Abstract
The newest observation disclosed the clear image of macroscopic inhomogeneous structures of cross-linked rubbers. Cross-linking agent, sulfur disperses as a bulky ZnS in rubber matrix quite inhomogeneously, which generates the heterogeneous phase separation of cross-linked (about 30%) and uncross-linked (about 70%) phases during vulcanization. The mechanically fundamental units of the cross-linked and the uncross-linked phase are 1~2 μm and a few hundred nm, respectively. The soft uncross-linked phase surrounding the hard cross-linked phase mainly extends in external extension and swelling, thus the system deforms ununiformly, i.e. non-affinly. The above observation seems to support the models proposed by the author.
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