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Differential scanning calorimetry

About: Differential scanning calorimetry is a research topic. Over the lifetime, 50315 publications have been published within this topic receiving 1152335 citations. The topic is also known as: DSC.


Papers
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Journal ArticleDOI
01 Nov 1999-Polymer
TL;DR: The high thermal stability of polybenzoxazines is a combined result of polymerization of acetylene terminal functional group and oxazine ring-opening polymerization as mentioned in this paper, and the high char yield achieved for this class of materials is in the range of 71-81% by weight at 800°C in a nitrogen atmosphere and 30% at 700°c in air as it is determined by thermogravimetric analysis.

248 citations

Journal ArticleDOI
TL;DR: In this article, carboxylated polymers of intrinsic microporosity (carboxyl-ated PIMs) are reported as potential high-performance materials for membrane-based gas separation.
Abstract: Carboxylated polymers of intrinsic microporosity (carboxylated PIMs) are reported as potential high-performance materials for membrane-based gas separation Carboxylated PIM membranes were prepared by in situ hydrolysis of the nitrile groups of PIM-1 films Structural characterization was performed by Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H NMR) The degree of hydrolysis was determined by carbon elemental analysis The thermal properties were evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) Compared with PIM-1, carboxylated PIMs with different degrees of hydrolysis have similar thermal and mechanical properties but show higher selectivity for gas pairs such as O2/N2, CO2/N2, He/N2, and H2/N2 with a corresponding decrease in permeability Selectivity coupled to high permeability combines to exceed the Robeson upper-bound line for the O2/N2 gas pair This work demonstrates that significant improvements in gas separati

248 citations

Journal ArticleDOI
TL;DR: In this article, conditions for the synthesis of polymers with respect to reaction time and yield were studied with a number of monomers at different concentrations and in solvents with different buffers with pH range of 5.0-7.5.
Abstract: Polymers were synthesized from substituted phenolic and aromatic amine compounds with hydrogen peroxide as the source of an oxidizing agent and horseradish peroxidase enzyme as the catalyst. The polymerization reaction was carried out in a monophasic organic solvent with small amounts of water at room temperature. Conditions for the synthesis of polymers with respect to reaction time and yield were studied with a number of monomers at different concentrations and in solvents with different buffers with pH range of 5.0–7.5. Physical and chemical properties of these homo-and copolymers were determined with respect to melting point, solubility, elemental analysis, molecular weight distribution, infrared absorption (including FTIR), solid-state 13C nuclear magnetic resonance, thermal gravimetric analysis, and differential scanning calorimetry. The enzyme catalyzed reactions produced polymers of molecular weight greater than 400,000 which were further fractionated by differential solubility in solvent mixtures and the molecular weight distribution of the polymer fractions were determined. In general, the polymers synthesized have low solubilities, high melting points, and some degree of branching.

247 citations

Journal ArticleDOI
TL;DR: In this paper, a series of sepiolites, palygorskites and rML clay minerals have been analyzed by controlled rate thermal analysis and differential scanning calorimetry (DSC).

247 citations

Journal ArticleDOI
TL;DR: In this article, a mixture of polyvinyl alcohol (PVA) and hydroxypropyl cellulose (HPC) was used as bio-equivalent materials for thermal analysis.
Abstract: Polymers and polymeric composites have steadily reflected their importance in our daily life. Blending poly(vinyl alcohol) (PVA) with a potentially useful natural biopolymers such as hydroxypropyl cellulose (HPC) seems to be an interesting way of preparing a polymeric blends. In the present work, blends of PVA/HPC of compositions (100/0, 90/10, 75/25, 50/50, 25/75, and 0/100 wt/wt%) were prepared to be used as bioequivalent materials. Thermal analyses [differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA)], and X-ray diffraction (XRD) were employed to characterize and reveal the miscibility map and the structural properties of such blend system. The obtained results of the thermal analyses showed variations in the glass transition temperature (Tg) indicating the miscibility of the blend systems. Moreover, the changes in the melting temperature (Tm), shape and area were attributed to the different degrees of crystallinity and the existence of polymer-polymer interactions between PVA and HPC molecules. The X-ray diffraction (XRD) analysis showed broadening and sharpening of peaks at different HPC concentrations with PVA. This indicated changes in the crystallinity/amorphosity ratio, and also suggested that the miscibility between the amorphous components of homo-polymers PVA and HPC is possible. The results showed that HPC doped in PVA film can improve the thermal stability of the film under investigation, leading to interesting technological applications.

247 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,992
20224,368
20211,646
20201,696
20191,799
20181,990