Heat capacity measurements and modeling of polystyrene glass transition in a wide range of cooling rates

Тропин, Т. В.; Schulz, Gunnar; Schmelzer, Jürn W. P.; Schick, Christoph

doi:10.1016/j.jnoncrysol.2014.11.001

Cited by 44 publications

(21 citation statements)

References 65 publications

(134 reference statements)

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“…During all measurements, the chip was constantly flushed with dry nitrogen gas. The glass transition of amorphous PA66 is expected at around 333 K at 5000 Ks 1 [1,[25][26][27]. In this work, heating was performed from room temperature; therefore, we cannot observe the relatively broad glass transition step fully.…”

Section: Methodsmentioning

confidence: 84%

Fingerprints of homogeneous nucleation and crystal growth in polyamide 66 as studied by combined infrared spectroscopy and fast scanning chip calorimetry

et al. 2020

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Homogenous crystal nucleation and growth in polyamide 66 (PA66) are followed in situ by means of a combination of FTIR spectroscopy and fast scanning chip calorimetry (FSC). Therefore, a novel setup with a calorimetry chip equipped with an IRtransparent SiN membrane was developed, which enables to examine IR spectroscopic and FSC experiments on the identical specimen. Because of the small amount of sample material (~100 ng), it is possible to achieve heating and cooling rates up to 5000 Ks −1 , and hence to quench the sample into a fully amorphous state without quenched-in homogeneous crystal nuclei. Annealing the film then allows to determine the onset of homogenous nucleation and crystal growth by means of FSC, whereas molecular interactions are unraveled by FTIR spectroscopy. It is demonstrated that different moieties of PA66 respond distinctly during crystallization; far-reaching interactions such as hydrogen bonding are established prior to onset of short-range steric hindrance.

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Section: Methodsmentioning

confidence: 84%

Fingerprints of homogeneous nucleation and crystal growth in polyamide 66 as studied by combined infrared spectroscopy and fast scanning chip calorimetry

et al. 2020

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“…In a more recent study, the relationship between the cooling rate and T f were also investigated with a polystyrene sample. In the paper, Tropin et al 27 reported their work on heat capacity relaxation of polystyrene with a wide range of cooling rates and obtained a correlation between the cooling rate and T f , as replicated in from Arrhenius behavior. 29 The quantitative parameter used to measure fragility is called the steepness index m, which is defined as, 30…”

mentioning

confidence: 94%

“…This conclusion is consistent with our derived equation of x (eq (10)), and contradictory to the original one by Hodge (eq (6)). Furthermore, more detailed research on the relaxation of standard polystyrene samples has been reported, 26,27 Liu et al…”

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confidence: 99%

Revising the formulization of the Narayanaswamy equation using the Adam-Gibbs theory

Phalen

Cousins

Usher

et al. 2016

Journal of Non-Crystalline Solids

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Hodge's formulization of the Tool-Narayanaswamy-Moynihan (TNM) equation from the Adam-Gibbs (AG) theory was re-evaluated. The non-linearity parameter (x) and the apparent activation energy (∆h*) of the TMN equation were re-derived. Compared with the original derivations, the revised values of x and ∆h* were better correlated with experimental results. Of particular importance, the revised theoretical x correctly predicts the experimental trend of x for the cooling rate of polystyrene, whereas the original derivation predicted an opposite trend. Furthermore, the new derivation establishes a strong relationship between the fragility coefficient (m) and the x of a material. The relationship correlates well with the experimental values for a wide range of

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“…In the past decades, nanoparticles have received increasing interest owing to its unique structural and surface properties. There are many nanoparticles have been applied to improve the performances of rubber, such as graphene [5][6][7][8], layered double hydroxide [9,10], nano silica [11], carbon nano tubes [12], montmorillonite [13,14], ect. The properties of nanocomposites are better than that of conventional composites in the same composition due to the quantum effect and surface effect caused by the small…”

Section: Introductionmentioning

confidence: 99%

Effect of Graphene Oxide Modified with Organic Amine on the Aging Resistance, Rolling Loss and Wet-Skid Resistance of Solution Polymerized Styrene-Butadiene Rubber

Wan

Zhao³

et al. 2020

Materials

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Graphene oxide (GO) was modified by p-phenylenediamine (PPD), aiming at improving the wet-skid resistance and reduce the rolling loss of solution polymerized styrene-butadiene rubber (SSBR). PPD with amino groups enabled GO to obtain anti-aging function. The structure of modified GO (PPD-GO) was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Raman spectroscopy. Mechanical tests showed that the mechanical properties of SSBR before and after aging were improved by adding PPD-GO. The results of thermogravimetric-differential scanning calorimeter synchronization analysis (TGA-DSC) indicated that SSBR/PPD-GO obtained good thermo-oxidative stability. The dynamic mechanical analysis (DMA) of SSBR composites showed that the mechanical loss factor (tanδ) peak moved to high temperature with the content of PPD-GO. The tanδ values of SSBR composites showed that it had a good effect on improving the wet-skid resistance and reducing the rolling loss of SSBR by adjusting the content of PPD-GO. In particular, with the addition of 4 phr GO, SSBR was effectively improved in mechanical properties, aging resistance, wet-skid resistance and low rolling loss.

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Heat capacity measurements and modeling of polystyrene glass transition in a wide range of cooling rates

Cited by 44 publications

References 65 publications

Fingerprints of homogeneous nucleation and crystal growth in polyamide 66 as studied by combined infrared spectroscopy and fast scanning chip calorimetry

Fingerprints of homogeneous nucleation and crystal growth in polyamide 66 as studied by combined infrared spectroscopy and fast scanning chip calorimetry

Revising the formulization of the Narayanaswamy equation using the Adam-Gibbs theory

Effect of Graphene Oxide Modified with Organic Amine on the Aging Resistance, Rolling Loss and Wet-Skid Resistance of Solution Polymerized Styrene-Butadiene Rubber

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