Page 57 - 《橡塑技术与装备》英文版2025年12月

MATERIALS AND FORMULATIONS

The fracture of the main chain and cross-linking bonds
during the de-crosslinking process was analyzed, and the
curve fitting of Horikx for CR and DCR is shown in Figure
1. The dashed line represents the fracture of cross-linking
bonds, while the solid line represents the fracture of chemical
bonds in the main chain. That is, the closer to the dashed
line, the more likely there is a tendency towards S-S and C-S
fracture, and the closer to the solid line, the more likely there
is a tendency towards C-C fracture in the main chain. It can
be observed that both excessively high temperature (sample
DCRT180R80H10) and high desulfurization agent content Figure 1 Horikx curve of CR and DCR
(sample DCRT160R80H30) can lead to significant fracture of
the main chain, with temperature having the greatest impact. 2.2 Microscopic morphology of DCR
DCRT160R40H10 and DCRT140R80H10 are close to the As shown in Figure 2(a), the apparent morphology of CR
dashed line, indicating mainly fracture of cross-linking bonds. is characterized by particles that are separated from each other
As the desulfurization temperature, rotational speed, and without bonding, presenting a granular appearance. This is due
desulfurization agent content increase, the sol content increases to the interconnected network structure of the rubber powder,
and the cross-linking density decreases. which leads to a compact structure and low bonding energy,
resulting in a granular distribution of CR. The remaining

Figure 2 SEM Microscopic Morphology of CR and DCR: (a) CR, (b) DCRT140R80H10, (c) DCRT160R40H10, (d)
DCRT160R60H10, (e) DCRT160R80H10, (f) DCRT180R80H10, (g) DCRT160R80H20, (h) DCRT160R80H30

Vol.51，2025 ·51·