Compositional Variation of Glass-Transition Temperature in Miscible Polymer Blends Involving Weak and Strong Specific Interactions

Múgica, Agurtzane; Calahorra, M. E.; Cortázar, M.

doi:10.1002/1521-3935(20020501)203:8<1088::aid-macp1088>3.0.co;2-u

Cited by 16 publications

(7 citation statements)

References 32 publications

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“…Studies have shown that addition of hindered amine or hindered phenol small molecules, such as N , N ′‐dicyclohexyl‐benzothiazyl‐2‐sulfenamide or 3,9‐bis{2‐[3‐(3‐tert‐butyl‐4‐hydroxy‐5‐methylphenyl)propionyloxy‐1,1‐dimethyl‐ethyl]‐2,4,8,10‐tetraoxaspiro[5,5]undecane} (AO80), can greatly increase the peak height of tan δ because of internal friction between the polymer and small molecules and reversible hydrogen bond interaction in the blends, which consumes a large amount of mechanical energy to improve the damping performance of the resultant materials . The glass transition temperatures ( T g ) of hybrid materials can also be adjusted by changing the composition of the blends or regulating their intermolecular interactions to accommodate application condition . Therefore, determination of the properties of small molecules as well as interactions between the polymer and small molecules, which exert significant influences on the damping performance of the materials, is worthy of discussion.…”

Section: Introductionmentioning

confidence: 99%

“…8,13 The glass transition temperatures (T g ) of hybrid materials can also be adjusted by changing the composition of the blends or regulating their intermolecular interactions to accommodate application condition. 14,15 Therefore, determination of the properties of small molecules as well as interactions between the polymer and small molecules, which exert significant influences on the damping performance of the materials, is worthy of discussion.…”

Section: Introductionmentioning

confidence: 99%

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Influence of hydrogen bonding interaction on the damping properties of poly(n‐butyl methacrylate)/small molecule hybrids

Yin

Liu

Lin

et al. 2015

J of Applied Polymer Sci

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The hydrogen bonding interactions between poly(n‐butyl methacrylate) and a series of low molecular weight phenols containing two to four hydroxyl groups with different steric effects were investigated by differential scanning calorimetry and Fourier‐transform infrared spectroscopy. Results showed that the hydrogen bonding strength between the two components varies greatly according to the steric effects of the phenolic hydroxyl group. As the size of the group beside the hydroxyl increases, the hydrogen bond strength weakens. The glass transition temperature of binary hybrid systems was put into relation with the corresponding hydrogen bonding interaction strength. Strong hydrogen bonding strength increased Tg to higher values than that predicted by the linear additivity rule; by contrast, Tg of hybrid systems with weak hydrogen bonds showed linear changes. All of the samples showed linear variations at low concentrations of small molecules. The damping properties of five systems were analyzed by dynamic mechanical analysis. Either the loss factor or area of tan δ peak of the five systems increased compared with that of the pure polymer, thereby showing great improvements in the damping properties of the poly(n‐butyl methacrylate)/small molecule hybrid material. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41954.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of hydrogen bonding interaction on the damping properties of poly(n‐butyl methacrylate)/small molecule hybrids

Yin

Liu

Lin

et al. 2015

J of Applied Polymer Sci

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“…5 and 6 for the MMT vs. MOT mixtures. This is the typical feature driven by mixing entropy 29 45 . According to the Adam-Gibbs' configurational entropy ( S c ) theory 46 , τ ( T ) = τ 0 exp(Δ μC AG / TS c ), where τ 0 is the pre-exponent having the phonon time, Δ μ is potential barrier hindering molecular rearrangement, and C AG is a constant 47 48 49 , if the intermolecular interaction keeps unchanged (Δ H mix = 0), the variation in Δ μ is negligible, and the increase in S c during mixing at a fixed temperature would correspond to a decrease in τ ( T ), which makes the relaxation time curves move toward low temperature regions in activation plots (log τ ( T ) vs. 1/ T ), and finally leads to a decrease in T g-kin (or T τ = 100 s ).…”

Section: Discussionmentioning

confidence: 93%

Unveiling the Dependence of Glass Transitions on Mixing Thermodynamics in Miscible Systems

Yun-xi

et al. 2015

Sci Rep

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The dependence of the glass transition in mixtures on mixing thermodynamics is examined by focusing on enthalpy of mixing, ΔHmix with the change in sign (positive vs. negative) and magnitude (small vs. large). The effects of positive and negative ΔHmix are demonstrated based on two isomeric systems of o- vs. m- methoxymethylbenzene (MMB) and o- vs. m- dibromobenzene (DBB) with comparably small absolute ΔHmix. Two opposite composition dependences of the glass transition temperature, Tg, are observed with the MMB mixtures showing a distinct negative deviation from the ideal mixing rule and the DBB mixtures having a marginally positive deviation. The system of 1, 2- propanediamine (12PDA) vs. propylene glycol (PG) with large and negative ΔHmix is compared with the systems of small ΔHmix, and a considerably positive Tg shift is seen. Models involving the properties of pure components such as Tg, glass transition heat capacity increment, ΔCp, and density, ρ, do not interpret the observed Tg shifts in the systems. In contrast, a linear correlation is revealed between ΔHmix and maximum Tg shifts.

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“…The deviation of T g from the ideal mixing law has been argued to be a consequence of the balance of enthalpic and entropic factors, 36,67 and in systems of strong intermolecular interactions with large and negative DH mix , the positive T g deviations from the ideal mixing mode are favored, 14,26,68 while the negative T g deviation is associated with the positive DH mix . 26,36 The systems with negative T g deviations are also categorized to have an entropic character in the mixture, showing that a positive entropy of mixing has the effect of shifting T g to a lower value.…”

Section: Discussionmentioning

confidence: 99%

Glass transition and mixing thermodynamics of a binary eutectic system

Chen

Gao

et al. 2014

Phys. Chem. Chem. Phys.

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A quantitative evaluation of the contribution of mixing thermodynamics to glass transition is performed for a binary eutectic benzil and m-nitroaniline system. The microcalorimetric measurements of the enthalpy of mixing give small and positive values, typically ~200 J mol(-1) for the equimolar mixture. The composition dependence of the glass transition temperature, T(g), is found to show a large and negative deviation from the ideal mixing rule. The Gordon-Taylor and Couchman-Karasz models are subsequently applied to interpret the T(g) behavior, however, only a small fraction of the deviation is explained. The analyses of the experimental results manifest quantitatively the importance of the mixing thermodynamics in the glass transition in miscible systems.

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Compositional Variation of Glass-Transition Temperature in Miscible Polymer Blends Involving Weak and Strong Specific Interactions

Cited by 16 publications

References 32 publications

Influence of hydrogen bonding interaction on the damping properties of poly(n‐butyl methacrylate)/small molecule hybrids

Influence of hydrogen bonding interaction on the damping properties of poly(n‐butyl methacrylate)/small molecule hybrids

Unveiling the Dependence of Glass Transitions on Mixing Thermodynamics in Miscible Systems

Glass transition and mixing thermodynamics of a binary eutectic system

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