Experiments were performed on a Bruker minispec mq20 (Germany) benchtop spectrometer having a magnetic field strength of approximately 0.5 T which corresponds to a resonance frequency of 19.95 MHz. Small discs were punched from the weathered specimens and stacked in a 10 mm NMR tube up to a height of 6 mm. A Bruker BVT 3000 temperature controller was used to maintain a constant measurement temperature of 80±0.1 °C. The 90° pulse length and receiver dead-time corresponded to 2.6 µs of 11 µs, respectively. The recycle delay (5T1) for the pristine, unexposed, and weathered samples was determined to be about 0.6 s for NR and 0.2 s for SBR.