A) Monomers and fillers used in the formulation of the composites to examine the influence of combining RAFT resin with TTE at the SNP-polymer interface. B) Final polymerization shrinkage stress taken after 5 min reaction time at equivalent 100% conversion, as a function of the double bond conversion via tensometer in thiol-ene composites: No DCC: non-AFT resin/thioester SNPs, no catalyst; Interfacial TTE: non-AFT resin/thioester SNPs, with DABCO added; Resin based AFT only: AFT resin/thioester SNPs, no catalyst; Both DCCs: AFT resin/thioester SNP, DABCO added. Each composition contained 10 wt.% SNPs, 1 wt.% IR819, and was irradiated with 50 mW/cm2 light intensity of 400-500 nm. Two mixtures contained DABCO (1 wt.%).