Modulated DSC as a tool for polyethylene structure characterization

Chau, J.; Garlicka, Iwona; Wolf, Catherine G.; Teh, Jiashen

doi:10.1007/s10973-007-8527-4

Cited by 18 publications

(3 citation statements)

References 7 publications

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“…This technique is a powerful new tool for more complete characterization of polymer systems by calorimetry. The major advantage of MDSC is its increased sensitivity to detect small transitions (Chau et al, 2007;Rahman et al, 2008). Perdon et al (2000) investigated three methods for the determination of T g : differential scanning calorimeter, thermomechanical and dynamic mechanical analyses, but selected thermomechanical analysis, because it also provided data on thermal volumetric coefficient.…”

Section: Introductionmentioning

confidence: 99%

Thermal transitions of rice: Development of a state diagram

Sablani

Bruno

Kasapis

et al. 2009

Journal of Food Engineering

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Section: Introductionmentioning

confidence: 99%

Thermal transitions of rice: Development of a state diagram

Sablani

Bruno

Kasapis

et al. 2009

Journal of Food Engineering

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“…Modulated heating–cooling cycles were performed under nitrogen flow in the temperature range from −173 to 448 K, with a heating/cooling rate of 3 K/min and a modulation amplitude of 0.5 K and a period of 60 s. The annealing time between cooling and heating runs was 5 min. MDSC allows separation of total heat flow signal to its reversing and nonreversing components . Glass transition temperature ( T g ) was determined at the inflection point of the reversing curve, and the heat of crystallization (Δ H c ) was estimated from the total heat flow curve during cooling.…”

Section: Methodsmentioning

confidence: 99%

“…MDSC allows separation of total heat flow signal to its reversing and nonreversing components 23 . 24 Glass transition temperature (T g ) was determined at the inflection point of the reversing curve, and the heat of crystallization (ΔH c ) was estimated from the total heat flow curve during cooling.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Study of the Dynamic Heterogeneity in Poly(ethylene-ran-vinyl acetate) Copolymer by Using Broadband Dielectric Spectroscopy and Electrostatic Force Microscopy

et al. 2013

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Dynamic heterogeneities in ethylene−vinyl acetate (EVA) random copolymers were studied using broadband dielectric spectroscopy (BDS) over a broad frequency and temperature range. BDS data for EVA copolymers show relatively broad spectra extending over several frequency decades, which make interpretation of the data complicated. Thus, microscopic dielectric characterizations of the samples were done using single pass electrostatic force microscopy (SP-EFM) images. From these experiments two distinct dielectric contributions were found in the semicrystalline samples. Dielectric spectra of EVA copolymers were fitted using a model based on the SP-EFM images. According to this analysis, the broad dielectric responses of semicrystalline EVA copolymers were constituted from two dielectrically active phases, referred to as the constrained and nonconstrained phases, exhibiting different segmental relaxations. In the constrained phase, vinyl acetate (VA) motions were greatly restricted by crystalline microstructures, whereas in the nonconstrained phase, VA monomers were assumed to be completely free from crystalline effect. The glass transition temperature derived from the dynamics of the VA segments in the constrained phase was found to correspond well with that determined from DSC representing the overall amorphous phase in the more crystallized state. Moreover, crystallinity of the sample obtained using DSC was found to follow a similar variation with temperature to that of the dielectric relaxation strength of the constrained phase of the copolymers. However, at the earlier stage of crystallization, where crystallinity increases rapidly, the dielectric relaxation remains insensitive to it.

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Thermal characteristics and regeneration analyses of adsorbents by differential scanning calorimetry and scanning electron microscope

Shen

Shiue

et al. 2009

J Therm Anal Calorim

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Modulated DSC as a tool for polyethylene structure characterization

Cited by 18 publications

References 7 publications

Thermal transitions of rice: Development of a state diagram

Thermal transitions of rice: Development of a state diagram

Study of the Dynamic Heterogeneity in Poly(ethylene-ran-vinyl acetate) Copolymer by Using Broadband Dielectric Spectroscopy and Electrostatic Force Microscopy

Thermal characteristics and regeneration analyses of adsorbents by differential scanning calorimetry and scanning electron microscope

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