| Study on Structures and Properties of EPDM J-4090 and 6950C |
| Received:December 13, 2021 Revised:December 13, 2021 |
| DOI：10.12136/j.issn.1000-890X.2023.04.0272 |
| Key Words: EPDM；sponge sealing strip；dense compound；foamed compound；microstructure；physical property；foaming characteristic；extrusion swell ratio |
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| Abstract: |
| The microstructures of two brands of EPDM（J-4090 and 6950C） used in automobile sponge
sealing strips and the properties of their composites（including dense compound and foamed compound）
were studied. The results showed that，compared with EPDM 6950C，EPDM J-4090 had larger vinyl mass
fraction，smaller mass fraction of the third monomer（ethylidene norbornene） and wider molecular weight
distribution. Compared with EPDM 6950C dense compound，EPDM J-4090 dense compound had lower
vulcanization rate and crosslinking density，and poor resistance to deformation. However，when the amount
of the vulcanization system in EPDM J-4090 dense compound increased by 20%，its physical properties
could reach the same level as that of EPDM 6950C dense compound. Compared with EPDM 6950C foamed
compound，the extrusion swell ratio of the EPDM J-4090 foamed compound with 20% increase in the amount
of the vulcanization system was slightly larger，and the foaming characteristics and physical properties were
similar. |
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