Enhanced foaming ability of thermoplastic polyurethane by crystallization during mold-opening foam injection molding with supercritical N2 as blowing agents
This study provides an insight into the foaming of thermoplastic polyurethane (TPU), which was improved by the crystallization of hard segment domains. This study investigated the effects of packing time in the mold-opening foam injection molding (MOFIM) technology on the crystallization behavior of...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-01-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422020063 |
| _version_ | 1828054069320613888 |
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| author | Sai Wang Haoyang Feng Jianming Hong Guilong Wang |
| author_facet | Sai Wang Haoyang Feng Jianming Hong Guilong Wang |
| author_sort | Sai Wang |
| collection | DOAJ |
| description | This study provides an insight into the foaming of thermoplastic polyurethane (TPU), which was improved by the crystallization of hard segment domains. This study investigated the effects of packing time in the mold-opening foam injection molding (MOFIM) technology on the crystallization behavior of hard segments in TPU and the cell morphology of TPU foams. It was observed that the prolongation of the packing time, corresponding to a longer crystallization time before foaming, induced an increased crystallinity in the injection-molded TPU solids and foams due to the crystals becoming more close-packed. The enhancement of the foamability of TPU was attributed not only to the increased crystallinity of hard segments, but also to the broader distribution of crystals at the same crystallinity. Furthermore, TPU foams with greater hardness have smaller cell size, higher cell density, and narrower distribution in cell size owing to their higher viscosity and storage modulus than those with lower hardness prepared under the same conditions. |
| first_indexed | 2024-04-10T20:17:14Z |
| format | Article |
| id | doaj.art-aba7ea2346c645fbaf7d8a98d6c78323 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-10T20:17:14Z |
| publishDate | 2023-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-aba7ea2346c645fbaf7d8a98d6c783232023-01-26T04:46:31ZengElsevierJournal of Materials Research and Technology2238-78542023-01-012224892501Enhanced foaming ability of thermoplastic polyurethane by crystallization during mold-opening foam injection molding with supercritical N2 as blowing agentsSai Wang0Haoyang Feng1Jianming Hong2Guilong Wang3School of Mechatronic Engineering, Shenzhen Polytechnic, Shenzhen, Guangdong 518055, China; Corresponding author.School of Mechatronic Engineering, Shenzhen Polytechnic, Shenzhen, Guangdong 518055, ChinaSchool of Mechatronic Engineering, Shenzhen Polytechnic, Shenzhen, Guangdong 518055, ChinaKey Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, Shandong 250061, China; Corresponding author.This study provides an insight into the foaming of thermoplastic polyurethane (TPU), which was improved by the crystallization of hard segment domains. This study investigated the effects of packing time in the mold-opening foam injection molding (MOFIM) technology on the crystallization behavior of hard segments in TPU and the cell morphology of TPU foams. It was observed that the prolongation of the packing time, corresponding to a longer crystallization time before foaming, induced an increased crystallinity in the injection-molded TPU solids and foams due to the crystals becoming more close-packed. The enhancement of the foamability of TPU was attributed not only to the increased crystallinity of hard segments, but also to the broader distribution of crystals at the same crystallinity. Furthermore, TPU foams with greater hardness have smaller cell size, higher cell density, and narrower distribution in cell size owing to their higher viscosity and storage modulus than those with lower hardness prepared under the same conditions.http://www.sciencedirect.com/science/article/pii/S2238785422020063TPU foamMold-opening foam injection moldingCrystallization effectSupercritical nitrogen |
| spellingShingle | Sai Wang Haoyang Feng Jianming Hong Guilong Wang Enhanced foaming ability of thermoplastic polyurethane by crystallization during mold-opening foam injection molding with supercritical N2 as blowing agents Journal of Materials Research and Technology TPU foam Mold-opening foam injection molding Crystallization effect Supercritical nitrogen |
| title | Enhanced foaming ability of thermoplastic polyurethane by crystallization during mold-opening foam injection molding with supercritical N2 as blowing agents |
| title_full | Enhanced foaming ability of thermoplastic polyurethane by crystallization during mold-opening foam injection molding with supercritical N2 as blowing agents |
| title_fullStr | Enhanced foaming ability of thermoplastic polyurethane by crystallization during mold-opening foam injection molding with supercritical N2 as blowing agents |
| title_full_unstemmed | Enhanced foaming ability of thermoplastic polyurethane by crystallization during mold-opening foam injection molding with supercritical N2 as blowing agents |
| title_short | Enhanced foaming ability of thermoplastic polyurethane by crystallization during mold-opening foam injection molding with supercritical N2 as blowing agents |
| title_sort | enhanced foaming ability of thermoplastic polyurethane by crystallization during mold opening foam injection molding with supercritical n2 as blowing agents |
| topic | TPU foam Mold-opening foam injection molding Crystallization effect Supercritical nitrogen |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422020063 |
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