AbstractOrganic solvent–insoluble portions included in the varying type of ethylene–propylene–diene terpolymers (EPDM) were analyzed by the solubility test, differential scanning calorimetry, x‐ray diffraction, infrared spectrometry and the electron microscope. It was found that insoluble portions are resolved into microcrystalline gel owing to association of the long ethylene linkage and the crosslinking gel based on the presence of the third component by the variety of EPDM. The differences in the analytical results of the microcrystalline gel was ascribed to the differences in the monomer sequence distribution along the polyme
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