Rheology of Miscible Polymer Blends with Hydrogen Bonding

Abstract

Poly(4-vinylphenol) (PVPh) was blended with four different polymers: poly(vinyl methyl ether) (PVME), poly(vinyl acetate) (PVAc), poly(2-vinylpyridine) (P2VP), and poly(4-vinylpyridine) (P4VP) by solvent casting. The miscibility of these four PVPhbased blend systems was investigated using differential scanning calorimetry (DSC) and the composition-dependent glass transition temperature (T g) was predicted by a thermodynamic theory. The hydrogen bonds between phenolic group in PVPh and ether group, carbonyl group or pyridine group was confirmed by Fourier transform infrared (FTIR) spectroscopy. The fraction of hydrogen bonds was calculated by the Coleman-Graf-Painter association model. Linear dynamic viscoelasticity of four PVPh-based miscible polymer blends with hydrogen bonding was investigated. Emphasis was placed on investigating how the linear dynamic viscoelasticity of miscible polymer blends with specific interaction might be different from that of miscible polymer blends without specific interaction. We have found that an application of time-temperature superposition (TTS) to the PVPh-based miscible blends with intermolecular hydrogen bonding is warranted even when the difference in the component glass transition temperatures is as large as about 200 °C, while TTS fails for miscible polymer blends without specific interactions. On the basis of such an observation, we have concluded that hydrogen bonding suppressed concentration fluctuations in PVPh-based miscible blends. It has been found that both the intra-association (self-association

Synthesis of hydrogenated functional polynorbornene (HFPNB) and rheology of HFPNB-based miscible blends with hydrogen bonding

“…9-12), in spite of the fact that DT g is 91 C for the PC/HPNBCOOH blends and DT g is 36 C for the P2VP/ HPNBCOOH blends. On the basis of our previous study [36], we conclude that hydrogen bonding suppressed concentration fluctuations and dynamic heterogeneity in PC/HPNBCOOH and P2VP/ HPNBCOOH blends, warranting the application of TTS to both blend systems.…”

“…Earlier, negative deviation from linearity in the plots of T g versus blend composition was also observed for miscible blends of poly(N-vinylpyrrolidone) and poly[ethylene-co-(acrylic acid)] forming hydrogen bonds [33] and for miscible blends of poly(vinylphenol) and poly(L-lactide) forming hydrogen bonds [34]. It was suggested [35,36] that negative deviation from linearity in the plot of T g versus blend composition indicates that the strength of attractive interactions between the constituent components of miscible polymer blends is not strong. Fig.…”

Molecular insights into the damping mechanism of poly(vinyl acetate)/hindered phenol hybrids by a combination of experiment and molecular dynamics simulation

“…Moreover, neither the melting peak nor glass transition peak of AO-70 was observed in the hybrids, indicating that AO-70 was miscible with PVAc in all hybrids. Table 3 gives a summary of the Tg in terms of Tgm and the width of Tg denoted by ∆W Tg =Tgf-Tgi for PVAO hybrids, where Tgi, Tgm, Tgf represent the onset, middle and end point of the glass transition region and the value of ∆W Tg is related to the extent of composition fluctuations and dynamic heterogeneity in miscible blends [38].…”

Amorphous Polymer Blends: Recent Developments

“…For additional historical reviews related to amorphous polymer blends published at the time of this writing, the reader is directed to References [3][4][5][6][7][8][9][10][11][12][13][14][15]. The current chapter will primarily focus on mixtures that form intimately mixed or miscible blends, since the behavior of individual components are most interesting in such systems, and, more importantly, miscible blends can represent completely new materials relative to their constituents.…”