Preparation and Evaluation of Methytrifluoropropyl-Containing Vinyl-Functionalized Terpolysiloxanes for “All-in-One” Pastes for Additive Manufacturing
Date of Award
Master of Science (MS)
Dr. Petar Dvornic
Dr. Santimukul Santra
Dr. Khamis Siam
In this work, the effects of the degree of polymerization (DP) and incorporation (mol %) of methytrifluoropropylsiloxy (MeTfpS) repeat units into vinyl-functionalized terpolysiloxanes in crosslinked elastomers from “All-in-One” pastes (A/1Ps) for additive manufacturing were investigated. It was found that the DP and mol % of MeTfpS-containing repeat units do not contribute to the rheological properties of non-crosslinkable pastes, which can be mostly attributed to the thixotropic additive and both the type and relative amount of filler added. Crosslinkable A-1/Ps with higher DP polymers exhibited faster curing (crosslinking) while the mol % of MeTfpS had little to no effect on the curing times. A/1Ps underwent a year-long shelf-life stability study indicating only a slight loss in storage modulus for pastes using MeTfpS-containing terpolymers with targeted DPs of 160 and 240 after six months. The crosslinked elastomers exhibited strain-induced crystallization (via DMA) only in elastomer samples containing 5 mol % of MeTfpS and with a DP of 240 or higher in the temperature range of -80 to -30 °C, characteristic for pure polydimethylsiloxane (PDMS) melting transition.
Satterfield, Hunter, "Preparation and Evaluation of Methytrifluoropropyl-Containing Vinyl-Functionalized Terpolysiloxanes for “All-in-One” Pastes for Additive Manufacturing" (2022). Electronic Theses & Dissertations. 395.