Abstract
The mechanism of bond ordering in high-pressure ${\mathrm{C}}_{60}$ polymerization was clarified by following the polymerization process through in situ synchrotron angular-dispersive diffraction. The bonding directions correspond to the maximum applied stress directions and are therefore selected by stress. The bond-selecting stress field prevents the isotropic propagation of the polymerization in three-dimensional space, which would give a disordered frustrated structure as in photopolymerization, and leads to an ordered arrangement of polymerized molecules that causes a symmetry reduction.
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