Effects of molecular entanglement on molecular dynamics and phase-separation kinetics of poly(methyl methacrylate)/poly(styrene-co-maleic anhydride) blends

Lin, Yu; Shangguan, Yonggang; Zuo, Min; Harkin‐Jones, Eileen; Zheng, Qiang

doi:10.1016/j.polymer.2012.01.039

Cited by 29 publications

(29 citation statements)

References 55 publications

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“…A crossover frequency ω x ( G ′ = G ″) occurs when ω increases to a certain value. The crossover frequency is a typical indication of the beginning of the elastic plateau, and polymers with a lower crossover value indicate a higher elastic contribution to viscoelastic properties (Lin et al ., ; Shao et al ., ). Figure a, b shows that the crossover point of potato starch dispersion is obviously less than that of sweet potato starch dispersion, indicating the presence of higher entanglement density and weaker mobility of the chain segments in potato starch due to the lower crossover (Wu et al ., ).…”

Section: Resultsmentioning

confidence: 99%

“…Dynamic viscoelasticity was carried out according to previous methods with minor modifications (Wu et al, 2009;Lin et al, 2012). The potato and sweet potato starch dispersions with different concentrations around c e (0.1-2.0%) were heated in a boiling water bath with stirring magnetically for 30 min and then cooled to 60°C immediately used for rheological measurements.…”

Section: Dynamic Viscoelasticity Measurementsmentioning

confidence: 99%

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The relationship between entanglement concentration and physicochemical properties of potato and sweet potato starch dispersions

Cui

2017

Int J of Food Sci Tech

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Summary Entanglement concentration (ce) is defined as the onset of overlap and interpenetration of random‐coil chains in a polymer solution and is important in determining rheological, dynamic and fracture properties. However, few studies have reported in detail how ce influences physicochemical properties of starch dispersions. So, the effects of ce on the physicochemical properties of the potato and sweet potato starch dilute and semi‐dilute dispersions were investigated. The results showed that for the two starch dispersions with concentrations ≥ce, the gelatinisation temperature increased more significantly with increasing concentrations, and storage modulus increased faster than loss modulus with increasing frequency. The potato starch dispersion with concentrations ≥ce possessed higher entanglement density of the chain segments. The two starch dispersions with concentrations >ce exhibited shear thinning with increasing frequency. The two starches could only form film at concentrations ≥ce. So, ce will be a suitable concentration for regulating the concentration of starch dispersions to obtain the expected physicochemical properties.

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Section: Resultsmentioning

confidence: 99%

Section: Dynamic Viscoelasticity Measurementsmentioning

confidence: 99%

The relationship between entanglement concentration and physicochemical properties of potato and sweet potato starch dispersions

Cui

2017

Int J of Food Sci Tech

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“… Time evolution of ln( I − I s ) for PMMA/SMA 80/20 blend at various q during the early stage of phase separation at 215 °C …”

Section: Resultsmentioning

confidence: 99%

“…The resultant film samples with thickness of about 20 µm were homogeneous and optically transparent. T g of PMMA/SMA 80/20 and 60/40 blends were 105.4 and 112.1 °C, as measured using dielectric spectroscopy, respectively …”

Section: Methodsmentioning

confidence: 97%

Nonlinear phase‐separation behavior of poly(methyl methacrylate)/poly(styrene‐co‐maleic anhydride) blends

Lin

Shangguan

Chen

et al. 2012

Polymer International

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The nonlinear phase‐separation behavior of poly(methyl methacrylate)/poly(styrene‐co‐maleic anhydride) (PMMA/SMA) blends over wide appropriate temperature and heating rate ranges was studied using time‐resolved small‐angle laser light scattering. During the non‐isothermal process, a quantitative logarithm function was established to describe the relationship between cloud point (Tc) and heating rate (k) as given by Tc = Alnk + T0, in which the parameter A, reflecting the heating rate dependence, is much different for different compositions due to phase‐separation rate and activation energy difference. For the isothermal phase‐separation process, an Arrhenius‐like equation was successfully applied to describe the temperature dependence of the apparent diffusion coefficient (Dapp) and the relaxation time (τ) of the early stage as well as the late stage of spinodal decomposition (SD) of PMMA/SMA blends. Based on the successful application of the Arrhenius‐like equation, the related activation energies could be obtained from Dapp and τ of the early and late stages of SD, respectively. In addition, these results indicate that it is possible to predict the temperature dependence of the phase‐separation behavior of binary polymer mixtures during isothermal annealing over a range of 100 °C above the glass transition temperature using the Arrhenius‐like equation. © 2012 Society of Chemical Industry

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“…The result suggested that the EBPFOA could initiate monomer TPGDA photopolymerization on the surface of the PAN nanofiber. The XPS spectra and SEM images showed that the core-shell nanofiber structure could be obtained via the combination of electrospinning and photopolymerization [32][33][34].…”

Section: Resultsmentioning

confidence: 99%

Potential fabrication of core–shell electrospun nanofibers from a two-step method: Electrospinning and photopolymerization

Niu

Nie

et al. 2016

Journal of Industrial and Engineering Chemistry

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Effects of molecular entanglement on molecular dynamics and phase-separation kinetics of poly(methyl methacrylate)/poly(styrene-co-maleic anhydride) blends

Cited by 29 publications

References 55 publications

The relationship between entanglement concentration and physicochemical properties of potato and sweet potato starch dispersions

The relationship between entanglement concentration and physicochemical properties of potato and sweet potato starch dispersions

Nonlinear phase‐separation behavior of poly(methyl methacrylate)/poly(styrene‐co‐maleic anhydride) blends

Potential fabrication of core–shell electrospun nanofibers from a two-step method: Electrospinning and photopolymerization

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