期刊
POLYMER
卷 228, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2021.123872
关键词
TPU bead Foam; Autoclave foaming; Inter-bead bonding
资金
- National Natural Science Foundation of China [51873226]
- Science and Technology Development Project of Jilin Province, China [20200201239JC]
- Fundamental Research Funds for the Central Universities [20lgzd02]
- Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [2019-10]
- Natural Science Foundation of Fujian Province of China for Distinguished Young Scholars [2019J06025]
This study introduced critical parameters including softening temperature and viscous flow temperature to explain the autoclave foaming of thermoplastic polyurethane and the inter-bead bonding mechanism of expanded TPU beads. The evolution of ordered structure of TPU in high-elastic state was characterized by different methods, showing possible mechanisms of strong inter-bead bonding in the molded ETPU parts.
Different from the melt foaming of extrusion and injection molding, polymer is in high-elastic state during autoclave foaming. In this study, the critical parameters used to describe the high-elastic state of polymer, i.e., softening temperature (Ts) and viscous flow temperature (Tv), were introduced to explain the autoclave foaming of thermoplastic polyurethane (TPU) and the inter-bead bonding mechanism of expanded TPU (ETPU) beads. Evolution of ordered structure of TPU in high-elastic state was characterized by different methods. The steamchest molding was used to manufacture the ETPU parts, and the molding temperature window was compared with the Ts and Tv of TPU resin, and the endothermic peaks of ETPU beads. The melting of ordered hard segments structure, interface-diffusion of polymer chains, cooling-induced formation of new ordered structure among the diffused polymer chains were the possible mechanism of strong inter-bead bonding in the molded ETPU parts.
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