Synthesis and characterization of thiol–ene functionalized siloxanes and evaluation of their crosslinked network properties

 Journal of Polymer Science Part A: Polymer Chemistry

http://onlinelibrary.wiley.com/doi/10.1002/pola.26245/abstract

Three types of linear thiol-functionalized siloxane oligomers and three types of ene-functionalized oligomers were synthesized and subsequently photopolymerized. Within each type of thiol-functionalized oligomer, the ratio of mercaptan repeat units to nonreactive phenyl repeat units was varied to manipulate both the crosslink density and the degree of secondary interactions through π–π stacking.
Networks with a high concentration of thiol functionalities exhibit higher rubbery moduli, ultimate strengths, and Young's moduli than networks with lower thiol concentrations.