Abstract
In this study we used anionic living polymerization to prepare two different homopolymers: a poly(methyl methacrylate) (PMMA) and a PMMA derivative presenting polyhedral oligomeric silsesquioxane (PMA-POSS) units as its side chains. We then employed differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, and wide-angle X-ray diffraction (WAXD) to investigate the miscibility and specific interactions of PMMA and PMA-POSS with three hydrogen bonding donor compounds: poly(vinyl phenol) (PVPh), phenolic resin, and bisphenol A (BPA). DSC revealed that all of the PVPh/PMMA, phenolic/PMMA, and BPA/PMMA blends exhibited a single glass transition temperature, characteristic of miscible systems; FTIR spectroscopic analyses revealed that such miscibility resulted from hydrogen bonding interactions between the C=O groups of PMMA and the OH groups of these three hydrogen bonding donor compounds. In contrast, all of the PVPh/PMA-POSS, phenolic/PMA-POSS, and BPA/PMA-POSS blends were immiscible: DSC revealed two glass transition temperatures arising from strong screening effects (FTIR spectroscopy) and high degrees of aggregation (WAXD) of the POSS nanoparticles. We propose that the value of the intramolecular screening effect (γ) should be very close to 1 for all PMA-POSS blend systems when POSS nanoparticles appear as the side chains of PMMA, such that the OH groups of the hydrogen bonding donor compounds cannot interact with the C=O groups of PMA-POSS.
Highlights
Polymer blending can be a powerful route toward materials exhibiting properties and cost performances superior to those of their individual components
We have prepared a series of blends of poly(methyl methacrylate) (PMMA) and PMA-polyhedral oligomeric silsesquioxane (POSS) with poly(vinyl phenol) (PVPh), phenolic resin, and bisphenol A (BPA) and investigated their properties using differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, and wide-angle X-ray diffraction (WAXD)
All of these blends of PMMA with PVPh, phenolic, and BPA were totally miscible in the amorphous phase over their entire compositions, as evidenced by a single glass transition temperature (DSC) and intermolecular hydrogen bonding interactions (FTIR spectroscopy) between the C=O groups of PMMA and the OH
Summary
Polymer blending can be a powerful route toward materials exhibiting properties and cost performances superior to those of their individual components. When POSS moieties are located only at the chain ends of PMMA polymers, the amount of POSS in a sample would be extremely low and the screening effect should be minimal In this present study we wished to investigate the effect of grafting POSS nanoparticles to the side chains of PMMA (forming so-called “PMA-POSS”) on the miscibility behavior and hydrogen bonding interactions of PVPh/PMA-POSS, phenolic/PMA-POSS, and bisphenol A (BPA)/PMA-POSS blends. We blended PMMA and PMA-POSS individually with PVPh, phenolic resin, and BPA, with a particular interest in determining whether the POSS side chains would affect the thermal properties, miscibility behavior, and hydrogen bonding interactions of these binary blends
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