Phase structure and dynamics of polystyrene/poly(vinyl methyl ether) blend studied using solid-state NMR

Peng, Yong-jin; Liu, Yuling; Hao, Junhua; Zhang, Rongchun; Sun, Pingchuan

doi:10.1039/c7ra12287j

Cited by 4 publications

(3 citation statements)

References 35 publications

(21 reference statements)

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“…The peak within the dissipation factor curve over 100°C was correlated to the fact that the fraction of PS was larger than PVME (mass ratio of 3 : 1). And according to our previous NMR work, the rigid component (PS part) in the blend did not become soft until the temperature was much larger than blend’ glass transition temperature T g [2k,4] . The DMA result here confirmed this conclusion again.…”

Section: Resultssupporting

confidence: 88%

“…Recently the effects of temperature on the interplay between dewetting and phase separation, film thickness and composition ratio on the morphology evolution of PS/PVME blend thin films were investigated by Moghaddam and Xia et al respectively [2a,b] . The effect of the interaction between PS and PVME on the glass transition process of the blend at the micro‐level and phase structure and dynamics of PS/PVME blend were investigated using the FTIR and solid state NMR respectively by our group [2k,l] …”

Section: Introductionmentioning

confidence: 99%

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On the Dynamic Mechanical Behavior and Importance of Weak Interactions in PS/PVME Blends

2020

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In this work, the dynamic mechanical behavior and weak interactions in a miscible blend of polystyrene/poly (vinyl methyl ether) (PS/PVME) with a mass ratio of 3 : 1 (PS/PVME 75/25) were studied using DMA detection and solid‐state NMR methods. The results showed the miscibility of the blend and the evidence of the weak C−H to O hydrogen bonding between the aromatic H in PS and O of the methoxyl group in PVME. The 1H‐13C correlation spectrum indicated the diffusion time between 13C in OCH/OCH3 of PVME and Aromatic 1H of PS was at about millisecond level which confirmed the space affinity between the Aromatic 1H and OCH/OCH3 group in this mixture. Quantum calculations were made with four model systems in solutions by comparing the solvent toluene with CHCl3. In this way it was shown that the binding energy between PVME and CHCl3 was larger than the one between PVME and toluene, explaining why PVME and PS were miscible when using toluene as a solvent but not in CHCl3. The detailed components of the binding energy between PVME and solvent molecules were also analyzed with different methods which showed the similar result. These results reported here allows opportunities for finding new blend dependent on this kind of weak interaction or design of special polymers to enhance such weak interactions.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

On the Dynamic Mechanical Behavior and Importance of Weak Interactions in PS/PVME Blends

2020

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“…[25][26][27] Recently, a dynamic percolated network structure indicated the beginning of the glass transition process, which was conrmed by several experimental results and theoretical simulation studies. [28][29][30][31] Subsequently, several glass transition theories were built based on this signicant experimental result, including the twinkling fractal theory by Wool et al 32,33 and the conguron percolation theory by Ojovan et al 22 Actually, the introduction of the concept of percolation into the explanation of the vitrication process has a long history. The earliest idea of using percolation to explain the glass transition may come from Cohen and Grest.…”

Section: Introductionmentioning

confidence: 99%