Abstract
In this study, we investigated the influence of methacryl-functionalized polyhedral oligomeric silsesquioxane (MA-POSS) nanoparticles as a plasticizer and thermal stabilizer for a poly(vinyl chloride) (PVC) homopolymer and for a poly(vinyl chloride)/dissononyl cyclohexane-1,2-dicarboxylate (PVC/DINCH) binary blend system. The PVC and the PVC/DINCH blend both became flexible, with decreases in their glass transition temperatures and increases in their thermal decomposition temperatures, upon an increase in MA-POSS content, the result of hydrogen bonding between the C=O groups of MA-POSS and the H–CCl units of the PVC, as determined using infrared spectroscopy. Furthermore, the first thermal decomposition temperature of the pure PVC, due to the emission of HCl, increased from 290 to 306 °C, that is, the MA-POSS nanoparticles had a retarding effect on the decomposition of the PVC matrix. In tensile tests, all the PVC/DINCH/MA-POSS ternary blends were transparent and displayed flexibility, but their modulus and tensile strength both decreased, while their elongation properties increased, upon an increase in MA-POSS concentration, both before and after thermal annealing. In contrast, the elongation decreased, but the modulus and tensile strength increased, after thermal annealing at 100 °C for 7 days.
Highlights
Poly(vinyl chloride) (PVC) is one of the most commonly employed polymeric materials
Polyhedral oligomeric silsesquioxane (POSS) derivatives are organic/inorganic hybrid materials that have been widely dispersed in polymeric matrices by taking advantage of both chemical and physical bonding interactions [11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]
The resulting blend the polymer mixture was stirred for 24 h and the solution was poured into a Teflon mold
Summary
Poly(vinyl chloride) (PVC) is one of the most commonly employed polymeric materials. It is used widely in packing materials, toys, healthcare, electric insulation, automobiles, and interior decorations, because of its high transparency, inertness, and reasonable mechanical properties [1,2,3,4,5]. Various nanofillers have been tested as plasticizers to enhance the thermal stability of PVC [8,9,10] These nanofillers would function as plasticizers, while inhibiting the degradation of the polymer and the release of HCl. Polyhedral oligomeric silsesquioxane (POSS) derivatives are organic/inorganic hybrid materials that have been widely dispersed in polymeric matrices by taking advantage of both chemical and physical bonding interactions [11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]. We have employed differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and tensile tests to characterize the glass transition and thermal decomposition temperatures, hydrogen bonding interactions, and mechanical properties of binary blends of PVC/MA-POSS and ternary blends of PVC/DINCH/MA-POSS
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