC parts. |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers -Copolymers--Analysis -Copolímers de bloc -Assaigs de materials -- Propietats mecàniques |
Rights:
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Document type:
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Article - Published version Article |
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