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(A) Photographs of the swelling behavior of NR–SiO2 composites in toluene at specific time intervals: (a) NR, (b) NR/75S-T, (c) NR/50S-T, (d) NR/25S-T, (e) NR/50S-0T, (f) NR/50S-RT, and (g) DNR/50S-T. (B) Comparison of bound rubber contents in NR–SiO2 composites.
