Efficient internal plasticization of poly(vinyl chloride) via free radical copolymerization of vinyl chloride with an acrylate bearing a triazole phthalate mimic

摘要

Nonmigratory internal plasticization of poly(vinyl chloride) (PVC) is achieved by synthesis of poly(vinyl chloride)-co-poly(4,5-bis(2-ethylhexyl)-1-[6-prop-2-enoyloxy)hexyl]-1H-1,2,3-triazole-4,5-dicarboxylate) [PVC-co-P (DEHT-HA)] copolymers via free radical polymerization (FRP). Optimization of the polymerization temperature, solvent, initiator, and vinyl chloride/acrylate (VC/DEHT-HA) monomer ratio were systematically investigated, and the corresponding glass transition temperatures (T-g) of the resultant copolymers determined. These internally plasticized copolymers were characterized by H-1 NMR, FTIR, SEC and DMTA. The T-g values of the PVC-co-P (DEHT-HA) copolymers range from -27 to 78 degrees C, and the physical properties suggest that the P(DEHT-HA) and PVC segments are miscible. Thermogravimetric analysis shows that increasing the ratio of the monomer DEHT-HA to VC increases the thermal stability. By varying the initial VC/DEHT-HA monomer ratio, one can tune the T-g of the resulting copolymer, making both the strategy and the polymer flexible.