Evaluation of the Fusion Quality of Bead Foams Made from Polybutylene Terephthalate (E?PBT) Depending on the Processing Temperature
نویسندگان
چکیده
Increasing requirements are leading to new developments in bead foam materials. Engineering thermoplastics such as polybutylene terephthalate (PBT) outperform standard foams thermal stability. In order obtain molded parts, beads fused together using steam chest molding. Classical theories for the fusion mechanism, explaining molding of amorphous EPS (expandable polystyrene) or semi-crystalline EPP (expanded polypropylene), cannot be applied E-PBT terephthalate). previous studies, sufficient time polymer interdiffusion during is identified crucial and requires adjusted crystallization kinetics. This study consequently examines which extent crystalline properties behavior can influenced by foaming process. By varying underwater granulation (UWG) water temperature, different cooling rates expanding melt generated. The foamed show cell morphologies, dynamic mechanical depending on UWG temperature. Those that a pronounced shrinkage thermomechanical analysis, caused an increased open content cold-crystallization, exhibit reduced quality. quality examined fracture surface. phenomenon causes contact partially separation between beads.
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ژورنال
عنوان ژورنال: Macromolecular Materials and Engineering
سال: 2022
ISSN: ['1439-2054', '1438-7492']
DOI: https://doi.org/10.1002/mame.202200419