Fundamental Influences of Crosslinking Structure on the Cell Morphology, Creep Property, Thermal Property, and Recycling Behavior of Microcellular EPDM Foams Blown with Compressed CO2.
writer：Hao Zheng, Ge Pan, Pengke Huang, Donghua Xu,* and Wentao Zhai*.
keywords：///
source：期刊
specific source：Ind. Eng. Chem. Res. 2020, 59, 1534?1548.
Issue time：2020年
In this study, the crosslinked ethylene?propylene?
diene monomer (EPDM) foams were prepared by batch foaming
using compressed CO2 as the blowing agent. The various
crosslinking structures, i.e., the local primary crosslinking structure,
the micro-crosslinking structure, and the full crosslinking structure,
were generated by adjusting the loading of the crosslinking agent.
The models were established to illustrate the fundamental
influences of crosslinking structures on the evolution of cell
morphology. EPDM-0.2B with 0.2 parts per hundred of rubber
(phr) loading of the crosslinking agent had the micro-crosslinking
structure, which improved the foamability of EPDM significantly.
The foaming temperature window was broadened from 40?80 to
100?200 °C, and the expansion ratio was increased from 5.6 to 7.1
compared with pure EPDM. Meanwhile, the structure endows the EPDM-0.2B foam with improved creep resistance, increased
thermal stability, and a melt-recycling ability. The EPDM foam with the full crosslinking structure exhibited better creep resistance
and thermal stability, but the structure spoiled its melt-recycling ability significantly.