X-ray total scattering data were collected at beamline I15-1, Diamond Light Source, UK (EE200338) on pristine glass, pristine ZIF-8, composites and physical mixtures. All samples were ground and loaded into borosilicate glass capillaries (0.78 mm inner diameter) to a height of 3.6 cm. The capillaries were sealed with plasticine before being mounted onto the beamline. Total scattering data were collected at room temperature for the background (i.e. empty instrument), empty borosilicate capillary and for all samples in a Q range of 0.2 -26.0 Å -1 (λ = 0.189578 Å, 65.40 keV). The total scattering data were processed to account for absorption corrections and various scattering corrections including background scattering, multiple scattering, container scattering and Compton scattering, in a Q range of 0.35 -20.0 Å -1 . Applied densities were obtained from the Helium pycnometer measurements. Subsequent Fourier transformation of the processed total scattering data resulted in a real space pair distribution function G(r) for each material. In this work we use the D(r) form of the Pair Distribution Function to accentuate high r correlations. All processing of the total scattering data was performed using GudRunX following well documented procedures. Fourier transform infra-red spectroscopy (FTIR). IR spectra were collected on powder samples using a Bruker Tensor 27 FTIR spectrometer in transmission mode between 550 and 4000 cm -1 . A background was subtracted from all spectra prior to analysis.