Glass Transition Behaviors of Poly (Vinyl Pyridine)/Poly (Vinyl Phenol) Revisited

Abstract

We examined the composition and molecular weight dependence of the glass transition temperature in detail for two types of hydrogen bonding miscible blends: poly (2-vinyl pyridine)/poly (vinyl phenol) (2VPy/VPh) and poly (4-vinyl pyridine)/poly (vinyl phenol) (4VPy/VPh). Regarding the functional form of the glass transition temperature, Tg, as a function of the weight fraction, we found a weak deviation from the Kwei equation for 2VPy/VPh blends. In contrast, such a deviation was not observed for the 4VPy/VPh blend. By relating the difference in the functional forms of Tg between the two blend systems to the difference in hydrogen bonding ability, we proposed a modified version of the Kwei equation. As for the interaction parameter, q in the Kwei equation, clear molecular weight dependence was observed for 2VPy/VPh blends: the lower the VPh molecular weight in the oligomer level, the higher the q values, suggesting the higher hydrogen bonding formability near the polymer chain ends than the middle part of a polymer chain.

Drug Delivery System Based on pH-Sensitive Biocompatible Poly(2-vinyl pyridine)-b-poly(ethylene oxide) Nanomicelles Loaded with Curcumin and 5-Fluorouracil

“…This effect was also observed by Li et al [ 37 ] for the release of 5-FU from nanoparticles based on poly(ethylene glycol)-b-poly(benzyl-L-glutamate) (PEG-b-PBLG). At this point it is also important to notice that 5-FU can form hydrogen bonds with the nitrogen of the P2VP groups [ 38 , 39 ]. Although it is not very pronounced, for all the analyzed samples, a less intense “burst effect” was observed in Figure 2 .…”

Poly(vinyl pyridine) and Its Quaternized Derivatives: Understanding Their Solvation and Solid State Properties

“…Poly(4-vinylpyridine) (PVP) is a linear polymer with pendant pyridine groups that can be used in a variety of applications, such as surface modification, by immobilizing atoms or particles, electrochemical sensors [ 20 ], fabrication of antibacterial surfaces, development of pH sensitive systems, 3D molecular level ordering systems, anti-corrosive coatings and even dye sensitized solar cells (DSSCs) and light-emitting diodes [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. Positively charged polypyridines constitute a unique class of compounds in which quaternization enables the introduction of permanent positive charges into the backbone, resulting in electron delocalization phenomena that are attributed to the existence of electron-rich pyridines and electron-poor pyridiniums [ 30 , 31 , 32 , 33 ].…”

Rheological Behavior of Hydrogen Bonding Miscible Blend: High Molecular Weight Poly(2-vinyl pyridine) and Low Molecular Weight Poly(4-vinyl phenol)

“…Therefore, we determined the weight fractions of 2VPy (w VPy ) for the finally dried samples by the elemental analysis with the equipment of MT-6 (YANACO, Japan). The details of the blend sample preparation were reported previously 32) .…”

“…The applied strains were confirmed to be small enough to be within the linear response regime for all the measurements. previously 32) , the w 2VPy dependence of T g can be represented by the following modified Kwei equation using the component T g values, T g,2VPy and T g,VPh .…”

“…Here, w VPh = 1 -w 2VPy, and k, q, and α are the parameters: (k, q, α) = (1.28, 158 ºC, 1.17) for 2VP40/VPh5 and (1.35, 186 ºC, 1.18) for 2VP40/VPh2 blends 32) . Regarding the VPh component, their T g are different depending on the molecular weight: T g,VPh = 145.5 ºC (for VPh5) and 99.5 ºC (for VPh2).…”